X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=util-linux%2Flosetup.c;h=21108d0bfb372fced9e0925ebd1a0037b12c21d4;hb=93c32f2dd2b9d7c06bc46be8adac704c08929da8;hp=44721bd346f621d332b9cf80526215ca98310945;hpb=ce88793698eb7d53034ff4489f6d484f2b03f8ce;p=oweals%2Fbusybox.git

diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 44721bd34..21108d0bf 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -1,62 +1,107 @@
+/* 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 source tree.
  */
 
-#include <getopt.h>
-#include <stdlib.h>
+//usage:#define losetup_trivial_usage
+//usage:       "[-r] [-o OFS] LOOPDEV FILE - associate loop devices\n"
+//usage:       "	losetup -d LOOPDEV - disassociate\n"
+//usage:       "	losetup [-f] - show"
+//usage:#define losetup_full_usage "\n\n"
+//usage:       "	-o OFS	Start OFS bytes into FILE"
+//usage:     "\n	-r	Read-only"
+//usage:     "\n	-f	Show first free loop device"
+//usage:
+//usage:#define losetup_notes_usage
+//usage:       "No arguments will display all current associations.\n"
+//usage:       "One argument (losetup /dev/loop1) will display the current association\n"
+//usage:       "(if any), or disassociate it (with -d). The display shows the offset\n"
+//usage:       "and filename of the file the loop device is currently bound to.\n\n"
+//usage:       "Two arguments (losetup /dev/loop1 file.img) create a new association,\n"
+//usage:       "with an optional offset (-o 12345). Encryption is not yet supported.\n"
+//usage:       "losetup -f will show the first loop free loop device\n\n"
 
-#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 UNUSED_PARAM, 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;
+	unsigned opt;
+	int n;
+	char *opt_o;
+	unsigned long long offset = 0;
+	enum {
+		OPT_d = (1 << 0),
+		OPT_o = (1 << 1),
+		OPT_f = (1 << 2),
+		OPT_r = (1 << 3), /* must be last */
+	};
+
+	/* max 2 args, -d,-o,-f opts are mutually exclusive */
+	opt_complementary = "?2:d--of:o--df:f--do";
+	opt = getopt32(argv, "do:fr", &opt_o);
+	argv += optind;
+
+	if (opt == OPT_o)
+		offset = xatoull(opt_o);
+
+	if (opt == OPT_d) {
+		/* -d BLOCKDEV */
+		if (!argv[0] || argv[1])
+			bb_show_usage();
+		if (del_loop(argv[0]))
+			bb_simple_perror_msg_and_die(argv[0]);
+		return EXIT_SUCCESS;
+	}
+
+	if (argv[0]) {
+		char *s;
+
+		if (opt == OPT_f) /* -f should not have arguments */
+			bb_show_usage();
+
+		if (argv[1]) {
+			/* [-r] [-o OFS] BLOCKDEV FILE */
+			if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0)
+				bb_simple_perror_msg_and_die(argv[0]);
+			return EXIT_SUCCESS;
+		}
+		/* [-r] [-o OFS] BLOCKDEV */
+		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;
+	}
+
+	/* [-r] [-o OFS|-f] with no params */
+	n = 0;
+	while (1) {
+		char *s;
+		char dev[LOOP_NAMESIZE];
+
+		sprintf(dev, LOOP_FORMAT, n);
+		s = query_loop(dev);
+		n++;
+		if (!s) {
+			if (n > 9 && errno && errno != ENXIO)
+				return EXIT_SUCCESS;
+			if (opt == OPT_f) {
+				puts(dev);
+				return EXIT_SUCCESS;
+			}
+		} else {
+			if (opt != OPT_f)
+				printf("%s: %s\n", dev, s);
+			if (ENABLE_FEATURE_CLEAN_UP)
+				free(s);
+		}
+	}
+	return EXIT_SUCCESS;
 }