2 Print.cpp - Base class that provides print() and println()
3 Copyright (c) 2008 David A. Mellis. All right reserved.
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 Modified 23 November 2006 by David A. Mellis
30 // Public Methods //////////////////////////////////////////////////////////////
32 /* default implementation: may be overridden */
33 size_t Print::write(const uint8_t *buffer, size_t size)
37 n += write(*buffer++);
42 size_t Print::print(const __FlashStringHelper *ifsh)
44 const char PROGMEM *p = (const char PROGMEM *)ifsh;
47 unsigned char c = pgm_read_byte(p++);
54 size_t Print::print(const String &s)
57 for (uint16_t i = 0; i < s.length(); i++) {
63 size_t Print::print(const char str[])
68 size_t Print::print(char c)
73 size_t Print::print(unsigned char b, int base)
75 return print((unsigned long) b, base);
78 size_t Print::print(int n, int base)
80 return print((long) n, base);
83 size_t Print::print(unsigned int n, int base)
85 return print((unsigned long) n, base);
88 size_t Print::print(long n, int base)
92 } else if (base == 10) {
96 return printNumber(n, 10) + t;
98 return printNumber(n, 10);
100 return printNumber(n, base);
104 size_t Print::print(unsigned long n, int base)
106 if (base == 0) return write(n);
107 else return printNumber(n, base);
110 size_t Print::print(double n, int digits)
112 return printFloat(n, digits);
115 size_t Print::println(const __FlashStringHelper *ifsh)
117 size_t n = print(ifsh);
122 size_t Print::print(const Printable& x)
124 return x.printTo(*this);
127 size_t Print::println(void)
129 size_t n = print('\r');
134 size_t Print::println(const String &s)
141 size_t Print::println(const char c[])
148 size_t Print::println(char c)
155 size_t Print::println(unsigned char b, int base)
157 size_t n = print(b, base);
162 size_t Print::println(int num, int base)
164 size_t n = print(num, base);
169 size_t Print::println(unsigned int num, int base)
171 size_t n = print(num, base);
176 size_t Print::println(long num, int base)
178 size_t n = print(num, base);
183 size_t Print::println(unsigned long num, int base)
185 size_t n = print(num, base);
190 size_t Print::println(double num, int digits)
192 size_t n = print(num, digits);
197 size_t Print::println(const Printable& x)
204 // Private Methods /////////////////////////////////////////////////////////////
206 size_t Print::printNumber(unsigned long n, uint8_t base) {
207 char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
208 char *str = &buf[sizeof(buf) - 1];
212 // prevent crash if called with base == 1
213 if (base < 2) base = 10;
218 char c = m - base * n;
219 *--str = c < 10 ? c + '0' : c + 'A' - 10;
225 size_t Print::printFloat(double number, uint8_t digits)
229 // Handle negative numbers
236 // Round correctly so that print(1.999, 2) prints as "2.00"
237 double rounding = 0.5;
238 for (uint8_t i=0; i<digits; ++i)
243 // Extract the integer part of the number and print it
244 unsigned long int_part = (unsigned long)number;
245 double remainder = number - (double)int_part;
246 n += print(int_part);
248 // Print the decimal point, but only if there are digits beyond
253 // Extract digits from the remainder one at a time
257 int toPrint = int(remainder);
259 remainder -= toPrint;