From 5cf2b9c3a2ac321cc994d0810fb17740a2fe999e Mon Sep 17 00:00:00 2001
From: "bernard.xiong@gmail.com" <bernard.xiong@gmail.com>
Date: Thu, 14 Jun 2012 15:47:27 +0000
Subject: [PATCH] Fixed buffer size issue.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2166 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 examples/network/tcpclient.c | 8 +++++---
 examples/network/udpserver.c | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/examples/network/tcpclient.c b/examples/network/tcpclient.c
index cc15b1178b..9927847f74 100644
--- a/examples/network/tcpclient.c
+++ b/examples/network/tcpclient.c
@@ -2,6 +2,8 @@
 #include <lwip/netdb.h> /* 为了解析主机名，需要包含netdb.h头文件 */
 #include <lwip/sockets.h> /* 使用BSD socket，需要包含sockets.h头文件 */
 
+#define BUFSZ	1024
+
 static const char send_data[] = "This is TCP Client from RT-Thread."; /* 发送用到的数据 */
 void tcpclient(const char* url, int port)
 {
@@ -14,7 +16,7 @@ void tcpclient(const char* url, int port)
    host = gethostbyname(url);
 
    /* 分配用于存放接收数据的缓冲 */
-   recv_data = rt_malloc(1024);
+   recv_data = rt_malloc(BUFSZ);
    if (recv_data == RT_NULL)
    {
        rt_kprintf("No memory\n");
@@ -51,8 +53,8 @@ void tcpclient(const char* url, int port)
 
    while(1)
    {
-       /* 从sock连接中接收最大1024字节数据 */
-       bytes_received = recv(sock, recv_data, 1024, 0);
+       /* 从sock连接中接收最大BUFSZ - 1字节数据 */
+       bytes_received = recv(sock, recv_data, BUFSZ - 1, 0);
        if (bytes_received <= 0)
        {
            /* 接收失败，关闭这个连接 */
diff --git a/examples/network/udpserver.c b/examples/network/udpserver.c
index d480ff3d14..ee84e9d061 100644
--- a/examples/network/udpserver.c
+++ b/examples/network/udpserver.c
@@ -1,6 +1,8 @@
 #include <rtthread.h>
 #include <lwip/sockets.h> /* 使用BSD socket，需要包含sockets.h头文件 */
 
+#define BUFSZ	1024
+
 void udpserv(void* paramemter)
 {
    int sock;
@@ -10,7 +12,7 @@ void udpserv(void* paramemter)
    struct sockaddr_in server_addr, client_addr;
 
    /* 分配接收用的数据缓冲 */
-   recv_data = rt_malloc(1024);
+   recv_data = rt_malloc(BUFSZ);
    if (recv_data == RT_NULL)
    {
        /* 分配内存失败，返回 */
@@ -51,8 +53,8 @@ void udpserv(void* paramemter)
 
    while (1)
    {
-       /* 从sock中收取最大1024字节数据 */
-       bytes_read = recvfrom(sock, recv_data, 1024, 0,
+       /* 从sock中收取最大BUFSZ - 1字节数据 */
+       bytes_read = recvfrom(sock, recv_data, BUFSZ - 1, 0,
                              (struct sockaddr *)&client_addr, &addr_len);
        /* UDP不同于TCP，它基本不会出现收取的数据失败的情况，除非设置了超时等待 */