Linux下的文件读写

if 1	// save language set.

static int get_file_line(char *pInputName, char *pOutputBuf, int line_idx)
{
	FILE * fp;
	int i=0;
	char * line = NULL;
	size_t len = 0;
	ssize_t read;

	if((i = access (pInputName,F_OK)) == 0)
	{
		//printf("[access] file exist!/n");	 
		fp = fopen(pInputName, "r");
	}
	else
	{
		//printf("[access] file not exist!!/n");
		fp = fopen(pInputName, "w+");
	}


	
	if (fp == NULL)
	 return -1;

	if(pOutputBuf && (line_idx<=0))
	{
		fclose(fp);
		return -2;
	}

	char *p;
	
	while ((read = getline(&line, &len, fp)) != -1) {

		//printf("line ==== %s \n",line);
		p=line;
		
		if(line[0]=='#')
			continue;
		++i;

		
	//	JPRINTF(("line [%d] === [%x] [%x] == [%x] \n",i,line[0],line[1],line[2],strlen(line)));
		
		if(pOutputBuf && (i>=line_idx))
			break;
	}

	if(pOutputBuf && (i!=line_idx))
	{
		//printf("pOutputBuf,i,line_idx === [%d, %d, %d] \n",pOutputBuf,i,line_idx);
		free(line);
		fclose(fp);
		return -3; 
	}

	if (pOutputBuf && line)
	{
		int length=strlen(line)>200?200:strlen(line);
		memcpy(pOutputBuf,line,length);
		free(line);
		fclose(fp);
		return 0; 
	}

	fclose(fp);
	return i;
}


#define LANG_CONFIG_NAME "/root/langconfig.txt"

static void TestGetLanguageConfig()
{
	int ret;
	char pTempString[40]={0};
	ret=get_file_line(LANG_CONFIG_NAME,pTempString,1);
	if(0!=ret)	// Get line Failed.
	{
		tSetupLangSelect=0;
	}else
		tSetupLangSelect=atoi(pTempString);

//	printf("tSetupLangSelect ======= [%d] [%d] [%s]\n",tSetupLangSelect,atoi(pTempString),pTempString);
}

static void TestSetLanguageConfig()
{
	int fd;
	char pTempParam[4]={0};
	sprintf(pTempParam,"%d",tSetupLangSelect);
	
	fd = open( LANG_CONFIG_NAME,O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU );
	write(fd, pTempParam, strlen(pTempParam));
	fsync(fd);
	close(fd);
}