sysdeps/mach/xpg-strerror.c

   1 /* Copyright (C) 1993-2023 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 <errno.h>
  19 #include <libintl.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <mach/error.h>
  23 #include <errorlib.h>
  24 #include <sys/param.h>
  25 #include <_itoa.h>
  26
  27 /* It is critical here that we always use the `dcgettext' function for
  28    the message translation.  Since <libintl.h> only defines the macro
  29    `dgettext' to use `dcgettext' for optimizing programs this is not
  30    always guaranteed.  */
  31 #ifndef dgettext
  32 # include <locale.h>            /* We need LC_MESSAGES.  */
  33 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  34 #endif
  35
  36 /* Fill buf with a string describing the errno code in ERRNUM.  */
  37 int
  38 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
  39 {
  40   int system;
  41   int sub;
  42   int code;
  43   const struct error_system *es;
  44   extern void __mach_error_map_compat (int *);
  45   const char *estr;
  46
  47   __mach_error_map_compat (&errnum);
  48
  49   system = err_get_system (errnum);
  50   sub = err_get_sub (errnum);
  51   code = err_get_code (errnum);
  52
  53   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
  54     {
  55       __snprintf (buf, buflen, "%s%X", _("Error in unknown error system: "),
  56                   errnum);
  57       return EINVAL;
  58     }
  59
  60   es = &__mach_error_systems[system];
  61
  62   if (sub >= es->max_sub)
  63     estr = (const char *) es->bad_sub;
  64   else if (code >= es->subsystem[sub].max_code)
  65     return EINVAL;
  66   else
  67     estr = (const char *) _(es->subsystem[sub].codes[code]);
  68
  69   size_t estrlen = strlen (estr);
  70
  71   /* Terminate the string in any case.  */
  72   if (buflen > 0)
  73     *((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0';
  74
  75   return buflen <= estrlen ? ERANGE : 0;
  76 }