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1 /* See LICENSE for license details. */
2 #include <ctype.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <limits.h>
6 #include <locale.h>
7 #include <pwd.h>
8 #include <stdarg.h>
9 #include <stdbool.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <signal.h>
14 #include <stdint.h>
15 #include <sys/ioctl.h>
16 #include <sys/select.h>
17 #include <sys/stat.h>
18 #include <sys/time.h>
19 #include <sys/types.h>
20 #include <sys/wait.h>
21 #include <time.h>
22 #include <unistd.h>
23 #include <libgen.h>
24 #include <X11/Xatom.h>
25 #include <X11/Xlib.h>
26 #include <X11/Xutil.h>
27 #include <X11/cursorfont.h>
28 #include <X11/keysym.h>
29 #include <X11/Xft/Xft.h>
30 #include <X11/XKBlib.h>
31 #include <fontconfig/fontconfig.h>
32 #include <wchar.h>
33
34 #include "arg.h"
35
36 char *argv0;
37
38 #define Glyph Glyph_
39 #define Font Font_
40
41 #if   defined(__linux)
42  #include <pty.h>
43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
44  #include <util.h>
45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
46  #include <libutil.h>
47 #endif
48
49
50 /* XEMBED messages */
51 #define XEMBED_FOCUS_IN  4
52 #define XEMBED_FOCUS_OUT 5
53
54 /* Arbitrary sizes */
55 #define UTF_INVALID   0xFFFD
56 #define UTF_SIZ       4
57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
58 #define ESC_ARG_SIZ   16
59 #define STR_BUF_SIZ   ESC_BUF_SIZ
60 #define STR_ARG_SIZ   ESC_ARG_SIZ
61 #define DRAW_BUF_SIZ  20*1024
62 #define XK_ANY_MOD    UINT_MAX
63 #define XK_NO_MOD     0
64 #define XK_SWITCH_MOD (1<<13)
65
66 /* macros */
67 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
68 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
69 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
70 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
71 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
72 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
73 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
74 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
80
81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
82 #define IS_TRUECOL(x)    (1 << 24 & (x))
83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
84 #define TRUEGREEN(x)     (((x) & 0xff00))
85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
86
87
88 enum glyph_attribute {
89         ATTR_NULL      = 0,
90         ATTR_BOLD      = 1 << 0,
91         ATTR_FAINT     = 1 << 1,
92         ATTR_ITALIC    = 1 << 2,
93         ATTR_UNDERLINE = 1 << 3,
94         ATTR_BLINK     = 1 << 4,
95         ATTR_REVERSE   = 1 << 5,
96         ATTR_INVISIBLE = 1 << 6,
97         ATTR_STRUCK    = 1 << 7,
98         ATTR_WRAP      = 1 << 8,
99         ATTR_WIDE      = 1 << 9,
100         ATTR_WDUMMY    = 1 << 10,
101 };
102
103 enum cursor_movement {
104         CURSOR_SAVE,
105         CURSOR_LOAD
106 };
107
108 enum cursor_state {
109         CURSOR_DEFAULT  = 0,
110         CURSOR_WRAPNEXT = 1,
111         CURSOR_ORIGIN   = 2
112 };
113
114 enum term_mode {
115         MODE_WRAP        = 1 << 0,
116         MODE_INSERT      = 1 << 1,
117         MODE_APPKEYPAD   = 1 << 2,
118         MODE_ALTSCREEN   = 1 << 3,
119         MODE_CRLF        = 1 << 4,
120         MODE_MOUSEBTN    = 1 << 5,
121         MODE_MOUSEMOTION = 1 << 6,
122         MODE_REVERSE     = 1 << 7,
123         MODE_KBDLOCK     = 1 << 8,
124         MODE_HIDE        = 1 << 9,
125         MODE_ECHO        = 1 << 10,
126         MODE_APPCURSOR   = 1 << 11,
127         MODE_MOUSESGR    = 1 << 12,
128         MODE_8BIT        = 1 << 13,
129         MODE_BLINK       = 1 << 14,
130         MODE_FBLINK      = 1 << 15,
131         MODE_FOCUS       = 1 << 16,
132         MODE_MOUSEX10    = 1 << 17,
133         MODE_MOUSEMANY   = 1 << 18,
134         MODE_BRCKTPASTE  = 1 << 19,
135         MODE_PRINT       = 1 << 20,
136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
137                           |MODE_MOUSEMANY,
138 };
139
140 enum charset {
141         CS_GRAPHIC0,
142         CS_GRAPHIC1,
143         CS_UK,
144         CS_USA,
145         CS_MULTI,
146         CS_GER,
147         CS_FIN
148 };
149
150 enum escape_state {
151         ESC_START      = 1,
152         ESC_CSI        = 2,
153         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
154         ESC_ALTCHARSET = 8,
155         ESC_STR_END    = 16, /* a final string was encountered */
156         ESC_TEST       = 32, /* Enter in test mode */
157 };
158
159 enum window_state {
160         WIN_VISIBLE = 1,
161         WIN_REDRAW  = 2,
162         WIN_FOCUSED = 4
163 };
164
165 enum selection_type {
166         SEL_REGULAR = 1,
167         SEL_RECTANGULAR = 2
168 };
169
170 enum selection_snap {
171         SNAP_WORD = 1,
172         SNAP_LINE = 2
173 };
174
175 typedef unsigned char uchar;
176 typedef unsigned int uint;
177 typedef unsigned long ulong;
178 typedef unsigned short ushort;
179
180 typedef XftDraw *Draw;
181 typedef XftColor Color;
182
183 typedef struct {
184         char c[UTF_SIZ]; /* character code */
185         ushort mode;      /* attribute flags */
186         uint32_t fg;      /* foreground  */
187         uint32_t bg;      /* background  */
188 } Glyph;
189
190 typedef Glyph *Line;
191
192 typedef struct {
193         Glyph attr; /* current char attributes */
194         int x;
195         int y;
196         char state;
197 } TCursor;
198
199 /* CSI Escape sequence structs */
200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
201 typedef struct {
202         char buf[ESC_BUF_SIZ]; /* raw string */
203         int len;               /* raw string length */
204         char priv;
205         int arg[ESC_ARG_SIZ];
206         int narg;              /* nb of args */
207         char mode[2];
208 } CSIEscape;
209
210 /* STR Escape sequence structs */
211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
212 typedef struct {
213         char type;             /* ESC type ... */
214         char buf[STR_BUF_SIZ]; /* raw string */
215         int len;               /* raw string length */
216         char *args[STR_ARG_SIZ];
217         int narg;              /* nb of args */
218 } STREscape;
219
220 /* Internal representation of the screen */
221 typedef struct {
222         int row;      /* nb row */
223         int col;      /* nb col */
224         Line *line;   /* screen */
225         Line *alt;    /* alternate screen */
226         bool *dirty;  /* dirtyness of lines */
227         TCursor c;    /* cursor */
228         int top;      /* top    scroll limit */
229         int bot;      /* bottom scroll limit */
230         int mode;     /* terminal mode flags */
231         int esc;      /* escape state flags */
232         char trantbl[4]; /* charset table translation */
233         int charset;  /* current charset */
234         int icharset; /* selected charset for sequence */
235         bool numlock; /* lock numbers in keyboard */
236         bool *tabs;
237 } Term;
238
239 /* Purely graphic info */
240 typedef struct {
241         Display *dpy;
242         Colormap cmap;
243         Window win;
244         Drawable buf;
245         Atom xembed, wmdeletewin, netwmname, netwmpid;
246         XIM xim;
247         XIC xic;
248         Draw draw;
249         Visual *vis;
250         XSetWindowAttributes attrs;
251         int scr;
252         bool isfixed; /* is fixed geometry? */
253         int l, t; /* left and top offset */
254         int gm; /* geometry mask */
255         int tw, th; /* tty width and height */
256         int w, h; /* window width and height */
257         int ch; /* char height */
258         int cw; /* char width  */
259         char state; /* focus, redraw, visible */
260         int cursor; /* cursor style */
261 } XWindow;
262
263 typedef struct {
264         uint b;
265         uint mask;
266         char *s;
267 } Mousekey;
268
269 typedef struct {
270         KeySym k;
271         uint mask;
272         char *s;
273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
274         signed char appkey;    /* application keypad */
275         signed char appcursor; /* application cursor */
276         signed char crlf;      /* crlf mode          */
277 } Key;
278
279 typedef struct {
280         int mode;
281         int type;
282         int snap;
283         /*
284          * Selection variables:
285          * nb – normalized coordinates of the beginning of the selection
286          * ne – normalized coordinates of the end of the selection
287          * ob – original coordinates of the beginning of the selection
288          * oe – original coordinates of the end of the selection
289          */
290         struct {
291                 int x, y;
292         } nb, ne, ob, oe;
293
294         char *primary, *clipboard;
295         Atom xtarget;
296         bool alt;
297         struct timespec tclick1;
298         struct timespec tclick2;
299 } Selection;
300
301 typedef union {
302         int i;
303         uint ui;
304         float f;
305         const void *v;
306 } Arg;
307
308 typedef struct {
309         uint mod;
310         KeySym keysym;
311         void (*func)(const Arg *);
312         const Arg arg;
313 } Shortcut;
314
315 /* function definitions used in config.h */
316 static void clipcopy(const Arg *);
317 static void clippaste(const Arg *);
318 static void numlock(const Arg *);
319 static void selpaste(const Arg *);
320 static void xzoom(const Arg *);
321 static void xzoomabs(const Arg *);
322 static void xzoomreset(const Arg *);
323 static void printsel(const Arg *);
324 static void printscreen(const Arg *) ;
325 static void toggleprinter(const Arg *);
326
327 /* Config.h for applying patches and the configuration. */
328 #include "config.h"
329
330 /* Font structure */
331 typedef struct {
332         int height;
333         int width;
334         int ascent;
335         int descent;
336         short lbearing;
337         short rbearing;
338         XftFont *match;
339         FcFontSet *set;
340         FcPattern *pattern;
341 } Font;
342
343 /* Drawing Context */
344 typedef struct {
345         Color col[MAX(LEN(colorname), 256)];
346         Font font, bfont, ifont, ibfont;
347         GC gc;
348 } DC;
349
350 static void die(const char *, ...);
351 static void draw(void);
352 static void redraw(void);
353 static void drawregion(int, int, int, int);
354 static void execsh(void);
355 static void sigchld(int);
356 static void run(void);
357
358 static void csidump(void);
359 static void csihandle(void);
360 static void csiparse(void);
361 static void csireset(void);
362 static int eschandle(uchar);
363 static void strdump(void);
364 static void strhandle(void);
365 static void strparse(void);
366 static void strreset(void);
367
368 static int tattrset(int);
369 static void tprinter(char *, size_t);
370 static void tdumpsel(void);
371 static void tdumpline(int);
372 static void tdump(void);
373 static void tclearregion(int, int, int, int);
374 static void tcursor(int);
375 static void tdeletechar(int);
376 static void tdeleteline(int);
377 static void tinsertblank(int);
378 static void tinsertblankline(int);
379 static int tlinelen(int);
380 static void tmoveto(int, int);
381 static void tmoveato(int, int);
382 static void tnew(int, int);
383 static void tnewline(int);
384 static void tputtab(int);
385 static void tputc(char *, int);
386 static void treset(void);
387 static void tresize(int, int);
388 static void tscrollup(int, int);
389 static void tscrolldown(int, int);
390 static void tsetattr(int *, int);
391 static void tsetchar(char *, Glyph *, int, int);
392 static void tsetscroll(int, int);
393 static void tswapscreen(void);
394 static void tsetdirt(int, int);
395 static void tsetdirtattr(int);
396 static void tsetmode(bool, bool, int *, int);
397 static void tfulldirt(void);
398 static void techo(char *, int);
399 static void tcontrolcode(uchar );
400 static void tdectest(char );
401 static int32_t tdefcolor(int *, int *, int);
402 static void tdeftran(char);
403 static inline bool match(uint, uint);
404 static void ttynew(void);
405 static void ttyread(void);
406 static void ttyresize(void);
407 static void ttysend(char *, size_t);
408 static void ttywrite(const char *, size_t);
409 static void tstrsequence(uchar);
410
411 static inline ushort sixd_to_16bit(int);
412 static void xdraws(char *, Glyph, int, int, int, int);
413 static void xhints(void);
414 static void xclear(int, int, int, int);
415 static void xdrawcursor(void);
416 static void xinit(void);
417 static void xloadcols(void);
418 static int xsetcolorname(int, const char *);
419 static int xgeommasktogravity(int);
420 static int xloadfont(Font *, FcPattern *);
421 static void xloadfonts(char *, double);
422 static void xsettitle(char *);
423 static void xresettitle(void);
424 static void xsetpointermotion(int);
425 static void xseturgency(int);
426 static void xsetsel(char *);
427 static void xtermclear(int, int, int, int);
428 static void xunloadfont(Font *);
429 static void xunloadfonts(void);
430 static void xresize(int, int);
431
432 static void expose(XEvent *);
433 static void visibility(XEvent *);
434 static void unmap(XEvent *);
435 static char *kmap(KeySym, uint);
436 static void kpress(XEvent *);
437 static void cmessage(XEvent *);
438 static void cresize(int, int);
439 static void resize(XEvent *);
440 static void focus(XEvent *);
441 static void brelease(XEvent *);
442 static void bpress(XEvent *);
443 static void bmotion(XEvent *);
444 static void selnotify(XEvent *);
445 static void selclear(XEvent *);
446 static void selrequest(XEvent *);
447
448 static void selinit(void);
449 static void selnormalize(void);
450 static inline bool selected(int, int);
451 static char *getsel(void);
452 static void selcopy(void);
453 static void selscroll(int, int);
454 static void selsnap(int, int *, int *, int);
455 static int x2col(int);
456 static int y2row(int);
457 static void getbuttoninfo(XEvent *);
458 static void mousereport(XEvent *);
459
460 static size_t utf8decode(char *, long *, size_t);
461 static long utf8decodebyte(char, size_t *);
462 static size_t utf8encode(long, char *, size_t);
463 static char utf8encodebyte(long, size_t);
464 static size_t utf8len(char *);
465 static size_t utf8validate(long *, size_t);
466
467 static ssize_t xwrite(int, const char *, size_t);
468 static void *xmalloc(size_t);
469 static void *xrealloc(void *, size_t);
470 static char *xstrdup(char *);
471
472 static void usage(void);
473
474 static void (*handler[LASTEvent])(XEvent *) = {
475         [KeyPress] = kpress,
476         [ClientMessage] = cmessage,
477         [ConfigureNotify] = resize,
478         [VisibilityNotify] = visibility,
479         [UnmapNotify] = unmap,
480         [Expose] = expose,
481         [FocusIn] = focus,
482         [FocusOut] = focus,
483         [MotionNotify] = bmotion,
484         [ButtonPress] = bpress,
485         [ButtonRelease] = brelease,
486 /*
487  * Uncomment if you want the selection to disappear when you select something
488  * different in another window.
