support/xmkdirp.c

   1 /* Error-checking replacement for "mkdir -p".
   2    Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/support.h>
  20 #include <support/check.h>
  21 #include <support/xunistd.h>
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 /* Equivalent of "mkdir -p".  Any failures cause FAIL_EXIT1 so no
  28    return code is needed.  */
  29
  30 void
  31 xmkdirp (const char *path, mode_t mode)
  32 {
  33   struct stat s;
  34   const char *slash_p;
  35   int rv;
  36
  37   if (path[0] == 0)
  38     return;
  39
  40   if (stat (path, &s) == 0)
  41     {
  42       if (S_ISDIR (s.st_mode))
  43         return;
  44       errno = EEXIST;
  45       FAIL_EXIT1 ("mkdir_p (\"%s\", 0%o): %m", path, mode);
  46     }
  47
  48   slash_p = strrchr (path, '/');
  49   if (slash_p != NULL)
  50     {
  51       while (slash_p > path && slash_p[-1] == '/')
  52         --slash_p;
  53       if (slash_p > path)
  54         {
  55           char *parent = xstrndup (path, slash_p - path);
  56           xmkdirp (parent, mode);
  57           free (parent);
  58         }
  59     }
  60
  61   rv = mkdir (path, mode);
  62   if (rv != 0)
  63     FAIL_EXIT1 ("mkdir_p (\"%s\", 0%o): %m", path, mode);
  64
  65   return;
  66 }