/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

static const char sccsid[] = "@(#)err.c	8.1 (Berkeley) 6/4/93";
static const char cvsid[] =
"$FreeBSD: src/lib/libc/gen/err.c,v 1.13 2002/03/29 22:43:41 markm Exp $";
static const char camid[] =
"$Cambridge: hermes/src/2hermes/err.c,v 1.2 2003/11/05 16:10:23 fanf2 Exp $";

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

#include "err.h"

static int              err_debug;      /* debugging level */
static void           (*err_exit)(int); /* hook to use before exit() */
static FILE            *err_file;       /* file to use for error output */
static const char      *err_progname;   /* name of this program */

void
err_set_debug(int level)
{
	err_debug = level;
}

void
err_set_exit(void (*ef)(int))
{
	err_exit = ef;
}

void
err_set_file(FILE *fp)
{
	if(fp != NULL)
		err_file = fp;
	else
		err_file = stderr;
}

const char *
getprogname(void)
{
	return(err_progname);
}

void
setprogname(const char *argv0)
{
	err_progname = strrchr(argv0, '/');
	if(err_progname == NULL)
		err_progname = argv0;
	else
		err_progname += 1;
}

void
debug(int level, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vdebug(level, fmt, ap);
	va_end(ap);
}

void
vdebug(int level, const char *fmt, va_list ap)
{
	if(level > err_debug)
		return;
	if(err_file == 0)
		err_set_file(NULL);
	fprintf(err_file, "%s: debug %d: ", err_progname, level);
	if(fmt != NULL)
		vfprintf(err_file, fmt, ap);
	fprintf(err_file, "\n");
}

void
err(int eval, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	verrc(eval, errno, fmt, ap);
	va_end(ap);
}

void
verr(int eval, const char *fmt, va_list ap)
{
	verrc(eval, errno, fmt, ap);
}

void
errc(int eval, int code, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	verrc(eval, code, fmt, ap);
	va_end(ap);
}

void
verrc(int eval, int code, const char *fmt, va_list ap)
{
	if(err_file == 0)
		err_set_file(NULL);
	fprintf(err_file, "%s: ", err_progname);
	if(fmt != NULL) {
		vfprintf(err_file, fmt, ap);
		fprintf(err_file, ": ");
	}
	fprintf(err_file, "%s\n", strerror(code));
	if(err_exit != NULL)
		err_exit(eval);
	exit(eval);
}

void
errx(int eval, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	verrx(eval, fmt, ap);
	va_end(ap);
}

void
verrx(int eval, const char *fmt, va_list ap)
{
	if(err_file == 0)
		err_set_file(NULL);
	fprintf(err_file, "%s: ", err_progname);
	if(fmt != NULL)
		vfprintf(err_file, fmt, ap);
	fprintf(err_file, "\n");
	if(err_exit != NULL)
		err_exit(eval);
	exit(eval);
}

void
warn(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vwarnc(errno, fmt, ap);
	va_end(ap);
}

void
vwarn(const char *fmt, va_list ap)
{
	vwarnc(errno, fmt, ap);
}

void
warnc(int code, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vwarnc(code, fmt, ap);
	va_end(ap);
}

void
vwarnc(int code, const char *fmt, va_list ap)
{
	if(err_file == 0)
		err_set_file(NULL);
	fprintf(err_file, "%s: ", err_progname);
	if(fmt != NULL) {
		vfprintf(err_file, fmt, ap);
		fprintf(err_file, ": ");
	}
	fprintf(err_file, "%s\n", strerror(code));
}

void
warnx(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vwarnx(fmt, ap);
	va_end(ap);
}

void
vwarnx(const char *fmt, va_list ap)
{
	if(err_file == 0)
		err_set_file(NULL);
	fprintf(err_file, "%s: ", err_progname);
	if(fmt != NULL)
		vfprintf(err_file, fmt, ap);
	fprintf(err_file, "\n");
}