489  */
490 /*      [SelectionClear] = selclear, */
491         [SelectionNotify] = selnotify,
492         [SelectionRequest] = selrequest,
493 };
494
495 /* Globals */
496 static DC dc;
497 static XWindow xw;
498 static Term term;
499 static CSIEscape csiescseq;
500 static STREscape strescseq;
501 static int cmdfd;
502 static pid_t pid;
503 static Selection sel;
504 static int iofd = STDOUT_FILENO;
505 static char **opt_cmd = NULL;
506 static char *opt_io = NULL;
507 static char *opt_title = NULL;
508 static char *opt_embed = NULL;
509 static char *opt_class = NULL;
510 static char *opt_font = NULL;
511 static int oldbutton = 3; /* button event on startup: 3 = release */
512
513 static char *usedfont = NULL;
514 static double usedfontsize = 0;
515 static double defaultfontsize = 0;
516
517 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
518 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
519 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
520 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
521
522 /* Font Ring Cache */
523 enum {
524         FRC_NORMAL,
525         FRC_ITALIC,
526         FRC_BOLD,
527         FRC_ITALICBOLD
528 };
529
530 typedef struct {
531         XftFont *font;
532         int flags;
533         long unicodep;
534 } Fontcache;
535
536 /* Fontcache is an array now. A new font will be appended to the array. */
537 static Fontcache frc[16];
538 static int frclen = 0;
539
540 ssize_t
541 xwrite(int fd, const char *s, size_t len) {
542         size_t aux = len;
543
544         while(len > 0) {
545                 ssize_t r = write(fd, s, len);
546                 if(r < 0)
547                         return r;
548                 len -= r;
549                 s += r;
550         }
551         return aux;
552 }
553
554 void *
555 xmalloc(size_t len) {
556         void *p = malloc(len);
557
558         if(!p)
559                 die("Out of memory\n");
560
561         return p;
562 }
563
564 void *
565 xrealloc(void *p, size_t len) {
566         if((p = realloc(p, len)) == NULL)
567                 die("Out of memory\n");
568
569         return p;
570 }
571
572 char *
573 xstrdup(char *s) {
574         if((s = strdup(s)) == NULL)
575                 die("Out of memory\n");
576
577         return s;
578 }
579
580 size_t
581 utf8decode(char *c, long *u, size_t clen) {
582         size_t i, j, len, type;
583         long udecoded;
584
585         *u = UTF_INVALID;
586         if(!clen)
587                 return 0;
588         udecoded = utf8decodebyte(c[0], &len);
589         if(!BETWEEN(len, 1, UTF_SIZ))
590                 return 1;
591         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
592                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
593                 if(type != 0)
594                         return j;
595         }
596         if(j < len)
597                 return 0;
598         *u = udecoded;
599         utf8validate(u, len);
600         return len;
601 }
602
603 long
604 utf8decodebyte(char c, size_t *i) {
605         for(*i = 0; *i < LEN(utfmask); ++(*i))
606                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
607                         return (uchar)c & ~utfmask[*i];
608         return 0;
609 }
610
611 size_t
612 utf8encode(long u, char *c, size_t clen) {
613         size_t len, i;
614
615         len = utf8validate(&u, 0);
616         if(clen < len)
617                 return 0;
618         for(i = len - 1; i != 0; --i) {
619                 c[i] = utf8encodebyte(u, 0);
620                 u >>= 6;
621         }
622         c[0] = utf8encodebyte(u, len);
623         return len;
624 }
625
626 char
627 utf8encodebyte(long u, size_t i) {
628         return utfbyte[i] | (u & ~utfmask[i]);
629 }
630
631 size_t
632 utf8len(char *c) {
633         return utf8decode(c, &(long){0}, UTF_SIZ);
634 }
635
636 size_t
637 utf8validate(long *u, size_t i) {
638         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
639                 *u = UTF_INVALID;
640         for(i = 1; *u > utfmax[i]; ++i)
641                 ;
642         return i;
643 }
644
645 void
646 selinit(void) {
647         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
648         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
649         sel.mode = 0;
650         sel.ob.x = -1;
651         sel.primary = NULL;
652         sel.clipboard = NULL;
653         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
654         if(sel.xtarget == None)
655                 sel.xtarget = XA_STRING;
656 }
657
658 int
659 x2col(int x) {
660         x -= borderpx;
661         x /= xw.cw;
662
663         return LIMIT(x, 0, term.col-1);
664 }
665
666 int
667 y2row(int y) {
668         y -= borderpx;
669         y /= xw.ch;
670
671         return LIMIT(y, 0, term.row-1);
672 }
673
674 int tlinelen(int y) {
675         int i = term.col;
676
677         if(term.line[y][i - 1].mode & ATTR_WRAP)
678                 return i;
679
680         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
681                 --i;
682
683         return i;
684 }
685
686 void
687 selnormalize(void) {
688         int i;
689
690         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
691                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
692                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
693         } else {
694                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
695                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
696         }
697         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
698         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
699
700         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
701         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
702
703         /* expand selection over line breaks */
704         if (sel.type == SEL_RECTANGULAR)
705                 return;
706         i = tlinelen(sel.nb.y);
707         if (i < sel.nb.x)
708                 sel.nb.x = i;
709         if (tlinelen(sel.ne.y) <= sel.ne.x)
710                 sel.ne.x = term.col - 1;
711 }
712
713 bool
714 selected(int x, int y) {
715         if(sel.type == SEL_RECTANGULAR)
716                 return BETWEEN(y, sel.nb.y, sel.ne.y)
717                     && BETWEEN(x, sel.nb.x, sel.ne.x);
718
719         return BETWEEN(y, sel.nb.y, sel.ne.y)
720             && (y != sel.nb.y || x >= sel.nb.x)
721             && (y != sel.ne.y || x <= sel.ne.x);
722 }
723
724 void
725 selsnap(int mode, int *x, int *y, int direction) {
726         int newx, newy, xt, yt;
727         bool delim, prevdelim;
728         Glyph *gp, *prevgp;
729
730         switch(mode) {
731         case SNAP_WORD:
732                 /*
733                  * Snap around if the word wraps around at the end or
734                  * beginning of a line.
735                  */
736                 prevgp = &term.line[*y][*x];
737                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
738                 for(;;) {
739                         newx = *x + direction;
740                         newy = *y;
741                         if(!BETWEEN(newx, 0, term.col - 1)) {
742                                 newy += direction;
743                                 newx = (newx + term.col) % term.col;
744                                 if (!BETWEEN(newy, 0, term.row - 1))
745                                         break;
746
747                                 if(direction > 0)
748                                         yt = *y, xt = *x;
749                                 else
750                                         yt = newy, xt = newx;
751                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
752                                         break;
753                         }
754
755                         if (newx >= tlinelen(newy))
756                                 break;
757
758                         gp = &term.line[newy][newx];
759                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
760                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
761                                         || (delim && gp->c[0] != prevgp->c[0])))
762                                 break;
763
764                         *x = newx;
765                         *y = newy;
766                         prevgp = gp;
767                         prevdelim = delim;
768                 }
769                 break;
770         case SNAP_LINE:
771                 /*
772                  * Snap around if the the previous line or the current one
773                  * has set ATTR_WRAP at its end. Then the whole next or
774                  * previous line will be selected.
775                  */
776                 *x = (direction < 0) ? 0 : term.col - 1;
777                 if(direction < 0 && *y > 0) {
778                         for(; *y > 0; *y += direction) {
779                                 if(!(term.line[*y-1][term.col-1].mode
780                                                 & ATTR_WRAP)) {
781                                         break;
782                                 }
783                         }
784                 } else if(direction > 0 && *y < term.row-1) {
785                         for(; *y < term.row; *y += direction) {
786                                 if(!(term.line[*y][term.col-1].mode
787                                                 & ATTR_WRAP)) {
788                                         break;
789                                 }
790                         }
791                 }
792                 break;
793         }
794 }
795
796 void
797 getbuttoninfo(XEvent *e) {
798         int type;
799         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
800
801         sel.alt = IS_SET(MODE_ALTSCREEN);
802
803         sel.oe.x = x2col(e->xbutton.x);
804         sel.oe.y = y2row(e->xbutton.y);
805         selnormalize();
806
807         sel.type = SEL_REGULAR;
808         for(type = 1; type < LEN(selmasks); ++type) {
809                 if(match(selmasks[type], state)) {
810                         sel.type = type;
811                         break;
812                 }
813         }
814 }
815
816 void
817 mousereport(XEvent *e) {
818         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
819             button = e->xbutton.button, state = e->xbutton.state,
820             len;
821         char buf[40];
822         static int ox, oy;
823
824         /* from urxvt */
825         if(e->xbutton.type == MotionNotify) {
826                 if(x == ox && y == oy)
827                         return;
828                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
829                         return;
830                 /* MOUSE_MOTION: no reporting if no button is pressed */
831                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
832                         return;
833
834                 button = oldbutton + 32;
835                 ox = x;
836                 oy = y;
837         } else {
838                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
839                         button = 3;
840                 } else {
841                         button -= Button1;
842                         if(button >= 3)
843                                 button += 64 - 3;
844                 }
845                 if(e->xbutton.type == ButtonPress) {
846                         oldbutton = button;
847                         ox = x;
848                         oy = y;
849                 } else if(e->xbutton.type == ButtonRelease) {
850                         oldbutton = 3;
851                         /* MODE_MOUSEX10: no button release reporting */
852                         if(IS_SET(MODE_MOUSEX10))
853                                 return;
854                         if (button == 64 || button == 65)
855                                 return;
856                 }
857         }
858
859         if(!IS_SET(MODE_MOUSEX10)) {
860                 button += (state & ShiftMask   ? 4  : 0)
861                         + (state & Mod4Mask    ? 8  : 0)
862                         + (state & ControlMask ? 16 : 0);
863         }
864
865         len = 0;
866         if(IS_SET(MODE_MOUSESGR)) {
867                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
868                                 button, x+1, y+1,
869                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
870         } else if(x < 223 && y < 223) {
871                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
872                                 32+button, 32+x+1, 32+y+1);
873         } else {
874                 return;
875         }
876
877         ttywrite(buf, len);
878 }
879
880 void
881 bpress(XEvent *e) {
882         struct timespec now;
883         Mousekey *mk;
884
885         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
886                 mousereport(e);
887                 return;
888         }
889
890         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
891                 if(e->xbutton.button == mk->b
892                                 && match(mk->mask, e->xbutton.state)) {
893                         ttysend(mk->s, strlen(mk->s));
894                         return;
895                 }
896         }
897
898         if(e->xbutton.button == Button1) {
899                 clock_gettime(CLOCK_MONOTONIC, &now);
900
901                 /* Clear previous selection, logically and visually. */
902                 selclear(NULL);
903                 sel.mode = 1;
904                 sel.type = SEL_REGULAR;
905                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
906                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
907
908                 /*
909                  * If the user clicks below predefined timeouts specific
910                  * snapping behaviour is exposed.
911                  */
912                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
913                         sel.snap = SNAP_LINE;
914                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
915                         sel.snap = SNAP_WORD;
916                 } else {
917                         sel.snap = 0;
918                 }
919                 selnormalize();
920
921                 /*
922                  * Draw selection, unless it's regular and we don't want to
923                  * make clicks visible
924                  */
925                 if(sel.snap != 0) {
926                         sel.mode++;
927                         tsetdirt(sel.nb.y, sel.ne.y);
928                 }
929                 sel.tclick2 = sel.tclick1;
930                 sel.tclick1 = now;
931         }
932 }
933
934 char *
935 getsel(void) {
936         char *str, *ptr;
937         int y, bufsize, size, lastx, linelen;
938         Glyph *gp, *last;
939
940         if(sel.ob.x == -1)
941                 return NULL;
942
943         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
944         ptr = str = xmalloc(bufsize);
945
946         /* append every set & selected glyph to the selection */
947         for(y = sel.nb.y; y <= sel.ne.y; y++) {
948                 linelen = tlinelen(y);
949
950                 if(sel.type == SEL_RECTANGULAR) {
951                         gp = &term.line[y][sel.nb.x];
952                         lastx = sel.ne.x;
953                 } else {
954                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
955                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
956                 }
957                 last = &term.line[y][MIN(lastx, linelen-1)];
958                 while(last >= gp && last->c[0] == ' ')
959                         --last;
960
961                 for( ; gp <= last; ++gp) {
962                         if(gp->mode & ATTR_WDUMMY)
963                                 continue;
964
965                         size = utf8len(gp->c);
966                         memcpy(ptr, gp->c, size);
967                         ptr += size;
968                 }
969
970                 /*
971                  * Copy and pasting of line endings is inconsistent
972                  * in the inconsistent terminal and GUI world.
973                  * The best solution seems like to produce '\n' when
974                  * something is copied from st and convert '\n' to
975                  * '\r', when something to be pasted is received by
976                  * st.
977                  * FIXME: Fix the computer world.
978                  */
979                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
980                         *ptr++ = '\n';
981         }
982         *ptr = 0;
983         return str;
984 }
985
986 void
987 selcopy(void) {
988         xsetsel(getsel());
989 }
990
991 void
992 selnotify(XEvent *e) {
993         ulong nitems, ofs, rem;
994         int format;
995         uchar *data, *last, *repl;
996         Atom type;
997         XSelectionEvent *xsev;
998
999         ofs = 0;
1000         xsev = (XSelectionEvent *)e;
1001         if (xsev->property == None)
1002             return;
1003         do {
1004                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1005                                         BUFSIZ/4, False, AnyPropertyType,
1006                                         &type, &format, &nitems, &rem,
1007                                         &data)) {
1008                         fprintf(stderr, "Clipboard allocation failed\n");
1009                         return;
1010                 }
1011
1012                 /*
1013                  * As seen in getsel:
1014                  * Line endings are inconsistent in the terminal and GUI world
1015                  * copy and pasting. When receiving some selection data,
1016                  * replace all '\n' with '\r'.
1017                  * FIXME: Fix the computer world.
1018                  */
1019                 repl = data;
1020                 last = data + nitems * format / 8;
1021                 while((repl = memchr(repl, '\n', last - repl))) {
1022                         *repl++ = '\r';
1023                 }
1024
1025                 if(IS_SET(MODE_BRCKTPASTE))
1026                         ttywrite("\033[200~", 6);
1027                 ttysend((char *)data, nitems * format / 8);
1028                 if(IS_SET(MODE_BRCKTPASTE))
1029                         ttywrite("\033[201~", 6);
1030                 XFree(data);
1031                 /* number of 32-bit chunks returned */
1032                 ofs += nitems * format / 32;
1033         } while(rem > 0);
1034 }
1035
1036 void
1037 selpaste(const Arg *dummy) {
1038         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1039                         xw.win, CurrentTime);
1040 }
1041
1042 void
1043 clipcopy(const Arg *dummy) {
1044         Atom clipboard;
1045
1046         if(sel.clipboard != NULL)
1047                 free(sel.clipboard);
1048
1049         if(sel.primary != NULL) {
1050                 sel.clipboard = xstrdup(sel.primary);
1051                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1052                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1053         }
1054 }
1055
1056 void
1057 clippaste(const Arg *dummy) {
1058         Atom clipboard;
1059
1060         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1061         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1062                         xw.win, CurrentTime);
1063 }
1064
1065 void
1066 selclear(XEvent *e) {
1067         if(sel.ob.x == -1)
1068                 return;
1069         sel.ob.x = -1;
1070         tsetdirt(sel.nb.y, sel.ne.y);
1071 }
1072
1073 void
1074 selrequest(XEvent *e) {
1075         XSelectionRequestEvent *xsre;
1076         XSelectionEvent xev;
1077         Atom xa_targets, string, clipboard;
1078         char *seltext;
1079
1080         xsre = (XSelectionRequestEvent *) e;
1081         xev.type = SelectionNotify;
1082         xev.requestor = xsre->requestor;
1083         xev.selection = xsre->selection;
1084         xev.target = xsre->target;
1085         xev.time = xsre->time;
1086         /* reject */
1087         xev.property = None;
1088
1089         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1090         if(xsre->target == xa_targets) {
1091                 /* respond with the supported type */
1092                 string = sel.xtarget;
1093                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1094                                 XA_ATOM, 32, PropModeReplace,
1095                                 (uchar *) &string, 1);
1096                 xev.property = xsre->property;
1097         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1098                 /*
1099                  * xith XA_STRING non ascii characters may be incorrect in the
1100                  * requestor. It is not our problem, use utf8.
