Linux C 读写修改删除配置文件函数


  1. /*
  2.  *从配置文件中读取相应的值
  3.  *输入参数：1，配置文件路径 2，匹配标记 3，输出存储空间
  4.  *并且排除了空行，“=”前后无内容，无“=”的情况
  5.  */
  6. ReadConfig(char *conf_path,char *conf_name,char *config_buff)
  7. {
  8.     char config_linebuf[256];
  9.     char line_name[40];
  10.     char exchange_buf[256];
  11.     char *config_sign = "=";
  12.     char *leave_line;
  13.     FILE *f;
  14.     f = fopen(conf_path,"r");
  15.     if(f == NULL)
  16.     {
  17.         printf("OPEN CONFIG FALID\n");
  18.         return 0;
  19.     }
  20.     fseek(f,0,SEEK_SET); 
  21.     while(fgets(config_linebuf,256,f) != NULL)
  22.     {   
  23.         if(strlen(config_linebuf) < 3) //判断是否是空行
  24.         {
  25.             continue;
  26.         }
  27.         if (config_linebuf[strlen(config_linebuf)-1] == 10) //去除最后一位是\n的情况
  28.         {
  29.             
  30.             memset(exchange_buf,0,sizeof(exchange_buf));
  31.             strncpy(exchange_buf,config_linebuf,strlen(config_linebuf)-1);
  32.             memset(config_linebuf,0,sizeof(config_linebuf));
  33.             strcpy(config_linebuf,exchange_buf);
  34.         }
  35.         memset(line_name,0,sizeof(line_name));
  36.         leave_line = strstr(config_linebuf,config_sign);
  37.         if(leave_line == NULL)                            //去除无"="的情况
  38.         {
  39.             continue;
  40.         }
  41.         int leave_num = leave_line - config_linebuf;
  42.         strncpy(line_name,config_linebuf,leave_num);
  43.         if(strcmp(line_name,conf_name) ==0)
  44.         {
  45.             strncpy(config_buff,config_linebuf+(leave_num+1),strlen(config_linebuf)-leave_num-1);
                break;
  46.         }
  47.         if(fgetc(f)==EOF)
  48.         {
  49.             break;  
  50.         }
  51.         fseek(f,-1,SEEK_CUR);
  52.         memset(config_linebuf,0,sizeof(config_linebuf));
  53.     }
  54.     fclose(f);
  55. }
  58. /*
  59.  *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）
  60.  *
  61.  *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
  62.  *
  63.  */
  64. AddOrAltConfig(char *conf_path,char *conf_name,char *config_buff)
  65. {
  66.     
  67.     char config_linebuf[256];
  68.     char line_name[40];
  69.     char *config_sign = "=";
  70.     char *leave_line;
  71.     int  alter_sign = 0;
  72.     
  73.     FILE *f;
  74.     f = fopen(conf_path,"r+");
  75.     if(f == NULL)
  76.     {
  77.         printf("OPEN CONFIG FALID\n");
  78.         return 0;
  79.     }
  80.     fseek(f,0,SEEK_END);
  81.     long congig_lenth = ftell(f);
  82.     int configbuf_lenth = strlen(config_buff);
  83.     configbuf_lenth = configbuf_lenth + 5;
  84.     char sum_buf[congig_lenth+configbuf_lenth];
  85.     memset(sum_buf,0,sizeof(sum_buf));
  86.     fseek(f,0,SEEK_SET); 
  87.     while(fgets(config_linebuf,256,f) != NULL)
  88.     {   
  89.         if(strlen(config_linebuf) < 3) //判断是否是空行
  90.         {
  91.             strcat(sum_buf,config_linebuf);
  92.             continue;
  93.         }
  94.         leave_line = NULL;
  95.         leave_line = strstr(config_linebuf,config_sign);
  96.         if(leave_line == NULL)                            //去除无"="的情况
  97.         {
  98.             strcat(sum_buf,config_linebuf);
  99.             continue;
  100.         }
  101.         int leave_num = leave_line - config_linebuf;
