postgresql/contrib/pg_logger/pg_logger.c

/* pg_logger: stdin-to-syslog gateway for postgresql.
 *
 * Copyright 2001 by Nathan Myers <ncm@nospam.cantrip.org>
 * This software is distributed free of charge with no warranty of any kind.
 * You have permission to make copies for any purpose, provided that (1) 
 * this copyright notice is retained unchanged, and (2) you agree to 
 * absolve the author of all responsibility for all consequences arising 
 * from any use.  
 */

#include <stdio.h>
#include <stddef.h>
#include <syslog.h>
#include <string.h>

struct {
    const char *tag;
    int size;
    int priority;
} tags[] = {
    { "",         0,                 LOG_NOTICE },
    { "emerg:",   sizeof("emerg"),   LOG_EMERG },
    { "alert:",   sizeof("alert"),   LOG_ALERT },
    { "crit:",    sizeof("crit"),    LOG_CRIT },
    { "err:",     sizeof("err"),     LOG_ERR },
    { "error:",   sizeof("error"),   LOG_ERR },
    { "warning:", sizeof("warning"), LOG_WARNING },
    { "notice:",  sizeof("notice"),  LOG_NOTICE },
    { "info:",    sizeof("info"),    LOG_INFO },
    { "debug:",   sizeof("debug"),   LOG_DEBUG }
};

int main()
{
    char buf[301];
    int c;
    char *pos = buf;
    const char *colon = 0;

#ifndef DEBUG
    openlog("postgresql", LOG_CONS, LOG_LOCAL1);
#endif
    while ( (c = getchar()) != EOF) {
        if (c == '\r') {
          continue;
        }
        if (c == '\n') {
            int level = sizeof(tags)/sizeof(*tags);
            char *bol;

            if (colon == 0 || (size_t)(colon - buf) > sizeof("warning")) {
                level = 1;
            }
            *pos = 0;
            while (--level) {
                if (pos - buf >= tags[level].size
                    && strncmp(buf, tags[level].tag, tags[level].size) == 0) {
                    break; 
                }
            }
            bol = buf + tags[level].size;
            if (bol > buf && *bol == ' ') {
                ++bol;
            }
            if (pos - bol > 0) {
#ifndef DEBUG
                syslog(tags[level].priority, "%s", bol);
#else
                printf("%d/%s\n", tags[level].priority, bol);
#endif
            }
            pos = buf;
            colon = (char const *)0;
            continue;
        }
        if (c == ':' && !colon) {
            colon = pos;
        }
        if ((size_t)(pos - buf) < sizeof(buf)-1) {
            *pos++ = c;
        }
    }
    return 0;
}