Complete Linux/Complete Linux.iso/docs/system/daemons/syslog_f.z/syslog_f/logger/logger.c

C/C++ Source or Header | 1992-10-22 | 4.6 KB | 187 lines

/*
 * Copyright (c) 1983 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.
 */

#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    6.15 (Berkeley) 3/1/91";
#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.
*/

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(), *strerror();

    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, strerror(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) {
            (void)fprintf(stderr,
                "logger: unknown facility name: %s.\n", save);
            exit(1);
        }
        *s++ = '.';
    }
    else {
        fac = 0;
        s = save;
    }
    lev = decode(s, prioritynames);
    if (lev < 0) {
        (void)fprintf(stderr,
            "logger: unknown priority name: %s.\n", save);
        exit(1);
    }
    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);
}

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