Eliminating the getopt disgrace.

tee.c

@@ -5,38 +5,49 @@
 #include <unistd.h>
 #include "util.h"
 
+static void
+usage(void)
+{
+	eprintf("usage: %s [-a] [file...]\n", argv0);
+	exit(1);
+}
+
 int
 main(int argc, char *argv[])
 {
 	bool aflag = false;
-	char buf[BUFSIZ], c;
+	char buf[BUFSIZ];
 	int i, nfps = 1;
 	size_t n;
 	FILE **fps;
 
-	while((c = getopt(argc, argv, "a")) != -1)
-		switch(c) {
-		case 'a':
-			aflag = true;
-			break;
-		default:
-			exit(EXIT_FAILURE);
-		}
+	ARGBEGIN {
+	case 'a':
+		aflag = true;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
 	if(!(fps = malloc(sizeof *fps)))
 		eprintf("malloc:");
 	fps[nfps-1] = stdout;
 
-	for(; optind < argc; optind++) {
+	for(; argc > 0; argc--, argv++) {
 		if(!(fps = realloc(fps, ++nfps * sizeof *fps)))
 			eprintf("realloc:");
-		if(!(fps[nfps-1] = fopen(argv[optind], aflag ? "a" : "w")))
-			eprintf("fopen %s:", argv[optind]);
+		if(!(fps[nfps-1] = fopen(argv[0], aflag ? "a" : "w")))
+			eprintf("fopen %s:", argv[0]);
 	}
-	while((n = fread(buf, 1, sizeof buf, stdin)) > 0)
-		for(i = 0; i < nfps; i++)
+	while((n = fread(buf, 1, sizeof buf, stdin)) > 0) {
+		for(i = 0; i < nfps; i++) {
 			if(fwrite(buf, 1, n, fps[i]) != n)
 				eprintf("%s: write error:", buf);
+		}
+	}
 	if(ferror(stdin))
 		eprintf("<stdin>: read error:");
-	return EXIT_SUCCESS;
+
+	return 0;
 }
+