src/basic/glob-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   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 systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <dirent.h>
  21 #include <errno.h>
  22 #include <glob.h>
  23 #include <sys/types.h>
  24
  25 #include "dirent-util.h"
  26 #include "glob-util.h"
  27 #include "macro.h"
  28 #include "path-util.h"
  29 #include "strv.h"
  30
  31 int safe_glob(const char *path, int flags, glob_t *pglob) {
  32         int k;
  33
  34         /* We want to set GLOB_ALTDIRFUNC ourselves, don't allow it to be set. */
  35         assert(!(flags & GLOB_ALTDIRFUNC));
  36
  37         if (!pglob->gl_closedir)
  38                 pglob->gl_closedir = (void (*)(void *)) closedir;
  39         if (!pglob->gl_readdir)
  40                 pglob->gl_readdir = (struct dirent *(*)(void *)) readdir_no_dot;
  41         if (!pglob->gl_opendir)
  42                 pglob->gl_opendir = (void *(*)(const char *)) opendir;
  43         if (!pglob->gl_lstat)
  44                 pglob->gl_lstat = lstat;
  45         if (!pglob->gl_stat)
  46                 pglob->gl_stat = stat;
  47
  48         errno = 0;
  49         k = glob(path, flags | GLOB_ALTDIRFUNC, NULL, pglob);
  50
  51         if (k == GLOB_NOMATCH)
  52                 return -ENOENT;
  53         if (k == GLOB_NOSPACE)
  54                 return -ENOMEM;
  55         if (k != 0)
  56                 return errno > 0 ? -errno : -EIO;
  57         if (strv_isempty(pglob->gl_pathv))
  58                 return -ENOENT;
  59
  60         return 0;
  61 }
  62
  63 int glob_exists(const char *path) {
  64         _cleanup_globfree_ glob_t g = {};
  65         int k;
  66
  67         assert(path);
  68
  69         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  70         if (k == -ENOENT)
  71                 return false;
  72         if (k < 0)
  73                 return k;
  74         return true;
  75 }
  76
  77 int glob_extend(char ***strv, const char *path) {
  78         _cleanup_globfree_ glob_t g = {};
  79         int k;
  80
  81         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  82         if (k < 0)
  83                 return k;
  84
  85         return strv_extend_strv(strv, g.gl_pathv, false);
  86 }