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.

hardware/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;

hardware/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)

hardware/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);