errwarn.c

/*
 * Copyright (c) 2006-2015, Loic Tortay <tortay@cc.in2p3.fr>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * *BSD inspired error & warning reporting micro-framework.
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "errwarn.h"

extern const char progname[];

static void verror(const int, const char*, va_list);


void
verror(const int errnum, const char *fmt, va_list ap)
{
	char *errmsg = NULL;

	if (errnum != -1)
		errmsg = strerror(errnum);

	fprintf(stderr, "%s: ", progname);
	if (fmt != NULL)
		vfprintf(stderr, fmt, ap);

	if (errnum != -1)
		fprintf(stderr, ": %.100s (%d)\n", errmsg, errnum);
	else
		fputc('\n', stderr);
}


void
error(const int excode, const int errnum, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	verror(errnum, fmt, ap);
	va_end(ap);

	exit(excode);
}


void
warning(const int errnum, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	verror(errnum, fmt, ap);
	va_end(ap);
}