1101                  */
1102                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1103                 if(xsre->selection == XA_PRIMARY) {
1104                         seltext = sel.primary;
1105                 } else if(xsre->selection == clipboard) {
1106                         seltext = sel.clipboard;
1107                 } else {
1108                         fprintf(stderr,
1109                                 "Unhandled clipboard selection 0x%lx\n",
1110                                 xsre->selection);
1111                         return;
1112                 }
1113                 if(seltext != NULL) {
1114                         XChangeProperty(xsre->display, xsre->requestor,
1115                                         xsre->property, xsre->target,
1116                                         8, PropModeReplace,
1117                                         (uchar *)seltext, strlen(seltext));
1118                         xev.property = xsre->property;
1119                 }
1120         }
1121
1122         /* all done, send a notification to the listener */
1123         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1124                 fprintf(stderr, "Error sending SelectionNotify event\n");
1125 }
1126
1127 void
1128 xsetsel(char *str) {
1129         free(sel.primary);
1130         sel.primary = str;
1131
1132         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1133 }
1134
1135 void
1136 brelease(XEvent *e) {
1137         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1138                 mousereport(e);
1139                 return;
1140         }
1141
1142         if(e->xbutton.button == Button2) {
1143                 selpaste(NULL);
1144         } else if(e->xbutton.button == Button1) {
1145                 if(sel.mode < 2) {
1146                         selclear(NULL);
1147                 } else {
1148                         getbuttoninfo(e);
1149                         selcopy();
1150                 }
1151                 sel.mode = 0;
1152                 tsetdirt(sel.nb.y, sel.ne.y);
1153         }
1154 }
1155
1156 void
1157 bmotion(XEvent *e) {
1158         int oldey, oldex, oldsby, oldsey;
1159
1160         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1161                 mousereport(e);
1162                 return;
1163         }
1164
1165         if(!sel.mode)
1166                 return;
1167
1168         sel.mode++;
1169         oldey = sel.oe.y;
1170         oldex = sel.oe.x;
1171         oldsby = sel.nb.y;
1172         oldsey = sel.ne.y;
1173         getbuttoninfo(e);
1174
1175         if(oldey != sel.oe.y || oldex != sel.oe.x)
1176                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1177 }
1178
1179 void
1180 die(const char *errstr, ...) {
1181         va_list ap;
1182
1183         va_start(ap, errstr);
1184         vfprintf(stderr, errstr, ap);
1185         va_end(ap);
1186         exit(EXIT_FAILURE);
1187 }
1188
1189 void
1190 execsh(void) {
1191         char **args, *sh, *prog;
1192         const struct passwd *pw;
1193         char buf[sizeof(long) * 8 + 1];
1194
1195         errno = 0;
1196         if((pw = getpwuid(getuid())) == NULL) {
1197                 if(errno)
1198                         die("getpwuid:%s\n", strerror(errno));
1199                 else
1200                         die("who are you?\n");
1201         }
1202
1203         if (!(sh = getenv("SHELL"))) {
1204                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1205         }
1206
1207         if(opt_cmd)
1208                 prog = opt_cmd[0];
1209         else if(utmp)
1210                 prog = utmp;
1211         else
1212                 prog = sh;
1213         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1214
1215         snprintf(buf, sizeof(buf), "%lu", xw.win);
1216
1217         unsetenv("COLUMNS");
1218         unsetenv("LINES");
1219         unsetenv("TERMCAP");
1220         setenv("LOGNAME", pw->pw_name, 1);
1221         setenv("USER", pw->pw_name, 1);
1222         setenv("SHELL", sh, 1);
1223         setenv("HOME", pw->pw_dir, 1);
1224         setenv("TERM", termname, 1);
1225         setenv("WINDOWID", buf, 1);
1226
1227         signal(SIGCHLD, SIG_DFL);
1228         signal(SIGHUP, SIG_DFL);
1229         signal(SIGINT, SIG_DFL);
1230         signal(SIGQUIT, SIG_DFL);
1231         signal(SIGTERM, SIG_DFL);
1232         signal(SIGALRM, SIG_DFL);
1233
1234         execvp(prog, args);
1235         _exit(EXIT_FAILURE);
1236 }
1237
1238 void
1239 sigchld(int a) {
1240         int stat, ret;
1241
1242         if(waitpid(pid, &stat, 0) < 0)
1243                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1244
1245         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1246         if (ret != EXIT_SUCCESS)
1247                 die("child finished with error '%d'\n", stat);
1248         exit(EXIT_SUCCESS);
1249 }
1250
1251 void
1252 ttynew(void) {
1253         int m, s;
1254         struct winsize w = {term.row, term.col, 0, 0};
1255
1256         /* seems to work fine on linux, openbsd and freebsd */
1257         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1258                 die("openpty failed: %s\n", strerror(errno));
1259
1260         switch(pid = fork()) {
1261         case -1:
1262                 die("fork failed\n");
1263                 break;
1264         case 0:
1265                 setsid(); /* create a new process group */
1266                 dup2(s, STDIN_FILENO);
1267                 dup2(s, STDOUT_FILENO);
1268                 dup2(s, STDERR_FILENO);
1269                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1270                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1271                 close(s);
1272                 close(m);
1273                 execsh();
1274                 break;
1275         default:
1276                 close(s);
1277                 cmdfd = m;
1278                 signal(SIGCHLD, sigchld);
1279                 if(opt_io) {
1280                         term.mode |= MODE_PRINT;
1281                         iofd = (!strcmp(opt_io, "-")) ?
1282                                   STDOUT_FILENO :
1283                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1284                         if(iofd < 0) {
1285                                 fprintf(stderr, "Error opening %s:%s\n",
1286                                         opt_io, strerror(errno));
1287                         }
1288                 }
1289                 break;
1290         }
1291 }
1292
1293 void
1294 ttyread(void) {
1295         static char buf[BUFSIZ];
1296         static int buflen = 0;
1297         char *ptr;
1298         char s[UTF_SIZ];
1299         int charsize; /* size of utf8 char in bytes */
1300         long unicodep;
1301         int ret;
1302
1303         /* append read bytes to unprocessed bytes */
1304         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1305                 die("Couldn't read from shell: %s\n", strerror(errno));
1306
1307         /* process every complete utf8 char */
1308         buflen += ret;
1309         ptr = buf;
1310         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1311                 utf8encode(unicodep, s, UTF_SIZ);
1312                 tputc(s, charsize);
1313                 ptr += charsize;
1314                 buflen -= charsize;
1315         }
1316
1317         /* keep any uncomplete utf8 char for the next call */
1318         memmove(buf, ptr, buflen);
1319 }
1320
1321 void
1322 ttywrite(const char *s, size_t n) {
1323         if(xwrite(cmdfd, s, n) == -1)
1324                 die("write error on tty: %s\n", strerror(errno));
1325 }
1326
1327 void
1328 ttysend(char *s, size_t n) {
1329         ttywrite(s, n);
1330         if(IS_SET(MODE_ECHO))
1331                 techo(s, n);
1332 }
1333
1334 void
1335 ttyresize(void) {
1336         struct winsize w;
1337
1338         w.ws_row = term.row;
1339         w.ws_col = term.col;
1340         w.ws_xpixel = xw.tw;
1341         w.ws_ypixel = xw.th;
1342         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1343                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1344 }
1345
1346 int
1347 tattrset(int attr) {
1348         int i, j;
1349
1350         for(i = 0; i < term.row-1; i++) {
1351                 for(j = 0; j < term.col-1; j++) {
1352                         if(term.line[i][j].mode & attr)
1353                                 return 1;
1354                 }
1355         }
1356
1357         return 0;
1358 }
1359
1360 void
1361 tsetdirt(int top, int bot) {
1362         int i;
1363
1364         LIMIT(top, 0, term.row-1);
1365         LIMIT(bot, 0, term.row-1);
1366
1367         for(i = top; i <= bot; i++)
1368                 term.dirty[i] = 1;
1369 }
1370
1371 void
1372 tsetdirtattr(int attr) {
1373         int i, j;
1374
1375         for(i = 0; i < term.row-1; i++) {
1376                 for(j = 0; j < term.col-1; j++) {
1377                         if(term.line[i][j].mode & attr) {
1378                                 tsetdirt(i, i);
1379                                 break;
1380                         }
1381                 }
1382         }
1383 }
1384
1385 void
1386 tfulldirt(void) {
1387         tsetdirt(0, term.row-1);
1388 }
1389
1390 void
1391 tcursor(int mode) {
1392         static TCursor c[2];
1393         bool alt = IS_SET(MODE_ALTSCREEN);
1394
1395         if(mode == CURSOR_SAVE) {
1396                 c[alt] = term.c;
1397         } else if(mode == CURSOR_LOAD) {
1398                 term.c = c[alt];
1399                 tmoveto(c[alt].x, c[alt].y);
1400         }
1401 }
1402
1403 void
1404 treset(void) {
1405         uint i;
1406
1407         term.c = (TCursor){{
1408                 .mode = ATTR_NULL,
1409                 .fg = defaultfg,
1410                 .bg = defaultbg
1411         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1412
1413         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1414         for(i = tabspaces; i < term.col; i += tabspaces)
1415                 term.tabs[i] = 1;
1416         term.top = 0;
1417         term.bot = term.row - 1;
1418         term.mode = MODE_WRAP;
1419         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1420         term.charset = 0;
1421
1422         for(i = 0; i < 2; i++) {
1423                 tmoveto(0, 0);
1424                 tcursor(CURSOR_SAVE);
1425                 tclearregion(0, 0, term.col-1, term.row-1);
1426                 tswapscreen();
1427         }
1428 }
1429
1430 void
1431 tnew(int col, int row) {
1432         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1433         tresize(col, row);
1434         term.numlock = 1;
1435
1436         treset();
1437 }
1438
1439 void
1440 tswapscreen(void) {
1441         Line *tmp = term.line;
1442
1443         term.line = term.alt;
1444         term.alt = tmp;
1445         term.mode ^= MODE_ALTSCREEN;
1446         tfulldirt();
1447 }
1448
1449 void
1450 tscrolldown(int orig, int n) {
1451         int i;
1452         Line temp;
1453
1454         LIMIT(n, 0, term.bot-orig+1);
1455
1456         tsetdirt(orig, term.bot-n);
1457         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1458
1459         for(i = term.bot; i >= orig+n; i--) {
1460                 temp = term.line[i];
1461                 term.line[i] = term.line[i-n];
1462                 term.line[i-n] = temp;
1463         }
1464
1465         selscroll(orig, n);
1466 }
1467
1468 void
1469 tscrollup(int orig, int n) {
1470         int i;
1471         Line temp;
1472
1473         LIMIT(n, 0, term.bot-orig+1);
1474
1475         tclearregion(0, orig, term.col-1, orig+n-1);
1476         tsetdirt(orig+n, term.bot);
1477
1478         for(i = orig; i <= term.bot-n; i++) {
1479                 temp = term.line[i];
1480                 term.line[i] = term.line[i+n];
1481                 term.line[i+n] = temp;
1482         }
1483
1484         selscroll(orig, -n);
1485 }
1486
1487 void
1488 selscroll(int orig, int n) {
1489         if(sel.ob.x == -1)
1490                 return;
1491
1492         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1493                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1494                         selclear(NULL);
1495                         return;
1496                 }
1497                 if(sel.type == SEL_RECTANGULAR) {
1498                         if(sel.ob.y < term.top)
1499                                 sel.ob.y = term.top;
1500                         if(sel.oe.y > term.bot)
1501                                 sel.oe.y = term.bot;
1502                 } else {
1503                         if(sel.ob.y < term.top) {
1504                                 sel.ob.y = term.top;
1505                                 sel.ob.x = 0;
1506                         }
1507                         if(sel.oe.y > term.bot) {
1508                                 sel.oe.y = term.bot;
1509                                 sel.oe.x = term.col;
1510                         }
1511                 }
1512                 selnormalize();
1513         }
1514 }
1515
1516 void
1517 tnewline(int first_col) {
1518         int y = term.c.y;
1519
1520         if(y == term.bot) {
1521                 tscrollup(term.top, 1);
1522         } else {
1523                 y++;
1524         }
1525         tmoveto(first_col ? 0 : term.c.x, y);
1526 }
1527
1528 void
1529 csiparse(void) {
1530         char *p = csiescseq.buf, *np;
1531         long int v;
1532
1533         csiescseq.narg = 0;
1534         if(*p == '?') {
1535                 csiescseq.priv = 1;
1536                 p++;
1537         }
1538
1539         csiescseq.buf[csiescseq.len] = '\0';
1540         while(p < csiescseq.buf+csiescseq.len) {
1541                 np = NULL;
1542                 v = strtol(p, &np, 10);
1543                 if(np == p)
1544                         v = 0;
1545                 if(v == LONG_MAX || v == LONG_MIN)
1546                         v = -1;
1547                 csiescseq.arg[csiescseq.narg++] = v;
1548                 p = np;
1549                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1550                         break;
1551                 p++;
1552         }
1553         csiescseq.mode[0] = *p++;
1554         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1555 }
1556
1557 /* for absolute user moves, when decom is set */
1558 void
1559 tmoveato(int x, int y) {
1560         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1561 }
1562
1563 void
1564 tmoveto(int x, int y) {
1565         int miny, maxy;
1566
1567         if(term.c.state & CURSOR_ORIGIN) {
1568                 miny = term.top;
1569                 maxy = term.bot;
1570         } else {
1571                 miny = 0;
1572                 maxy = term.row - 1;
1573         }
1574         term.c.state &= ~CURSOR_WRAPNEXT;
1575         term.c.x = LIMIT(x, 0, term.col-1);
1576         term.c.y = LIMIT(y, miny, maxy);
1577 }
1578
1579 void
1580 tsetchar(char *c, Glyph *attr, int x, int y) {
1581         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1582                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1583                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1584                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1585                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1586                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1587                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1588                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1589                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1590         };
1591
1592         /*
1593          * The table is proudly stolen from rxvt.
