src/basic/glob-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6 ***/
   7
   8 #include <dirent.h>
   9 #include <errno.h>
  10 #include <glob.h>
  11 #include <sys/types.h>
  12
  13 #include "dirent-util.h"
  14 #include "glob-util.h"
  15 #include "macro.h"
  16 #include "path-util.h"
  17 #include "strv.h"
  18
  19 static void closedir_wrapper(void* v) {
  20         (void) closedir(v);
  21 }
  22
  23 int safe_glob(const char *path, int flags, glob_t *pglob) {
  24         int k;
  25
  26         /* We want to set GLOB_ALTDIRFUNC ourselves, don't allow it to be set. */
  27         assert(!(flags & GLOB_ALTDIRFUNC));
  28
  29         if (!pglob->gl_closedir)
  30                 pglob->gl_closedir = closedir_wrapper;
  31         if (!pglob->gl_readdir)
  32                 pglob->gl_readdir = (struct dirent *(*)(void *)) readdir_no_dot;
  33         if (!pglob->gl_opendir)
  34                 pglob->gl_opendir = (void *(*)(const char *)) opendir;
  35         if (!pglob->gl_lstat)
  36                 pglob->gl_lstat = lstat;
  37         if (!pglob->gl_stat)
  38                 pglob->gl_stat = stat;
  39
  40         errno = 0;
  41         k = glob(path, flags | GLOB_ALTDIRFUNC, NULL, pglob);
  42
  43         if (k == GLOB_NOMATCH)
  44                 return -ENOENT;
  45         if (k == GLOB_NOSPACE)
  46                 return -ENOMEM;
  47         if (k != 0)
  48                 return errno > 0 ? -errno : -EIO;
  49         if (strv_isempty(pglob->gl_pathv))
  50                 return -ENOENT;
  51
  52         return 0;
  53 }
  54
  55 int glob_exists(const char *path) {
  56         _cleanup_globfree_ glob_t g = {};
  57         int k;
  58
  59         assert(path);
  60
  61         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  62         if (k == -ENOENT)
  63                 return false;
  64         if (k < 0)
  65                 return k;
  66         return true;
  67 }
  68
  69 int glob_extend(char ***strv, const char *path) {
  70         _cleanup_globfree_ glob_t g = {};
  71         int k;
  72
  73         k = safe_glob(path, GLOB_NOSORT|GLOB_BRACE, &g);
  74         if (k < 0)
  75                 return k;
  76
  77         return strv_extend_strv(strv, g.gl_pathv, false);
  78 }