sysdeps/posix/gai_strerror.c

   1 /* Copyright (C) 1997, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Philip Blundell <pjb27@cam.ac.uk>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <libintl.h>
  21 #include <netdb.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24
  25
  26 #define MSGSTRFIELD(line) MSGSTRFIELD1 (line)
  27 #define MSGSTRFIELD1(line) str##line
  28 static const union msgstr_t
  29 {
  30   struct
  31   {
  32 #define _S(n, s) char MSGSTRFIELD(__LINE__)[sizeof (s)];
  33 #include "gai_strerror-strs.h"
  34 #undef _S
  35   };
  36   char str[0];
  37 } msgstr =
  38   {
  39     {
  40 #define _S(n, s) s,
  41 #include "gai_strerror-strs.h"
  42 #undef _S
  43     }
  44   };
  45 static const struct
  46 {
  47   int16_t code;
  48   uint16_t idx;
  49 } msgidx[] =
  50   {
  51 #define _S(n, s) { n, offsetof (union msgstr_t, MSGSTRFIELD (__LINE__)) },
  52 #include "gai_strerror-strs.h"
  53 #undef _S
  54   };
  55
  56
  57 const char *
  58 gai_strerror (int code)
  59 {
  60   const char *result = "Unknown error";
  61   for (size_t i = 0; i < sizeof (msgidx) / sizeof (msgidx[0]); ++i)
  62     if (msgidx[i].code == code)
  63       {
  64         result = msgstr.str + msgidx[i].idx;
  65         break;
  66       }
  67
  68   return _(result);
  69 }
  70 libc_hidden_def (gai_strerror)