added length-specified (in addition to null-terminated) serial put

wiringPi/wiringSerial.c

@@ -171,6 +171,17 @@ void serialPuts (const int fd, const char *s)
 }
 
 /*
+ * serialPut:
+ *	Send an n character buffer to the serial port
+ *********************************************************************************
+ */
+
+void serialPut (const int fd, const char *s, const int n)
+{
+  write (fd, s, n) ;
+}
+
+/*
  * serialPrintf:
  *	Printf over Serial
  *********************************************************************************

wiringPi/wiringSerial.h

@@ -29,6 +29,7 @@ extern void  serialClose     (const int fd) ;
 extern void  serialFlush     (const int fd) ;
 extern void  serialPutchar   (const int fd, const unsigned char c) ;
 extern void  serialPuts      (const int fd, const char *s) ;
+extern void  serialPut       (const int fd, const char *s, const int n) ;
 extern void  serialPrintf    (const int fd, const char *message, ...) ;
 extern int   serialDataAvail (const int fd) ;
 extern int   serialGetchar   (const int fd) ;