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cd56dc0901
* restore dtostrf+fix when float printing is disabled at link time * fix include file * fix with proposal per review * always use dtostrf
121 lines
3.1 KiB
C++
121 lines
3.1 KiB
C++
/*
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core_esp8266_noniso.c - nonstandard (but usefull) conversion functions
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 03 April 2015 by Markus Sattler
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <math.h>
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#include <limits>
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#include "stdlib_noniso.h"
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extern "C" {
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char* ltoa(long value, char* result, int base) {
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return itoa((int)value, result, base);
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}
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char* ultoa(unsigned long value, char* result, int base) {
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return utoa((unsigned int)value, result, base);
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}
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char * dtostrf(double number, signed char width, unsigned char prec, char *s) {
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bool negative = false;
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if (isnan(number)) {
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strcpy(s, "nan");
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return s;
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}
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if (isinf(number)) {
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strcpy(s, "inf");
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return s;
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}
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char* out = s;
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int fillme = width; // how many cells to fill for the integer part
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if (prec > 0) {
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fillme -= (prec+1);
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}
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// Handle negative numbers
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if (number < 0.0) {
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negative = true;
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fillme--;
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number = -number;
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}
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// Round correctly so that print(1.999, 2) prints as "2.00"
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// I optimized out most of the divisions
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double rounding = 2.0;
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for (uint8_t i = 0; i < prec; ++i)
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rounding *= 10.0;
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rounding = 1.0 / rounding;
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number += rounding;
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// Figure out how big our number really is
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double tenpow = 1.0;
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int digitcount = 1;
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double nextpow;
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while (number >= (nextpow = (10.0 * tenpow))) {
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tenpow = nextpow;
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digitcount++;
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}
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// minimal compensation for possible lack of precision (#7087 addition)
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number *= 1 + std::numeric_limits<decltype(number)>::epsilon();
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number /= tenpow;
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fillme -= digitcount;
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// Pad unused cells with spaces
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while (fillme-- > 0) {
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*out++ = ' ';
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}
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// Handle negative sign
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if (negative) *out++ = '-';
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// Print the digits, and if necessary, the decimal point
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digitcount += prec;
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int8_t digit = 0;
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while (digitcount-- > 0) {
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digit = (int8_t)number;
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if (digit > 9) digit = 9; // insurance
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*out++ = (char)('0' | digit);
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if ((digitcount == prec) && (prec > 0)) {
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*out++ = '.';
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}
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number -= digit;
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number *= 10.0;
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}
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// make sure the string is terminated
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*out = 0;
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return s;
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}
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};
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