Add Print::availableForWrite

If available() is in the base Stream class, then availableForWrite() should be in the base Print class

Author: eric-wieser

hardware/arduino/avr/cores/arduino/HardwareSerial.h

@@ -124,7 +124,7 @@ class HardwareSerial : public Stream
     virtual int available(void);
     virtual int peek(void);
     virtual int read(void);
-    int availableForWrite(void);
+    virtual int availableForWrite(void);
     virtual void flush(void);
     virtual size_t write(uint8_t);
     inline size_t write(unsigned long n) { return write((uint8_t)n); }

hardware/arduino/avr/cores/arduino/Print.h

@@ -22,6 +22,7 @@
 
 #include <inttypes.h>
 #include <stdio.h> // for size_t
+#include <limits.h> // for INT_MAX
 
 #include "WString.h"
 #include "Printable.h"
@@ -54,7 +55,9 @@ class Print
     size_t write(const char *buffer, size_t size) {
       return write((const uint8_t *)buffer, size);
     }
-    
+
+    virtual int availableForWrite() { return INT_MAX; }
+
     size_t print(const __FlashStringHelper *);
     size_t print(const String &);
     size_t print(const char[]);

hardware/arduino/avr/cores/arduino/USBAPI.h

@@ -98,7 +98,7 @@ class Serial_ : public Stream
 	virtual int available(void);
 	virtual int peek(void);
 	virtual int read(void);
-	int availableForWrite(void);
+	virtual int availableForWrite(void);
 	virtual void flush(void);
 	virtual size_t write(uint8_t);
 	virtual size_t write(const uint8_t*, size_t);

hardware/arduino/sam/cores/arduino/Print.h

@@ -22,6 +22,7 @@
 
 #include <inttypes.h>
 #include <stdio.h> // for size_t
+#include <limits.h> // for INT_MAX
 
 #include "WString.h"
 #include "Printable.h"
@@ -54,7 +55,9 @@ class Print
     size_t write(const char *buffer, size_t size) {
       return write((const uint8_t *)buffer, size);
     }
-    
+
+    virtual int availableForWrite() { return INT_MAX; }
+
     size_t print(const __FlashStringHelper *);
     size_t print(const String &);
     size_t print(const char[]);

hardware/arduino/sam/cores/arduino/UARTClass.h

@@ -48,7 +48,7 @@ class UARTClass : public HardwareSerial
     void begin(const uint32_t dwBaudRate, const UARTModes config);
     void end(void);
     int available(void);
-    int availableForWrite(void);
+    virtual int availableForWrite(void);
     int peek(void);
     int read(void);
     void flush(void);