Add "-" support to comm(1)

comm.c

@@ -41,6 +41,8 @@ main(int argc, char *argv[])
 		usage();
 
 	for(i = 0; i < LEN(fp); i++) {
+		if (argv[i][0] == '-')
+			argv[i] = "/dev/fd/0";
 		if(!(fp[i] = fopen(argv[i], "r")))
 			eprintf("comm: '%s':", argv[i]);
 	}
@@ -89,7 +91,6 @@ nextline(char *buf, int n, FILE *f, char *name)
 		eprintf("comm: '%s':", name);
 	if(buf && !strchr(buf, '\n'))
 		eprintf("comm: '%s': line too long.\n", name);
-
 	return buf;
 }
 
@@ -100,6 +101,5 @@ finish(int pos, FILE *f, char *name)
 
 	while(nextline(buf, sizeof(buf), f, name))
 		printline(pos, buf);
-
 	exit(1);
 }