logger.c

早期freebsd实现

/*  $Revision: 1.4 $
**  Modified by Rich $alz <[e-mail]> to be more portable to older
**  systems.
*/
/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)logger.c	6.14 (Berkeley) 6/1/90";
#endif /* not lint */

#include <stdio.h>
#define SYSLOG_NAMES
#include "syslog.h"
#include <ctype.h>

/*
**  LOGGER -- read and log utility
**
**	This routine reads from an input and arranges to write the
**	result on the system log, along with a useful tag.
*/

/*
**  Return a string representation of errno.
*/
static char *
xstrerror(e)
    int		e;
{
    extern int	sys_nerr;
    extern char	*sys_errlist[];
    static char	buff[30];

    if (e >= 0 && e < sys_nerr)
	return sys_errlist[e];
    (void)sprintf(buff, "Error code %d\n", e);
    return buff;
}

main(argc, argv)
	int argc;
	char **argv;
{
	extern char *optarg;
	extern int errno, optind;
	int pri = LOG_NOTICE;
	int ch, logflags = 0;
	char *tag, buf[1024], *getlogin();

	tag = NULL;
	while ((ch = getopt(argc, argv, "f:ip:st:")) != EOF)
		switch((char)ch) {
		case 'f':		/* file to log */
			if (freopen(optarg, "r", stdin) == NULL) {
				(void)fprintf(stderr, "logger: %s: %s.\n",
				    optarg, xstrerror(errno));
				exit(1);
			}
			break;
		case 'i':		/* log process id also */
			logflags |= LOG_PID;
			break;
		case 'p':		/* priority */
			pri = pencode(optarg);
			break;
		case 's':		/* log to standard error */
			logflags |= LOG_PERROR;
			break;
		case 't':		/* tag */
			tag = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	/* setup for logging */
	openlog(tag ? tag : getlogin(), logflags, 0);
	(void) fclose(stdout);

	/* log input line if appropriate */
	if (argc > 0) {
		register char *p, *endp;
		int len;

		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
			len = strlen(*argv);
			if (p + len > endp && p > buf) {
				syslog(pri, "%s", buf);
				p = buf;
			}
			if (len > sizeof(buf) - 1)
				syslog(pri, "%s", *argv++);
			else {
				if (p != buf)
					*p++ = ' ';
				bcopy(*argv++, p, len);
				*(p += len) = '\0';
			}
		}
		if (p != buf)
			syslog(pri, "%s", buf);
		exit(0);
	}

	/* main loop */
	while (fgets(buf, sizeof(buf), stdin) != NULL)
		syslog(pri, "%s", buf);

	exit(0);
}


/*
 *  Decode a symbolic name to a numeric value
 */
pencode(s)
	register char *s;
{
	char *save;
	int fac, lev;

	for (save = s; *s && *s != '.'; ++s);
	if (*s) {
		*s = '\0';
		fac = decode(save, facilitynames);
		if (fac < 0)
			bailout("unknown facility name: ", save);
		*s++ = '.';
	}
	else {
		fac = 0;
		s = save;
	}
	lev = decode(s, prioritynames);
	if (lev < 0)
		bailout("unknown priority name: ", save);
	return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK));
}


decode(name, codetab)
	char *name;
	CODE *codetab;
{
	register CODE *c;

	if (isdigit(*name))
		return (atoi(name));

	for (c = codetab; c->c_name; c++)
		if (!strcasecmp(name, c->c_name))
			return (c->c_val);

	return (-1);
}

bailout(msg, arg)
	char *msg, *arg;
{
	fprintf(stderr, "logger: %s%s\n", msg, arg);
	exit(1);
}

usage()
{
	fputs("logger: [-i] [-f file] [-p pri] [-t tag] [ message ... ]\n",
	    stderr);
	exit(1);
}