#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <strings.h>
#include <stdarg.h>

#define LOG_NONE  0x0
#define LOG_DEBUG 0x1
#define LOG_INFO  0x2

int global_log_level=0;

/* [INFO] msg ... */
/* [DEBUG] msg ... */

void mylog(int log_level, const char *format,...)
{
    /* Variadic argument in C : */
    /* https://www.cprogramming.com/tutorial/c/lesson17.html */

    va_list argList;
    va_start(argList,format);

    if (global_log_level & log_level) {
        switch(log_level ) {
        case LOG_INFO:
            fprintf(stderr,"[INFO] ");
            break;
        case LOG_DEBUG:
            fprintf(stderr,"[DEBUG] ");
            break;
        default:
            break;
        }
        vfprintf(stderr,format,argList);
    }
    va_end(argList);
}