src/shared/errno-list.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 #include "util.h"
  26 #include "errno-list.h"
  27
  28 static const struct errno_name* lookup_errno(register const char *str,
  29                                                  register unsigned int len);
  30
  31 #include "errno-to-name.h"
  32 #include "errno-from-name.h"
  33
  34 const char *errno_to_name(int id) {
  35
  36         if (id < 0)
  37                 id = -id;
  38
  39         if (id >= (int) ELEMENTSOF(errno_names))
  40                 return NULL;
  41
  42         return errno_names[id];
  43 }
  44
  45 int errno_from_name(const char *name) {
  46         const struct errno_name *sc;
  47
  48         assert(name);
  49
  50         sc = lookup_errno(name, strlen(name));
  51         if (!sc)
  52                 return 0;
  53
  54         return sc->id;
  55 }
  56
  57 int errno_max(void) {
  58         return ELEMENTSOF(errno_names);
  59 }