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/* This file is part of libbrandt.
* Copyright (C) 2016 GNUnet e.V.
*
* libbrandt 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.
*
* libbrandt 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
* libbrandt. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file util.c
* @brief Implementation of common utility functions.
* @author Markus Teich
*/
#include "brandt_config.h"
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
static FILE *logstream = NULL;
/**
* setlog sets another output for logging.
*
* @param[in] stream The new logging target.
*/
void
setlog (FILE *stream)
{
logstream = stream;
}
/**
* xvprintf prints a formatstring with prefix "libbrandt: ". If the format
* string ends with a ':', the strerror() from errno.h output will be appended.
* The output is always terminated with a newline.
*
* @param[in] fmt The format string
* @param[in] ap The inputs to the format string
*/
static void
xvprintf (const char *fmt, va_list ap)
{
fputs ("libbrandt: ", logstream ? logstream : stderr);
vfprintf (logstream ? logstream : stderr, fmt, ap);
if (fmt[0] && fmt[strlen (fmt) - 1] == ':')
{
fputc (' ', logstream ? logstream : stderr);
fputs (strerror (errno), logstream ? logstream : stderr);
}
else
{
fputc ('\n', logstream ? logstream : stderr);
}
}
/**
* eprintf prints an error message and then calls abort() to terminate the
* process.
*
* @param[in] fmt The format string
* @param[in] ... The inputs to the format string
*/
void
eprintf (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
xvprintf (fmt, ap);
va_end (ap);
abort ();
}
/**
* weprintf prints a warning message
*
* @param[in] fmt The format string
* @param[in] ... The inputs to the format string
*/
void
weprintf (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
xvprintf (fmt, ap);
va_end (ap);
}
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