Adding write(str) and write(buf, size) methods to Print class and Ethernet library Client and Server classes. This allows sending a whole string or buffer at once, reducing the number of ethernet packets.

cores/arduino/HardwareSerial.h

@@ -50,6 +50,7 @@ class HardwareSerial : public Print
     int read(void);
     void flush(void);
     virtual void write(uint8_t);
+    using Print::write; // pull in write(str) and write(buf, size) from Print
 };
 
 extern HardwareSerial Serial;

cores/arduino/Print.cpp

@@ -21,7 +21,6 @@
 
 #include <stdio.h>
 #include <string.h>
-#include <inttypes.h>
 #include <math.h>
 #include "wiring.h"
 
@@ -29,6 +28,20 @@
 
 // Public Methods //////////////////////////////////////////////////////////////
 
+/* default implementation: may be overridden */
+void Print::write(const char *str)
+{
+  while (*str)
+    write(*str++);
+}
+
+/* default implementation: may be overridden */
+void Print::write(const uint8_t *buffer, size_t size)
+{
+  while (size--)
+    write(*buffer++);
+}
+
 void Print::print(uint8_t b)
 {
   this->write(b);
@@ -39,10 +52,9 @@ void Print::print(char c)
   print((byte) c);
 }
 
-void Print::print(const char c[])
+void Print::print(const char str[])
 {
-  while (*c)
-    print(*c++);
+  write(str);
 }
 
 void Print::print(int n)

cores/arduino/Print.h

@@ -21,6 +21,7 @@
 #define Print_h
 
 #include <inttypes.h>
+#include <stdio.h> // for size_t
 
 #define DEC 10
 #define HEX 16
@@ -34,7 +35,9 @@ class Print
     void printNumber(unsigned long, uint8_t);
     void printFloat(double, uint8_t);
   public:
-    virtual void write(uint8_t);
+    virtual void write(uint8_t) = 0;
+    virtual void write(const char *str);
+    virtual void write(const uint8_t *buffer, size_t size);
     void print(char);
     void print(const char[]);
     void print(uint8_t);

libraries/Ethernet/Client.cpp

@@ -2,6 +2,7 @@ extern "C" {
   #include "types.h"
   #include "w5100.h"
   #include "socket.h"
+  #include "string.h"
 }
 
 #include "Ethernet.h"
@@ -50,6 +51,14 @@ void Client::write(uint8_t b) {
   send(_sock, &b, 1);
 }
 
+void Client::write(const char *str) {
+  send(_sock, (const uint8_t *)str, strlen(str));
+}
+
+void Client::write(const uint8_t *buf, size_t size) {
+  send(_sock, buf, size);
+}
+
 int Client::available() {
   return getSn_RX_RSR(_sock);
 }

libraries/Ethernet/Client.h

@@ -15,6 +15,8 @@ public:
   uint8_t status();
   uint8_t connect();
   virtual void write(uint8_t);
+  virtual void write(const char *str);
+  virtual void write(const uint8_t *buf, size_t size);
   int available();
   int read();
   void flush();

libraries/Ethernet/Server.cpp

@@ -2,6 +2,7 @@ extern "C" {
   #include "types.h"
   #include "w5100.h"
   #include "socket.h"
+  #include "string.h"
 }
 
 #include "Ethernet.h"
@@ -66,6 +67,16 @@ Client Server::available()
 }
 
 void Server::write(uint8_t b) 
+{
+  write(&b, 1);
+}
+
+void Server::write(const char *str) 
+{
+  write((const uint8_t *)str, strlen(str));
+}
+
+void Server::write(const uint8_t *buffer, size_t size) 
 {
   accept();
   
@@ -74,7 +85,7 @@ void Server::write(uint8_t b)
     
     if (EthernetClass::_server_port[sock] == _port &&
         client.status() == SOCK_ESTABLISHED) {
-      client.write(b);
+      client.write(buffer, size);
     }
   }
-}
+}

libraries/Ethernet/Server.h

@@ -18,6 +18,8 @@ public:
   Client available();
   void begin();
   virtual void write(uint8_t);
+  virtual void write(const char *str);
+  virtual void write(const uint8_t *buf, size_t size);
 };
 
 #endif