Eliminated seeks so that we work correctly on pipes, and removed reliance on

[oweals/busybox.git] / gunzip.c

diff --git a/gunzip.c b/gunzip.c
index 246ce2f4e7b6a39d0dd99db8915ac83aaeb79e19..c3960e953221193bd5cc6fefd7559a6db25a3ae2 100644 (file)
--- a/gunzip.c
+++ b/gunzip.c
@@ -60,9 +60,6 @@ static char *license_msg[] = {
 };
 #endif
 
-//#include <sys/types.h>
-//#include <sys/wait.h>
-//#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -93,37 +90,42 @@ extern int gunzip_main(int argc, char **argv)
 
        /* if called as zcat */
        if (strcmp(applet_name, "zcat") == 0) {
-               if (argc != 2) {
+               if (argc > 2) {
                        show_usage();
                }
-               optind = 1;
-               flags |= (gunzip_force | gunzip_to_stdout);
+               else if (argc == 2) {
+                       /* a filename was specified */
+                       flags |= (gunzip_to_stdout | gunzip_force);
+                       optind = 1;
+               } else {
+                       /* read from stdin, this gets caught below as argv[optind] will be NULL */
+                       optind = argc;
+               }
        } else {
                /* workout flags as regular gunzip */
-               /* set default flags */
-               if (argc == 1) {
-                       flags |= (gunzip_from_stdin | gunzip_to_stdout);
-               } else {
-                       /* Parse any options */
-                       while ((opt = getopt(argc, argv, "ctfh")) != -1) {
-                               switch (opt) {
-                               case 'c':
-                                       flags |= gunzip_to_stdout;
-                                       break;
-                               case 'f':
-                                       flags |= gunzip_force;
-                                       break;
-                               case 't':
-                                       flags |= gunzip_test;
-                                       break;
-                               case 'h':
-                               default:
-                                       show_usage(); /* exit's inside usage */
-                               }
+               while ((opt = getopt(argc, argv, "ctfh")) != -1) {
+                       switch (opt) {
+                       case 'c':
+                               flags |= gunzip_to_stdout;
+                               break;
+                       case 'f':
+                               flags |= gunzip_force;
+                               break;
+                       case 't':
+                               flags |= gunzip_test;
+                               break;
+                       case 'h':
+                       default:
+                               show_usage(); /* exit's inside usage */
                        }
                }
        }
 
+       /* no filename specified so it must be reading from stdin to stdout */
+       if (argv[optind] == NULL) {
+               flags |= (gunzip_from_stdin |gunzip_to_stdout |gunzip_force);
+       }
+
        /* Set input filename and number */
        if (flags & gunzip_from_stdin) {
                in_file = stdin;