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用C语言打印日志（Log）

2018年09月12日  | 移动技术网IT编程  | 我要评论

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用c语言打印日志（log）

直接上源代码。

log.h 文件：

/** log.h **/  
  
#ifndef __log_h__  
#define __log_h__  
#include "stdio.h"  
#include "string.h"  
#include "stdlib.h"  
#include "time.h"  
#include "stdarg.h"  
#include "unistd.h"  
  
#define maxlen (2048)  
#define maxfilepath (512)  
#define maxfilename (50)  
typedef enum{  
    error_1=-1,  
    error_2=-2,  
    error_3=-3  
}error0;  
  
  
typedef enum{  
    none=0,  
    info=1,  
    debug=2,  
    warn=3,  
    error=4,  
    all=255  
}loglevel;  
  
typedef struct log{  
    char logtime[20];  
    char filepath[maxfilepath];  
    file *logfile;  
}log;  
  
typedef struct logseting{  
    char filepath[maxfilepath];  
    unsigned int maxfilelen;  
    unsigned char loglevel;  
}logset;  
  
int logwrite(unsigned char loglevel,char *fromat,...);  
#endif /* __log_h__ */

log.c 文件：

/** log.c **/  
  
#include "log.h"  
#define maxlevelnum (3)  
  
logset logsetting;  
log loging;  
  
const static char logleveltext[4][10]={"info","debug","warn","error"};  
  
static char * getdate(char *date);  
  
static unsigned char getcode(char *path){  
    unsigned char code=255;  
    if(strcmp("info",path)==0)  
        code=1;  
    else if(strcmp("warn",path)==0)  
        code=3;  
    else if(strcmp("error",path)==0)  
        code=4;  
    else if(strcmp("none",path)==0)  
        code=0;  
    else if(strcmp("debug",path)==0)  
        code=2;  
    return code;  
}  
  
static unsigned char readconfig(char *path){  
    char value[512]={0x0};  
    char data[50]={0x0};  
  
    file *fpath=fopen(path,"r");  
    if(fpath==null)  
        return -1;  
    fscanf(fpath,"path=%s\n",value);  
    getdate(data);  
    strcat(data,".log");  
    strcat(value,"/");  
    strcat(value,data);  
    if(strcmp(value,logsetting.filepath)!=0)  
        memcpy(logsetting.filepath,value,strlen(value));  
    memset(value,0,sizeof(value));  
  
    fscanf(fpath,"level=%s\n",value);  
    logsetting.loglevel=getcode(value);  
    fclose(fpath);  
    return 0;  
}  
/* 
 *日志设置信息 
 * */  
static logset *getlogset(){  
    char path[512]={0x0};  
    getcwd(path,sizeof(path));  
    strcat(path,"/log.conf");  
    if(access(path,f_ok)==0){  
        if(readconfig(path)!=0){  
            logsetting.loglevel=info;  
            logsetting.maxfilelen=4096;  
        }  
    }else{  
        logsetting.loglevel=info;  
        logsetting.maxfilelen=4096;  
    }  
    return &logsetting;  
}  
  
/* 
 *获取日期 
 * */  
static char * getdate(char *date){  
    time_t timer=time(null);  
    strftime(date,11,"%y-%m-%d",localtime(&timer));  
    return date;  
}  
  
/* 
 *获取时间 
 * */  
static void settime(){  
    time_t timer=time(null);  
    strftime(loging.logtime,20,"%y-%m-%d %h:%m:%s",localtime(&timer));  
}  
  
/* 
 *不定参打印 
 * */  
static void printflog(char * fromat,va_list args){  
    int d;  
    char c,*s;  
    while(*fromat)  
    {  
        switch(*fromat){  
            case 's':{  
                s = va_arg(args, char *);  
                fprintf(loging.logfile,"%s",s);  
                break;}  
            case 'd':{  
                d = va_arg(args, int);  
                fprintf(loging.logfile,"%d",d);  
                break;}  
            case 'c':{  
                c = (char)va_arg(args, int);  
                fprintf(loging.logfile,"%c",c);  
                break;}  
            default:{  
                if(*fromat!='%'&&*fromat!='\n')  
                    fprintf(loging.logfile,"%c",*fromat);  
                break;}  
        }  
        fromat++;  
    }  
    fprintf(loging.logfile,"%s","]\n");  
}  
  
static int initlog(unsigned char loglevel){  
    char strdate[30]={0x0};  
    logset *logsetting;  
    //获取日志配置信息  
    if((logsetting=getlogset())==null){  
        perror("get log set fail!");  
        return -1;  
    }  
    if((loglevel&(logsetting->loglevel))!=loglevel)  
        return -1;  
  
    memset(&loging,0,sizeof(log));  
    //获取日志时间  
    settime();  
    if(strlen(logsetting->filepath)==0){  
        char *path=getenv("home");  
        memcpy(logsetting->filepath,path,strlen(path));  
  
        getdate(strdate);  
        strcat(strdate,".log");  
        strcat(logsetting->filepath,"/");  
        strcat(logsetting->filepath,strdate);  
    }  
    memcpy(loging.filepath,logsetting->filepath,maxfilepath);  
    //打开日志文件  
    if(loging.logfile==null)  
        loging.logfile=fopen(loging.filepath,"a+");  
    if(loging.logfile==null){  
        perror("open log file fail!");  
        return -1;  
    }  
    //写入日志级别，日志时间  
    fprintf(loging.logfile,"[%s] [%s]:[",logleveltext[loglevel-1],loging.logtime);  
    return 0;  
}  
  
/* 
 *日志写入 
 * */  
int logwrite(unsigned char loglevel,char *fromat,...){  
    va_list args;  
    //初始化日志  
    if(initlog(loglevel)!=0)  
        return -1;  
    //打印日志信息  
    va_start(args,fromat);  
    printflog(fromat,args);  
    va_end(args);  
    //文件刷出  
    fflush(loging.logfile);  
    //日志关闭  
    if(loging.logfile!=null)  
        fclose(loging.logfile);  
    loging.logfile=null;  
    return 0;  
}

test.c 文件：

/** test.c **/  
  
#include "stdio.h"  
#include "stdlib.h"  
#include "log.h"  
int main(int argv,char**argc){  
    printf("%s\n",argc[0]);  
    logwrite(info,"%s","hello world!");  
    logwrite(debug,"%s","h.e.l.l.o w.o.r.l.d!");  
    logwrite(warn,"%s","h e l l o w o r l d!");  
    logwrite(error,"%s","hallo world!");  
    return 0;  
}

log.conf 文件：

path=./temp  
level=all

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