轻量级c语言开源日志库log.c介绍 - 实现不同级别和参数化日志打印

                    
                        
                    
                    前言 
c语言没有现成的日志库，如果要记录日志，需要自己封装一个日志库。如果要实现日志级别和参数打印，还是比较麻烦的，正好在github找到了一个c语言开源日志库，可以实现日志级别打印，参数打印，而且还会记录日期和行号，最重要的是代码非常少，只有100多行，可以直接包含在我们自己的工程代码中，不需要任何依赖。
 
源码地址 
github源码连接
 
使用介绍 
直接把工程目录下的log.c和log.h下载下来，包含到工程代码中即可，没有其他依赖。
日志级别由低到高，分别为 LOG_TRACE、LOG_DEBUG、LOG_INFO、LOG_WARN、LOG_ERROR、LOG_FATAL
如果设置日志级别为LOG_TRACE，则所有级别日志都会打印，如果设置日志级别为LOG_WARN，则只会打印LOG_WARN以及更高级别(即LOG_ERROR和LOG_FATAL)的日志
 
演示 
测试代码 
   #include "log.h"#include intmain(){
      FILE *fp =fopen("log.txt","a+");if(fp ==NULL){printf("create log file failed.\n");return-1;}//设置日志级别(在终端打印)log_set_level(LOG_TRACE);//设置日志级别(在文件中打印)log_add_fp(fp, LOG_INFO);log_trace("start trace.");log_debug("start debug.");log_info("start info.");log_warn("start warn.");log_error("start error.");log_fatal("start fatal");// 支持参数打印log_info("number is %d, string is %s",10010,"helloword");fclose(fp);}
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演示效果
 