1594          */
1595         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1596                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1597                         c = vt100_0[c[0] - 0x41];
1598                 }
1599         }
1600
1601         if(term.line[y][x].mode & ATTR_WIDE) {
1602                 if(x+1 < term.col) {
1603                         term.line[y][x+1].c[0] = ' ';
1604                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1605                 }
1606         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1607                 term.line[y][x-1].c[0] = ' ';
1608                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1609         }
1610
1611         term.dirty[y] = 1;
1612         term.line[y][x] = *attr;
1613         memcpy(term.line[y][x].c, c, UTF_SIZ);
1614 }
1615
1616 void
1617 tclearregion(int x1, int y1, int x2, int y2) {
1618         int x, y, temp;
1619         Glyph *gp;
1620
1621         if(x1 > x2)
1622                 temp = x1, x1 = x2, x2 = temp;
1623         if(y1 > y2)
1624                 temp = y1, y1 = y2, y2 = temp;
1625
1626         LIMIT(x1, 0, term.col-1);
1627         LIMIT(x2, 0, term.col-1);
1628         LIMIT(y1, 0, term.row-1);
1629         LIMIT(y2, 0, term.row-1);
1630
1631         for(y = y1; y <= y2; y++) {
1632                 term.dirty[y] = 1;
1633                 for(x = x1; x <= x2; x++) {
1634                         gp = &term.line[y][x];
1635                         if(selected(x, y))
1636                                 selclear(NULL);
1637                         gp->fg = term.c.attr.fg;
1638                         gp->bg = term.c.attr.bg;
1639                         gp->mode = 0;
1640                         memcpy(gp->c, " ", 2);
1641                 }
1642         }
1643 }
1644
1645 void
1646 tdeletechar(int n) {
1647         int dst, src, size;
1648         Glyph *line;
1649
1650         LIMIT(n, 0, term.col - term.c.x);
1651
1652         dst = term.c.x;
1653         src = term.c.x + n;
1654         size = term.col - src;
1655         line = term.line[term.c.y];
1656
1657         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1658         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1659 }
1660
1661 void
1662 tinsertblank(int n) {
1663         int dst, src, size;
1664         Glyph *line;
1665
1666         LIMIT(n, 0, term.col - term.c.x);
1667
1668         dst = term.c.x + n;
1669         src = term.c.x;
1670         size = term.col - dst;
1671         line = term.line[term.c.y];
1672
1673         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1674         tclearregion(src, term.c.y, dst - 1, term.c.y);
1675 }
1676
1677 void
1678 tinsertblankline(int n) {
1679         if(BETWEEN(term.c.y, term.top, term.bot))
1680                 tscrolldown(term.c.y, n);
1681 }
1682
1683 void
1684 tdeleteline(int n) {
1685         if(BETWEEN(term.c.y, term.top, term.bot))
1686                 tscrollup(term.c.y, n);
1687 }
1688
1689 int32_t
1690 tdefcolor(int *attr, int *npar, int l) {
1691         int32_t idx = -1;
1692         uint r, g, b;
1693
1694         switch (attr[*npar + 1]) {
1695         case 2: /* direct color in RGB space */
1696                 if (*npar + 4 >= l) {
1697                         fprintf(stderr,
1698                                 "erresc(38): Incorrect number of parameters (%d)\n",
1699                                 *npar);
1700                         break;
1701                 }
1702                 r = attr[*npar + 2];
1703                 g = attr[*npar + 3];
1704                 b = attr[*npar + 4];
1705                 *npar += 4;
1706                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1707                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1708                                 r, g, b);
1709                 else
1710                         idx = TRUECOLOR(r, g, b);
1711                 break;
1712         case 5: /* indexed color */
1713                 if (*npar + 2 >= l) {
1714                         fprintf(stderr,
1715                                 "erresc(38): Incorrect number of parameters (%d)\n",
1716                                 *npar);
1717                         break;
1718                 }
1719                 *npar += 2;
1720                 if(!BETWEEN(attr[*npar], 0, 255))
1721                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1722                 else
1723                         idx = attr[*npar];
1724                 break;
1725         case 0: /* implemented defined (only foreground) */
1726         case 1: /* transparent */
1727         case 3: /* direct color in CMY space */
1728         case 4: /* direct color in CMYK space */
1729         default:
1730                 fprintf(stderr,
1731                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1732                 break;
1733         }
1734
1735         return idx;
1736 }
1737
1738 void
1739 tsetattr(int *attr, int l) {
1740         int i;
1741         int32_t idx;
1742
1743         for(i = 0; i < l; i++) {
1744                 switch(attr[i]) {
1745                 case 0:
1746                         term.c.attr.mode &= ~(
1747                                 ATTR_BOLD       |
1748                                 ATTR_FAINT      |
1749                                 ATTR_ITALIC     |
1750                                 ATTR_UNDERLINE  |
1751                                 ATTR_BLINK      |
1752                                 ATTR_REVERSE    |
1753                                 ATTR_INVISIBLE  |
1754                                 ATTR_STRUCK     );
1755                         term.c.attr.fg = defaultfg;
1756                         term.c.attr.bg = defaultbg;
1757                         break;
1758                 case 1:
1759                         term.c.attr.mode |= ATTR_BOLD;
1760                         break;
1761                 case 2:
1762                         term.c.attr.mode |= ATTR_FAINT;
1763                         break;
1764                 case 3:
1765                         term.c.attr.mode |= ATTR_ITALIC;
1766                         break;
1767                 case 4:
1768                         term.c.attr.mode |= ATTR_UNDERLINE;
1769                         break;
1770                 case 5: /* slow blink */
1771                         /* FALLTHROUGH */
1772                 case 6: /* rapid blink */
1773                         term.c.attr.mode |= ATTR_BLINK;
1774                         break;
1775                 case 7:
1776                         term.c.attr.mode |= ATTR_REVERSE;
1777                         break;
1778                 case 8:
1779                         term.c.attr.mode |= ATTR_INVISIBLE;
1780                         break;
1781                 case 9:
1782                         term.c.attr.mode |= ATTR_STRUCK;
1783                         break;
1784                 case 22:
1785                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1786                         break;
1787                 case 23:
1788                         term.c.attr.mode &= ~ATTR_ITALIC;
1789                         break;
1790                 case 24:
1791                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1792                         break;
1793                 case 25:
1794                         term.c.attr.mode &= ~ATTR_BLINK;
1795                         break;
1796                 case 27:
1797                         term.c.attr.mode &= ~ATTR_REVERSE;
1798                         break;
1799                 case 28:
1800                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1801                         break;
1802                 case 29:
1803                         term.c.attr.mode &= ~ATTR_STRUCK;
1804                         break;
1805                 case 38:
1806                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1807                                 term.c.attr.fg = idx;
1808                         break;
1809                 case 39:
1810                         term.c.attr.fg = defaultfg;
1811                         break;
1812                 case 48:
1813                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1814                                 term.c.attr.bg = idx;
1815                         break;
1816                 case 49:
1817                         term.c.attr.bg = defaultbg;
1818                         break;
1819                 default:
1820                         if(BETWEEN(attr[i], 30, 37)) {
1821                                 term.c.attr.fg = attr[i] - 30;
1822                         } else if(BETWEEN(attr[i], 40, 47)) {
1823                                 term.c.attr.bg = attr[i] - 40;
1824                         } else if(BETWEEN(attr[i], 90, 97)) {
1825                                 term.c.attr.fg = attr[i] - 90 + 8;
1826                         } else if(BETWEEN(attr[i], 100, 107)) {
1827                                 term.c.attr.bg = attr[i] - 100 + 8;
1828                         } else {
1829                                 fprintf(stderr,
1830                                         "erresc(default): gfx attr %d unknown\n",
1831                                         attr[i]), csidump();
1832                         }
1833                         break;
1834                 }
1835         }
1836 }
1837
1838 void
1839 tsetscroll(int t, int b) {
1840         int temp;
1841
1842         LIMIT(t, 0, term.row-1);
1843         LIMIT(b, 0, term.row-1);
1844         if(t > b) {
1845                 temp = t;
1846                 t = b;
1847                 b = temp;
1848         }
1849         term.top = t;
1850         term.bot = b;
1851 }
1852
1853 void
1854 tsetmode(bool priv, bool set, int *args, int narg) {
1855         int *lim, mode;
1856         bool alt;
1857
1858         for(lim = args + narg; args < lim; ++args) {
1859                 if(priv) {
1860                         switch(*args) {
1861                         case 1: /* DECCKM -- Cursor key */
1862                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1863                                 break;
1864                         case 5: /* DECSCNM -- Reverse video */
1865                                 mode = term.mode;
1866                                 MODBIT(term.mode, set, MODE_REVERSE);
1867                                 if(mode != term.mode)
1868                                         redraw();
1869                                 break;
1870                         case 6: /* DECOM -- Origin */
1871                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1872                                 tmoveato(0, 0);
1873                                 break;
1874                         case 7: /* DECAWM -- Auto wrap */
1875                                 MODBIT(term.mode, set, MODE_WRAP);
1876                                 break;
1877                         case 0:  /* Error (IGNORED) */
1878                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1879                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1880                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1881                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1882                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1883                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1884                         case 42: /* DECNRCM -- National characters (IGNORED) */
1885                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1886                                 break;
1887                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1888                                 MODBIT(term.mode, !set, MODE_HIDE);
1889                                 break;
1890                         case 9:    /* X10 mouse compatibility mode */
1891                                 xsetpointermotion(0);
1892                                 MODBIT(term.mode, 0, MODE_MOUSE);
1893                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1894                                 break;
1895                         case 1000: /* 1000: report button press */
1896                                 xsetpointermotion(0);
1897                                 MODBIT(term.mode, 0, MODE_MOUSE);
1898                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1899                                 break;
1900                         case 1002: /* 1002: report motion on button press */
1901                                 xsetpointermotion(0);
1902                                 MODBIT(term.mode, 0, MODE_MOUSE);
1903                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1904                                 break;
1905                         case 1003: /* 1003: enable all mouse motions */
1906                                 xsetpointermotion(set);
1907                                 MODBIT(term.mode, 0, MODE_MOUSE);
1908                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1909                                 break;
1910                         case 1004: /* 1004: send focus events to tty */
1911                                 MODBIT(term.mode, set, MODE_FOCUS);
1912                                 break;
1913                         case 1006: /* 1006: extended reporting mode */
1914                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1915                                 break;
1916                         case 1034:
1917                                 MODBIT(term.mode, set, MODE_8BIT);
1918                                 break;
1919                         case 1049: /* swap screen & set/restore cursor as xterm */
1920                                 if (!allowaltscreen)
1921                                         break;
1922                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1923                                 /* FALLTHROUGH */
1924                         case 47: /* swap screen */
1925                         case 1047:
1926                                 if (!allowaltscreen)
1927                                         break;
1928                                 alt = IS_SET(MODE_ALTSCREEN);
1929                                 if(alt) {
1930                                         tclearregion(0, 0, term.col-1,
1931                                                         term.row-1);
1932                                 }
1933                                 if(set ^ alt) /* set is always 1 or 0 */
1934                                         tswapscreen();
1935                                 if(*args != 1049)
1936                                         break;
1937                                 /* FALLTHROUGH */
1938                         case 1048:
1939                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1940                                 break;
1941                         case 2004: /* 2004: bracketed paste mode */
1942                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1943                                 break;
1944                         /* Not implemented mouse modes. See comments there. */
1945                         case 1001: /* mouse highlight mode; can hang the
1946                                       terminal by design when implemented. */
1947                         case 1005: /* UTF-8 mouse mode; will confuse
1948                                       applications not supporting UTF-8
1949                                       and luit. */
1950                         case 1015: /* urxvt mangled mouse mode; incompatible
1951                                       and can be mistaken for other control
1952                                       codes. */
1953                         default:
1954                                 fprintf(stderr,
1955                                         "erresc: unknown private set/reset mode %d\n",
1956                                         *args);
1957                                 break;
1958                         }
1959                 } else {
1960                         switch(*args) {
1961                         case 0:  /* Error (IGNORED) */
1962                                 break;
1963                         case 2:  /* KAM -- keyboard action */
1964                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1965                                 break;
1966                         case 4:  /* IRM -- Insertion-replacement */
1967                                 MODBIT(term.mode, set, MODE_INSERT);
1968                                 break;
1969                         case 12: /* SRM -- Send/Receive */
1970                                 MODBIT(term.mode, !set, MODE_ECHO);
1971                                 break;
1972                         case 20: /* LNM -- Linefeed/new line */
1973                                 MODBIT(term.mode, set, MODE_CRLF);
1974                                 break;
1975                         default:
1976                                 fprintf(stderr,
1977                                         "erresc: unknown set/reset mode %d\n",
1978                                         *args);
1979                                 break;
1980                         }
1981                 }
1982         }
1983 }
1984
1985 void
1986 csihandle(void) {
1987         char buf[40];
1988         int len;
1989
1990         switch(csiescseq.mode[0]) {
1991         default:
1992         unknown:
1993                 fprintf(stderr, "erresc: unknown csi ");
1994                 csidump();
1995                 /* die(""); */
1996                 break;
1997         case '@': /* ICH -- Insert <n> blank char */
1998                 DEFAULT(csiescseq.arg[0], 1);
1999                 tinsertblank(csiescseq.arg[0]);
2000                 break;
2001         case 'A': /* CUU -- Cursor <n> Up */
2002                 DEFAULT(csiescseq.arg[0], 1);
2003                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2004                 break;
2005         case 'B': /* CUD -- Cursor <n> Down */
2006         case 'e': /* VPR --Cursor <n> Down */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2009                 break;
2010         case 'i': /* MC -- Media Copy */
2011                 switch(csiescseq.arg[0]) {
2012                 case 0:
2013                         tdump();
2014                         break;
2015                 case 1:
2016                         tdumpline(term.c.y);
2017                         break;
2018                 case 2:
2019                         tdumpsel();
2020                         break;
2021                 case 4:
2022                         term.mode &= ~MODE_PRINT;
2023                         break;
2024                 case 5:
2025                         term.mode |= MODE_PRINT;
2026                         break;
2027                 }
2028                 break;
2029         case 'c': /* DA -- Device Attributes */
2030                 if(csiescseq.arg[0] == 0)
2031                         ttywrite(vtiden, sizeof(vtiden) - 1);
2032                 break;
2033         case 'C': /* CUF -- Cursor <n> Forward */
2034         case 'a': /* HPR -- Cursor <n> Forward */
2035                 DEFAULT(csiescseq.arg[0], 1);
2036                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2037                 break;
2038         case 'D': /* CUB -- Cursor <n> Backward */
2039                 DEFAULT(csiescseq.arg[0], 1);
2040                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2041                 break;
2042         case 'E': /* CNL -- Cursor <n> Down and first col */
2043                 DEFAULT(csiescseq.arg[0], 1);
2044                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2045                 break;
2046         case 'F': /* CPL -- Cursor <n> Up and first col */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2049                 break;
2050         case 'g': /* TBC -- Tabulation clear */
2051                 switch(csiescseq.arg[0]) {
2052                 case 0: /* clear current tab stop */
2053                         term.tabs[term.c.x] = 0;
2054                         break;
2055                 case 3: /* clear all the tabs */
2056                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2057                         break;
2058                 default:
2059                         goto unknown;
2060                 }
2061                 break;
2062         case 'G': /* CHA -- Move to <col> */
2063         case '`': /* HPA */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2066                 break;
2067         case 'H': /* CUP -- Move to <row> <col> */
2068         case 'f': /* HVP */
2069                 DEFAULT(csiescseq.arg[0], 1);
2070                 DEFAULT(csiescseq.arg[1], 1);
2071                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2072                 break;
2073         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2074                 DEFAULT(csiescseq.arg[0], 1);
2075                 tputtab(csiescseq.arg[0]);
2076                 break;
2077         case 'J': /* ED -- Clear screen */
2078                 selclear(NULL);
2079                 switch(csiescseq.arg[0]) {
2080                 case 0: /* below */
