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

2016-04-25T02:10:55Z

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<pre style="color:blue">
/*
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
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "Arduino.h"

#include "Print.h"

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

/* default implementation: may be overridden */
size_t Print::write(const uint8_t *buffer, size_t size)
{
size_t n = 0;
while (size--) {
n += write(*buffer++);
}
return n;
}

size_t Print::print(const __FlashStringHelper *ifsh)
{
const char PROGMEM *p = (const char PROGMEM *)ifsh;
size_t n = 0;
while (1) {
unsigned char c = pgm_read_byte(p++);
if (c == 0) break;
n += write(c);
}
return n;
}

size_t Print::print(const String &s)
{
size_t n = 0;
for (uint16_t i = 0; i < s.length(); i++) {
n += write(s[i]);
}
return n;
}

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(const __FlashStringHelper *ifsh)
{
size_t n = print(ifsh);
n += println();
return n;
}

size_t Print::print(const Printable& x)
{
return x.printTo(*this);
}

size_t Print::println(void)
{
size_t n = print('\r');
n += print('\n');
return n;
}

size_t Print::println(const 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;
}

size_t Print::println(const Printable& x)
{
size_t n = print(x);
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 {
unsigned long m = n;
n /= base;
char c = m - base * n;
*--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 (isnan(number)) return print("nan");
if (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;
}

</pre>

Print.cpp - 版本历史

YWrobot WM：创建页面，内容为“
/* Print.cpp - Base class that provides print() and println() Copyright (c) 2008 David A. Mellis. All right reserved. This library is...”