MySensors/drivers/Linux/Print.cpp

/*
 Print.cpp - Base class that provides print() and println()
 Copyright (c) 2008 David A. Mellis.  All right reserved.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 Modified 23 November 2006 by David A. Mellis
 Modified December 2014 by Ivan Grokhotkov
 Modified May 2015 by Michael C. Miller - esp8266 progmem support
 Modified August 2016 by Marcelo Aquino <marceloaqno@gmail.org> for MySensors use
 */

#include <cstdlib>
#include <cstdio>
#include <cstdarg>
#include <cmath>
#include "Print.h"

// Public Methods //////////////////////////////////////////////////////////////

size_t Print::write(const uint8_t *buffer, size_t size)
{
	size_t n = 0;
	while(size--) {
		n += write(*buffer++);
	}
	return n;
}

size_t
#ifdef __GNUC__
__attribute__((format(printf, 2, 3)))
#endif
Print::printf(const char *format, ...)
{
	va_list arg;
	va_start(arg, format);
	char temp[64];
	char* buffer = temp;
	size_t len = vsnprintf(temp, sizeof(temp), format, arg);
	va_end(arg);
	if (len > sizeof(temp) - 1) {
		buffer = new char[len + 1];
		if (!buffer) {
			return 0;
		}
		va_start(arg, format);
		vsnprintf(buffer, len + 1, format, arg);
		va_end(arg);
	}
	len = write((const uint8_t*) buffer, len);
	if (buffer != temp) {
		delete[] buffer;
	}
	return len;
}

size_t Print::print(const std::string &s)
{
	return write(s.c_str(), s.length());
}

size_t Print::print(const char str[])
{
	return write(str);
}

size_t Print::print(char c)
{
	return write(c);
}

size_t Print::print(unsigned char b, int base)
{
	return print((unsigned long) b, base);
}

size_t Print::print(int n, int base)
{
	return print((long) n, base);
}

size_t Print::print(unsigned int n, int base)
{
	return print((unsigned long) n, base);
}

size_t Print::print(long n, int base)
{
	if(base == 0) {
		return write(n);
	} else if(base == 10) {
		if(n < 0) {
			int t = print('-');
			n = -n;
			return printNumber(n, 10) + t;
		}
		return printNumber(n, 10);
	} else {
		return printNumber(n, base);
	}
}

size_t Print::print(unsigned long n, int base)
{
	if(base == 0) {
		return write(n);
	} else {
		return printNumber(n, base);
	}
}

size_t Print::print(double n, int digits)
{
	return printFloat(n, digits);
}

size_t Print::println(void)
{
	return print("\r\n");
}

size_t Print::println(const std::string &s)
{
	size_t n = print(s);
	n += println();
	return n;
}

size_t Print::println(const char c[])
{
	size_t n = print(c);
	n += println();
	return n;
}

size_t Print::println(char c)
{
	size_t n = print(c);
	n += println();
	return n;
}

size_t Print::println(unsigned char b, int base)
{
	size_t n = print(b, base);
	n += println();
	return n;
}

size_t Print::println(int num, int base)
{
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(unsigned int num, int base)
{
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(long num, int base)
{
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(unsigned long num, int base)
{
	size_t n = print(num, base);
	n += println();
	return n;
}

size_t Print::println(double num, int digits)
{
	size_t n = print(num, digits);
	n += println();
	return n;
}

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

size_t Print::printNumber(unsigned long n, uint8_t base)
{
	char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
	char *str = &buf[sizeof(buf) - 1];

	*str = '\0';

	// prevent crash if called with base == 1
	if(base < 2) {
		base = 10;
	}

	do {
		char c = n % base;
		n /= base;

		*--str = c < 10 ? c + '0' : c + 'A' - 10;
	} while(n);

	return write(str);
}

size_t Print::printFloat(double number, uint8_t digits)
{
	size_t n = 0;

	if(std::isnan(number)) {
		return print("nan");
	}
	if(std::isinf(number)) {
		return print("inf");
	}
	if(number > 4294967040.0) {
		return print("ovf");  // constant determined empirically
	}
	if(number < -4294967040.0) {
		return print("ovf");  // constant determined empirically
	}

	// Handle negative numbers
	if(number < 0.0) {
		n += print('-');
		number = -number;
	}

	// Round correctly so that print(1.999, 2) prints as "2.00"
	double rounding = 0.5;
	for(uint8_t i = 0; i < digits; ++i) {
		rounding /= 10.0;
	}

	number += rounding;

	// Extract the integer part of the number and print it
	unsigned long int_part = (unsigned long) number;
	double remainder = number - (double) int_part;
	n += print(int_part);

	// Print the decimal point, but only if there are digits beyond
	if(digits > 0) {
		n += print(".");
	}

	// Extract digits from the remainder one at a time
	while(digits-- > 0) {
		remainder *= 10.0;
		int toPrint = int(remainder);
		n += print(toPrint);
		remainder -= toPrint;
	}

	return n;
}