sanguino/cores/arduino/Print.cpp

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1 /*
2 Print.cpp - Base class that provides print() and println()
3 Copyright (c) 2008 David A. Mellis. All right reserved.
4
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.
9
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.
14
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
18
19 Modified 23 November 2006 by David A. Mellis
20 */
21
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <string.h>
25 #include <math.h>
26 #include "Arduino.h"
27
28 #include "Print.h"
29
30 // Public Methods //////////////////////////////////////////////////////////////
31
32 /* default implementation: may be overridden */
33 size_t Print::write(const uint8_t *buffer, size_t size)
34 {
35 size_t n = 0;
36 while (size--) {
37 n += write(*buffer++);
38 }
39 return n;
40 }
41
42 size_t Print::print(const __FlashStringHelper *ifsh)
43 {
44 const char PROGMEM *p = (const char PROGMEM *)ifsh;
45 size_t n = 0;
46 while (1) {
47 unsigned char c = pgm_read_byte(p++);
48 if (c == 0) break;
49 n += write(c);
50 }
51 return n;
52 }
53
54 size_t Print::print(const String &s)
55 {
56 size_t n = 0;
57 for (uint16_t i = 0; i < s.length(); i++) {
58 n += write(s[i]);
59 }
60 return n;
61 }
62
63 size_t Print::print(const char str[])
64 {
65 return write(str);
66 }
67
68 size_t Print::print(char c)
69 {
70 return write(c);
71 }
72
73 size_t Print::print(unsigned char b, int base)
74 {
75 return print((unsigned long) b, base);
76 }
77
78 size_t Print::print(int n, int base)
79 {
80 return print((long) n, base);
81 }
82
83 size_t Print::print(unsigned int n, int base)
84 {
85 return print((unsigned long) n, base);
86 }
87
88 size_t Print::print(long n, int base)
89 {
90 if (base == 0) {
91 return write(n);
92 } else if (base == 10) {
93 if (n < 0) {
94 int t = print('-');
95 n = -n;
96 return printNumber(n, 10) + t;
97 }
98 return printNumber(n, 10);
99 } else {
100 return printNumber(n, base);
101 }
102 }
103
104 size_t Print::print(unsigned long n, int base)
105 {
106 if (base == 0) return write(n);
107 else return printNumber(n, base);
108 }
109
110 size_t Print::print(double n, int digits)
111 {
112 return printFloat(n, digits);
113 }
114
115 size_t Print::println(const __FlashStringHelper *ifsh)
116 {
117 size_t n = print(ifsh);
118 n += println();
119 return n;
120 }
121
122 size_t Print::print(const Printable& x)
123 {
124 return x.printTo(*this);
125 }
126
127 size_t Print::println(void)
128 {
129 size_t n = print('\r');
130 n += print('\n');
131 return n;
132 }
133
134 size_t Print::println(const String &s)
135 {
136 size_t n = print(s);
137 n += println();
138 return n;
139 }
140
141 size_t Print::println(const char c[])
142 {
143 size_t n = print(c);
144 n += println();
145 return n;
146 }
147
148 size_t Print::println(char c)
149 {
150 size_t n = print(c);
151 n += println();
152 return n;
153 }
154
155 size_t Print::println(unsigned char b, int base)
156 {
157 size_t n = print(b, base);
158 n += println();
159 return n;
160 }
161
162 size_t Print::println(int num, int base)
163 {
164 size_t n = print(num, base);
165 n += println();
166 return n;
167 }
168
169 size_t Print::println(unsigned int num, int base)
170 {
171 size_t n = print(num, base);
172 n += println();
173 return n;
174 }
175
176 size_t Print::println(long num, int base)
177 {
178 size_t n = print(num, base);
179 n += println();
180 return n;
181 }
182
183 size_t Print::println(unsigned long num, int base)
184 {
185 size_t n = print(num, base);
186 n += println();
187 return n;
188 }
189
190 size_t Print::println(double num, int digits)
191 {
192 size_t n = print(num, digits);
193 n += println();
194 return n;
195 }
196
197 size_t Print::println(const Printable& x)
198 {
199 size_t n = print(x);
200 n += println();
201 return n;
202 }
203
204 // Private Methods /////////////////////////////////////////////////////////////
205
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];
209
210 *str = '\0';
211
212 // prevent crash if called with base == 1
213 if (base < 2) base = 10;
214
215 do {
216 unsigned long m = n;
217 n /= base;
218 char c = m - base * n;
219 *--str = c < 10 ? c + '0' : c + 'A' - 10;
220 } while(n);
221
222 return write(str);
223 }
224
225 size_t Print::printFloat(double number, uint8_t digits)
226 {
227 size_t n = 0;
228
229 // Handle negative numbers
230 if (number < 0.0)
231 {
232 n += print('-');
233 number = -number;
234 }
235
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)
239 rounding /= 10.0;
240
241 number += rounding;
242
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);
247
248 // Print the decimal point, but only if there are digits beyond
249 if (digits > 0) {
250 n += print(".");
251 }
252
253 // Extract digits from the remainder one at a time
254 while (digits-- > 0)
255 {
256 remainder *= 10.0;
257 int toPrint = int(remainder);
258 n += print(toPrint);
259 remainder -= toPrint;
260 }
261
262 return n;
263 }

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