C语言分级日志输出实现Demo

/**************************************************************** ***Author: lishuangliang *** ***Email: [email protected] *** ***Date: 2018-09-24 *** ***Festivsl: Mid-autumn *** *****************************************************************/ #include <string.h> #include <errno.h> #include <stdio.h> #include <stdint.h> #include <stddef.h> #include <stdlib.h> #include <sys/stat.h> #include <sys/types.h> #include <stdarg.h> #include <stdbool.h> #include <sys/un.h> #include <sys/param.h> #include <time.h> //通过宏来控制是否打开日志输出 #ifdef DISABLE_DEBUG #define real_debug_level 0 #else #define real_debug_level debug_level #endif //定义日志输出级别 #define FATALEER (1<<0) #define ERROR (1<<1) #define WRAN (1<<2) #define INFO (1<<3) #define DEBUG (1<<4) #define WriteLog(level,mesg) log_mesg_printf(__FILE__, __LINE__, __func__, level, mesg) #define WriteLog2(level,format, arg...) log_mesg_printf2( __FILE__,__FUNCTION__, __LINE__, level, format, ##arg) int debug_level = 0; struct dbg { int level; const char *mesg; }; static struct dbg debug_level_table[] = { {FATALEER, "Config The Log Level as FATALEER"}, {ERROR, "Config The Log Level as ERROR"}, {WRAN, "Config The Log Level as WRAN"}, {INFO, "Config The Log Level as INFO"}, {DEBUG, "Config The Log Level as DEBUG"} }; void print_debug_usage(void) { struct dbg *p; fprintf(stderr, " To calculate the debug level, logically 'or'\n" " some of the following values together to get a debug level:\n"); for (p = debug_level_table; p < debug_level_table + (sizeof (debug_level_table) / sizeof (struct dbg)); p++) { fprintf(stderr, "\t%d:\t%s\n", p->level, p->mesg); } fprintf(stderr, "\n"); } void parse_debug(char *foo) { int i; struct dbg *p; if (!foo) return; fprintf(stderr, "Before parse_debug, debug_level is: %d\n", debug_level); i = atoi(foo); if(i == -1) { /* error */ fprintf(stderr, "Invalid level specified.\n"); exit(0); } for (p = debug_level_table;p < debug_level_table +(sizeof (debug_level_table) / sizeof (struct dbg)); p++) { if (i > 0) { if (i & p->level) { fprintf(stderr, "Enabling %s debug level.\n",p->mesg); debug_level |= p->level; } } } fprintf(stderr, "After parse_debug, debug_level is: %d\n", debug_level); } char *get_commonlog_time(void) { char *p; char sys_time[64]; time_t tnow = time(NULL); struct tm *ptm = localtime(&tnow); memset(sys_time, 0 ,sizeof(sys_time)); sprintf(sys_time, "%04d-%02d-%02d %02d:%02d:%02d",ptm->tm_year+1900 ,ptm->tm_mon+1 ,ptm->tm_mday ,ptm->tm_hour ,ptm->tm_min ,ptm->tm_sec); //return (char *)sys_time; p = sys_time; return p; } void log_mesg_printf(const char *file, int line, const char *func,int level, const char *mesg) { if(real_debug_level & level) { int errno_save = errno; fprintf(stderr, "%s%s:%d (%s) - ", get_commonlog_time(), file, line, func); errno = errno_save; perror(mesg); errno = errno_save; } } void log_mesg_printf2(const char *file,const char *func,const int line, int level, char *fmt,...) { if(real_debug_level & level) { char msg_buf[20*1024]; va_list ap; va_start(ap,fmt); sprintf(msg_buf,"[%s %s:%s:%d] ",get_commonlog_time(),file,func,line); vsprintf(msg_buf+strlen(msg_buf),fmt,ap); fprintf(stderr,"%s\n",msg_buf); va_end(ap); } } int main(int argc, char* argv[]) { #ifdef DISABLE_DEBUG print_debug_usage(); parse_debug(argv[1]);//解析日志打印输出级别 #endif //不使用可变参数解析样例 WriteLog(DEBUG,"I want to DEBUG"); WriteLog(INFO,"I want to INFO"); WriteLog(WRAN,"I want to WARN"); WriteLog(ERROR,"I want to ERROR"); WriteLog(FATALEER,"I want to FATALEER"); //使用可变参数解析样例 WriteLog2(DEBUG,"I want to %s which level is %d","DEBUG",DEBUG); WriteLog2(INFO,"I want to %s which level is %d","INFO",INFO); WriteLog2(WRAN,"I want to %s which level is %d","WRAN",WRAN); WriteLog2(ERROR,"I want to %s which level is %d","ERROR",ERROR); WriteLog2(FATALEER,"I want to %s which level is %d","FATALEER",FATALEER); return 0; }