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Print.cpp
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381 lines (316 loc) · 7.49 KB
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/*
Copyright (c) 2014 Arduino. 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
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "Print.h"
using namespace arduino;
// Public Methods //////////////////////////////////////////////////////////////
/* default implementation: may be overridden */
size_t Print::write(const uint8_t *buffer, size_t size)
{
size_t n = 0;
while (size--) {
if (write(*buffer++)) n++;
else break;
}
return n;
}
size_t Print::print(const __FlashStringHelper *ifsh)
{
#if defined(__AVR__)
PGM_P p = reinterpret_cast<PGM_P>(ifsh);
size_t n = 0;
while (1) {
unsigned char c = pgm_read_byte(p++);
if (c == 0) break;
if (write(c)) n++;
else break;
}
return n;
#else
return print(reinterpret_cast<const char *>(ifsh));
#endif
}
size_t Print::print(const 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(long long n, int base)
{
if (base == 0) {
return write(n);
} else if (base == 10) {
if (n < 0) {
int t = print('-');
n = -n;
return printULLNumber(n, 10) + t;
}
return printULLNumber(n, 10);
} else {
return printULLNumber(n, base);
}
}
size_t Print::print(unsigned long long n, int base)
{
if (base == 0) return write(n);
else return printULLNumber(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)
{
return write("\r\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(long long num, int base)
{
size_t n = print(num, base);
n += println();
return n;
}
size_t Print::println(unsigned long 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 {
char c = n % base;
n /= base;
*--str = c < 10 ? c + '0' : c + 'A' - 10;
} while(n);
return write(str);
}
// REFERENCE IMPLEMENTATION FOR ULL
// size_t Print::printULLNumber(unsigned long long n, uint8_t base)
// {
// // if limited to base 10 and 16 the bufsize can be smaller
// char buf[65];
// char *str = &buf[64];
// *str = '\0';
// // prevent crash if called with base == 1
// if (base < 2) base = 10;
// do {
// unsigned long long t = n / base;
// char c = n - t * base; // faster than c = n%base;
// n = t;
// *--str = c < 10 ? c + '0' : c + 'A' - 10;
// } while(n);
// return write(str);
// }
// FAST IMPLEMENTATION FOR ULL
size_t Print::printULLNumber(unsigned long long n64, uint8_t base)
{
// if limited to base 10 and 16 the bufsize can be 20
char buf[64];
uint8_t i = 0;
uint8_t innerLoops = 0;
// prevent crash if called with base == 1
if (base < 2) base = 10;
// process chunks that fit in "16 bit math".
uint16_t top = 0xFFFF / base;
uint16_t th16 = 1;
while (th16 < top)
{
th16 *= base;
innerLoops++;
}
while (n64 > th16)
{
// 64 bit math part
uint64_t q = n64 / th16;
uint16_t r = n64 - q*th16;
n64 = q;
// 16 bit math loop to do remainder. (note buffer is filled reverse)
for (uint8_t j=0; j < innerLoops; j++)
{
uint16_t qq = r/base;
buf[i++] = r - qq*base;
r = qq;
}
}
uint16_t n16 = n64;
while (n16 > 0)
{
uint16_t qq = n16/base;
buf[i++] = n16 - qq*base;
n16 = qq;
}
size_t bytes = i;
for (; i > 0; i--)
write((char) (buf[i - 1] < 10 ?
'0' + buf[i - 1] :
'A' + buf[i - 1] - 10));
return bytes;
}
size_t Print::printFloat(double number, int digits)
{
if (digits < 0)
digits = 2;
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;
unsigned int toPrint = (unsigned int)remainder;
n += print(toPrint);
remainder -= toPrint;
}
return n;
}