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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <libintl.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <mach/error.h>
  25 #include <errorlib.h>
  26 #include <sys/param.h>
  27 #include <stdio-common/_itoa.h>
  28
  29 /* It is critical here that we always use the `dcgettext' function for
  30    the message translation.  Since <libintl.h> only defines the macro
  31    `dgettext' to use `dcgettext' for optimizing programs this is not
  32    always guaranteed.  */
  33 #ifndef dgettext
  34 # include <locale.h>            /* We need LC_MESSAGES.  */
  35 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  36 #endif
  37
  38 /* Fill buf with a string describing the errno code in ERRNUM.  */
  39 int
  40 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
  41 {
  42   int system;
  43   int sub;
  44   int code;
  45   const struct error_system *es;
  46   extern void __mach_error_map_compat (int *);
  47   const char *estr;
  48
  49   __mach_error_map_compat (&errnum);
  50
  51   system = err_get_system (errnum);
  52   sub = err_get_sub (errnum);
  53   code = err_get_code (errnum);
  54
  55   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  56     return EINVAL;
  57
  58   es = &__mach_error_systems[system];
  59
  60   if (sub >= es->max_sub)
  61     estr = (const char *) es->bad_sub;
  62   else if (code >= es->subsystem[sub].max_code)
  63     return EINVAL;
  64   else
  65     estr = (const char *) _(es->subsystem[sub].codes[code]);
  66
  67   size_t estrlen = strlen (estr) + 1;
  68
  69   if (buflen < estrlen)
  70     return ERANGE;
  71
  72   memcpy (buf, estr, estrlen);
  73   return 0;
  74 }