lib/mkdir.c

   1 /* On some systems, mkdir ("foo/", 0700) fails because of the trailing
   2    slash.  On those systems, this wrapper removes the trailing slash.
   3
   4    Copyright (C) 2001, 2003, 2006, 2008-2024 Free Software Foundation, Inc.
   5
   6    This file is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU Lesser General Public License as
   8    published by the Free Software Foundation; either version 2.1 of the
   9    License, or (at your option) any later version.
  10
  11    This file is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  18
  19 /* written by Jim Meyering */
  20
  21 #include <config.h>
  22
  23 /* Specification.  */
  24 #include <sys/stat.h>
  25
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "dirname.h"
  32
  33 /* Disable the definition of mkdir to rpl_mkdir (from the <sys/stat.h>
  34    substitute) in this file.  Otherwise, we'd get an endless recursion.  */
  35 #undef mkdir
  36
  37 /* mingw's _mkdir() function has 1 argument, but we pass 2 arguments.
  38    Additionally, it declares _mkdir (and depending on compile flags, an
  39    alias mkdir), only in the nonstandard includes <direct.h> and <io.h>,
  40    which are included in the <sys/stat.h> override.  */
  41 #if defined _WIN32 && ! defined __CYGWIN__
  42 # define mkdir(name,mode) _mkdir (name)
  43 # define maybe_unused _GL_UNUSED
  44 #else
  45 # define maybe_unused /* empty */
  46 #endif
  47
  48 /* This function is required at least for NetBSD 1.5.2.  */
  49
  50 int
  51 rpl_mkdir (char const *dir, maybe_unused mode_t mode)
  52 {
  53   int ret_val;
  54   char *tmp_dir;
  55   size_t len = strlen (dir);
  56
  57   if (len && dir[len - 1] == '/')
  58     {
  59       tmp_dir = strdup (dir);
  60       if (!tmp_dir)
  61         {
  62           /* Rather than rely on strdup-posix, we set errno ourselves.  */
  63           errno = ENOMEM;
  64           return -1;
  65         }
  66       strip_trailing_slashes (tmp_dir);
  67     }
  68   else
  69     {
  70       tmp_dir = (char *) dir;
  71     }
  72 #if FUNC_MKDIR_DOT_BUG
  73   /* Additionally, cygwin 1.5 mistakenly creates a directory "d/./".  */
  74   {
  75     char *last = last_component (tmp_dir);
  76     if (*last == '.' && (last[1] == '\0'
  77                          || (last[1] == '.' && last[2] == '\0')))
  78       {
  79         struct stat st;
  80         if (stat (tmp_dir, &st) == 0 || errno == EOVERFLOW)
  81           errno = EEXIST;
  82         return -1;
  83       }
  84   }
  85 #endif /* FUNC_MKDIR_DOT_BUG */
  86
  87   ret_val = mkdir (tmp_dir, mode);
  88
  89   if (tmp_dir != dir)
  90     free (tmp_dir);
  91
  92   return ret_val;
  93 }