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[oweals/busybox.git] / util-linux / losetup.c

diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 44721bd346f621d332b9cf80526215ca98310945..d521b7b88c42443adf2f103496cf5e915fdb382b 100644 (file)
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -1,62 +1,81 @@
+/* vi: set sw=4 ts=4: */
 /*
  * Mini losetup implementation for busybox
  *
  * Copyright (C) 2002  Matt Kraai.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
 #include <getopt.h>
-#include <stdlib.h>
 
-#include "busybox.h"
+#include "libbb.h"
 
-int losetup_main (int argc, char **argv)
+int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int losetup_main(int argc, char **argv)
 {
-  int offset = 0;
-
-  /* This will need a "while(getopt()!=-1)" loop when we can have more than
-     one option, but for now we can't. */
-  switch(getopt(argc,argv, "do:")) {
-    case 'd':
-      /* detach takes exactly one argument */
-      if(optind+1!=argc) bb_show_usage();
-      if(!del_loop(argv[optind])) return EXIT_SUCCESS;
-die_failed:
-      bb_perror_msg_and_die("%s",argv[optind]);
-
-    case 'o':
-      offset = bb_xparse_number (optarg, NULL);
-      /* Fall through to do the losetup */
-    case -1:
-      /* losetup takes two argument:, loop_device and file */
-      if(optind+2==argc) {
-        if(set_loop(&argv[optind], argv[optind + 1], offset)>=0)
-          return EXIT_SUCCESS;
-        else goto die_failed;
-      }
-      if(optind+1==argc) {
-        char *s=query_loop(argv[optind]);
-        if (!s) goto die_failed;
-        printf("%s: %s\n",argv[optind],s);
-        if(ENABLE_FEATURE_CLEAN_UP) free(s);
-        return EXIT_SUCCESS;
-      }
-      break;
-  }
-  bb_show_usage();
-  return EXIT_FAILURE;
+       char dev[] = LOOP_NAME"0";
+       unsigned opt;
+       char *opt_o;
+       char *s;
+       unsigned long long offset = 0;
+
+       /* max 2 args, all opts are mutially exclusive */
+       opt_complementary = "?2:d--of:o--df:f-do";
+       opt = getopt32(argv, "do:f", &opt_o);
+       argc -= optind;
+       argv += optind;
+
+       if (opt == 0x2) // -o
+               offset = xatoull(opt_o);
+
+       if (opt == 0x4 && argc) // -f does not take any argument
+               bb_show_usage();
+
+       if (opt == 0x1) { // -d
+               /* detach takes exactly one argument */
+               if (argc != 1)
+                       bb_show_usage();
+               if (del_loop(argv[0]))
+                       bb_simple_perror_msg_and_die(argv[0]);
+               return EXIT_SUCCESS;
+       }
+
+       if (argc == 2) {
+               /* -o or no option */
+               if (set_loop(&argv[0], argv[1], offset) < 0)
+                       bb_simple_perror_msg_and_die(argv[0]);
+               return EXIT_SUCCESS;
+       }
+
+       if (argc == 1) {
+               /* -o or no option */
+               s = query_loop(argv[0]);
+               if (!s)
+                       bb_simple_perror_msg_and_die(argv[0]);
+               printf("%s: %s\n", argv[0], s);
+               if (ENABLE_FEATURE_CLEAN_UP)
+                       free(s);
+               return EXIT_SUCCESS;
+       }
+
+       /* -o, -f or no option */
+       while (1) {
+               s = query_loop(dev);
+               if (!s) {
+                       if (opt == 0x4) {
+                               puts(dev);
+                               return EXIT_SUCCESS;
+                       }
+               } else {
+                       if (opt != 0x4)
+                               printf("%s: %s\n", dev, s);
+                       if (ENABLE_FEATURE_CLEAN_UP)
+                               free(s);
+               }
+
+               if (++dev[sizeof(dev) - 2] > '9')
+                       break;
+       }
+       return EXIT_SUCCESS;
 }