/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* 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/>.
*/
#ifndef _STRING_H
#define _STRING_H
#include <slibc/version.h>
#define __NEED_size_t
#define __NEED_locale_t /* TODO not defined */
#include <bits/types.h>
/**
* Return a textual representation of an error code.
* This error code must from `errno`.
*
* This implementation of `strerror` cannot fail. however
* POSIX specifies that it can fail, any may only set `errno`
* if it does fail. You should therefore, set `errno` to
* zero before calling this function, and inspect `errno`
* when it returns, as there is no reserved return value
* that indicates and error.
*
* The returned value must not be modified or freed.
*
* As a slibc-specific modification, this function is MT-Safe.
*
* @param errnum The error code.
* @return A description of the error.
*/
char* strerror(int)
__GCC_ONLY(__attribute__((returns_nonnull)));
/**
* Return a textual representation of an error code.
* This error code must from `errno`.
*
* POSIX specifies `errno` may only be set on failure,
* and reserves no return value to indicate such.
* You should therefore, set `errno` to zero before calling
* this function, and inspect `errno` when it returns.
*
* The returned value must not be modified or freed.
*
* As a slibc-specific modification, this function is MT-Safe.
*
* @param errnum The error code.
* @param locale The locale, must be a valid locale and not
* `LC_GLOBAL_LOCALE`, lest the behaviour is undefined.
* @return A description of the error.
*/
char* strerror_l(int, locale_t);
#ifndef _PORTABLE_SOURCE
/**
* Reenterant variant of `stderror`.
*
* 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`.
*
* @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.
*/
int __xsi_strerror_r(int, char*, size_t); /* XSI-compliant strerror_r */
/**
* Reenterant variant of `stderror`.
*
* This is a GNU-specific extension. However the name
* is not part of the GNU specification, `strerror_r` should
* be used. It is defined to this function unless
* `(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE`.
*
* @param errnum The error code.
* @param buf Buffer where the description shall be stored.
* @param buflen The allocation size of `buf`.
* @return `buf` on success, `NULL` on error. On error, `errno`
* is set to indicate the error.
*
* @throws ERANGE `buf` was too small to store the description.
*/
char* __gnu_strerror_r(int, char*, size_t); /* GNU-specific strerror_r */
# if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
# define strerror_r __xsi_strerror_r
# else
# define strerror_r __gnu_strerror_r
# endif
#endif
#endif
