LINUX C 读写修改删除配置文件函数

原文地址：http://blog.csdn.net/mochouxiyan/archive/2008/09/14/2913825.aspx

*从配置文件中读取相应的值

*输入参数：1，配置文件路径 2，匹配标记 3，输出存储空间

*并且排除了空行，"="前后无内容，无"="的情况

*/

ReadConfig(char *conf_path,char *conf_name,char *config_buff)

{

char config_linebuf[256];

char line_name[40];

char exchange_buf[256];

char *config_sign = "=";

char *leave_line;

FILE *f;

f = fopen(conf_path,"r");

if(f == NULL)

{

printf("OPEN CONFIG FALID/n");

return 0;

}

fseek(f,0,SEEK_SET);

while(fgets(config_linebuf,256,f) != NULL)

{

if(strlen(config_linebuf) < 3) //判断是否是空行

{

continue;

}

if (config_linebuf[strlen(config_linebuf)-1] == 10) //去除最后一位是/n的情况

{

memset(exchange_buf,0,sizeof(exchange_buf));

strncpy(exchange_buf,config_linebuf,strlen(config_linebuf)-1);

memset(config_linebuf,0,sizeof(config_linebuf));

strcpy(config_linebuf,exchange_buf);

}

memset(line_name,0,sizeof(line_name));

leave_line = strstr(config_linebuf,config_sign);

if(leave_line == NULL) //去除无"="的情况

{

continue;

}

int leave_num = leave_line - config_linebuf;

strncpy(line_name,config_linebuf,leave_num);

if(strcmp(line_name,conf_name) ==0)

{

strncpy(config_buff,config_linebuf+(leave_num+1),strlen(config_linebuf)-leave_num-1);

break;

}

if(fgetc(f)==EOF)

{

break;

}

fseek(f,-1,SEEK_CUR);

memset(config_linebuf,0,sizeof(config_linebuf));

}

fclose(f);

}

/*

*添加修改文件（当配置文件中存在标记字段，则进行修改，若不存在则进行添加）

*

*输入参数：1，配置文件路径 2，匹配标记 3，替换或添加的内容

*

*/

AddOrAltConfig(char *conf_path,char *conf_name,char *config_buff)

{

char config_linebuf[256];

char line_name[40];

char *config_sign = "=";

char *leave_line;

int alter_sign = 0;

FILE *f;

f = fopen(conf_path,"r+");

if(f == NULL)

{

printf("OPEN CONFIG FALID/n");

return 0;

}

fseek(f,0,SEEK_END);

long congig_lenth = ftell(f);

int configbuf_lenth = strlen(config_buff);

configbuf_lenth = configbuf_lenth + 5;

char sum_buf[congig_lenth+configbuf_lenth];

memset(sum_buf,0,sizeof(sum_buf));

fseek(f,0,SEEK_SET);

while(fgets(config_linebuf,256,f) != NULL)

{

if(strlen(config_linebuf) < 3) //判断是否是空行

{

strcat(sum_buf,config_linebuf);

continue;

}

leave_line = NULL;

leave_line = strstr(config_linebuf,config_sign);

if(leave_line == NULL) //去除无"="的情况

{

strcat(sum_buf,config_linebuf);

continue;

}

int leave_num = leave_line - config_linebuf;

memset(line_name,0,sizeof(line_name));

strncpy(line_name,config_linebuf,leave_num);

if(strcmp(line_name,conf_name) ==0)

{

strcat(sum_buf,config_buff);

strcat(sum_buf,"/n");

alter_sign = 1;

}

else

{

strcat(sum_buf,config_linebuf);

}

if(fgetc(f)==EOF)

{

break;

}

fseek(f,-1,SEEK_CUR);

memset(config_linebuf,0,sizeof(config_linebuf));

}

if(alter_sign == 0)

{

strcat(sum_buf,config_buff);

strcat(sum_buf,"/n");

}

printf("---sum_buf---->%s<----------/n",sum_buf);

remove(conf_path);

fclose(f);

FILE *fp;

fp = fopen(conf_path,"w+");

if(fp == NULL)

{

printf("OPEN CONFIG FALID/n");

return 2;

}

fseek(fp,0,SEEK_SET);

fputs(sum_buf,fp);

fclose(fp);

}

/*

*删除配置文件内容（

*

*输入参数：1，配置文件路径 2，匹配标记

*

*/

DeleteConfig(char *conf_path,char *conf_name)

{

char config_linebuf[256];

char line_name[40];

char *config_sign = "=";

char *leave_line;

FILE *f;

f = fopen(conf_path,"r+");

if(f == NULL)

{

printf("OPEN CONFIG FALID/n");

return 0;

}

fseek(f,0,SEEK_END);

long congig_lenth = ftell(f);

char sum_buf[congig_lenth+2];

memset(sum_buf,0,sizeof(sum_buf));

fseek(f,0,SEEK_SET);

while(fgets(config_linebuf,256,f) != NULL)

{

if(strlen(config_linebuf) < 3) //判断是否是空行

{

strcat(sum_buf,config_linebuf);

continue;

}

leave_line = NULL;

leave_line = strstr(config_linebuf,config_sign);

if(leave_line == NULL) //去除无"="的情况

{

strcat(sum_buf,config_linebuf);

continue;

}

int leave_num = leave_line - config_linebuf;

memset(line_name,0,sizeof(line_name));

strncpy(line_name,config_linebuf,leave_num);

if(strcmp(line_name,conf_name) ==0)

{

}

else

{

strcat(sum_buf,config_linebuf);

}

if(fgetc(f)==EOF)

{

break;

}

fseek(f,-1,SEEK_CUR);

memset(config_linebuf,0,sizeof(config_linebuf));

}

printf("---sum_buf---->%s<----------/n",sum_buf);

remove(conf_path);

fclose(f);

FILE *fp;

fp = fopen(conf_path,"w+");

if(fp == NULL)

{

printf("OPEN CONFIG FALID/n");

return 2;

}

fseek(fp,0,SEEK_SET);

fputs(sum_buf,fp);

fclose(fp);

}

Powered by Zoundry Raven