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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 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;
- }
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