src/fstab-decode.c

   1 /* fstab-decode(8).
   2
   3 Copyright (c) 2006 Red Hat, Inc. All rights reserved.
   4
   5 This copyrighted material is made available to anyone wishing to use, modify,
   6 copy, or redistribute it subject to the terms and conditions of the GNU General
   7 Public License v.2.
   8
   9 This program is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
  11 PARTICULAR PURPOSE. See the GNU General Public License for more details.
  12
  13 You should have received a copy of the GNU General Public License along with
  14 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
  15 Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16
  17 Author: Miloslav Trmac <mitr@redhat.com> */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 /* Decode the fstab-encoded string in place. */
  26 static void
  27 decode(char *s)
  28 {
  29         const char *src;
  30         char *dest;
  31
  32         src = s;
  33         dest = s;
  34         while (*src != '\0') {
  35                 if (*src != '\\')
  36                         *dest = *src++;
  37                 else {
  38                         static const struct repl {
  39                                 char orig[4];
  40                                 size_t len;
  41                                 char new;
  42                         } repls[] = {
  43 #define R(X, Y) { X, sizeof(X) - 1, Y }
  44                                 R("\\", '\\'),
  45                                 R("011", '\t'),
  46                                 R("012", '\n'),
  47                                 R("040", ' '),
  48                                 R("134", '\\')
  49 #undef R
  50                         };
  51
  52                         size_t i;
  53
  54                         for (i = 0; i < sizeof (repls) / sizeof (repls[0]);
  55                              i++) {
  56                                 if (memcmp(src + 1, repls[i].orig,
  57                                            repls[i].len) == 0) {
  58                                         *dest = repls[i].new;
  59                                         src += 1 + repls[i].len;
  60                                         goto found;
  61                                 }
  62                         }
  63                         *dest = *src++;
  64                 found:
  65                         ;
  66                 }
  67                 dest++;
  68         }
  69         *dest = '\0';
  70 }
  71
  72 int
  73 main (int argc, char *argv[])
  74 {
  75         size_t i;
  76
  77         if (argc < 2) {
  78                 fprintf(stderr, "Usage: fstab-decode command [arguments]\n");
  79                 return EXIT_FAILURE;
  80         }
  81         for (i = 2; i < (size_t)argc; i++)
  82                 decode(argv[i]);
  83         execvp(argv[1], argv + 1);
  84         fprintf(stderr, "fstab-decode: %s: %s\n", argv[1], strerror(errno));
  85         return 127;
  86 }