losetup: getopt_ulflags'ification + small fix for perror_nomsg

1 files changed, 35 insertions, 33 deletions

diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index 3c979840f..af0b03a53 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -12,39 +12,41 @@
 
 #include "busybox.h"
 
-int losetup_main (int argc, char **argv)
+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);
+	unsigned long opt;
+	char *opt_o;
+	int offset = 0;
+
+	opt = bb_getopt_ulflags(argc, argv, "do:", &opt_o);
+	argc -= optind;
+	argv += optind;
+
+	if (opt == 0x3) bb_show_usage(); // -d and -o (illegal)
+
+	if (opt == 0x1) { // -d
+		/* detach takes exactly one argument */
+		if (argc != 1)
+			bb_show_usage();
+		if (!del_loop(argv[0]))
+			return EXIT_SUCCESS;
+		bb_perror_nomsg_and_die();
+	}
+
+	if (opt == 0x2) // -o
+		offset = bb_xparse_number(opt_o, NULL);
+
+	/* -o or no option */
+
+	if (argc == 2) {
+		if (set_loop(&argv[0], argv[1], offset) < 0)
+			bb_perror_nomsg_and_die();
+	} else if (argc == 1) {
+		char *s = query_loop(argv[0]);
+		if (!s) bb_perror_nomsg_and_die();
+		printf("%s: %s\n", argv[0], s);
+		if (ENABLE_FEATURE_CLEAN_UP) free(s);
+	} else
+		bb_show_usage();
 	return EXIT_SUCCESS;
-      }
-      break;
-  }
-  bb_show_usage();
-  return EXIT_FAILURE;
 }