src/udev/udevadm-util.c

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright © 2008-2009 Kay Sievers <kay@vrfy.org>
   4  *
   5  */
   6
   7 #include "path-util.h"
   8 #include "string-util.h"
   9 #include "udevadm-util.h"
  10
  11 struct udev_device *find_device(struct udev *udev,
  12                                 const char *id,
  13                                 const char *prefix) {
  14
  15         assert(udev);
  16         assert(id);
  17
  18         if (prefix && !startswith(id, prefix))
  19                 id = strjoina(prefix, id);
  20
  21         if (path_startswith(id, "/dev/")) {
  22                 struct stat statbuf;
  23                 char type;
  24
  25                 if (stat(id, &statbuf) < 0)
  26                         return NULL;
  27
  28                 if (S_ISBLK(statbuf.st_mode))
  29                         type = 'b';
  30                 else if (S_ISCHR(statbuf.st_mode))
  31                         type = 'c';
  32                 else
  33                         return NULL;
  34
  35                 return udev_device_new_from_devnum(udev, type, statbuf.st_rdev);
  36         } else if (path_startswith(id, "/sys/"))
  37                 return udev_device_new_from_syspath(udev, id);
  38         else
  39                 return NULL;
  40 }