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Added printf to Print class to have Serial.printf() functionality #458

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Added printf to Print class to have Serial.printf() functionality #458

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10 changes: 10 additions & 0 deletions cores/arduino/Print.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,16 @@ size_t Print::println(const Printable& x)
return n;
}

void Print::printf(const char format[], ...)
{
char buf[PRINTF_BUF];
va_list ap;
va_start(ap, format);
vsnprintf(buf, sizeof(buf), format, ap);
write(buf);
va_end(ap);
}

// Private Methods /////////////////////////////////////////////////////////////

size_t Print::printNumber(unsigned long n, uint8_t base)
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4 changes: 4 additions & 0 deletions cores/arduino/Print.h
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Expand Up @@ -21,6 +21,8 @@

#include <inttypes.h>
#include <stdio.h> // for size_t
#include <stdarg.h> // for printf
#define PRINTF_BUF 80

#include "WString.h"
#include "Printable.h"
Expand Down Expand Up @@ -86,6 +88,8 @@ class Print
size_t println(const Printable&);
size_t println(void);

void printf(const char[], ...);

virtual void flush() { /* Empty implementation for backward compatibility */ }
};

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