src/basic/errno-list.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 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 <string.h>
  21
  22 #include "errno-list.h"
  23 #include "macro.h"
  24
  25 static const struct errno_name* lookup_errno(register const char *str,
  26                                              register unsigned int len);
  27
  28 #include "errno-from-name.h"
  29 #include "errno-to-name.h"
  30
  31 const char *errno_to_name(int id) {
  32
  33         if (id < 0)
  34                 id = -id;
  35
  36         if (id >= (int) ELEMENTSOF(errno_names))
  37                 return NULL;
  38
  39         return errno_names[id];
  40 }
  41
  42 int errno_from_name(const char *name) {
  43         const struct errno_name *sc;
  44
  45         assert(name);
  46
  47         sc = lookup_errno(name, strlen(name));
  48         if (!sc)
  49                 return -EINVAL;
  50
  51         assert(sc->id > 0);
  52         return sc->id;
  53 }
  54
  55 int errno_max(void) {
  56         return ELEMENTSOF(errno_names);
  57 }