src/udev/udevadm-util.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2
   3 #include <errno.h>
   4
   5 #include "alloc-util.h"
   6 #include "device-private.h"
   7 #include "path-util.h"
   8 #include "udevadm-util.h"
   9
  10 int find_device(const char *id, const char *prefix, sd_device **ret) {
  11         _cleanup_free_ char *buf = NULL;
  12
  13         assert(id);
  14         assert(ret);
  15
  16         if (prefix && !path_startswith(id, prefix)) {
  17                 buf = path_join(NULL, prefix, id);
  18                 if (!buf)
  19                         return -ENOMEM;
  20                 id = buf;
  21         }
  22
  23         if (path_startswith(id, "/sys/"))
  24                 return sd_device_new_from_syspath(ret, id);
  25
  26         if (path_startswith(id, "/dev/")) {
  27                 struct stat st;
  28
  29                 if (stat(id, &st) < 0)
  30                         return -errno;
  31
  32                 return device_new_from_stat_rdev(ret, &st);
  33         }
  34
  35         return -EINVAL;
  36 }