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/**
* slibc — Yet another C library
* Copyright © 2015, 2016 Mattias Andrée (m@maandree.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <errno.h>
/**
* Reenterant variant of `strerror`.
*
* This is an XSI-compliant extension. However the name
* is not part of the XSI specification, `strerror_r`
* should be used. It is defined to this function if
* `(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE`.
* However it is not defined if _SLIBC_SOURCE is defined.
*
* @param errnum The error code.
* @param buf Buffer where the description shall be stored.
* @param buflen The allocation size of `buf`.
* @return Zero on success, value for `errno` on error
*
* @throws ERANGE `buf` was too small to store the description.
*
* @since Always.
*/
int __xsi_strerror_r(int errnum, char* buf, size_t buflen)
{
char* description = strerror(errnum);
size_t length = strlen(description);
if (buflen == 0)
return ERANGE;
if (buflen <= length)
{
memcpy(buf, description, buflen - 1);
buf[buflen - 1] = 0;
return ERANGE;
}
return memcpy(buf, description, length + 1), 0;
}
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