2081                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2082                         if(term.c.y < term.row-1) {
2083                                 tclearregion(0, term.c.y+1, term.col-1,
2084                                                 term.row-1);
2085                         }
2086                         break;
2087                 case 1: /* above */
2088                         if(term.c.y > 1)
2089                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2090                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2091                         break;
2092                 case 2: /* all */
2093                         tclearregion(0, 0, term.col-1, term.row-1);
2094                         break;
2095                 default:
2096                         goto unknown;
2097                 }
2098                 break;
2099         case 'K': /* EL -- Clear line */
2100                 switch(csiescseq.arg[0]) {
2101                 case 0: /* right */
2102                         tclearregion(term.c.x, term.c.y, term.col-1,
2103                                         term.c.y);
2104                         break;
2105                 case 1: /* left */
2106                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2107                         break;
2108                 case 2: /* all */
2109                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2110                         break;
2111                 }
2112                 break;
2113         case 'S': /* SU -- Scroll <n> line up */
2114                 DEFAULT(csiescseq.arg[0], 1);
2115                 tscrollup(term.top, csiescseq.arg[0]);
2116                 break;
2117         case 'T': /* SD -- Scroll <n> line down */
2118                 DEFAULT(csiescseq.arg[0], 1);
2119                 tscrolldown(term.top, csiescseq.arg[0]);
2120                 break;
2121         case 'L': /* IL -- Insert <n> blank lines */
2122                 DEFAULT(csiescseq.arg[0], 1);
2123                 tinsertblankline(csiescseq.arg[0]);
2124                 break;
2125         case 'l': /* RM -- Reset Mode */
2126                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2127                 break;
2128         case 'M': /* DL -- Delete <n> lines */
2129                 DEFAULT(csiescseq.arg[0], 1);
2130                 tdeleteline(csiescseq.arg[0]);
2131                 break;
2132         case 'X': /* ECH -- Erase <n> char */
2133                 DEFAULT(csiescseq.arg[0], 1);
2134                 tclearregion(term.c.x, term.c.y,
2135                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2136                 break;
2137         case 'P': /* DCH -- Delete <n> char */
2138                 DEFAULT(csiescseq.arg[0], 1);
2139                 tdeletechar(csiescseq.arg[0]);
2140                 break;
2141         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2142                 DEFAULT(csiescseq.arg[0], 1);
2143                 tputtab(-csiescseq.arg[0]);
2144                 break;
2145         case 'd': /* VPA -- Move to <row> */
2146                 DEFAULT(csiescseq.arg[0], 1);
2147                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2148                 break;
2149         case 'h': /* SM -- Set terminal mode */
2150                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2151                 break;
2152         case 'm': /* SGR -- Terminal attribute (color) */
2153                 tsetattr(csiescseq.arg, csiescseq.narg);
2154                 break;
2155         case 'n': /* DSR – Device Status Report (cursor position) */
2156                 if (csiescseq.arg[0] == 6) {
2157                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2158                                         term.c.y+1, term.c.x+1);
2159                         ttywrite(buf, len);
2160                 }
2161                 break;
2162         case 'r': /* DECSTBM -- Set Scrolling Region */
2163                 if(csiescseq.priv) {
2164                         goto unknown;
2165                 } else {
2166                         DEFAULT(csiescseq.arg[0], 1);
2167                         DEFAULT(csiescseq.arg[1], term.row);
2168                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2169                         tmoveato(0, 0);
2170                 }
2171                 break;
2172         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2173                 tcursor(CURSOR_SAVE);
2174                 break;
2175         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2176                 tcursor(CURSOR_LOAD);
2177                 break;
2178         case ' ':
2179                 switch (csiescseq.mode[1]) {
2180                         case 'q': /* DECSCUSR -- Set Cursor Style */
2181                                 DEFAULT(csiescseq.arg[0], 1);
2182                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2183                                         goto unknown;
2184                                 }
2185                                 xw.cursor = csiescseq.arg[0];
2186                                 break;
2187                         default:
2188                                 goto unknown;
2189                 }
2190                 break;
2191         }
2192 }
2193
2194 void
2195 csidump(void) {
2196         int i;
2197         uint c;
2198
2199         printf("ESC[");
2200         for(i = 0; i < csiescseq.len; i++) {
2201                 c = csiescseq.buf[i] & 0xff;
2202                 if(isprint(c)) {
2203                         putchar(c);
2204                 } else if(c == '\n') {
2205                         printf("(\\n)");
2206                 } else if(c == '\r') {
2207                         printf("(\\r)");
2208                 } else if(c == 0x1b) {
2209                         printf("(\\e)");
2210                 } else {
2211                         printf("(%02x)", c);
2212                 }
2213         }
2214         putchar('\n');
2215 }
2216
2217 void
2218 csireset(void) {
2219         memset(&csiescseq, 0, sizeof(csiescseq));
2220 }
2221
2222 void
2223 strhandle(void) {
2224         char *p = NULL;
2225         int j, narg, par;
2226
2227         term.esc &= ~(ESC_STR_END|ESC_STR);
2228         strparse();
2229         narg = strescseq.narg;
2230         par = atoi(strescseq.args[0]);
2231
2232         switch(strescseq.type) {
2233         case ']': /* OSC -- Operating System Command */
2234                 switch(par) {
2235                 case 0:
2236                 case 1:
2237                 case 2:
2238                         if(narg > 1)
2239                                 xsettitle(strescseq.args[1]);
2240                         return;
2241                 case 4: /* color set */
2242                         if(narg < 3)
2243                                 break;
2244                         p = strescseq.args[2];
2245                         /* FALLTHROUGH */
2246                 case 104: /* color reset, here p = NULL */
2247                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2248                         if(xsetcolorname(j, p)) {
2249                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2250                         } else {
2251                                 /*
2252                                  * TODO if defaultbg color is changed, borders
2253                                  * are dirty
2254                                  */
2255                                 redraw();
2256                         }
2257                         return;
2258                 }
2259                 break;
2260         case 'k': /* old title set compatibility */
2261                 xsettitle(strescseq.args[0]);
2262                 return;
2263         case 'P': /* DCS -- Device Control String */
2264         case '_': /* APC -- Application Program Command */
2265         case '^': /* PM -- Privacy Message */
2266                 return;
2267         }
2268
2269         fprintf(stderr, "erresc: unknown str ");
2270         strdump();
2271 }
2272
2273 void
2274 strparse(void) {
2275         int c;
2276         char *p = strescseq.buf;
2277
2278         strescseq.narg = 0;
2279         strescseq.buf[strescseq.len] = '\0';
2280
2281         if(*p == '\0')
2282                 return;
2283
2284         while(strescseq.narg < STR_ARG_SIZ) {
2285                 strescseq.args[strescseq.narg++] = p;
2286                 while((c = *p) != ';' && c != '\0')
2287                         ++p;
2288                 if(c == '\0')
2289                         return;
2290                 *p++ = '\0';
2291         }
2292 }
2293
2294 void
2295 strdump(void) {
2296         int i;
2297         uint c;
2298
2299         printf("ESC%c", strescseq.type);
2300         for(i = 0; i < strescseq.len; i++) {
2301                 c = strescseq.buf[i] & 0xff;
2302                 if(c == '\0') {
2303                         return;
2304                 } else if(isprint(c)) {
2305                         putchar(c);
2306                 } else if(c == '\n') {
2307                         printf("(\\n)");
2308                 } else if(c == '\r') {
2309                         printf("(\\r)");
2310                 } else if(c == 0x1b) {
2311                         printf("(\\e)");
2312                 } else {
2313                         printf("(%02x)", c);
2314                 }
2315         }
2316         printf("ESC\\\n");
2317 }
2318
2319 void
2320 strreset(void) {
2321         memset(&strescseq, 0, sizeof(strescseq));
2322 }
2323
2324 void
2325 tprinter(char *s, size_t len) {
2326         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2327                 fprintf(stderr, "Error writing in %s:%s\n",
2328                         opt_io, strerror(errno));
2329                 close(iofd);
2330                 iofd = -1;
2331         }
2332 }
2333
2334 void
2335 toggleprinter(const Arg *arg) {
2336         term.mode ^= MODE_PRINT;
2337 }
2338
2339 void
2340 printscreen(const Arg *arg) {
2341         tdump();
2342 }
2343
2344 void
2345 printsel(const Arg *arg) {
2346         tdumpsel();
2347 }
2348
2349 void
2350 tdumpsel(void) {
2351         char *ptr;
2352
2353         if((ptr = getsel())) {
2354                 tprinter(ptr, strlen(ptr));
2355                 free(ptr);
2356         }
2357 }
2358
2359 void
2360 tdumpline(int n) {
2361         Glyph *bp, *end;
2362
2363         bp = &term.line[n][0];
2364         end = &bp[MIN(tlinelen(n), term.col) - 1];
2365         if(bp != end || bp->c[0] != ' ') {
2366                 for( ;bp <= end; ++bp)
2367                         tprinter(bp->c, utf8len(bp->c));
2368         }
2369         tprinter("\n", 1);
2370 }
2371
2372 void
2373 tdump(void) {
2374         int i;
2375
2376         for(i = 0; i < term.row; ++i)
2377                 tdumpline(i);
2378 }
2379
2380 void
2381 tputtab(int n) {
2382         uint x = term.c.x;
2383
2384         if(n > 0) {
2385                 while(x < term.col && n--)
2386                         for(++x; x < term.col && !term.tabs[x]; ++x)
2387                                 /* nothing */ ;
2388         } else if(n < 0) {
2389                 while(x > 0 && n++)
2390                         for(--x; x > 0 && !term.tabs[x]; --x)
2391                                 /* nothing */ ;
2392         }
2393         tmoveto(x, term.c.y);
2394 }
2395
2396 void
2397 techo(char *buf, int len) {
2398         for(; len > 0; buf++, len--) {
2399                 char c = *buf;
2400
2401                 if(ISCONTROL((uchar) c)) { /* control code */
2402                         if(c & 0x80) {
2403                                 c &= 0x7f;
2404                                 tputc("^", 1);
2405                                 tputc("[", 1);
2406                         } else if(c != '\n' && c != '\r' && c != '\t') {
2407                                 c ^= 0x40;
2408                                 tputc("^", 1);
2409                         }
2410                         tputc(&c, 1);
2411                 } else {
2412                         break;
2413                 }
2414         }
2415         if(len)
2416                 tputc(buf, len);
2417 }
2418
2419 void
2420 tdeftran(char ascii) {
2421         static char cs[] = "0B";
2422         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2423         char *p;
2424
2425         if((p = strchr(cs, ascii)) == NULL) {
2426                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2427         } else {
2428                 term.trantbl[term.icharset] = vcs[p - cs];
2429         }
2430 }
2431
2432 void
2433 tdectest(char c) {
2434         static char E[UTF_SIZ] = "E";
2435         int x, y;
2436
2437         if(c == '8') { /* DEC screen alignment test. */
2438                 for(x = 0; x < term.col; ++x) {
2439                         for(y = 0; y < term.row; ++y)
2440                                 tsetchar(E, &term.c.attr, x, y);
2441                 }
2442         }
2443 }
2444
2445 void
2446 tstrsequence(uchar c) {
2447         switch (c) {
2448         case 0x90:   /* DCS -- Device Control String */
2449                 c = 'P';
2450                 break;
2451         case 0x9f:   /* APC -- Application Program Command */
2452                 c = '_';
2453                 break;
2454         case 0x9e:   /* PM -- Privacy Message */
2455                 c = '^';
2456                 break;
2457         case 0x9d:   /* OSC -- Operating System Command */
2458                 c = ']';
2459                 break;
2460         }
2461         strreset();
2462         strescseq.type = c;
2463         term.esc |= ESC_STR;
2464         return;
2465 }
2466
2467 void
2468 tcontrolcode(uchar ascii) {
2469         static char question[UTF_SIZ] = "?";
2470
2471         switch(ascii) {
2472         case '\t':   /* HT */
2473                 tputtab(1);
2474                 return;
2475         case '\b':   /* BS */
2476                 tmoveto(term.c.x-1, term.c.y);
2477                 return;
2478         case '\r':   /* CR */
2479                 tmoveto(0, term.c.y);
2480                 return;
2481         case '\f':   /* LF */
2482         case '\v':   /* VT */
2483         case '\n':   /* LF */
2484                 /* go to first col if the mode is set */
2485                 tnewline(IS_SET(MODE_CRLF));
2486                 return;
2487         case '\a':   /* BEL */
2488                 if(term.esc & ESC_STR_END) {
2489                         /* backwards compatibility to xterm */
2490                         strhandle();
2491                 } else {
2492                         if(!(xw.state & WIN_FOCUSED))
2493                                 xseturgency(1);
2494                         if (bellvolume)
2495                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2496                 }
2497                 break;
2498         case '\033': /* ESC */
2499                 csireset();
2500                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2501                 term.esc |= ESC_START;
2502                 return;
2503         case '\016': /* SO (LS1 -- Locking shift 1) */
2504         case '\017': /* SI (LS0 -- Locking shift 0) */
2505                 term.charset = 1 - (ascii - '\016');
2506                 return;
2507         case '\032': /* SUB */
2508                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2509         case '\030': /* CAN */
2510                 csireset();
2511                 break;
2512         case '\005': /* ENQ (IGNORED) */
2513         case '\000': /* NUL (IGNORED) */
2514         case '\021': /* XON (IGNORED) */
2515         case '\023': /* XOFF (IGNORED) */
2516         case 0177:   /* DEL (IGNORED) */
2517                 return;
2518         case 0x84:   /* TODO: IND */
2519                 break;
2520         case 0x85:   /* NEL -- Next line */
2521                 tnewline(1); /* always go to first col */
2522                 break;
2523         case 0x88:   /* HTS -- Horizontal tab stop */
2524                 term.tabs[term.c.x] = 1;
2525                 break;
2526         case 0x8d:   /* TODO: RI */
2527         case 0x8e:   /* TODO: SS2 */
2528         case 0x8f:   /* TODO: SS3 */
2529         case 0x98:   /* TODO: SOS */
2530                 break;
2531         case 0x9a:   /* DECID -- Identify Terminal */
2532                 ttywrite(vtiden, sizeof(vtiden) - 1);
2533                 break;
2534         case 0x9b:   /* TODO: CSI */
2535         case 0x9c:   /* TODO: ST */
2536                 break;
2537         case 0x90:   /* DCS -- Device Control String */
2538         case 0x9f:   /* APC -- Application Program Command */
2539         case 0x9e:   /* PM -- Privacy Message */
2540         case 0x9d:   /* OSC -- Operating System Command */
2541                 tstrsequence(ascii);
2542                 return;
2543         }
2544         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2545         term.esc &= ~(ESC_STR_END|ESC_STR);
2546         return;
2547 }
2548
2549 /*
2550  * returns 1 when the sequence is finished and it hasn't to read
2551  * more characters for this sequence, otherwise 0
2552  */
2553 int
2554 eschandle(uchar ascii) {
2555         switch(ascii) {
2556         case '[':
2557                 term.esc |= ESC_CSI;
2558                 return 0;
2559         case '#':
2560                 term.esc |= ESC_TEST;
2561                 return 0;
2562         case 'P': /* DCS -- Device Control String */
2563         case '_': /* APC -- Application Program Command */
2564         case '^': /* PM -- Privacy Message */
2565         case ']': /* OSC -- Operating System Command */
2566         case 'k': /* old title set compatibility */
2567                 tstrsequence(ascii);
2568                 return 0;
2569         case 'n': /* LS2 -- Locking shift 2 */
2570         case 'o': /* LS3 -- Locking shift 3 */
2571                 term.charset = 2 + (ascii - 'n');
2572                 break;
2573         case '(': /* GZD4 -- set primary charset G0 */
2574         case ')': /* G1D4 -- set secondary charset G1 */
2575         case '*': /* G2D4 -- set tertiary charset G2 */
2576         case '+': /* G3D4 -- set quaternary charset G3 */
2577                 term.icharset = ascii - '(';
2578                 term.esc |= ESC_ALTCHARSET;
2579                 return 0;
2580         case 'D': /* IND -- Linefeed */
2581                 if(term.c.y == term.bot) {
2582                         tscrollup(term.top, 1);
2583                 } else {
2584                         tmoveto(term.c.x, term.c.y+1);
2585                 }
2586                 break;
2587         case 'E': /* NEL -- Next line */
2588                 tnewline(1); /* always go to first col */
2589                 break;
2590         case 'H': /* HTS -- Horizontal tab stop */
2591                 term.tabs[term.c.x] = 1;
2592                 break;
2593         case 'M': /* RI -- Reverse index */
2594                 if(term.c.y == term.top) {
2595                         tscrolldown(term.top, 1);
2596                 } else {
2597                         tmoveto(term.c.x, term.c.y-1);
2598                 }
2599                 break;
2600         case 'Z': /* DECID -- Identify Terminal */
2601                 ttywrite(vtiden, sizeof(vtiden) - 1);
2602                 break;
2603         case 'c': /* RIS -- Reset to inital state */
2604                 treset();
2605                 xresettitle();
2606                 xloadcols();
2607                 break;
2608         case '=': /* DECPAM -- Application keypad */
2609                 term.mode |= MODE_APPKEYPAD;
2610                 break;
2611         case '>': /* DECPNM -- Normal keypad */
2612                 term.mode &= ~MODE_APPKEYPAD;
2613                 break;
2614         case '7': /* DECSC -- Save Cursor */
2615                 tcursor(CURSOR_SAVE);
2616                 break;
2617         case '8': /* DECRC -- Restore Cursor */
2618                 tcursor(CURSOR_LOAD);
2619                 break;
2620         case '\\': /* ST -- String Terminator */
2621                 if(term.esc & ESC_STR_END)
2622                         strhandle();
2623                 break;
2624         default:
2625                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2626                         (uchar) ascii, isprint(ascii)? ascii:'.');
2627                 break;
2628         }
2629         return 1;
2630 }
2631
2632 void
2633 tputc(char *c, int len) {
2634         uchar ascii;
2635         bool control;
2636         long unicodep;
2637         int width;
2638         Glyph *gp;
2639
2640         if(len == 1) {
2641                 width = 1;
2642                 unicodep = ascii = *c;
2643         } else {
2644                 utf8decode(c, &unicodep, UTF_SIZ);
2645                 if ((width = wcwidth(unicodep)) == -1) {
2646                         c = "\357\277\275";     /* UTF_INVALID */
2647                         width = 1;
2648                 }
2649                 ascii = unicodep;
2650         }
2651
2652         if(IS_SET(MODE_PRINT))
2653                 tprinter(c, len);
2654         control = ISCONTROL(unicodep);
2655
2656         /*
2657          * STR sequence must be checked before anything else
2658          * because it uses all following characters until it
2659          * receives a ESC, a SUB, a ST or any other C1 control
2660          * character.
