lib/util/mkdir_p.c

   1 /*
   2    mkdir -p
   3
   4    Copyright (C) Amitay Isaacs  2014
   5    Copyright (C) Martin Schwenke  2014
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20 #include "replace.h"
  21 #include <sys/stat.h>
  22 #include <libgen.h>
  23 #include "mkdir_p.h"
  24
  25 int mkdir_p(const char *dir, int mode)
  26 {
  27         char t[PATH_MAX];
  28         ssize_t len;
  29         int ret;
  30
  31         if (strcmp(dir, "/") == 0) {
  32                 return 0;
  33         }
  34
  35         if (strcmp(dir, ".") == 0) {
  36                 return 0;
  37         }
  38
  39         /* Try to create directory */
  40         ret = mkdir(dir, mode);
  41         /* Succeed if that worked or if it already existed */
  42         if (ret == 0 || errno == EEXIST) {
  43                 return 0;
  44         }
  45         /* Fail on anything else except ENOENT */
  46         if (errno != ENOENT) {
  47                 return ret;
  48         }
  49
  50         /* Create ancestors */
  51         len = strlen(dir);
  52         ret = snprintf(t, sizeof(t), "%s", dir);
  53         if (ret != len) {
  54                 errno = ENAMETOOLONG;
  55                 return -1;
  56         }
  57
  58         ret = mkdir_p(dirname(t), mode);
  59         if (ret != 0) {
  60                 return ret;
  61         }
  62
  63         /* Create directory */
  64         ret = mkdir(dir, mode);
  65         if ((ret == -1) && (errno == EEXIST)) {
  66                 ret = 0;
  67         }
  68
  69         return ret;
  70 }