 
源码 
如果访问github有问题，我把源码贴到下面了。
log.h 
   #ifndef LOG_H#define LOG_H#include #include #include #include #define LOG_VERSION "0.1.0"typedefstruct{
      va_list ap;constchar*fmt;constchar*file;structtm*time;void*udata;int line;int level;} log_Event;typedefvoid(*log_LogFn)(log_Event *ev);typedefvoid(*log_LockFn)(bool lock,void*udata);enum{ LOG_TRACE, LOG_DEBUG, LOG_INFO, LOG_WARN, LOG_ERROR, LOG_FATAL };#define log_trace(...) log_log(LOG_TRACE, __FILE__, __LINE__, __VA_ARGS__)#define log_debug(...) log_log(LOG_DEBUG, __FILE__, __LINE__, __VA_ARGS__)#define log_info(...)  log_log(LOG_INFO,  __FILE__, __LINE__, __VA_ARGS__)#define log_warn(...)  log_log(LOG_WARN,  __FILE__, __LINE__, __VA_ARGS__)#define log_error(...) log_log(LOG_ERROR, __FILE__, __LINE__, __VA_ARGS__)#define log_fatal(...) log_log(LOG_FATAL, __FILE__, __LINE__, __VA_ARGS__)constchar*log_level_string(int level);voidlog_set_lock(log_LockFn fn,void*udata);voidlog_set_level(int level);voidlog_set_quiet(bool enable);intlog_add_callback(log_LogFn fn,void*udata,int level);intlog_add_fp(FILE *fp,int level);voidlog_log(int level,constchar*file,int line,constchar*fmt,...);#endif
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log.c 
   #include "log.h"#define MAX_CALLBACKS 32typedefstruct{
      log_LogFn fn;void*udata;int level;} Callback;staticstruct{void*udata;
      log_LockFn lock;int level;
      bool quiet;
      Callback callbacks[MAX_CALLBACKS];} L;staticconstchar*level_strings[]={"TRACE","DEBUG","INFO","WARN","ERROR","FATAL"};#ifdef LOG_USE_COLORstaticconstchar*level_colors[]={"\x1b[94m","\x1b[36m","\x1b[32m","\x1b[33m","\x1b[31m","\x1b[35m"};#endifstaticvoidstdout_callback(log_Event *ev){char buf[16];
      buf[strftime(buf,sizeof(buf),"%H:%M:%S", ev->time)]='\0';#ifdef LOG_USE_COLORfprintf(ev->udata,"%s %s%-5s\x1b[0m \x1b[90m%s:%d:\x1b[0m ", buf, level_colors[ev->level], level_strings[ev->level], ev->file, ev->line);#elsefprintf(ev->udata,"%s %-5s %s:%d: ", buf, level_strings[ev->level], ev->file, ev->line);#endifvfprintf(ev->udata, ev->fmt, ev->ap);fprintf(ev->udata,"\n");fflush(ev->udata);}staticvoidfile_callback(log_Event *ev){char buf[64];
      buf[strftime(buf,sizeof(buf),"%Y-%m-%d %H:%M:%S", ev->time)]='\0';fprintf(ev->udata,"%s %-5s %s:%d: ", buf, level_strings[ev->level], ev->file, ev->line);vfprintf(ev->udata, ev->fmt, ev->ap);fprintf(ev->udata,"\n");fflush(ev->udata);}staticvoidlock(void){if(L.lock){ 
          L.lock(true, L.udata);}}staticvoidunlock(void){if(L.lock){ 
          L.lock(false, L.udata);}}constchar*log_level_string(int level){return level_strings[level];}voidlog_set_lock(log_LockFn fn,void*udata){
      L.lock = fn;
      L.udata = udata;}voidlog_set_level(int level){
      L.level = level;}voidlog_set_quiet(bool enable){
      L.quiet = enable;}intlog_add_callback(log_LogFn fn,void*udata,int level){for(int i =0; i < MAX_CALLBACKS; i++){if(!L.callbacks[i].fn){
              L.callbacks[i]=(Callback){ fn, udata, level };return0;}}return-1;}intlog_add_fp(FILE *fp,int level){returnlog_add_callback(file_callback, fp, level);}staticvoidinit_event(log_Event *ev,void*udata){if(!ev->time){time_t t =time(NULL);
          ev->time =localtime(&t);}
      ev->udata = udata;}voidlog_log(int level,constchar*file,int line,constchar*fmt,...){
      log_Event ev ={.fmt   = fmt,.file  = file,.line  = line,.level = level,};lock();if(!L.quiet && level >= L.level){init_event(&ev,stderr);va_start(ev.ap, fmt);stdout_callback(&ev);va_end(ev.ap);}for(int i =0; i < MAX_CALLBACKS && L.callbacks[i].fn; i++){
          Callback *cb =&L.callbacks[i];if(level >= cb->level){init_event(&ev, cb->udata);va_start(ev.ap, fmt);
              cb->fn(&ev);va_end(ev.ap);}}unlock();}
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windows平台编译时有报错，结构体赋值语法不支持，我做了修改。
修改后的 log.c 
   #include "log.h"#define MAX_CALLBACKS 32typedefstruct{
     log_LogFn fn;void*udata;int level;} Callback;staticstruct{void*udata;
     log_LockFn lock;int level;
     bool quiet;
     Callback callbacks[MAX_CALLBACKS];} L;staticconstchar*level_strings[]={"TRACE","DEBUG","INFO","WARN","ERROR","FATAL"};#ifdef LOG_USE_COLORstaticconstchar*level_colors[]={"\x1b[94m","\x1b[36m","\x1b[32m","\x1b[33m","\x1b[31m","\x1b[35m"};#endifstaticvoidstdout_callback(log_Event *ev){char buf[100]={0};time_t timep;time(&timep);structtm*pt =gmtime(&timep);sprintf(buf,"%d-%02d-%02d %02d:%02d:%02d",1900+ pt->tm_year,1+ pt->tm_mon, pt->tm_mday,(8+ pt->tm_hour)%24, pt->tm_min, pt->tm_sec);#ifdef LOG_USE_COLORfprintf((FILE *)ev->udata,"%s %s%-5s\x1b[0m \x1b[90m%s:%d:\x1b[0m ", buf, level_colors[ev->level], level_strings[ev->level], ev->file, ev->line);#elsefprintf((FILE *)ev->udata,"%s %-5s %s:%d: ", buf, level_strings[ev->level], ev->file, ev->line);#endifvfprintf((FILE *)ev->udata, ev->fmt, ev->ap);fprintf((FILE *)ev->udata,"\n");fflush((FILE *)ev->udata);}staticvoidfile_callback(log_Event *ev){char buf[100]={0};time_t timep;time(&timep);structtm*pt =gmtime(&timep);sprintf(buf,"%d-%02d-%02d %02d:%02d:%02d",1900+ pt->tm_year,1+ pt->tm_mon, pt->tm_mday,(8+ pt->tm_hour)%24, pt->tm_min, pt->tm_sec);fprintf((FILE *)ev->udata,"%s %-5s %s:%d: ", buf, level_strings[ev->level], ev->file, ev->line);vfprintf((FILE *)ev->udata, ev->fmt, ev->ap);fprintf((FILE *)ev->udata,"\n");fflush((FILE *)ev->udata);}staticvoidlock(void){if(L.lock){
         L.lock(true, L.udata);}}staticvoidunlock(void){if(L.lock){
         L.lock(false, L.udata);}}constchar*log_level_string(int level){return level_strings[level];}voidlog_set_lock(log_LockFn fn,void*udata){
     L.lock = fn;
     L.udata = udata;}voidlog_set_level(int level){ L.level = level;}voidlog_set_quiet(bool enable){ L.quiet = enable;}intlog_add_callback(log_LogFn fn,void*udata,int level){for(int i =0; i < MAX_CALLBACKS; i++){if(!L.callbacks[i].fn){
             L.callbacks[i].fn = fn;
             L.callbacks[i].udata = udata;
             L.callbacks[i].level = level;return0;}}return-1;}intlog_add_fp(FILE *fp,int level){returnlog_add_callback(file_callback, fp, level);}staticvoidinit_event(log_Event *ev,void*udata){if(!ev->time){time_t t =time(NULL);
         ev->time =gmtime(&t);}
     ev->udata = udata;}voidlog_log(int level,constchar*file,int line,constchar*fmt,...){
     log_Event ev;
     ev.fmt = fmt;
     ev.file = file;
     ev.line = line;
     ev.level = level;lock();if(!L.quiet && level >= L.level){init_event(&ev,stderr);va_start(ev.ap, fmt);stdout_callback(&ev);va_end(ev.ap);}for(int i =0; i < MAX_CALLBACKS && L.callbacks[i].fn; i++){
         Callback *cb =&L.callbacks[i];if(level >= cb->level){init_event(&ev, cb->udata);va_start(ev.ap, fmt);
             cb->fn(&ev);va_end(ev.ap);}}unlock();}
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原文地址：https://blog.csdn.net/new9232/article/details/132992574