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glibc/string/_strerror.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <libintl.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <sys/param.h> | |
#include <_itoa.h> | |
/* It is critical here that we always use the `dcgettext' function for | |
the message translation. Since <libintl.h> only defines the macro | |
`dgettext' to use `dcgettext' for optimizing programs this is not | |
always guaranteed. */ | |
#ifndef dgettext | |
# include <locale.h> /* We need LC_MESSAGES. */ | |
# define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES) | |
#endif | |
/* Return a string describing the errno code in ERRNUM. */ | |
char * | |
__strerror_r (int errnum, char *buf, size_t buflen) | |
{ | |
if (__builtin_expect (errnum < 0 || errnum >= _sys_nerr_internal | |
|| _sys_errlist_internal[errnum] == NULL, 0)) | |
{ | |
/* Buffer we use to print the number in. For a maximum size for | |
`int' of 8 bytes we never need more than 20 digits. */ | |
char numbuf[21]; | |
const char *unk = _("Unknown error "); | |
size_t unklen = strlen (unk); | |
char *p, *q; | |
bool negative = errnum < 0; | |
numbuf[20] = '\0'; | |
p = _itoa_word (abs (errnum), &numbuf[20], 10, 0); | |
/* Now construct the result while taking care for the destination | |
buffer size. */ | |
q = __mempcpy (buf, unk, MIN (unklen, buflen)); | |
if (negative && unklen < buflen) | |
{ | |
*q++ = '-'; | |
++unklen; | |
} | |
if (unklen < buflen) | |
memcpy (q, p, MIN ((size_t) (&numbuf[21] - p), buflen - unklen)); | |
/* Terminate the string in any case. */ | |
if (buflen > 0) | |
buf[buflen - 1] = '\0'; | |
return buf; | |
} | |
return (char *) _(_sys_errlist_internal[errnum]); | |
} | |
weak_alias (__strerror_r, strerror_r) | |
libc_hidden_def (__strerror_r) |