src/basic/glob-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <dirent.h>
   4 #include <errno.h>
   5 #include <glob.h>
   6 #include <sys/types.h>
   7
   8 #include "dirent-util.h"
   9 #include "glob-util.h"
  10 #include "macro.h"
  11 #include "path-util.h"
  12 #include "strv.h"
  13
  14 static void closedir_wrapper(void* v) {
  15         (void) closedir(v);
  16 }
  17
  18 int safe_glob(const char *path, int flags, glob_t *pglob) {
  19         int k;
  20
  21         /* We want to set GLOB_ALTDIRFUNC ourselves, don't allow it to be set. */
  22         assert(!(flags & GLOB_ALTDIRFUNC));
  23
  24         if (!pglob->gl_closedir)
  25                 pglob->gl_closedir = closedir_wrapper;
  26         if (!pglob->gl_readdir)
  27                 pglob->gl_readdir = (struct dirent *(*)(void *)) readdir_no_dot;
  28         if (!pglob->gl_opendir)
  29                 pglob->gl_opendir = (void *(*)(const char *)) opendir;
  30         if (!pglob->gl_lstat)
  31                 pglob->gl_lstat = lstat;
  32         if (!pglob->gl_stat)
  33                 pglob->gl_stat = stat;
  34
  35         errno = 0;
  36         k = glob(path, flags | GLOB_ALTDIRFUNC, NULL, pglob);
  37
  38         if (k == GLOB_NOMATCH)
  39                 return -ENOENT;
  40         if (k == GLOB_NOSPACE)
  41                 return -ENOMEM;
  42         if (k != 0)
  43                 return errno > 0 ? -errno : -EIO;
  44         if (strv_isempty(pglob->gl_pathv))
  45                 return -ENOENT;
  46
  47         return 0;
  48 }
  49
  50 int glob_exists(const char *path) {
  51         _cleanup_globfree_ glob_t g = {};
  52         int k;
  53
  54         assert(path);
  55
  56         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  57         if (k == -ENOENT)
  58                 return false;
  59         if (k < 0)
  60                 return k;
  61         return true;
  62 }
  63
  64 int glob_extend(char ***strv, const char *path) {
  65         _cleanup_globfree_ glob_t g = {};
  66         int k;
  67
  68         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  69         if (k < 0)
  70                 return k;
  71
  72         return strv_extend_strv(strv, g.gl_pathv, false);
  73 }