hlswmaster/logging.c

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/***************************************************************************
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* Copyright (C) 06/2006 by Olaf Rempel *
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* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
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#include "logging.h"
#define BUFSIZE 8192
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static FILE *log_fd = NULL;
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static char *buffer = NULL;
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void log_print(int prio, const char *fmt, ...)
{
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va_list az;
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int len;
if (buffer == NULL) {
buffer = malloc(BUFSIZE);
if (buffer == NULL) {
fprintf(stderr, "log_print: out of memory\nBailing out!\n");
exit(-1);
}
}
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va_start(az, fmt);
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len = vsnprintf(buffer, BUFSIZE, fmt, az);
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va_end(az);
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if (len < 0 || len >= BUFSIZE) {
log_print(LOG_ERROR, "log_print: arguments too long");
errno = 0;
return;
}
if (errno) {
strncpy(buffer + len, ": ", BUFSIZE - len);
len += 2;
strncpy(buffer + len, strerror(errno), BUFSIZE - len);
}
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if (log_fd) {
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char tbuf[64];
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time_t tzgr;
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time(&tzgr);
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strftime(tbuf, sizeof(tbuf), "%b %d %H:%M:%S :", localtime(&tzgr));
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fprintf(log_fd, "%s %s\n", tbuf, buffer);
fflush(log_fd);
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} else {
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fprintf(stderr, "%s\n", buffer);
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}
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errno = 0;
}
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static void log_close(void)
{
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if (buffer)
free(buffer);
fclose(log_fd);
}
int log_init(char *logfile)
{
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log_fd = fopen(logfile, "a");
if (log_fd == NULL) {
log_print(LOG_ERROR, "log_open('%s'): %s", logfile);
return 0;
}
if (atexit(log_close) != 0) {
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log_print(LOG_ERROR, "log_open(): atexit()");
return 0;
}
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log_print(LOG_EVERYTIME, "==========================");
return 1;
}