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    有用的代码小片段4-C实现修改配置文件

    C/C++ admin 3257浏览 0评论

    如果配置文件时这样的：
    #this is a simple configure file
    myname=yuqiang
    age=23
    ..
    ..
    ..

    那面下面两个函数应该操作的不错：

    ?View Code C

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/*
*   getConf: get a config value from a configfile.
*
*   args:
*       confname:   config name
*       value:      the value of config name
*
*   return:
*       0:  success
*       -1: failed
*
*/
int getConf(const char *configfile, const char *confname, char *value)
{
    int i;
    char line[128]={0};
    char conbuff[128]={0};
    int math=0;
    FILE *f=fopen(configfile,"r");
    if(f==NULL) {
        show_debug_info( 1,"[error] open config file %s",configfile);
        return -1;
    }
    while( fgets(line,sizeof(line),f) ) {
        if( *line=='#' || *line=='n' ) {
            memset(line,0,sizeof(line));
            continue;
        }
        memset(conbuff,0,sizeof(conbuff));
        i=0;
        while( line[i]!='=' && i<strlen(line)-1 ) {
            conbuff[i]=line[i];
            i++;
        }
        if( i==strlen(line) ) {
            memset(line,0,sizeof(line));
            continue;
        }
        if( strcmp(conbuff,confname) ) {
            memset(line,0,sizeof(line));
            continue;
        } else {
            if( strlen(confname)+2==strlen(line) )
                return -1;
            math=1;
            memset(value,0,strlen(value));
            memcpy(value,line+strlen(confname)+1,strlen(line)-strlen(confname)-2);//还有一个'n'
            //printf("|%s|=|%s|n",confname,value);
            break;
        }
        memset(line,0,sizeof(line));
    }
    fclose(f);
 
    if(math)
        return 0;
    else
        return -1;
}
 
/*
*   setConf: set a config value to a configfile.
*
*   args:
*       confname:   config name
*       value:      the value of config name
*
*   return :
*       0:  success
*       1:  add a new config
*       -1: failed
*
*/
int setConf(const char *configfile, const char *confname, const char *value)
{
    char conbuff[128]={0};
    int i;
    char line[128]={0};
    int math=0;
    FILE *f=fopen(configfile,"r");
    if(f==NULL) {
        FILE *newf=fopen(configfile,"a");
        if(newf==NULL) {
            show_debug_info( 1,"[error] open config file %s",configfile);
            return -1;
        }
        sprintf(conbuff,"%s=%sn",confname,value);
        fputs(conbuff,newf);
        fclose(newf);
        return 1;
    }
    /* open a tmp file to save config */
    FILE *tmp=tmpfile();
    if(tmp==NULL) {
        return -1;
    }
 
    /*parse config file and save to tmp file*/
    while( fgets(line,sizeof(line),f) ) {
        memset(conbuff,0,sizeof(conbuff));
        if( *line=='#' || *line=='n' ) {
            fputs(line,tmp);
            memset(line,0,sizeof(line));
            continue;
        }
        i=0;
        while( line[i]!='=' && i<strlen(line) ) {
            conbuff[i]=line[i];
            i++;
        }
        if( strcmp(conbuff,confname) ) {
            fputs(line,tmp);
        }
        else {
            math=1;
            memset(conbuff,0,sizeof(conbuff));
            sprintf(conbuff,"%s=%sn",confname,value);
            fputs(conbuff,tmp);
        }
        memset(line,0,sizeof(line));
    }
    if(math==0) {
        memset(conbuff,0,sizeof(conbuff));
        sprintf(conbuff,"%s=%sn",confname,value);
        fputs(conbuff,tmp);
    }
    fclose(f);
 
    fflush(tmp);
    rewind(tmp);
 
    /*copy tmp file's data to config file*/
    f=fopen(configfile,"w+");
    if(f==NULL) {
        show_debug_info( 1,"[error] open config file %s",configfile);
        return -1;
    }
 
    memset(line,0,sizeof(line));
    while( fgets(line,sizeof(line),tmp) ) {
        fputs(line,f);
        memset(line,0,sizeof(line));
    }
 
    fclose(tmp);
    fclose(f);
    if(math)
        return 0;
    else
        return 1;
}

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