Logging library for C [closed]

Question

I am looking for a productive and simple logging library for C, which can output the log to a file. Displaying messages in the log I want to make like this:

date-time tag message

It would be nice to control the level of detail of messages and control the size of the file.

I found two projects that are suitable for me. It log4c and nglogc.

log4c seemed too big. nglogc quite fit, but also has a redundant functional. maybe you tell me more variants?

Answer 1

You can use this

File logger.h

#ifndef LOGGER_H
#define LOGGER_H

void logger(const char* tag, const char* message);

#endif /* LOG_H */

File logger.c

#include "logger.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void logger(const char* tag, const char* message) {
   time_t now;
   time(&now);
   printf("%s [%s]: %s\n", ctime(&now), tag, message);
}

It's probably not perfect, but it does satisfy the needs as you have presented them.

Answer 2

I suggest the log library which is written by myself --- zlog!

The way to fit your need in zlog is:

$ vi /etc/zlog.conf
[formats]
simple = "%D %c %m%n"
# don't know what the tag mean in your question, so put category of zlog instead
# log level is also available here, add %V means level

[rules]
my_cat.*   "xxx.log"; simple

$ vi hello.c
#include <stdio.h> 
#include "zlog.h"

int main(int argc, char** argv)
{
int rc;
zlog_category_t *c;

rc = dzlog_init("/etc/zlog.conf", "my_cat");
if (rc) {
    printf("init failed\n");
    return -1;
}

zlog_info(c, "hello, zlog");

zlog_fini();

return 0;
} 

It will generate xxx.log in current directory as

2012-09-30 07:22:50 my_cat hello, zlog

Links:

Download: https://github.com/HardySimpson/zlog/archive/latest-stable.tar.gz

UsersGuide: http://hardysimpson.github.com/zlog/UsersGuide-EN.html

Hompage: http://hardysimpson.github.com/zlog/