C logger

0.1

Author:

Mao Yu (http://www.mao-yu.com)

Date:

Created: Saturday, June 19, 2010

Updated: Saturday, June 26, 2010

Purpose:

Provides a simple interface to log messages to file, console, and/or a callback. Useful for debugging purposes or as a general logging interface to simple apps.

Installation:

1. Downloads:
   • tarball.
   • zip.
2. Add header and source file to your project
   • logger.h
   • logger.c

Usage:

• Call log_init() to initializing logging to different interfaces
• Optionally Use log_setlevel(), log_setlevel_file(), log_setlevel_console(), and log_setlevel_cb() to set a logging level
• Optionally create a macro to wrap log_log(). Example:

   #  define LOG(LVL,...) log_log(LVL,__FILE__,_FUNCTION__ ,__LINE__,__VA_ARGS__)
  

• Use the log_log() function to log messages in a printf format
• Call log_end() to close logging interface

An example program:

 #include <stdio.h>
 #include "logger.h"
 #define LOG(LVL,...) log_log(LVL,__FILE__,__FUNCTION__ ,__LINE__,__VA_ARGS__)

 void test_cb(LogStr msg){
        printf("-+-+-+");
        fputs(msg,stdout);
 }

 int main(int argc, char *argv[]){
        if( log_init("test.log",LOGBOOL_FALSE,test_cb) != LOGRET_OK )
                return -1;

        LOG(1,"---Testing logging functionality!");
        LOG(11,"---Can't see this! (log level is higher than default)");

        log_setlevel(11);
        LOG(11,"---Now can see this!");

        log_setlevel_console(10);
        LOG(11,"---Now only shown in file and cb!");

        log_end();
 }

Running this program will result in this in the console:

logger.c(206)[main]---Testing logging functionality!
-+-+-+logger.c(206)[main]---Testing logging functionality!
logger.c(210)[main]---Now can see this!
-+-+-+logger.c(210)[main]---Now can see this!
-+-+-+logger.c(213)[main]---Now only shown in file and cb!

And show this in test.log

logger.c(206)[main]---Testing logging functionality!
logger.c(210)[main]---Now can see this!
logger.c(213)[main]---Now only shown in file and cb!

See here for full API documentation.

License

This is public domain code