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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/param.h>
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/* Fill buf with a string describing the errno code in ERRNUM. */
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int
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__xpg_strerror_r (int errnum, char *buf, size_t buflen)
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{
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const char *estr = __strerror_r (errnum, buf, buflen);
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/* We know that __strerror_r returns buf (with a dynamically computed
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string) if errnum is invalid, otherwise it returns a string whose
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storage has indefinite extent. */
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if (estr == buf)
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{
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assert (errnum < 0 || errnum >= _sys_nerr_internal
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|| _sys_errlist_internal[errnum] == NULL);
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return EINVAL;
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}
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else
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{
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assert (errnum >= 0 && errnum < _sys_nerr_internal
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&& _sys_errlist_internal[errnum] != NULL);
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size_t estrlen = strlen (estr);
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/* Terminate the string in any case. */
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if (buflen > 0)
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*((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0';
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return buflen <= estrlen ? ERANGE : 0;
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}
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}
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