/*      $NetBSD: logger.c,v 1.6 2025/03/07 15:55:29 christos Exp $      */

/*      $KAME: logger.c,v 1.9 2002/09/03 14:37:03 itojun Exp $  */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/param.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_STDARG_H
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#include "logger.h"
#include "var.h"
#include "gcmalloc.h"

struct log *
log_open(size_t siz, char *fname)
{
        struct log *p;

        p = (struct log *)racoon_malloc(sizeof(*p));
        if (p == NULL)
                return NULL;
        memset(p, 0, sizeof(*p));

        p->buf = (char **)racoon_malloc(sizeof(char *) * siz);
        if (p->buf == NULL) {
                racoon_free(p);
                return NULL;
        }
        memset(p->buf, 0, sizeof(char *) * siz);

        p->tbuf = (time_t *)racoon_malloc(sizeof(time_t) * siz);
        if (p->tbuf == NULL) {
                racoon_free(p->buf);
                racoon_free(p);
                return NULL;
        }
        memset(p->tbuf, 0, sizeof(time_t) * siz);

        p->siz = siz;
        if (fname)
                p->fname = racoon_strdup(fname);

        return p;
}

/*
 * append string to ring buffer.
 * string must be \n-terminated (since we add timestamps).
 * even if not, we'll add \n to avoid formatting mistake (see log_close()).
 */
void
log_add(struct log *p, char *str)
{
        /* syslog if p->fname == NULL? */
        if (p->buf[p->head])
                racoon_free(p->buf[p->head]);
        p->buf[p->head] = racoon_strdup(str);
        p->tbuf[p->head] = time(NULL);
        p->head++;
        p->head %= p->siz;
}

/*
 * write out string to the log file, as is.
 * \n-termination is up to the caller.  if you don't add \n, the file
 * format may be broken.
 */
int
log_print(struct log *p, char *str)
{
        FILE *fp;

        if (p->fname == NULL)
                return -1;      /*XXX syslog?*/
        fp = fopen(p->fname, "a");
        if (fp == NULL)
                return -1;
        fprintf(fp, "%s", str);
        fclose(fp);

        return 0;
}

int
log_vprint(struct log *p, const char *fmt, ...)
{
        va_list ap;

        FILE *fp;

        if (p->fname == NULL)
                return -1;      /*XXX syslog?*/
        fp = fopen(p->fname, "a");
        if (fp == NULL)
                return -1;
        va_start(ap, fmt);
        vfprintf(fp, fmt, ap);
        va_end(ap);

        fclose(fp);

        return 0;
}

int
log_vaprint(struct log *p, const char *fmt, va_list ap)
{
        FILE *fp;

        if (p->fname == NULL)
                return -1;      /*XXX syslog?*/
        fp = fopen(p->fname, "a");
        if (fp == NULL)
                return -1;
        vfprintf(fp, fmt, ap);
        fclose(fp);

        return 0;
}

/*
 * write out content of ring buffer, and reclaim the log structure
 */
int
log_close(struct log *p)
{
        FILE *fp;
        int i, j;
        char ts[256];
        struct tm *tm;

        if (p->fname == NULL)
                goto nowrite;
        fp = fopen(p->fname, "a");
        if (fp == NULL)
                goto nowrite;

        for (i = 0; i < p->siz; i++) {
                j = (p->head + i) % p->siz;
                if (p->buf[j]) {
                        tm = localtime(&p->tbuf[j]);
                        strftime(ts, sizeof(ts), "%B %d %T", tm);
                        fprintf(fp, "%s: %s\n", ts, p->buf[j]);
                        if (*(p->buf[j] + strlen(p->buf[j]) - 1) != '\n')
                                fprintf(fp, "\n");
                }
        }
        fclose(fp);

nowrite:
        log_free(p);
        return 0;
}

void
log_free(struct log *p)
{
        int i;

        for (i = 0; i < p->siz; i++)
                racoon_free(p->buf[i]);
        racoon_free(p->buf);
        racoon_free(p->tbuf);
        if (p->fname)
                racoon_free(p->fname);
        racoon_free(p);
}

#ifdef TEST
struct log *l;

void
vatest(const char *fmt, ...)
{
        va_list ap;
        va_start(ap, fmt);
        log_vaprint(l, fmt, ap);
        va_end(ap);
}

int
main(argc, argv)
        int argc;
        char **argv;
{
        int i;

        l = log_open(30, "/tmp/hoge");
        if (l == NULL)
                errx(1, "hoge");

        for (i = 0; i < 50; i++) {
                log_add(l, "foo");
                log_add(l, "baa");
                log_add(l, "baz");
        }
        log_print(l, "hoge\n");
        log_vprint(l, "hoge %s\n", "this is test");
        vatest("%s %s\n", "this is", "vprint test");
        abort();
        log_free(l);
}

#endif