sysdeps/mach/xpg-strerror.c

   1 /* Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2010
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <libintl.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <mach/error.h>
  24 #include <errorlib.h>
  25 #include <sys/param.h>
  26 #include <_itoa.h>
  27
  28 /* It is critical here that we always use the `dcgettext' function for
  29    the message translation.  Since <libintl.h> only defines the macro
  30    `dgettext' to use `dcgettext' for optimizing programs this is not
  31    always guaranteed.  */
  32 #ifndef dgettext
  33 # include <locale.h>            /* We need LC_MESSAGES.  */
  34 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  35 #endif
  36
  37 /* Fill buf with a string describing the errno code in ERRNUM.  */
  38 int
  39 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
  40 {
  41   int system;
  42   int sub;
  43   int code;
  44   const struct error_system *es;
  45   extern void __mach_error_map_compat (int *);
  46   const char *estr;
  47
  48   __mach_error_map_compat (&errnum);
  49
  50   system = err_get_system (errnum);
  51   sub = err_get_sub (errnum);
  52   code = err_get_code (errnum);
  53
  54   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  55     return EINVAL;
  56
  57   es = &__mach_error_systems[system];
  58
  59   if (sub >= es->max_sub)
  60     estr = (const char *) es->bad_sub;
  61   else if (code >= es->subsystem[sub].max_code)
  62     return EINVAL;
  63   else
  64     estr = (const char *) _(es->subsystem[sub].codes[code]);
  65
  66   size_t estrlen = strlen (estr) + 1;
  67
  68   if (buflen < estrlen)
  69     return ERANGE;
  70
  71   memcpy (buf, estr, estrlen);
  72   return 0;
  73 }