2661          */
2662         if(term.esc & ESC_STR) {
2663                 if(len == 1 &&
2664                    (ascii == '\a' || ascii == 030 ||
2665                     ascii == 032  || ascii == 033 ||
2666                     ISCONTROLC1(unicodep))) {
2667                         term.esc &= ~(ESC_START|ESC_STR);
2668                         term.esc |= ESC_STR_END;
2669                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2670                         memmove(&strescseq.buf[strescseq.len], c, len);
2671                         strescseq.len += len;
2672                         return;
2673                 } else {
2674                 /*
2675                  * Here is a bug in terminals. If the user never sends
2676                  * some code to stop the str or esc command, then st
2677                  * will stop responding. But this is better than
2678                  * silently failing with unknown characters. At least
2679                  * then users will report back.
2680                  *
2681                  * In the case users ever get fixed, here is the code:
2682                  */
2683                 /*
2684                  * term.esc = 0;
2685                  * strhandle();
2686                  */
2687                         return;
2688                 }
2689         }
2690
2691         /*
2692          * Actions of control codes must be performed as soon they arrive
2693          * because they can be embedded inside a control sequence, and
2694          * they must not cause conflicts with sequences.
2695          */
2696         if(control) {
2697                 tcontrolcode(ascii);
2698                 /*
2699                  * control codes are not shown ever
2700                  */
2701                 return;
2702         } else if(term.esc & ESC_START) {
2703                 if(term.esc & ESC_CSI) {
2704                         csiescseq.buf[csiescseq.len++] = ascii;
2705                         if(BETWEEN(ascii, 0x40, 0x7E)
2706                                         || csiescseq.len >= \
2707                                         sizeof(csiescseq.buf)-1) {
2708                                 term.esc = 0;
2709                                 csiparse();
2710                                 csihandle();
2711                         }
2712                         return;
2713                 } else if(term.esc & ESC_ALTCHARSET) {
2714                         tdeftran(ascii);
2715                 } else if(term.esc & ESC_TEST) {
2716                         tdectest(ascii);
2717                 } else {
2718                         if (!eschandle(ascii))
2719                                 return;
2720                         /* sequence already finished */
2721                 }
2722                 term.esc = 0;
2723                 /*
2724                  * All characters which form part of a sequence are not
2725                  * printed
2726                  */
2727                 return;
2728         }
2729         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2730                 selclear(NULL);
2731
2732         gp = &term.line[term.c.y][term.c.x];
2733         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2734                 gp->mode |= ATTR_WRAP;
2735                 tnewline(1);
2736                 gp = &term.line[term.c.y][term.c.x];
2737         }
2738
2739         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2740                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2741
2742         if(term.c.x+width > term.col) {
2743                 tnewline(1);
2744                 gp = &term.line[term.c.y][term.c.x];
2745         }
2746
2747         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2748
2749         if(width == 2) {
2750                 gp->mode |= ATTR_WIDE;
2751                 if(term.c.x+1 < term.col) {
2752                         gp[1].c[0] = '\0';
2753                         gp[1].mode = ATTR_WDUMMY;
2754                 }
2755         }
2756         if(term.c.x+width < term.col) {
2757                 tmoveto(term.c.x+width, term.c.y);
2758         } else {
2759                 term.c.state |= CURSOR_WRAPNEXT;
2760         }
2761 }
2762
2763 void
2764 tresize(int col, int row) {
2765         int i;
2766         int minrow = MIN(row, term.row);
2767         int mincol = MIN(col, term.col);
2768         bool *bp;
2769         TCursor c;
2770
2771         if(col < 1 || row < 1) {
2772                 fprintf(stderr,
2773                         "tresize: error resizing to %dx%d\n", col, row);
2774                 return;
2775         }
2776
2777         /*
2778          * slide screen to keep cursor where we expect it -
2779          * tscrollup would work here, but we can optimize to
2780          * memmove because we're freeing the earlier lines
2781          */
2782         for(i = 0; i <= term.c.y - row; i++) {
2783                 free(term.line[i]);
2784                 free(term.alt[i]);
2785         }
2786         memmove(term.line, term.line + i, row * sizeof(Line));
2787         memmove(term.alt, term.alt + i, row * sizeof(Line));
2788         for(i += row; i < term.row; i++) {
2789                 free(term.line[i]);
2790                 free(term.alt[i]);
2791         }
2792
2793         /* resize to new height */
2794         term.line = xrealloc(term.line, row * sizeof(Line));
2795         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2796         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2797         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2798
2799         /* resize each row to new width, zero-pad if needed */
2800         for(i = 0; i < minrow; i++) {
2801                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2802                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2803         }
2804
2805         /* allocate any new rows */
2806         for(/* i == minrow */; i < row; i++) {
2807                 term.line[i] = xmalloc(col * sizeof(Glyph));
2808                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2809         }
2810         if(col > term.col) {
2811                 bp = term.tabs + term.col;
2812
2813                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2814                 while(--bp > term.tabs && !*bp)
2815                         /* nothing */ ;
2816                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2817                         *bp = 1;
2818         }
2819         /* update terminal size */
2820         term.col = col;
2821         term.row = row;
2822         /* reset scrolling region */
2823         tsetscroll(0, row-1);
2824         /* make use of the LIMIT in tmoveto */
2825         tmoveto(term.c.x, term.c.y);
2826         /* Clearing both screens (it makes dirty all lines) */
2827         c = term.c;
2828         for(i = 0; i < 2; i++) {
2829                 if(mincol < col && 0 < minrow) {
2830                         tclearregion(mincol, 0, col - 1, minrow - 1);
2831                 }
2832                 if(0 < col && minrow < row) {
2833                         tclearregion(0, minrow, col - 1, row - 1);
2834                 }
2835                 tswapscreen();
2836                 tcursor(CURSOR_LOAD);
2837         }
2838         term.c = c;
2839 }
2840
2841 void
2842 xresize(int col, int row) {
2843         xw.tw = MAX(1, col * xw.cw);
2844         xw.th = MAX(1, row * xw.ch);
2845
2846         XFreePixmap(xw.dpy, xw.buf);
2847         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2848                         DefaultDepth(xw.dpy, xw.scr));
2849         XftDrawChange(xw.draw, xw.buf);
2850         xclear(0, 0, xw.w, xw.h);
2851 }
2852
2853 ushort
2854 sixd_to_16bit(int x) {
2855         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2856 }
2857
2858 void
2859 xloadcols(void) {
2860         int i;
2861         XRenderColor color = { .alpha = 0xffff };
2862         static bool loaded;
2863         Color *cp;
2864
2865         if(loaded) {
2866                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2867                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2868         }
2869
2870         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2871         for(i = 0; i < LEN(colorname); i++) {
2872                 if(!colorname[i])
2873                         continue;
2874                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2875                         die("Could not allocate color '%s'\n", colorname[i]);
2876                 }
2877         }
2878
2879         /* load colors [16-231] ; same colors as xterm */
2880         for(i = 16; i < 6*6*6+16; i++) {
2881                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2882                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2883                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2884                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2885                         die("Could not allocate color %d\n", i);
2886         }
2887
2888         /* load colors [232-255] ; grayscale */
2889         for(; i < 256; i++) {
2890                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2891                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2892                         die("Could not allocate color %d\n", i);
2893         }
2894         loaded = true;
2895 }
2896
2897 int
2898 xsetcolorname(int x, const char *name) {
2899         XRenderColor color = { .alpha = 0xffff };
2900         Color ncolor;
2901
2902         if(!BETWEEN(x, 0, LEN(colorname)))
2903                 return 1;
2904
2905         if(!name) {
2906                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2907                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2908                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2909                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2910                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2911                                                 xw.cmap, &color, &ncolor)) {
2912                                 return 1;
2913                         }
2914
2915                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2916                         dc.col[x] = ncolor;
2917                         return 0;
2918                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2919                         color.red = color.green = color.blue = \
2920                                     0x0808 + 0x0a0a * (x - (16 + 216));
2921                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2922                                                 xw.cmap, &color, &ncolor)) {
2923                                 return 1;
2924                         }
2925
2926                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2927                         dc.col[x] = ncolor;
2928                         return 0;
2929                 } else { /* system colors */
2930                         name = colorname[x];
2931                 }
2932         }
2933         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2934                 return 1;
2935
2936         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2937         dc.col[x] = ncolor;
2938         return 0;
2939 }
2940
2941 void
2942 xtermclear(int col1, int row1, int col2, int row2) {
2943         XftDrawRect(xw.draw,
2944                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2945                         borderpx + col1 * xw.cw,
2946                         borderpx + row1 * xw.ch,
2947                         (col2-col1+1) * xw.cw,
2948                         (row2-row1+1) * xw.ch);
2949 }
2950
2951 /*
2952  * Absolute coordinates.
2953  */
2954 void
2955 xclear(int x1, int y1, int x2, int y2) {
2956         XftDrawRect(xw.draw,
2957                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2958                         x1, y1, x2-x1, y2-y1);
2959 }
2960
2961 void
2962 xhints(void) {
2963         XClassHint class = {opt_class ? opt_class : termname, termname};
2964         XWMHints wm = {.flags = InputHint, .input = 1};
2965         XSizeHints *sizeh = NULL;
2966
2967         sizeh = XAllocSizeHints();
2968
2969         sizeh->flags = PSize | PResizeInc | PBaseSize;
2970         sizeh->height = xw.h;
2971         sizeh->width = xw.w;
2972         sizeh->height_inc = xw.ch;
2973         sizeh->width_inc = xw.cw;
2974         sizeh->base_height = 2 * borderpx;
2975         sizeh->base_width = 2 * borderpx;
2976         if(xw.isfixed == True) {
2977                 sizeh->flags |= PMaxSize | PMinSize;
2978                 sizeh->min_width = sizeh->max_width = xw.w;
2979                 sizeh->min_height = sizeh->max_height = xw.h;
2980         }
2981         if(xw.gm & (XValue|YValue)) {
2982                 sizeh->flags |= USPosition | PWinGravity;
2983                 sizeh->x = xw.l;
2984                 sizeh->y = xw.t;
2985                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2986         }
2987
2988         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2989                         &class);
2990         XFree(sizeh);
2991 }
2992
2993 int
2994 xgeommasktogravity(int mask) {
2995         switch(mask & (XNegative|YNegative)) {
2996         case 0:
2997                 return NorthWestGravity;
2998         case XNegative:
2999                 return NorthEastGravity;
3000         case YNegative:
3001                 return SouthWestGravity;
3002         }
3003         return SouthEastGravity;
3004 }
3005
3006 int
3007 xloadfont(Font *f, FcPattern *pattern) {
3008         FcPattern *match;
3009         FcResult result;
3010
3011         match = FcFontMatch(NULL, pattern, &result);
3012         if(!match)
3013                 return 1;
3014
3015         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3016                 FcPatternDestroy(match);
3017                 return 1;
3018         }
3019
3020         f->set = NULL;
3021         f->pattern = FcPatternDuplicate(pattern);
3022
3023         f->ascent = f->match->ascent;
3024         f->descent = f->match->descent;
3025         f->lbearing = 0;
3026         f->rbearing = f->match->max_advance_width;
3027
3028         f->height = f->ascent + f->descent;
3029         f->width = f->lbearing + f->rbearing;
3030
3031         return 0;
3032 }
3033
3034 void
3035 xloadfonts(char *fontstr, double fontsize) {
3036         FcPattern *pattern;
3037         FcResult r_sz, r_psz;
3038         double fontval;
3039         float ceilf(float);
3040
3041         if(fontstr[0] == '-') {
3042                 pattern = XftXlfdParse(fontstr, False, False);
3043         } else {
3044                 pattern = FcNameParse((FcChar8 *)fontstr);
3045         }
3046
3047         if(!pattern)
3048                 die("st: can't open font %s\n", fontstr);
3049
3050         if(fontsize > 1) {
3051                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3052                 FcPatternDel(pattern, FC_SIZE);
3053                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3054                 usedfontsize = fontsize;
3055         } else {
3056                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3057                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3058                 if(r_psz == FcResultMatch) {
3059                         usedfontsize = fontval;
3060                 } else if(r_sz == FcResultMatch) {
3061                         usedfontsize = -1;
3062                 } else {
3063                         /*
3064                          * Default font size is 12, if none given. This is to
3065                          * have a known usedfontsize value.
