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TinyPrint.h
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TinyPrint.h
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/***************************************************************************
This is a slimmed down version of the original Print.h Arduino library.
The intent is to have a smaller prog mem a ram footprint. To achieve this
String and Printable were removed, along with the error methods. Also the
different parts (flashstring, number, float, print lines) can be
enabled/disabled individually with conditional compilation.
The implementation needed to go here instead of a .cpp file, because that
way the configuration #defines would not work!
See: https://github.com/arduino/Arduino/pull/1808#issuecomment-370210551
Written by https://github.com/notisrac, 2018
MIT license, all text above must be included in any redistribution
***************************************************************************/
/*
Originals:
https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/Print.cpp
https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/Print.h
*/
#pragma once
#ifndef _TINYPRINT_H
#define _TINYPRINT_H
// default values
#ifndef TP_FLASHSTRINGHELPER
#define TP_FLASHSTRINGHELPER 0
#endif
#ifndef TP_NUMBERS
#define TP_NUMBERS 0
#endif
#ifndef TP_FLOAT
#define TP_FLOAT 0
#endif
#ifndef TP_PRINTLINES
#define TP_PRINTLINES 0
#endif
#ifndef TP_WINDOWSLINEENDS
#define TP_WINDOWSLINEENDS 0
#endif
// error check
#if TP_FLOAT && !TP_NUMBERS
#error "TP_NUMBERS must be set to 1, when using TP_FLOAT!"
#endif // TP_FLOAT && !TP_NUMBERS
#include <Arduino.h>
class TinyPrint
{
public:
TinyPrint()
{
}
virtual byte write(uint8_t) = 0;
byte write(const char *str) {
if (str == NULL) return 0;
return write((const uint8_t *)str, strlen(str));
}
byte write(const char *buffer, size_t size) {
return write((const uint8_t *)buffer, size);
}
/* default implementation: may be overridden */
virtual byte write(const uint8_t *buffer, size_t size)
{
size_t n = 0;
while (size--) {
if (write(*buffer++)) {
n++;
}
else {
break;
}
}
return n;
}
void print(const char str[])
{
write(str);
}
void print(char c)
{
write(c);
}
#if TP_PRINTLINES
void println(void)
{
#if TP_WINDOWSLINEENDS
write("\r\n"); // nope, this cannot be further optimized with the current setup
#else
write('\n');
#endif // TP_WINDOWSLINEENDS
}
void println(const char c[])
{
print(c);
println();
}
void println(char c)
{
print(c);
println();
}
#endif // TP_PRINTLINES
#if TP_FLASHSTRINGHELPER
void print(const __FlashStringHelper *ifsh)
{
PGM_P p = reinterpret_cast<PGM_P>(ifsh);
while (1) {
unsigned char c = pgm_read_byte(p++);
if (c == 0) {
break;
}
if (write(c)) {
// do nothing - the counter increment was here
}
else {
break;
}
}
}
#if TP_PRINTLINES
void println(const __FlashStringHelper *ifsh)
{
print(ifsh);
println();
}
#endif // TP_PRINTLINES
#endif // TP_FLASHSTRINGHELPER
#if TP_NUMBERS
void print(unsigned char b, int base)
{
print((unsigned long)b, base);
}
void print(int n, int base)
{
print((long)n, base);
}
void print(unsigned int n, int base)
{
print((unsigned long)n, base);
}
void print(long n, int base)
{
if (base == 0) {
write(n);
}
else if (base == 10) {
if (n < 0) {
print('-');
n = -n;
printNumber(n, 10);
}
return printNumber(n, 10);
}
else {
return printNumber(n, base);
}
}
void print(unsigned long n, int base)
{
if (base == 0) {
write(n);
}
else {
printNumber(n, base);
}
}
#if TP_PRINTLINES
void println(unsigned char b, int base)
{
print(b, base);
println();
}
void println(int num, int base)
{
print(num, base);
println();
}
void println(unsigned int num, int base)
{
print(num, base);
println();
}
void println(long num, int base)
{
print(num, base);
println();
}
void println(unsigned long num, int base)
{
print(num, base);
println();
}
#endif // TP_PRINTLINES
#endif // TP_NUMBERS
#if TP_FLOAT
void print(double n, int digits)
{
printFloat(n, digits);
}
#if TP_PRINTLINES
void println(double num, int digits)
{
print(num, digits);
println();
}
#endif // TP_PRINTLINES
#endif // TP_FLOAT
// Private Methods /////////////////////////////////////////////////////////////
private:
#if TP_NUMBERS
void 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);
write(str);
}
#endif // TP_NUMBERS
#if TP_FLOAT
void printFloat(double number, uint8_t digits)
{
if (isnan(number))
{
return print('N'/*F("nan")*/);
}
if (isinf(number))
{
return print('I'/*F("inf")*/);
}
if (number > 4294967040.0)
{
return print('O'/*F("ovf")*/); // constant determined empirically
}
if (number < -4294967040.0)
{
return print('O'/*F("ovf")*/); // constant determined empirically
}
// Handle negative numbers
if (number < 0.0)
{
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;
print(int_part);
// Print the decimal point, but only if there are digits beyond
if (digits > 0) {
print('.');
}
// Extract digits from the remainder one at a time
while (digits-- > 0)
{
remainder *= 10.0;
unsigned int toPrint = (unsigned int)(remainder);
print(toPrint);
remainder -= toPrint;
}
}
#endif // TP_FLOAT
};
#endif // _TINYPRINT_H