调试信息：linux彩色调试信息的输出

一 printf实现的宏

测试代码： 

#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>

#define ESC_START     "\033["
#define ESC_END       "\033[0m"
#define COLOR_FATAL   "31;40;5m"
#define COLOR_ALERT   "31;40;1m"
#define COLOR_CRIT    "31;40;1m"
#define COLOR_ERROR   "31;40;1m"
#define COLOR_WARN    "33;40;1m"
#define COLOR_NOTICE  "34;40;1m"
#define COLOR_INFO    "32;40;1m"
#define COLOR_DEBUG   "36;40;1m"
#define COLOR_TRACE   "37;40;1m"

#define MSG_INFO(format, ...) printf(ESC_START COLOR_INFO"%s:%d -- " format "\n" ESC_END, __func__, __LINE__,##__VA_ARGS__)

#define MSG_DEBUG(format, ...) printf(ESC_START COLOR_DEBUG "%s:%d -- " format "\n" ESC_END, __func__, __LINE__,##__VA_ARGS__)

#define MSG_WARN(format, ...) printf(ESC_START COLOR_WARN "%s:%d -- " format "\n" ESC_END, __func__, __LINE__,##__VA_ARGS__)

#define MSG_ERROR(format, ...) printf(ESC_START COLOR_ERROR  "%s:%d -- " format "\n" ESC_END, __func__, __LINE__,##__VA_ARGS__)

int main(int argc, char **argv)
{
    struct passwd *p = getpwent();
    if(!p){
        perror("getpwent");
        exit(1);
    }
    
    MSG_INFO("hello ");
    MSG_DEBUG("hello ");
    MSG_WARN("hello ");
    MSG_ERROR("hello ");
    return 0;
}

测试结果：

 是不是真的很漂亮。

二 自定义的输出函数

测试代码：

#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#define ESC_START     "\033["
#define ESC_END       "\033[0m"
#define COLOR_FATAL   "31;40;5m"
#define COLOR_ALERT   "31;40;1m"
#define COLOR_CRIT    "31;40;1m"
#define COLOR_ERROR   "31;40;1m"
#define COLOR_WARN    "33;40;1m"
#define COLOR_NOTICE  "34;40;1m"
#define COLOR_INFO    "32;40;1m"
#define COLOR_DEBUG   "36;40;1m"
#define COLOR_TRACE   "37;40;1m"

#define APP_LOG_LEVEL_INFO    0x00
#define APP_LOG_LEVEL_DEBUG   0x01
#define APP_LOG_LEVEL_WARNING 0x02
#define APP_LOG_LEVEL_ERROR   0x03
#define APP_LOG_LEVEL_FATAL   0x04

#define APP_DEFAULT_LOG_LEVEL APP_LOG_LEVEL_INFO

static int32_t log_level = APP_LOG_LEVEL_INFO;

void app_log (int32_t level, const char * fmt, ...)
{
   va_list list;
	//this is log
   if (level >= log_level)
   {
      va_start (list, fmt);
      vprintf (fmt, list);
      va_end (list);
      fflush (stdout);
   }
}

// printf(ESC_START COLOR_INFO"%s:%d -- " format "\n" ESC_END, __func__, __LINE__,##__VA_ARGS__)

#define _APP_LOG_INFO(level, ...) \
    do{\
        app_log(level,ESC_START COLOR_INFO"%s:%d -- ",__func__,__LINE__);  \
        app_log (level, __VA_ARGS__);   \
        app_log(level,"\n" ESC_END);  \
    }while(0)

#define _APP_LOG_DEBUG(level, ...) \
    do{\
        app_log(level,ESC_START COLOR_DEBUG"%s:%d -- ",__func__,__LINE__);  \
        app_log (level, __VA_ARGS__);   \
        app_log(level,"\n" ESC_END);  \
    }while(0)

#define _APP_LOG_WARNING(level, ...) \
    do{\
        app_log(level,ESC_START COLOR_WARN"%s:%d -- ",__func__,__LINE__);  \
        app_log (level, __VA_ARGS__);   \
        app_log(level,"\n" ESC_END);  \
    }while(0)

#define _APP_LOG_ERROR(level, ...) \
    do{\
        app_log(level,ESC_START COLOR_ERROR"%s:%d -- ",__func__,__LINE__);  \
        app_log (level, __VA_ARGS__);   \
        app_log(level,"\n" ESC_END);  \
    }while(0)

#define _APP_LOG_FATAL(level, ...) \
    do{\
        app_log(level,ESC_START COLOR_FATAL"%s:%d -- ",__func__,__LINE__);  \
        app_log (level, __VA_ARGS__);   \
        app_log(level,"\n" ESC_END);  \
        exit(EXIT_FAILURE); \
    }while(0)

#define APP_LOG_DEBUG(...)   _APP_LOG_DEBUG (APP_LOG_LEVEL_DEBUG, __VA_ARGS__)
#define APP_LOG_INFO(...)    _APP_LOG_INFO (APP_LOG_LEVEL_INFO, __VA_ARGS__)
#define APP_LOG_WARNING(...) _APP_LOG_WARNING (APP_LOG_LEVEL_WARNING, __VA_ARGS__)
#define APP_LOG_ERROR(...)   _APP_LOG_ERROR (APP_LOG_LEVEL_ERROR, __VA_ARGS__)
#define APP_LOG_FATAL(...)   _APP_LOG_FATAL (APP_LOG_LEVEL_FATAL, __VA_ARGS__)

int main(int argc, char **argv)
{
    struct passwd *p = getpwent();
    if(!p){
        perror("getpwent");
        exit(1);
    }

    
    APP_LOG_INFO("hello ");
    APP_LOG_DEBUG("hello ");
    APP_LOG_WARNING("hello ");
    APP_LOG_ERROR("hello");
    APP_LOG_FATAL("hello");
    return 0;
}

测试效果：

小结