Use const pointers for Stream find functions

teensy3/Stream.cpp

 }
 
  // find returns true if the target string is found
-bool  Stream::find(char *target)
+bool  Stream::find(const char *target)
 {
   return findUntil(target, NULL);
 }
 
 // reads data from the stream until the target string of given length is found
 // returns true if target string is found, false if timed out
-bool Stream::find(char *target, size_t length)
+bool Stream::find(const char *target, size_t length)
 {
   return findUntil(target, length, NULL, 0);
 }
 
 // as find but search ends if the terminator string is found
-bool  Stream::findUntil(char *target, char *terminator)
+bool  Stream::findUntil(const char *target, const char *terminator)
 {
   return findUntil(target, strlen(target), terminator, strlen(terminator));
 }
 // reads data from the stream until the target string of the given length is found
 // search terminated if the terminator string is found
 // returns true if target string is found, false if terminated or timed out
-bool Stream::findUntil(char *target, size_t targetLen, char *terminator, size_t termLen)
+bool Stream::findUntil(const char *target, size_t targetLen, const char *terminator, size_t termLen)
 {
   size_t index = 0;  // maximum target string length is 64k bytes!
   size_t termIndex = 0;

teensy3/Stream.h

 	virtual void flush() = 0;
 
 	void setTimeout(unsigned long timeout);
-	bool find(char *target);
-	bool find(uint8_t *target) { return find ((char *)target); }
-	bool find(char *target, size_t length);
-	bool find(uint8_t *target, size_t length) { return find ((char *)target, length); }
-	bool findUntil(char *target, char *terminator);
-	bool findUntil(uint8_t *target, char *terminator) { return findUntil((char *)target, terminator); }
-	bool findUntil(char *target, size_t targetLen, char *terminate, size_t termLen);
-	bool findUntil(uint8_t *target, size_t targetLen, char *terminate, size_t termLen) {return findUntil((char *)target, targetLen, terminate, termLen); }
+	bool find(const char *target);
+	bool find(const uint8_t *target) { return find ((const char *)target); }
+	bool find(const char *target, size_t length);
+	bool find(const uint8_t *target, size_t length) { return find ((const char *)target, length); }
+	bool findUntil(const char *target, const char *terminator);
+	bool findUntil(const uint8_t *target, const char *terminator) { return findUntil((const char *)target, terminator); }
+	bool findUntil(const char *target, size_t targetLen, const char *terminate, size_t termLen);
+	bool findUntil(const uint8_t *target, size_t targetLen, const char *terminate, size_t termLen) {return findUntil((const char *)target, targetLen, terminate, termLen); }
 	long parseInt();
 	long parseInt(char skipChar);
 	float parseFloat();
 	float parseFloat(char skipChar);
 	size_t readBytes(char *buffer, size_t length);
-	size_t readBytes( uint8_t *buffer, size_t length) { return readBytes((char *)buffer, length); }
+	size_t readBytes(uint8_t *buffer, size_t length) { return readBytes((char *)buffer, length); }
 	size_t readBytesUntil(char terminator, char *buffer, size_t length);
 	size_t readBytesUntil(char terminator, uint8_t *buffer, size_t length) { return readBytesUntil(terminator, (char *)buffer, length); }
 	String readString(size_t max = 120);