Linux c 配置文件读取与修改

来源：互联网发布：东华软件邮箱编辑：程序博客网时间：2024/06/06 02:56
修改自某新手的有BUG的程序，新建个配置文件configure.cfg在当前目录,然后，然后复制代码去感受下吧
#include<stdio.h>#include<string.h>#include<stdlib.h>/*  *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 ,返回读取的变量  *并且排除了空行，“=”前后无内容，无“=”的情况  */ char * 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,"rw"); if(f == NULL)     {         printf("Open configure file fail!\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)-1);            break;         } if(fgetc(f)==EOF)         { break;           }         fseek(f,-1,SEEK_CUR);         memset(config_linebuf,0,sizeof(config_linebuf));     }     fclose(f); return config_buff;} /*  *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 configure fail!\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,conf_name);    strcat(sum_buf,"=");            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("---configure---->\n%s<----------\n",sum_buf);     remove(conf_path);     fclose(f);     FILE *fp;     fp = fopen(conf_path,"w+"); if(fp == NULL)     {         printf("Open configure fail!\n"); return 2;     }     fseek(fp,0,SEEK_SET);     fputs(sum_buf,fp);     fclose(fp); } int main(void){char* data;char* file = "./configure.cfg";data = ReadConfig(file,"id");printf("id = %s\n",data);AddOrAltConfig(file,"id","678");}
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