Back to index

glibc  2.9
xpg-strerror.c
Go to the documentation of this file.
00001 /* Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000, 2002, 2004
00002    Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <libintl.h>
00022 #include <stdio.h>
00023 #include <string.h>
00024 #include <mach/error.h>
00025 #include <errorlib.h>
00026 #include <sys/param.h>
00027 #include <stdio-common/_itoa.h>
00028 
00029 /* It is critical here that we always use the `dcgettext' function for
00030    the message translation.  Since <libintl.h> only defines the macro
00031    `dgettext' to use `dcgettext' for optimizing programs this is not
00032    always guaranteed.  */
00033 #ifndef dgettext
00034 # include <locale.h>        /* We need LC_MESSAGES.  */
00035 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
00036 #endif
00037 
00038 /* Fill buf with a string describing the errno code in ERRNUM.  */
00039 int
00040 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
00041 {
00042   int system;
00043   int sub;
00044   int code;
00045   const struct error_system *es;
00046   extern void __mach_error_map_compat (int *);
00047   const char *estr;
00048 
00049   __mach_error_map_compat (&errnum);
00050 
00051   system = err_get_system (errnum);
00052   sub = err_get_sub (errnum);
00053   code = err_get_code (errnum);
00054 
00055   if (system > err_max_system || ! __mach_error_systems[system].bad_sub)
00056     {
00057       __set_errno (EINVAL);
00058       return -1;
00059     }
00060 
00061   es = &__mach_error_systems[system];
00062 
00063   if (sub >= es->max_sub)
00064     estr = (const char *) es->bad_sub;
00065   else if (code >= es->subsystem[sub].max_code)
00066     {
00067       __set_errno (EINVAL);
00068       return -1;
00069     }
00070   else
00071     estr = (const char *) _(es->subsystem[sub].codes[code]);
00072 
00073   size_t estrlen = strlen (estr) + 1;
00074 
00075   if (buflen < estrlen)
00076     {
00077       __set_errno (ERANGE);
00078       return -1;
00079     }
00080 
00081   memcpy (buf, estr, estrlen);
00082   return 0;
00083 }