aben20807 / miniclog

A mini C logger with file stream handler, output filter, and user-defined format

miniclog

Simple logger with file stream handler, output filter, and user-defined format. Inspired by https://github.com/sysprog21/threaded-logger and logging package of Python

Features

• file stream handler
• output filter
• user-defined format

Examples

• file_stream_handler:

#include <stdio.h>
#include "../miniclog.h"

int main(int argc, char *argv[]) {

    logger_st* l = logger_init();
    handler_st* h1 = handler_init(stdout, MINICLOG_NOTSET);
    handler_st* h2 = handler_init(stderr, MINICLOG_NOTSET);
    add_handler(l, h1);
    add_handler(l, h2);
    LOG_INFO(l, "OuO number: %d\n", 42);
    logger_deinit(l);
    return 0;
}

$ cd examples
$ make file_stream_handler
$ ./file_stream_handler
OuO number: 42
OuO number: 42

• output_filter:

#include <stdio.h>
#include "../miniclog.h"

bool foo(logger_level_et level, const char *msg) {
    if (level < MINICLOG_DEBUG) {
        return false;
    }
    return true;
}

bool bar(logger_level_et level, const char *msg) {
    if (starts_with(msg, "OuO")) {
        return true;
    }
    return false;
}

int main(int argc, char *argv[]) {

    logger_st* l = logger_init();
    handler_st* h1 = handler_init(stdout, MINICLOG_NOTSET);
    add_filter(h1, foo);
    add_filter(h1, bar);
    add_handler(l, h1);
    LOG(l, "OuO number 1: %d\n", 42); // skipped because of foo
    LOG_INFO(l, "OuO number 2: %d\n", 42);
    logger_deinit(l);
    return 0;
}

$ cd examples
$ make output_filter
$ ./output_filter
OuO number 2: 42

• user_defined_format:

#include <stdio.h>
#include "../miniclog.h"

int main(int argc, char *argv[]) {

    logger_st* l = logger_init();
    handler_st* h1 = handler_init(stdout, MINICLOG_NOTSET);
    set_format(h1, "[%(time)] [%(level)] %(file):%(func):%(line):%(message)");
    add_handler(l, h1);
    LOG_INFO(l, "OuO number: %d\n", 42);
    logger_deinit(l);
    return 0;
}

$ cd examples
$ make user_defined_format
$ ./user_defined_format
[2022-06-03 14:57:41] [INFO] user_defined_format.c:main:10:OuO number: 42