stdio-common/errlist.c

   1 /* Copyright (C) 1991-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <errno.h>
  20 #include <libintl.h>
  21 #include <array_length.h>
  22
  23 #ifndef ERR_MAP
  24 # define ERR_MAP(n) n
  25 #endif
  26
  27 const char *const _sys_errlist_internal[] =
  28   {
  29 #define _S(n, str)         [ERR_MAP(n)] = str,
  30 #include <errlist.h>
  31 #undef _S
  32   };
  33
  34 const char *
  35 __get_errlist (int errnum)
  36 {
  37   if (errnum >= 0 && errnum < array_length (_sys_errlist_internal))
  38     return _sys_errlist_internal[errnum];
  39   return NULL;
  40 }
  41
  42 static const union sys_errname_t
  43 {
  44   struct
  45   {
  46 #define MSGSTRFIELD1(line) str##line
  47 #define MSGSTRFIELD(line)  MSGSTRFIELD1(line)
  48 #define _S(n, str)         char MSGSTRFIELD(__LINE__)[sizeof(#n)];
  49 #include <errlist.h>
  50 #undef _S
  51   };
  52   char str[0];
  53 } _sys_errname = { {
  54 #define _S(n, s) #n,
  55 #include <errlist.h>
  56 #undef _S
  57 } };
  58
  59 static const unsigned short _sys_errnameidx[] =
  60 {
  61 #define _S(n, s) \
  62   [ERR_MAP(n)] = offsetof(union sys_errname_t, MSGSTRFIELD(__LINE__)),
  63 #include <errlist.h>
  64 #undef _S
  65 };
  66
  67 const char *
  68 __get_errname (int errnum)
  69 {
  70   if (errnum < 0 || errnum >= array_length (_sys_errnameidx)
  71       || (errnum > 0 && _sys_errnameidx[errnum] == 0))
  72     return NULL;
  73   return _sys_errname.str + _sys_errnameidx[errnum];
  74 }
  75
  76 #include <errlist-compat.c>