3066                          */
3067                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3068                         usedfontsize = 12;
3069                 }
3070                 defaultfontsize = usedfontsize;
3071         }
3072
3073         FcConfigSubstitute(0, pattern, FcMatchPattern);
3074         FcDefaultSubstitute(pattern);
3075
3076         if(xloadfont(&dc.font, pattern))
3077                 die("st: can't open font %s\n", fontstr);
3078
3079         if(usedfontsize < 0) {
3080                 FcPatternGetDouble(dc.font.match->pattern,
3081                                    FC_PIXEL_SIZE, 0, &fontval);
3082                 usedfontsize = fontval;
3083                 if(fontsize == 0)
3084                         defaultfontsize = fontval;
3085         }
3086
3087         /* Setting character width and height. */
3088         xw.cw = ceilf(dc.font.width * cwscale);
3089         xw.ch = ceilf(dc.font.height * chscale);
3090
3091         FcPatternDel(pattern, FC_SLANT);
3092         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3093         if(xloadfont(&dc.ifont, pattern))
3094                 die("st: can't open font %s\n", fontstr);
3095
3096         FcPatternDel(pattern, FC_WEIGHT);
3097         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3098         if(xloadfont(&dc.ibfont, pattern))
3099                 die("st: can't open font %s\n", fontstr);
3100
3101         FcPatternDel(pattern, FC_SLANT);
3102         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3103         if(xloadfont(&dc.bfont, pattern))
3104                 die("st: can't open font %s\n", fontstr);
3105
3106         FcPatternDestroy(pattern);
3107 }
3108
3109 void
3110 xunloadfont(Font *f) {
3111         XftFontClose(xw.dpy, f->match);
3112         FcPatternDestroy(f->pattern);
3113         if(f->set)
3114                 FcFontSetDestroy(f->set);
3115 }
3116
3117 void
3118 xunloadfonts(void) {
3119         /* Free the loaded fonts in the font cache.  */
3120         while(frclen > 0)
3121                 XftFontClose(xw.dpy, frc[--frclen].font);
3122
3123         xunloadfont(&dc.font);
3124         xunloadfont(&dc.bfont);
3125         xunloadfont(&dc.ifont);
3126         xunloadfont(&dc.ibfont);
3127 }
3128
3129 void
3130 xzoom(const Arg *arg) {
3131         Arg larg;
3132
3133         larg.i = usedfontsize + arg->i;
3134         xzoomabs(&larg);
3135 }
3136
3137 void
3138 xzoomabs(const Arg *arg) {
3139         xunloadfonts();
3140         xloadfonts(usedfont, arg->i);
3141         cresize(0, 0);
3142         redraw();
3143         xhints();
3144 }
3145
3146 void
3147 xzoomreset(const Arg *arg) {
3148         Arg larg;
3149
3150         if(defaultfontsize > 0) {
3151                 larg.i = defaultfontsize;
3152                 xzoomabs(&larg);
3153         }
3154 }
3155
3156 void
3157 xinit(void) {
3158         XGCValues gcvalues;
3159         Cursor cursor;
3160         Window parent;
3161         pid_t thispid = getpid();
3162
3163         if(!(xw.dpy = XOpenDisplay(NULL)))
3164                 die("Can't open display\n");
3165         xw.scr = XDefaultScreen(xw.dpy);
3166         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3167
3168         /* font */
3169         if(!FcInit())
3170                 die("Could not init fontconfig.\n");
3171
3172         usedfont = (opt_font == NULL)? font : opt_font;
3173         xloadfonts(usedfont, 0);
3174
3175         /* colors */
3176         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3177         xloadcols();
3178
3179         /* adjust fixed window geometry */
3180         xw.w = 2 * borderpx + term.col * xw.cw;
3181         xw.h = 2 * borderpx + term.row * xw.ch;
3182         if(xw.gm & XNegative)
3183                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3184         if(xw.gm & YNegative)
3185                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3186
3187         /* Events */
3188         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3189         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3190         xw.attrs.bit_gravity = NorthWestGravity;
3191         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3192                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3193                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3194         xw.attrs.colormap = xw.cmap;
3195
3196         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3197                 parent = XRootWindow(xw.dpy, xw.scr);
3198         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3199                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3200                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3201                         | CWEventMask | CWColormap, &xw.attrs);
3202
3203         memset(&gcvalues, 0, sizeof(gcvalues));
3204         gcvalues.graphics_exposures = False;
3205         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3206                         &gcvalues);
3207         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3208                         DefaultDepth(xw.dpy, xw.scr));
3209         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3210         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3211
3212         /* Xft rendering context */
3213         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3214
3215         /* input methods */
3216         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3217                 XSetLocaleModifiers("@im=local");
3218                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3219                         XSetLocaleModifiers("@im=");
3220                         if((xw.xim = XOpenIM(xw.dpy,
3221                                         NULL, NULL, NULL)) == NULL) {
3222                                 die("XOpenIM failed. Could not open input"
3223                                         " device.\n");
3224                         }
3225                 }
3226         }
3227         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3228                                            | XIMStatusNothing, XNClientWindow, xw.win,
3229                                            XNFocusWindow, xw.win, NULL);
3230         if(xw.xic == NULL)
3231                 die("XCreateIC failed. Could not obtain input method.\n");
3232
3233         /* white cursor, black outline */
3234         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3235         XDefineCursor(xw.dpy, xw.win, cursor);
3236         XRecolorCursor(xw.dpy, cursor,
3237                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3238                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3239
3240         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3241         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3242         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3243         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3244
3245         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3246         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3247                         PropModeReplace, (uchar *)&thispid, 1);
3248
3249         xresettitle();
3250         XMapWindow(xw.dpy, xw.win);
3251         xhints();
3252         XSync(xw.dpy, False);
3253 }
3254
3255 void
3256 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3257         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3258             width = charlen * xw.cw, xp, i;
3259         int frcflags, charexists;
3260         int u8fl, u8fblen, u8cblen, doesexist;
3261         char *u8c, *u8fs;
3262         long unicodep;
3263         Font *font = &dc.font;
3264         FcResult fcres;
3265         FcPattern *fcpattern, *fontpattern;
3266         FcFontSet *fcsets[] = { NULL };
3267         FcCharSet *fccharset;
3268         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3269         XRenderColor colfg, colbg;
3270         XRectangle r;
3271         int oneatatime;
3272
3273         frcflags = FRC_NORMAL;
3274
3275         if(base.mode & ATTR_ITALIC) {
3276                 if(base.fg == defaultfg)
3277                         base.fg = defaultitalic;
3278                 font = &dc.ifont;
3279                 frcflags = FRC_ITALIC;
3280         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3281                 if(base.fg == defaultfg)
3282                         base.fg = defaultitalic;
3283                 font = &dc.ibfont;
3284                 frcflags = FRC_ITALICBOLD;
3285         } else if(base.mode & ATTR_UNDERLINE) {
3286                 if(base.fg == defaultfg)
3287                         base.fg = defaultunderline;
3288         }
3289
3290         if(IS_TRUECOL(base.fg)) {
3291                 colfg.alpha = 0xffff;
3292                 colfg.red = TRUERED(base.fg);
3293                 colfg.green = TRUEGREEN(base.fg);
3294                 colfg.blue = TRUEBLUE(base.fg);
3295                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3296                 fg = &truefg;
3297         } else {
3298                 fg = &dc.col[base.fg];
3299         }
3300
3301         if(IS_TRUECOL(base.bg)) {
3302                 colbg.alpha = 0xffff;
3303                 colbg.green = TRUEGREEN(base.bg);
3304                 colbg.red = TRUERED(base.bg);
3305                 colbg.blue = TRUEBLUE(base.bg);
3306                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3307                 bg = &truebg;
3308         } else {
3309                 bg = &dc.col[base.bg];
3310         }
3311
3312         if(base.mode & ATTR_BOLD) {
3313                 /*
3314                  * change basic system colors [0-7]
3315                  * to bright system colors [8-15]
3316                  */
3317                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3318                         fg = &dc.col[base.fg + 8];
3319
3320                 if(base.mode & ATTR_ITALIC) {
3321                         font = &dc.ibfont;
3322                         frcflags = FRC_ITALICBOLD;
3323                 } else {
3324                         font = &dc.bfont;
3325                         frcflags = FRC_BOLD;
3326                 }
3327         }
3328
3329         if(IS_SET(MODE_REVERSE)) {
3330                 if(fg == &dc.col[defaultfg]) {
3331                         fg = &dc.col[defaultbg];
3332                 } else {
3333                         colfg.red = ~fg->color.red;
3334                         colfg.green = ~fg->color.green;
3335                         colfg.blue = ~fg->color.blue;
3336                         colfg.alpha = fg->color.alpha;
3337                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3338                                         &revfg);
3339                         fg = &revfg;
3340                 }
3341
3342                 if(bg == &dc.col[defaultbg]) {
3343                         bg = &dc.col[defaultfg];
3344                 } else {
3345                         colbg.red = ~bg->color.red;
3346                         colbg.green = ~bg->color.green;
3347                         colbg.blue = ~bg->color.blue;
3348                         colbg.alpha = bg->color.alpha;
3349                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3350                                         &revbg);
3351                         bg = &revbg;
3352                 }
3353         }
3354
3355         if(base.mode & ATTR_REVERSE) {
3356                 temp = fg;
3357                 fg = bg;
3358                 bg = temp;
3359         }
3360
3361         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3362                 colfg.red = fg->color.red / 2;
3363                 colfg.green = fg->color.green / 2;
3364                 colfg.blue = fg->color.blue / 2;
3365                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3366                 fg = &revfg;
3367         }
3368
3369         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3370                 fg = bg;
3371
3372         if(base.mode & ATTR_INVISIBLE)
3373                 fg = bg;
3374
3375         /* Intelligent cleaning up of the borders. */
3376         if(x == 0) {
3377                 xclear(0, (y == 0)? 0 : winy, borderpx,
3378                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3379         }
3380         if(x + charlen >= term.col) {
3381                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3382                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3383         }
3384         if(y == 0)
3385                 xclear(winx, 0, winx + width, borderpx);
3386         if(y == term.row-1)
3387                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3388
3389         /* Clean up the region we want to draw to. */
3390         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3391
3392         /* Set the clip region because Xft is sometimes dirty. */
3393         r.x = 0;
3394         r.y = 0;
3395         r.height = xw.ch;
3396         r.width = width;
3397         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3398
3399         for(xp = winx; bytelen > 0;) {
3400                 /*
3401                  * Search for the range in the to be printed string of glyphs
3402                  * that are in the main font. Then print that range. If
3403                  * some glyph is found that is not in the font, do the
3404                  * fallback dance.
3405                  */
3406                 u8fs = s;
3407                 u8fblen = 0;
3408                 u8fl = 0;
3409                 oneatatime = font->width != xw.cw;
3410                 for(;;) {
3411                         u8c = s;
3412                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3413                         s += u8cblen;
3414                         bytelen -= u8cblen;
3415
3416                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3417                         if(doesexist) {
3418                                         u8fl++;
3419                                         u8fblen += u8cblen;
3420                                         if(!oneatatime && bytelen > 0)
3421                                                         continue;
3422                         }
3423
3424                         if(u8fl > 0) {
3425                                 XftDrawStringUtf8(xw.draw, fg,
3426                                                 font->match, xp,
3427                                                 winy + font->ascent,
3428                                                 (FcChar8 *)u8fs,
3429                                                 u8fblen);
3430                                 xp += xw.cw * u8fl;
3431                         }
3432                         break;
3433                 }
3434                 if(doesexist) {
3435                         if(oneatatime)
3436                                 continue;
3437                         break;
3438                 }
3439
3440                 /* Search the font cache. */
3441                 for(i = 0; i < frclen; i++) {
3442                         charexists = XftCharExists(xw.dpy, frc[i].font, unicodep);
3443                         /* Everything correct. */
3444                         if(charexists && frc[i].flags == frcflags)
3445                                 break;
3446                         /* We got a default font for a not found glyph. */
3447                         if(!charexists && frc[i].flags == frcflags \
3448                                         && frc[i].unicodep == unicodep) {
3449                                 break;
3450                         }
3451                 }
3452
3453                 /* Nothing was found. */
3454                 if(i >= frclen) {
3455                         if(!font->set)
3456                                 font->set = FcFontSort(0, font->pattern,
3457                                                        FcTrue, 0, &fcres);
3458                         fcsets[0] = font->set;
3459
3460                         /*
3461                          * Nothing was found in the cache. Now use
3462                          * some dozen of Fontconfig calls to get the
3463                          * font for one single character.
3464                          *
3465                          * Xft and fontconfig are design failures.
3466                          */
3467                         fcpattern = FcPatternDuplicate(font->pattern);
3468                         fccharset = FcCharSetCreate();
3469
3470                         FcCharSetAddChar(fccharset, unicodep);
3471                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3472                                         fccharset);
3473                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3474                                         FcTrue);
3475
3476                         FcConfigSubstitute(0, fcpattern,
3477                                         FcMatchPattern);
3478                         FcDefaultSubstitute(fcpattern);
3479
3480                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3481                                         fcpattern, &fcres);
3482
3483                         /*
3484                          * Overwrite or create the new cache entry.
3485                          */
3486                         if(frclen >= LEN(frc)) {
3487                                 frclen = LEN(frc) - 1;
3488                                 XftFontClose(xw.dpy, frc[frclen].font);
3489                                 frc[frclen].unicodep = 0;
3490                         }
3491
3492                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3493                                         fontpattern);
3494                         frc[frclen].flags = frcflags;
3495                         frc[frclen].unicodep = unicodep;
3496
3497                         i = frclen;
3498                         frclen++;
3499
3500                         FcPatternDestroy(fcpattern);
3501                         FcCharSetDestroy(fccharset);
3502                 }
3503
3504                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3505                                 xp, winy + frc[i].font->ascent,
3506                                 (FcChar8 *)u8c, u8cblen);
3507
3508                 xp += xw.cw * wcwidth(unicodep);
3509         }
3510
3511         /*
3512          * This is how the loop above actually should be. Why does the
3513          * application have to care about font details?
3514          *
3515          * I have to repeat: Xft and Fontconfig are design failures.
