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glibc  2.9
xpg-strerror.c
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00001 /* Copyright (C) 1991, 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 <sys/param.h>
00025 #include <stdio-common/_itoa.h>
00026 
00027 /* It is critical here that we always use the `dcgettext' function for
00028    the message translation.  Since <libintl.h> only defines the macro
00029    `dgettext' to use `dcgettext' for optimizing programs this is not
00030    always guaranteed.  */
00031 #ifndef dgettext
00032 # include <locale.h>        /* We need LC_MESSAGES.  */
00033 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
00034 #endif
00035 
00036 /* Fill buf with a string describing the errno code in ERRNUM.  */
00037 int
00038 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
00039 {
00040   if (errnum < 0 || errnum >= _sys_nerr_internal
00041       || _sys_errlist_internal[errnum] == NULL)
00042     {
00043       __set_errno (EINVAL);
00044       return -1;
00045     }
00046   const char *estr = (const char *) _(_sys_errlist_internal[errnum]);
00047   size_t estrlen = strlen (estr) + 1;
00048 
00049   if (buflen < estrlen)
00050     {
00051       __set_errno (ERANGE);
00052       return -1;
00053     }
00054 
00055   memcpy (buf, estr, estrlen);
00056   return 0;
00057 }