1 files changed, 23 insertions, 9 deletions

diff --git a/cmp.c b/cmp.c
index 24b6c3f92..6d579461d 100644
--- a/cmp.c
+++ b/cmp.c
@@ -26,28 +26,42 @@
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <getopt.h>
 #include "busybox.h"
 
 int cmp_main(int argc, char **argv)
 {
         FILE *fp1 = NULL, *fp2 = stdin;
-        char *filename1 = argv[1], *filename2 = "-";
-        int c1, c2, char_pos = 1, line_pos = 1;
+        char *filename1, *filename2 = "-";
+        int c, c1, c2, char_pos = 1, line_pos = 1, silent = FALSE;
 
-        /* parse argv[] */
-        if (argc < 2 || 3 < argc)
-                show_usage();
+        while ((c = getopt(argc, argv, "s")) != EOF) {
+                switch (c) {
+                        case 's':
+                                silent = TRUE;
+                                break;
+                        default:
+                                show_usage();
+                }
+        }
 
-        fp1 = xfopen(argv[1], "r");
-        if (argv[2] != NULL) {
-                fp2 = xfopen(argv[2], "r");
-                filename2 = argv[2];
+        filename1 = argv[optind];
+        switch (argc - optind) {
+                case 2:
+                        fp2 = xfopen(filename2 = argv[optind + 1], "r");
+                case 1:
+                        fp1 = xfopen(filename1, "r");
+                        break;
+                default:
+                        show_usage();
         }
 
         do {
                 c1 = fgetc(fp1);
                 c2 = fgetc(fp2);
                 if (c1 != c2) {
+                        if (silent)
+                                return EXIT_FAILURE;
                         if (c1 == EOF)
                                 printf("EOF on %s\n", filename1);
                         else if (c2 == EOF)