3516          */
3517         /*
3518         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3519                         winy + font->ascent, (FcChar8 *)s, bytelen);
3520         */
3521
3522         if(base.mode & ATTR_UNDERLINE) {
3523                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3524                                 width, 1);
3525         }
3526
3527         if(base.mode & ATTR_STRUCK) {
3528                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3529                                 width, 1);
3530         }
3531
3532         /* Reset clip to none. */
3533         XftDrawSetClip(xw.draw, 0);
3534 }
3535
3536 void
3537 xdrawcursor(void) {
3538         static int oldx = 0, oldy = 0;
3539         int sl, width, curx;
3540         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3541
3542         LIMIT(oldx, 0, term.col-1);
3543         LIMIT(oldy, 0, term.row-1);
3544
3545         curx = term.c.x;
3546
3547         /* adjust position if in dummy */
3548         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3549                 oldx--;
3550         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3551                 curx--;
3552
3553         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3554
3555         /* remove the old cursor */
3556         sl = utf8len(term.line[oldy][oldx].c);
3557         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3558         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3559                         oldy, width, sl);
3560
3561         if(IS_SET(MODE_HIDE))
3562                 return;
3563
3564         /* draw the new one */
3565         if(xw.state & WIN_FOCUSED) {
3566                 switch (xw.cursor) {
3567                         case 0: /* Blinking Block */
3568                         case 1: /* Blinking Block (Default) */
3569                         case 2: /* Steady Block */
3570                                 if(IS_SET(MODE_REVERSE)) {
3571                                                 g.mode |= ATTR_REVERSE;
3572                                                 g.fg = defaultcs;
3573                                                 g.bg = defaultfg;
3574                                         }
3575
3576                                 sl = utf8len(g.c);
3577                                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3578                                         ? 2 : 1;
3579                                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3580                                 break;
3581                         case 3: /* Blinking Underline */
3582                         case 4: /* Steady Underline */
3583                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3584                                                 borderpx + curx * xw.cw,
3585                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3586                                                 xw.cw, cursorthickness);
3587                                 break;
3588                         case 5: /* Blinking bar */
3589                         case 6: /* Steady bar */
3590                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3591                                                 borderpx + curx * xw.cw,
3592                                                 borderpx + term.c.y * xw.ch,
3593                                                 cursorthickness, xw.ch);
3594                                 break;
3595                 }
3596         } else {
3597                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3598                                 borderpx + curx * xw.cw,
3599                                 borderpx + term.c.y * xw.ch,
3600                                 xw.cw - 1, 1);
3601                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3602                                 borderpx + curx * xw.cw,
3603                                 borderpx + term.c.y * xw.ch,
3604                                 1, xw.ch - 1);
3605                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3606                                 borderpx + (curx + 1) * xw.cw - 1,
3607                                 borderpx + term.c.y * xw.ch,
3608                                 1, xw.ch - 1);
3609                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3610                                 borderpx + curx * xw.cw,
3611                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3612                                 xw.cw, 1);
3613         }
3614         oldx = curx, oldy = term.c.y;
3615 }
3616
3617
3618 void
3619 xsettitle(char *p) {
3620         XTextProperty prop;
3621
3622         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3623                         &prop);
3624         XSetWMName(xw.dpy, xw.win, &prop);
3625         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3626         XFree(prop.value);
3627 }
3628
3629 void
3630 xresettitle(void) {
3631         xsettitle(opt_title ? opt_title : "st");
3632 }
3633
3634 void
3635 redraw(void) {
3636         tfulldirt();
3637         draw();
3638 }
3639
3640 void
3641 draw(void) {
3642         drawregion(0, 0, term.col, term.row);
3643         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3644                         xw.h, 0, 0);
3645         XSetForeground(xw.dpy, dc.gc,
3646                         dc.col[IS_SET(MODE_REVERSE)?
3647                                 defaultfg : defaultbg].pixel);
3648 }
3649
3650 void
3651 drawregion(int x1, int y1, int x2, int y2) {
3652         int ic, ib, x, y, ox, sl;
3653         Glyph base, new;
3654         char buf[DRAW_BUF_SIZ];
3655         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3656         long unicodep;
3657
3658         if(!(xw.state & WIN_VISIBLE))
3659                 return;
3660
3661         for(y = y1; y < y2; y++) {
3662                 if(!term.dirty[y])
3663                         continue;
3664
3665                 xtermclear(0, y, term.col, y);
3666                 term.dirty[y] = 0;
3667                 base = term.line[y][0];
3668                 ic = ib = ox = 0;
3669                 for(x = x1; x < x2; x++) {
3670                         new = term.line[y][x];
3671                         if(new.mode == ATTR_WDUMMY)
3672                                 continue;
3673                         if(ena_sel && selected(x, y))
3674                                 new.mode ^= ATTR_REVERSE;
3675                         if(ib > 0 && (ATTRCMP(base, new)
3676                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3677                                 xdraws(buf, base, ox, y, ic, ib);
3678                                 ic = ib = 0;
3679                         }
3680                         if(ib == 0) {
3681                                 ox = x;
3682                                 base = new;
3683                         }
3684
3685                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3686                         memcpy(buf+ib, new.c, sl);
3687                         ib += sl;
3688                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3689                 }
3690                 if(ib > 0)
3691                         xdraws(buf, base, ox, y, ic, ib);
3692         }
3693         xdrawcursor();
3694 }
3695
3696 void
3697 expose(XEvent *ev) {
3698         XExposeEvent *e = &ev->xexpose;
3699
3700         if(xw.state & WIN_REDRAW) {
3701                 if(!e->count)
3702                         xw.state &= ~WIN_REDRAW;
3703         }
3704         redraw();
3705 }
3706
3707 void
3708 visibility(XEvent *ev) {
3709         XVisibilityEvent *e = &ev->xvisibility;
3710
3711         if(e->state == VisibilityFullyObscured) {
3712                 xw.state &= ~WIN_VISIBLE;
3713         } else if(!(xw.state & WIN_VISIBLE)) {
3714                 /* need a full redraw for next Expose, not just a buf copy */
3715                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3716         }
3717 }
3718
3719 void
3720 unmap(XEvent *ev) {
3721         xw.state &= ~WIN_VISIBLE;
3722 }
3723
3724 void
3725 xsetpointermotion(int set) {
3726         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3727         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3728 }
3729
3730 void
3731 xseturgency(int add) {
3732         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3733
3734         MODBIT(h->flags, add, XUrgencyHint);
3735         XSetWMHints(xw.dpy, xw.win, h);
3736         XFree(h);
3737 }
3738
3739 void
3740 focus(XEvent *ev) {
3741         XFocusChangeEvent *e = &ev->xfocus;
3742
3743         if(e->mode == NotifyGrab)
3744                 return;
3745
3746         if(ev->type == FocusIn) {
3747                 XSetICFocus(xw.xic);
3748                 xw.state |= WIN_FOCUSED;
3749                 xseturgency(0);
3750                 if(IS_SET(MODE_FOCUS))
3751                         ttywrite("\033[I", 3);
3752         } else {
3753                 XUnsetICFocus(xw.xic);
3754                 xw.state &= ~WIN_FOCUSED;
3755                 if(IS_SET(MODE_FOCUS))
3756                         ttywrite("\033[O", 3);
3757         }
3758 }
3759
3760 bool
3761 match(uint mask, uint state) {
3762         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3763 }
3764
3765 void
3766 numlock(const Arg *dummy) {
3767         term.numlock ^= 1;
3768 }
3769
3770 char*
3771 kmap(KeySym k, uint state) {
3772         Key *kp;
3773         int i;
3774
3775         /* Check for mapped keys out of X11 function keys. */
3776         for(i = 0; i < LEN(mappedkeys); i++) {
3777                 if(mappedkeys[i] == k)
3778                         break;
3779         }
3780         if(i == LEN(mappedkeys)) {
3781                 if((k & 0xFFFF) < 0xFD00)
3782                         return NULL;
3783         }
3784
3785         for(kp = key; kp < key + LEN(key); kp++) {
3786                 if(kp->k != k)
3787                         continue;
3788
3789                 if(!match(kp->mask, state))
3790                         continue;
3791
3792                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3793                         continue;
3794                 if(term.numlock && kp->appkey == 2)
3795                         continue;
3796
3797                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3798                         continue;
3799
3800                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3801                         continue;
3802
3803                 return kp->s;
3804         }
3805
3806         return NULL;
3807 }
3808
3809 void
3810 kpress(XEvent *ev) {
3811         XKeyEvent *e = &ev->xkey;
3812         KeySym ksym;
3813         char buf[32], *customkey;
3814         int len;
3815         long c;
3816         Status status;
3817         Shortcut *bp;
3818
3819         if(IS_SET(MODE_KBDLOCK))
3820                 return;
3821
3822         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3823         /* 1. shortcuts */
3824         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3825                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3826                         bp->func(&(bp->arg));
3827                         return;
3828                 }
3829         }
3830
3831         /* 2. custom keys from config.h */
3832         if((customkey = kmap(ksym, e->state))) {
3833                 ttysend(customkey, strlen(customkey));
3834                 return;
3835         }
3836
3837         /* 3. composed string from input method */
3838         if(len == 0)
3839                 return;
3840         if(len == 1 && e->state & Mod1Mask) {
3841                 if(IS_SET(MODE_8BIT)) {
3842                         if(*buf < 0177) {
3843                                 c = *buf | 0x80;
3844                                 len = utf8encode(c, buf, UTF_SIZ);
3845                         }
3846                 } else {
3847                         buf[1] = buf[0];
3848                         buf[0] = '\033';
3849                         len = 2;
3850                 }
3851         }
3852         ttysend(buf, len);
3853 }
3854
3855
3856 void
3857 cmessage(XEvent *e) {
3858         /*
3859          * See xembed specs
3860          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3861          */
3862         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3863                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3864                         xw.state |= WIN_FOCUSED;
3865                         xseturgency(0);
3866                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3867                         xw.state &= ~WIN_FOCUSED;
3868                 }
3869         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3870                 /* Send SIGHUP to shell */
3871                 kill(pid, SIGHUP);
3872                 exit(EXIT_SUCCESS);
3873         }
3874 }
3875
3876 void
3877 cresize(int width, int height) {
3878         int col, row;
3879
3880         if(width != 0)
3881                 xw.w = width;
3882         if(height != 0)
3883                 xw.h = height;
3884
3885         col = (xw.w - 2 * borderpx) / xw.cw;
3886         row = (xw.h - 2 * borderpx) / xw.ch;
3887
3888         tresize(col, row);
3889         xresize(col, row);
3890         ttyresize();
3891 }
3892
3893 void
3894 resize(XEvent *e) {
3895         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3896                 return;
3897
3898         cresize(e->xconfigure.width, e->xconfigure.height);
3899 }
3900
3901 void
3902 run(void) {
3903         XEvent ev;
3904         int w = xw.w, h = xw.h;
3905         fd_set rfd;
3906         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3907         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3908         long deltatime;
3909
3910         /* Waiting for window mapping */
3911         do {
3912                 XNextEvent(xw.dpy, &ev);
3913                 if(ev.type == ConfigureNotify) {
3914                         w = ev.xconfigure.width;
3915                         h = ev.xconfigure.height;
3916                 }
3917         } while(ev.type != MapNotify);
3918
3919         ttynew();
3920         cresize(w, h);
3921
3922         clock_gettime(CLOCK_MONOTONIC, &last);
3923         lastblink = last;
3924
3925         for(xev = actionfps;;) {
3926                 FD_ZERO(&rfd);
3927                 FD_SET(cmdfd, &rfd);
3928                 FD_SET(xfd, &rfd);
3929
3930                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3931                         if(errno == EINTR)
3932                                 continue;
3933                         die("select failed: %s\n", strerror(errno));
3934                 }
3935                 if(FD_ISSET(cmdfd, &rfd)) {
3936                         ttyread();
3937                         if(blinktimeout) {
3938                                 blinkset = tattrset(ATTR_BLINK);
3939                                 if(!blinkset)
3940                                         MODBIT(term.mode, 0, MODE_BLINK);
3941                         }
3942                 }
3943
3944                 if(FD_ISSET(xfd, &rfd))
3945                         xev = actionfps;
3946
3947                 clock_gettime(CLOCK_MONOTONIC, &now);
3948                 drawtimeout.tv_sec = 0;
3949                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3950                 tv = &drawtimeout;
3951
3952                 dodraw = 0;
3953                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3954                         tsetdirtattr(ATTR_BLINK);
3955                         term.mode ^= MODE_BLINK;
3956                         lastblink = now;
3957                         dodraw = 1;
3958                 }
3959                 deltatime = TIMEDIFF(now, last);
3960                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3961                                 || deltatime < 0) {
3962                         dodraw = 1;
3963                         last = now;
3964                 }
3965
3966                 if(dodraw) {
3967                         while(XPending(xw.dpy)) {
3968                                 XNextEvent(xw.dpy, &ev);
3969                                 if(XFilterEvent(&ev, None))
3970                                         continue;
3971                                 if(handler[ev.type])
3972                                         (handler[ev.type])(&ev);
3973                         }
3974
3975                         draw();
3976                         XFlush(xw.dpy);
3977
3978                         if(xev && !FD_ISSET(xfd, &rfd))
3979                                 xev--;
3980                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3981                                 if(blinkset) {
3982                                         if(TIMEDIFF(now, lastblink) \
3983                                                         > blinktimeout) {
3984                                                 drawtimeout.tv_nsec = 1000;
3985                                         } else {
3986                                                 drawtimeout.tv_nsec = (1E6 * \
3987                                                         (blinktimeout - \
3988                                                         TIMEDIFF(now,
3989                                                                 lastblink)));
3990                                         }
3991                                         drawtimeout.tv_sec = \
3992                                             drawtimeout.tv_nsec / 1E9;
3993                                         drawtimeout.tv_nsec %= (long)1E9;
3994                                 } else {
3995                                         tv = NULL;
3996                                 }
3997                         }
3998                 }
3999         }
4000 }
4001
4002 void
4003 usage(void) {
4004         die("%s " VERSION " (c) 2010-2015 st engineers\n" \
4005         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4006         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
4007 }
4008
4009 int
4010 main(int argc, char *argv[]) {
4011         uint cols = 80, rows = 24;
4012
4013         xw.l = xw.t = 0;
4014         xw.isfixed = False;
4015         xw.cursor = 0;
4016
4017         ARGBEGIN {
4018         case 'a':
4019                 allowaltscreen = false;
4020                 break;
4021         case 'c':
4022                 opt_class = EARGF(usage());
4023                 break;
4024         case 'e':
4025                 /* eat all remaining arguments */
4026                 if(argc > 1) {
4027                         opt_cmd = &argv[1];
4028                         if(argv[1] != NULL && opt_title == NULL)
4029                                 opt_title = basename(xstrdup(argv[1]));
4030                 }
4031                 goto run;
4032         case 'f':
4033                 opt_font = EARGF(usage());
4034                 break;
4035         case 'g':
4036                 xw.gm = XParseGeometry(EARGF(usage()),
4037                                 &xw.l, &xw.t, &cols, &rows);
4038                 break;
4039         case 'i':
4040                 xw.isfixed = True;
4041                 break;
4042         case 'o':
4043                 opt_io = EARGF(usage());
4044                 break;
4045         case 't':
4046                 opt_title = EARGF(usage());
4047                 break;
4048         case 'w':
4049                 opt_embed = EARGF(usage());
4050                 break;
4051         case 'v':
4052         default:
4053                 usage();
4054         } ARGEND;
4055
4056 run:
4057         setlocale(LC_CTYPE, "");
4058         XSetLocaleModifiers("");
4059         tnew(MAX(cols, 1), MAX(rows, 1));
4060         xinit();
4061         selinit();
4062         run();
4063
4064         return 0;
4065 }
4066