  102.         memset(line_name,0,sizeof(line_name));
  103.         strncpy(line_name,config_linebuf,leave_num);
  104.         if(strcmp(line_name,conf_name) ==0)
  105.         {
  106.             strcat(sum_buf,config_buff);
  107.             strcat(sum_buf,"\n");
  108.             alter_sign = 1;
  109.         }
  110.         else
  111.         {
  112.             strcat(sum_buf,config_linebuf);
  113.         }
  114.         if(fgetc(f)==EOF)
  115.         {
  116.             break;  
  117.         }
  118.         fseek(f,-1,SEEK_CUR);
  119.         memset(config_linebuf,0,sizeof(config_linebuf));
  120.     }
  121.     if(alter_sign == 0)
  122.     {
  123.         strcat(sum_buf,config_buff);
  124.         strcat(sum_buf,"\n");
  125.     }
  126.     printf("---sum_buf---->%s<----------\n",sum_buf);
  127.     remove(conf_path);
  128.     fclose(f);
  129.     FILE *fp;
  130.     fp = fopen(conf_path,"w+");
  131.     if(fp == NULL)
  132.     {
  133.         printf("OPEN CONFIG FALID\n");
  134.         return 2;
  135.     }
  136.     fseek(fp,0,SEEK_SET);
  137.     fputs(sum_buf,fp);
  138.     fclose(fp);
  139. }
  143. /*
  144.  *删除配置文件内容（
  145.  *
  146.  *输入参数：1，配置文件路径 2，匹配标记 
  147.  *
  148.  */
  149. DeleteConfig(char *conf_path,char *conf_name)
  150. {
  151.     
  152.     char config_linebuf[256];
  153.     char line_name[40];
  154.     char *config_sign = "=";
  155.     char *leave_line;
  156.     
  157.     FILE *f;
  158.     f = fopen(conf_path,"r+");
  159.     if(f == NULL)
  160.     {
  161.         printf("OPEN CONFIG FALID\n");
  162.         return 0;
  163.     }
  164.     fseek(f,0,SEEK_END);
  165.     long congig_lenth = ftell(f);
  166.     char sum_buf[congig_lenth+2];
  167.     memset(sum_buf,0,sizeof(sum_buf));
  168.     fseek(f,0,SEEK_SET); 
  169.     while(fgets(config_linebuf,256,f) != NULL)
  170.     {   
  171.         if(strlen(config_linebuf) < 3) //判断是否是空行
  172.         {
  173.             strcat(sum_buf,config_linebuf);
  174.             continue;
  175.         }
  176.         leave_line = NULL;
  177.         leave_line = strstr(config_linebuf,config_sign);
  178.         if(leave_line == NULL)                            //去除无"="的情况
  179.         {
  180.             strcat(sum_buf,config_linebuf);
  181.             continue;
  182.         }
  183.         int leave_num = leave_line - config_linebuf;
  184.         memset(line_name,0,sizeof(line_name));
  185.         strncpy(line_name,config_linebuf,leave_num);
  186.         if(strcmp(line_name,conf_name) ==0)
  187.         {
  188.             
  189.         }
  190.         else
  191.         {
  192.             strcat(sum_buf,config_linebuf);
  193.         }
  194.         
  195.         if(fgetc(f)==EOF)
  196.         {
  197.             break;  
  198.         }
  199.         fseek(f,-1,SEEK_CUR);
  200.         memset(config_linebuf,0,sizeof(config_linebuf));
  201.     }
  202.     printf("---sum_buf---->%s<----------\n",sum_buf);
  203.     remove(conf_path);
  204.     fclose(f);
  205.     FILE *fp;
  206.     fp = fopen(conf_path,"w+");
  207.     if(fp == NULL)
  208.     {
  209.         printf("OPEN CONFIG FALID\n");
  210.         return 2;
  211.     }
  212.     fseek(fp,0,SEEK_SET);
  213.     fputs(sum_buf,fp);
  214.     fclose(fp);
  215. }

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