/*	$OpenBSD: log.c,v 1.35 2006/05/27 03:30:30 joris Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

#include "includes.h"

#include "cvs.h"
#include "log.h"

extern char *__progname;

static int send_m = 1;

/*
 * cvs_log()
 *
 * Log the format-string message
 * The <fmt> argument should not have a terminating newline, as this is taken
 * care of by the logging facility.
 */
void
cvs_log(u_int level, const char *fmt, ...)
{
	va_list vap;

	va_start(vap, fmt);
	cvs_vlog(level, fmt, vap);
	va_end(vap);
}

/*
 * cvs_vlog()
 *
 * The <fmt> argument should not have a terminating newline, as this is taken
 * care of by the logging facility.
 */
void
cvs_vlog(u_int level, const char *fmt, va_list vap)
{
	int ecp;
	char prefix[64], buf[1024], ebuf[255];
	FILE *out;
	char *cmdname;
	struct cvs_cmd *cmdp;

	if (cvs_trace != 1 && level == LP_TRACE)
		return;

	if (level == LP_ERRNO)
		ecp = errno;
	else
		ecp = 0;

	/* always use the command name in error messages, not aliases */
	if (cvs_command == NULL)
		cmdname = " ";
	else {
		cmdp = cvs_findcmd(cvs_command);
		cmdname = cmdp->cmd_name;
	}

	/* The cvs program appends the command name to the program name */
	if (level == LP_TRACE) {
		strlcpy(prefix, " -> ", sizeof(prefix));
		if (cvs_cmdop == CVS_OP_SERVER)
			prefix[0] = 'S';
	} else if (cvs_command != NULL) {
		if (level == LP_ABORT)
			snprintf(prefix, sizeof(prefix), "%s [%s aborted]",
			    __progname, cmdname);
		else
			snprintf(prefix, sizeof(prefix), "%s %s", __progname,
			    cmdname);
	} else /* just use the standard strlcpy */
		strlcpy(prefix, __progname, sizeof(prefix));

	vsnprintf(buf, sizeof(buf), fmt, vap);
	if (level == LP_ERRNO) {
		snprintf(ebuf, sizeof(ebuf), ": %s", strerror(errno));
		strlcat(buf, ebuf, sizeof(buf));
	}

	if (level == LP_NOTICE)
		out = stdout;
	else
		out = stderr;

	if (cvs_cmdop == CVS_OP_SERVER) {
		if (out == stdout)
			putc('M', out);
		else {
			out = stdout;
			putc('E', out);
		}

		putc(' ', out);
	}

	fputs(prefix, out);
	if (level != LP_TRACE)
		fputs(": ", out);
	fputs(buf, out);
	fputc('\n', out);

	/* preserve it just in case we changed it? */
	if (level == LP_ERRNO)
		errno = ecp;
}

/*
 * cvs_printf()
 *
 * Wrapper function around printf() that prepends a 'M' command when
 * the program is acting as server.
 */
int
cvs_printf(const char *fmt, ...)
{
	int ret;
	char *nstr, *dp, *sp;
	va_list vap;

	va_start(vap, fmt);

	if (cvs_cmdop == CVS_OP_SERVER) {
		ret = vasprintf(&nstr, fmt, vap);
		if (ret == -1)
			fatal("cvs_printf: %s", strerror(errno));
		for (dp = nstr; *dp != '\0';) {
			sp = strchr(dp, '\n');
			if (sp == NULL)
				for (sp = dp; *sp != '\0'; sp++)
					;

			if (send_m) {
				send_m = 0;
				putc('M', stdout);
				putc(' ', stdout);
			}

			fwrite(dp, sizeof(char), (size_t)(sp - dp), stdout);

			if (*sp != '\n')
				break;

			putc('\n', stdout);
			send_m = 1;
			dp = sp + 1;
		}
		xfree(nstr);
	} else
		ret = vprintf(fmt, vap);

	va_end(vap);
	return (ret);
}