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/* The stdlog file driver.
*
* Copyright (C) 2014 Adiscon GmbH
* 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.
*
* THIS SOFTWARE IS PROVIDED BY ADISCON 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 ADISCON 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdint.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include "stdlog-intern.h"
#include "stdlog.h"
static int
build_file_line(stdlog_channel_t ch,
char *__restrict__ const linebuf,
const size_t lenline,
const char *fmt,
va_list ap)
{
int i = 0;
struct tm tm;
const time_t t = time(NULL);
__stdlog_timesub(&t, 0, &tm);
i += __stdlog_formatTimestamp3164(&tm, linebuf+i);
__STDLOG_STRBUILD_ADD_CHAR(linebuf, lenline, i, ' ');
__stdlog_fmt_print_str(linebuf, lenline-i, &i, ch->ident);
__STDLOG_STRBUILD_ADD_CHAR(linebuf, lenline, i, ':');
__STDLOG_STRBUILD_ADD_CHAR(linebuf, lenline, i, ' ');
/* note: we do not need to reserve space for '\0', as we
* will overwrite it with the '\n' below. We don't need
* a string, just a buffer, so we don't need '\0'!
*/
i += ch->f_vsnprintf(linebuf+i, lenline-i, fmt, ap);
linebuf[i++] = '\n'; /* space reserved -- see above */
return i;
}
static void
file_init(stdlog_channel_t ch)
{
ch->d.file.fd = -1;
ch->d.file.name = strdup(ch->spec+5);
}
static void
file_open(stdlog_channel_t ch)
{
if (ch->d.file.fd == -1) {
if((ch->d.file.fd = open(ch->d.file.name, O_WRONLY|O_CREAT|O_APPEND, 0660)) < 0)
return;
}
}
static void
file_close(stdlog_channel_t ch)
{
if (ch->d.file.fd >= 0) {
close(ch->d.file.fd);
ch->d.file.fd = -1;
}
}
static int
file_log(stdlog_channel_t ch, int __attribute__((unused)) severity,
const char *fmt, va_list ap,
char *__restrict__ const wrkbuf, const size_t buflen)
{
ssize_t lenWritten;
size_t lenline;
int r;
if(ch->d.file.fd < 0)
file_open(ch);
if(ch->d.file.fd < 0) {
r = -1;
goto done;
}
lenline = build_file_line(ch, wrkbuf, buflen, fmt, ap);
lenWritten = write(ch->d.file.fd, wrkbuf, lenline);
if(lenWritten == -1) {
r = -1;
} else if(lenWritten != (ssize_t) lenline) {
r = -1;
errno = EAGAIN;
} else {
r = 0;
}
done: return r;
}
void
__stdlog_set_file_drvr(stdlog_channel_t ch)
{
ch->drvr.init = file_init;
ch->drvr.open = file_open;
ch->drvr.close = file_close;
ch->drvr.log = file_log;
}
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