From b3c96cc961404fea566c2cdde320008a33984284 Mon Sep 17 00:00:00 2001
From: Armaan Bhojwani <me@armaanb.net>
Date: Sat, 15 May 2021 10:42:11 -0400
Subject: [PATCH] morse: add program

Converts ASCII input to morse code
---
 morse.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 morse.c

diff --git a/morse.c b/morse.c
new file mode 100644
index 0000000..27e0fa6
--- /dev/null
+++ b/morse.c
@@ -0,0 +1,56 @@
+/* Convert ASCII to morse code. Reads from stdin if provided with no argument
+	 or "-", otherwise reads from the first command line argument. Prints "*" if
+	 character is not found. */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+const char *aa[] = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l",
+	"m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "1",
+	"2", "3", "4", "5", "6", "7", "8", "9", "0", " "};
+
+const char *ma[] = {"•-", "-•••", "-•-•", "-••", "•", "••-•", "--•", "••••",
+	"••", "•---", "-•-", "•-••", "--", "-•", "---", "•--•", "--•-", "•-•", "•••",
+	"-", "•--", "•••-", "•--", "-••-", "-•--", "--••", "•----", "••---", "•••--",
+	"••••-", "•••••", "-••••", "--•••", "---••", "----•", "-----", "   "};
+
+void
+convert(char *c)
+{
+	if (strcmp(c, "\n") == 0) {
+		printf("\n");
+		return;
+	}
+
+	for (int i = 0; aa[i]; i++) {
+		if (strcmp(c, aa[i]) == 0) {
+			printf("%s", ma[i]);
+			break;
+		} else if (i == sizeof(aa)/sizeof(char *) - 1) {
+			printf("*");
+		}
+	}
+	printf(" ");
+}
+
+int
+main(int argc, char **argv)
+{
+	char c[2];
+	c[1] = '\0';
+
+	if (argv[1] && strcmp(argv[1], "-") != 0) {
+		for (int i = 0; argv[1][i]; i++) {
+			c[0] = argv[1][i];
+			convert(c);
+		}
+	} else {
+		while (read(STDIN_FILENO, &c[0], 1) > 0) {
+			convert(c);
+		}
+	}
+	printf("\n");
+	return 0;
+}
-- 
2.39.2