/**
* 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 _ERROR_H
#define _ERROR_H
#include <slibc/version.h>
#include <slibc/features.h>
#ifndef _SLIBC_SUPPRESS_WARNINGS
# warning "Please consider not using <error.h>."
#endif
#define __NEED_va_list
#include <bits/types.h>
#if defined(__GNU_SOURCE)
/**
* Print an error message with a detailed description, and optionally exit.
*
* This is a GNU extension.
*
* @etymology Report (error)!
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void error(int, int, const char*, ...)
__GCC_ONLY(__attribute__((__format__(__slibc_printf__, 3, 4))));
/**
* Variant of `error` that uses `va_list` instead of variadic arguments.
*
* This is a slibc extension to the GNU extension `error`.
*
* @etymology (V)ariadic version of (`error`).
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
# if defined(__SLIBC_SOURCE)
void verror(int, int, const char*, va_list);
# endif
/**
* Variant of `error` that prints the filename and the line
* number whence the error occurred.
*
* This is a GNU extension.
*
* @etymology Report (error at line) in source code!
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param filename The filename of the source code file where the error occurred.
* @param linenum The line number of in the source code file where the error occurred.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void error_at_line(int, int, const char*, unsigned int, const char*, ...)
__GCC_ONLY(__attribute__((__format__(__slibc_printf__, 5, 6))));
/**
* Variant of `verror` that prints the filename and the line
* number whence the error occurred.
*
* This is a slibc extension to the GNU extension `error_at_line`.
*
* @etymology (V)ariadic version of (`error_at_line`).
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param filename The filename of the source code file where the error occurred.
* @param linenum The line number of in the source code file where the error occurred.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
# if defined(__SLIBC_SOURCE)
void verror_at_line(int, int, const char*, unsigned int, const char*, va_list);
# endif
/**
* Counts the number of times `error` (`verror`) and
* `error_at_line` (`verror_at_line`) has returned.
* This variable is global and shared by all threads.
*
* This is a GNU extension.
*
* @etymology (`error`)-subsystem: (message count).
*/
extern volatile unsigned int error_message_count;
/**
* If set to non-zero (the default), `error_at_line`
* and `verror_at_line` restrict themself to only
* print an error the first time it appears. This
* is determined by the uniqueness of the combination
* of the values on `filename` and `linenum`. However
* it will forget the line the next time the function
* is called from a different line. This variable is
* global and shared by all threads. As a slibc
* modification, `errnum` is also remembered, meaning
* if the error code is different (zero is considered
* an error code), the error is printed even if it
* occurred on the same line as the last time.
*
* This is a GNU extension.
*
* @etymology (`error`)-subsystem: print (one) time (per line).
*/
extern volatile int error_one_per_line;
/**
* If not `NULL`, this function is used instead of
* flushing stdout and printing the process name to
* stderr, by `error` (`verror`) and `verror_at_line`
* (`verror_at_line`). This variable is global and
* shared by all threads.
*
* This is a GNU extension.
*
* @etymology (`error`)-subsystem function: (print) the (prog)ram's (name).
*/
extern void (*volatile error_print_progname)(void);
#endif
#endif
