log.h

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#pragma once

#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


/* ==================================================
 *  Logging functions
================================================== */

// MAX ERROR MESSAGE LENGTH
#define MSG_LEN 256
static char cstr[MSG_LEN];

// Error Message
#define ERR(flag, fmt, ...) \
    do { \
        snprintf(cstr, sizeof(cstr), "[%s:%d]: " fmt, __func__, __LINE__, ##__VA_ARGS__); \
        switch (flag)    \
        { \
            case 0:  { break;} \
            case 1:  { printf("[ERROR]%s\n", cstr); } \
            default: { syslog(LOG_ERR, "%s", cstr); break; } \
        } \
    } while (0)

// Normal Message
#define LOG(flag, fmt, ...) \
    do { \
        snprintf(cstr, sizeof(cstr), "[%s:%d]: " fmt, __func__, __LINE__, ##__VA_ARGS__); \
        switch (flag)    \
        { \
            case 0:  { break;} \
            case 1:  { printf("[LOG]%s\n", cstr); } \
            default: { syslog(LOG_INFO, "%s", cstr); break; } \
        } \
    } while (0)

// FUNCTION BEGIN
#define BEGIN(flag) \
    do { \
        snprintf(cstr, sizeof(cstr), "[BEGIN][%s:%d]", __func__, __LINE__); \
        switch (flag)    \
        { \
            case 0:  { break;} \
            case 1:  { printf("%s\n", cstr); } \
            default: { syslog(LOG_DEBUG, "%s", cstr); break; } \
        } \
    } while (0)

// FUNCTION END
#define END(flag) \
    do { \
        snprintf(cstr, sizeof(cstr), "[END][%s:%d]", __func__, __LINE__); \
        switch (flag)    \
        { \
            case 0:  { break;} \
            case 1:  { printf("%s\n", cstr); } \
            default: { syslog(LOG_DEBUG, "%s", cstr); break; } \
        } \
    } while (0)