HTTP(socket)下载遇到valgrind提示的错误： Conditional jump or move depends on uninitialised value(s)

我写了个http下载函数，下载txt、jpg都正常，就是下载php有问题：valgrind会报错Conditional jump or move depends on uninitialised value(s)，

函数定义：

char* httpdown(char *domain, int port, char *uri, int *length) ；

调用：

strcpy(uri, "/net.php");

rtn = httpdown("192.168.1.24", 80, uri, &len);

printf("File saved\n%s\n", rtn);

大概发现printf这句会报那个错，如果uri是个txt或者jpg都不会报。

经过一番折腾后发现是memcpy的问题，改成strncpy就可以了，但那样如果是图片又不能正确处理，所以，就只好判断下返回数据类型了，具体代码：

char* httpdown(char *domain, int port, char *uri, int *length) {

	char buffer[RECEIVE_BUF + 1];

	//memset(buffer, '\0', RECEIVE_BUF + 1);

	char* rtn;

	rtn = malloc(DOWNLOAD_BUF);

	rtn[0] = 0;

	(*length) = 0;

	int sockfd = openRequest(domain, port, uri, rtn, buffer);

#ifdef DEBUG

	if (sockfd < 0){

		printf("Connect to %s:%d failed\n", domain, port);

		return rtn;

	}

#else

	if (sockfd < 0)

		return rtn;

#endif

#ifdef DEBUG

	printf("Init connect to %s:%d done, fd=%d\n", domain, port, sockfd);

#endif

	int len, needLen, dataLen=0;

	int current_buffer_size = DOWNLOAD_BUF;

	rtn[0] = 0;

	buffer[0] = 0;

	int type = -1;

	char * tmp;

	while (1) {

		len = recv(sockfd, buffer, RECEIVE_BUF, 0);

		if(type<0){//如果没有取得返回数据类型

			tmp = strstr(buffer, "Content-Type");//如果已经获得content-type——潜在bug如果content-type和他的值没有一起返回则会出问题，不管了

			if(tmp!=NULL){

				tmp = strstr(tmp, "text");

				if(tmp==NULL)

					type=1;

				else

					type=0;

			}

		}

		if (len > 0) {

			needLen = dataLen + len;

			while (current_buffer_size <= needLen) {

				current_buffer_size += DOWNLOAD_BUF;

#ifdef DEBUG

				printf("realloc to %d\n", current_buffer_size);

#endif

				rtn = realloc(rtn, current_buffer_size);

				rtn[dataLen] = 0;

			}

#ifdef DEBUG

			printf("http sockect received %d data\n", len);

#endif

			if(type<1)//字符串用strncat

				strncat(rtn+dataLen, buffer, len);

			else

				memcpy(rtn+dataLen, buffer, len);

			dataLen+=len;

		} else {

			if (len < 0) {

				if(errno>0)

				sprintf(rtn, "消息接收失败！错误代码是%d，错误信息是'%s'\n", errno,

						strerror(errno));

				return rtn;

			}

#ifdef DEBUG

		printf("Read data from %s:%d, complete\n", domain, port);

#endif

			break;

		}

	}

	close(sockfd);

	(*length) = dataLen;

	return rtn;

}

巴特西

HTTP(socket)下载遇到valgrind提示的错误： Conditional jump or move depends on uninitialised value(s)

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