Linux C 读写修改删除配置文件函数

/*  *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); }