vsyslog.c

sock protocol ,it is useful!

/* $Id: vsyslog.c,v 1.6 1999/08/30 17:28:14 karls Exp $ */

#ifdef HAVE_CONFIG_H
#include "autoconf.h"
#endif  /* HAVE_CONFIG_H */

#include "common.h"

/* attempt to be clever; construct string and call syslog */

#if !HAVE_VSYSLOG

/*
 * Copyright (c) 1983, 1988, 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: syslog.c,v 1.8 1998/03/19 00:30:03 millert Exp $";
#endif /* LIBC_SCCS and not lint */

void
vsyslog(pri, fmt, ap)
	int pri;
	register const char *fmt;
	va_list ap;
{
	register char ch, *t;

	int saved_errno;
#define	TBUF_LEN	2048
#define	FMT_LEN		1024
	char tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
	int fmt_left, prlen;

	saved_errno = errno;

	/* Build the message. */

	/*
	 * We wouldn't need this mess if printf handled %m, or if
	 * strerror() had been invented before syslog().
	 */
	for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt); ++fmt) {
		if (ch == '%' && fmt[1] == 'm') {
			++fmt;
			prlen = snprintf(t, fmt_left, "%s",
			    strerror(saved_errno));
			if (prlen >= fmt_left)
				prlen = fmt_left - 1;
			t += prlen;
			fmt_left -= prlen;
		} else {
			if (fmt_left > 1) {
				*t++ = ch;
				fmt_left--;
			}
		}
	}
	*t = '\0';

	prlen = vsnprintf(tbuf, TBUF_LEN, fmt_cpy, ap);

	syslog(pri, tbuf);

	return;
}
#else
static void avoid_error __P((void));
static void avoid_error()
{
	avoid_error();
}
#endif /* !HAVE_VSYSLOG */