Mild const-correctness improvements.

Only touch a few things, the main focus is to
improve code readability.

diff --git a/st.c b/st.c
index abbbe4b86c44bbe29660e1a2beaea022b145a992..ebdf3609b6a8eb6605791a91894868175b0ecc86 100644 (file)
--- a/st.c
+++ b/st.c
@@ -186,18 +186,18 @@ static void tputc(Rune);
 static void treset(void);
 static void tscrollup(int, int);
 static void tscrolldown(int, int);
-static void tsetattr(int *, int);
-static void tsetchar(Rune, Glyph *, int, int);
+static void tsetattr(const int *, int);
+static void tsetchar(Rune, const Glyph *, int, int);
 static void tsetdirt(int, int);
 static void tsetscroll(int, int);
 static void tswapscreen(void);
-static void tsetmode(int, int, int *, int);
+static void tsetmode(int, int, const int *, int);
 static int twrite(const char *, int, int);
 static void tfulldirt(void);
 static void tcontrolcode(uchar );
 static void tdectest(char );
 static void tdefutf8(char);
-static int32_t tdefcolor(int *, int *, int);
+static int32_t tdefcolor(const int *, int *, int);
 static void tdeftran(char);
 static void tstrsequence(uchar);
 
@@ -226,10 +226,10 @@ static int iofd = 1;
 static int cmdfd;
 static pid_t pid;
 
-static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
-static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
-static Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
-static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
+static const uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
+static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
+static const Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
+static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 
 ssize_t
 xwrite(int fd, const char *s, size_t len)
@@ -269,12 +269,14 @@ xrealloc(void *p, size_t len)
 }
 
 char *
-xstrdup(char *s)
+xstrdup(const char *s)
 {
-       if ((s = strdup(s)) == NULL)
+       char *p;
+
+       if ((p = strdup(s)) == NULL)
                die("strdup: %s\n", strerror(errno));
 
-       return s;
+       return p;
 }
 
 size_t
@@ -518,7 +520,7 @@ selsnap(int *x, int *y, int direction)
 {
        int newx, newy, xt, yt;
        int delim, prevdelim;
-       Glyph *gp, *prevgp;
+       const Glyph *gp, *prevgp;
 
        switch (sel.snap) {
        case SNAP_WORD:
@@ -591,7 +593,7 @@ getsel(void)
 {
        char *str, *ptr;
        int y, bufsize, lastx, linelen;
-       Glyph *gp, *last;
+       const Glyph *gp, *last;
 
        if (sel.ob.x == -1)
                return NULL;
@@ -758,7 +760,7 @@ stty(char **args)
 }
 
 int
-ttynew(char *line, char *cmd, char *out, char **args)
+ttynew(const char *line, char *cmd, const char *out, char **args)
 {
        int m, s;
 
@@ -1186,9 +1188,9 @@ tmoveto(int x, int y)
 }
 
 void
-tsetchar(Rune u, Glyph *attr, int x, int y)
+tsetchar(Rune u, const Glyph *attr, int x, int y)
 {
-       static char *vt100_0[62] = { /* 0x41 - 0x7e */
+       static const char *vt100_0[62] = { /* 0x41 - 0x7e */
                "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
                0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
                0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
@@ -1300,7 +1302,7 @@ tdeleteline(int n)
 }
 
 int32_t
-tdefcolor(int *attr, int *npar, int l)
+tdefcolor(const int *attr, int *npar, int l)
 {
        int32_t idx = -1;
        uint r, g, b;
@@ -1350,7 +1352,7 @@ tdefcolor(int *attr, int *npar, int l)
 }
 
 void
-tsetattr(int *attr, int l)
+tsetattr(const int *attr, int l)
 {
        int i;
        int32_t idx;
@@ -1468,9 +1470,9 @@ tsetscroll(int t, int b)
 }
 
 void
-tsetmode(int priv, int set, int *args, int narg)
+tsetmode(int priv, int set, const int *args, int narg)
 {
-       int alt, *lim;
+       int alt; const int *lim;
 
        for (lim = args + narg; args < lim; ++args) {
                if (priv) {
@@ -2020,7 +2022,7 @@ void
 tdumpline(int n)
 {
        char buf[UTF_SIZ];
-       Glyph *bp, *end;
+       const Glyph *bp, *end;
 
        bp = &term.line[n][0];
        end = &bp[MIN(tlinelen(n), term.col) - 1];

diff --git a/st.h b/st.h
index 3d351b69ea3746bf80de58a1ce1a2b2a4dc30ba5..fa2eddff864f5be9382b2477ddfd630d0f76e4c8 100644 (file)
--- a/st.h
+++ b/st.h
@@ -91,7 +91,7 @@ void tnew(int, int);
 void tresize(int, int);
 void tsetdirtattr(int);
 void ttyhangup(void);
-int ttynew(char *, char *, char *, char **);
+int ttynew(const char *, char *, const char *, char **);
 size_t ttyread(void);
 void ttyresize(int, int);
 void ttywrite(const char *, size_t, int);
@@ -109,7 +109,7 @@ size_t utf8encode(Rune, char *);
 
 void *xmalloc(size_t);
 void *xrealloc(void *, size_t);
-char *xstrdup(char *);
+char *xstrdup(const char *);
 
 /* config.h globals */
 extern char *utmp;

diff --git a/x.c b/x.c
index 8bf998e1dedb7ad592a03b985db2e606f9523ec9..718604067917b7b470a1618cedc72da379ebee37 100644 (file)
--- a/x.c
+++ b/x.c
@@ -156,7 +156,7 @@ static void xresize(int, int);
 static void xhints(void);
 static int xloadcolor(int, const char *, Color *);
 static int xloadfont(Font *, FcPattern *);
-static void xloadfonts(char *, double);
+static void xloadfonts(const char *, double);
 static void xunloadfont(Font *);
 static void xunloadfonts(void);
 static void xsetenv(void);
@@ -952,7 +952,7 @@ xloadfont(Font *f, FcPattern *pattern)
 }
 
 void
-xloadfonts(char *fontstr, double fontsize)
+xloadfonts(const char *fontstr, double fontsize)
 {
        FcPattern *pattern;
        double fontval;
@@ -960,7 +960,7 @@ xloadfonts(char *fontstr, double fontsize)
        if (fontstr[0] == '-')
                pattern = XftXlfdParse(fontstr, False, False);
        else
-               pattern = FcNameParse((FcChar8 *)fontstr);
+               pattern = FcNameParse((const FcChar8 *)fontstr);
 
        if (!pattern)
                die("can't open font %s\n", fontstr);