head 1.2; access; symbols micropython-1-5-2-base:1.1.1.1 MICROPYTHON:1.1.1; locks; strict; comment @ * @; 1.2 date 2026.10.15.05.28.36; author agc; state dead; branches; next 1.1; commitid aHLdC1EGCUYk7xZG; 1.1 date 2016.01.14.01.38.50; author agc; state Exp; branches 1.1.1.1; next ; commitid Q8liT0v6zMF95QQy; 1.1.1.1 date 2016.01.14.01.38.50; author agc; state Exp; branches; next ; commitid Q8liT0v6zMF95QQy; desc @@ 1.2 log @Remove waaaay old micropython sources which haven't been relevant for 10 years @ text @/* * This file is part of the Micro Python project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2013, 2014 Damien P. George * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "py/mpconfig.h" #if MICROPY_FLOAT_IMPL != MICROPY_FLOAT_IMPL_NONE #include #include #include "py/formatfloat.h" /*********************************************************************** Routine for converting a arbitrary floating point number into a string. The code in this funcion was inspired from Fred Bayer's pdouble.c. Since pdouble.c was released as Public Domain, I'm releasing this code as public domain as well. The original code can be found in https://github.com/dhylands/format-float Dave Hylands ***********************************************************************/ #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT // 1 sign bit, 8 exponent bits, and 23 mantissa bits. // exponent values 0 and 255 are reserved, exponent can be 1 to 254. // exponent is stored with a bias of 127. // The min and max floats are on the order of 1x10^37 and 1x10^-37 #define FPTYPE float #define FPCONST(x) x##F #define FPROUND_TO_ONE 0.9999995F #define FPDECEXP 32 #define FLT_SIGN_MASK 0x80000000 #define FLT_EXP_MASK 0x7F800000 #define FLT_MAN_MASK 0x007FFFFF union floatbits { float f; uint32_t u; }; static inline int fp_signbit(float x) { union floatbits fb = {x}; return fb.u & FLT_SIGN_MASK; } static inline int fp_isspecial(float x) { union floatbits fb = {x}; return (fb.u & FLT_EXP_MASK) == FLT_EXP_MASK; } static inline int fp_isinf(float x) { union floatbits fb = {x}; return (fb.u & FLT_MAN_MASK) == 0; } static inline int fp_iszero(float x) { union floatbits fb = {x}; return fb.u == 0; } static inline int fp_isless1(float x) { union floatbits fb = {x}; return fb.u < 0x3f800000; } // Assumes both fp_isspecial() and fp_isinf() were applied before #define fp_isnan(x) 1 #elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE #define FPTYPE double #define FPCONST(x) x #define FPROUND_TO_ONE 0.999999999995 #define FPDECEXP 256 #include #define fp_signbit(x) signbit(x) #define fp_isspecial(x) 1 #define fp_isnan(x) isnan(x) #define fp_isinf(x) isinf(x) #define fp_iszero(x) (x == 0) #define fp_isless1(x) (x < 1.0) #endif static const FPTYPE g_pos_pow[] = { #if FPDECEXP > 32 1e256, 1e128, 1e64, #endif 1e32, 1e16, 1e8, 1e4, 1e2, 1e1 }; static const FPTYPE g_neg_pow[] = { #if FPDECEXP > 32 1e-256, 1e-128, 1e-64, #endif 1e-32, 1e-16, 1e-8, 1e-4, 1e-2, 1e-1 }; int mp_format_float(FPTYPE f, char *buf, size_t buf_size, char fmt, int prec, char sign) { char *s = buf; int buf_remaining = buf_size - 1; if (buf_size < 7) { // Smallest exp notion is -9e+99 which is 6 chars plus terminating // null. if (buf_size >= 2) { *s++ = '?'; } if (buf_size >= 1) { *s++ = '\0'; } return buf_size >= 2; } if (fp_signbit(f)) { *s++ = '-'; f = -f; } else { if (sign) { *s++ = sign; } } buf_remaining -= (s - buf); // Adjust for sign if (fp_isspecial(f)) { char uc = fmt & 0x20; if (fp_isinf(f)) { *s++ = 'I' ^ uc; *s++ = 'N' ^ uc; *s++ = 'F' ^ uc; goto ret; } else if (fp_isnan(f)) { *s++ = 'N' ^ uc; *s++ = 'A' ^ uc; *s++ = 'N' ^ uc; ret: *s = '\0'; return s - buf; } } if (prec < 0) { prec = 6; } char e_char = 'E' | (fmt & 0x20); // e_char will match case of fmt fmt |= 0x20; // Force fmt to be lowercase char org_fmt = fmt; if (fmt == 'g' && prec == 0) { prec = 1; } int e, e1; int dec = 0; char e_sign = '\0'; int num_digits = 0; const FPTYPE *pos_pow = g_pos_pow; const FPTYPE *neg_pow = g_neg_pow; if (fp_iszero(f)) { e = 0; if (fmt == 'e') { e_sign = '+'; } else if (fmt == 'f') { num_digits = prec + 1; } } else if (fp_isless1(f)) { // We need to figure out what an integer digit will be used // in case 'f' is used (or we revert other format to it below). // As we just tested number to be <1, this is obviously 0, // but we can round it up to 1 below. char first_dig = '0'; if (f >= FPROUND_TO_ONE) { first_dig = '1'; } // Build negative exponent for (e = 0, e1 = FPDECEXP; e1; e1 >>= 1, pos_pow++, neg_pow++) { if (*neg_pow > f) { e += e1; f *= *pos_pow; } } char e_sign_char = '-'; if (fp_isless1(f) && f >= FPROUND_TO_ONE) { f = FPCONST(1.0); if (e == 0) { e_sign_char = '+'; } } else { e++; f *= FPCONST(10.0); } // If the user specified 'g' format, and e is <= 4, then we'll switch // to the fixed format ('f') if (fmt == 'f' || (fmt == 'g' && e <= 4)) { fmt = 'f'; dec = -1; *s++ = first_dig; if (prec + e + 1 > buf_remaining) { prec = buf_remaining - e - 1; } if (org_fmt == 'g') { prec += (e - 1); } num_digits = prec; if (num_digits) { *s++ = '.'; while (--e && num_digits) { *s++ = '0'; num_digits--; } } } else { // For e & g formats, we'll be printing the exponent, so set the // sign. e_sign = e_sign_char; dec = 0; if (prec > (buf_remaining - 6)) { prec = buf_remaining - 6; if (fmt == 'g') { prec++; } } } } else { // Build positive exponent for (e = 0, e1 = FPDECEXP; e1; e1 >>= 1, pos_pow++, neg_pow++) { if (*pos_pow <= f) { e += e1; f *= *neg_pow; } } // If the user specified fixed format (fmt == 'f') and e makes the // number too big to fit into the available buffer, then we'll // switch to the 'e' format. if (fmt == 'f') { if (e >= buf_remaining) { fmt = 'e'; } else if ((e + prec + 2) > buf_remaining) { prec = buf_remaining - e - 2; if (prec < 0) { // This means no decimal point, so we can add one back // for the decimal. prec++; } } } if (fmt == 'e' && prec > (buf_remaining - 6)) { prec = buf_remaining - 6; } // If the user specified 'g' format, and e is < prec, then we'll switch // to the fixed format. if (fmt == 'g' && e < prec) { fmt = 'f'; prec -= (e + 1); } if (fmt == 'f') { dec = e; num_digits = prec + e + 1; } else { e_sign = '+'; } } if (prec < 0) { // This can happen when the prec is trimmed to prevent buffer overflow prec = 0; } // We now have num.f as a floating point number between >= 1 and < 10 // (or equal to zero), and e contains the absolute value of the power of // 10 exponent. and (dec + 1) == the number of dgits before the decimal. // For e, prec is # digits after the decimal // For f, prec is # digits after the decimal // For g, prec is the max number of significant digits // // For e & g there will be a single digit before the decimal // for f there will be e digits before the decimal if (fmt == 'e') { num_digits = prec + 1; } else if (fmt == 'g') { if (prec == 0) { prec = 1; } num_digits = prec; } // Print the digits of the mantissa for (int i = 0; i < num_digits; ++i, --dec) { int32_t d = f; *s++ = '0' + d; if (dec == 0 && prec > 0) { *s++ = '.'; } f -= (FPTYPE)d; f *= FPCONST(10.0); } // Round // If we print non-exponential format (i.e. 'f'), but a digit we're going // to round by (e) is too far away, then there's nothing to round. if ((org_fmt != 'f' || e <= 1) && f >= FPCONST(5.0)) { char *rs = s; rs--; while (1) { if (*rs == '.') { rs--; continue; } if (*rs < '0' || *rs > '9') { // + or - rs++; // So we sit on the digit to the right of the sign break; } if (*rs < '9') { (*rs)++; break; } *rs = '0'; if (rs == buf) { break; } rs--; } if (*rs == '0') { // We need to insert a 1 if (rs[1] == '.' && fmt != 'f') { // We're going to round 9.99 to 10.00 // Move the decimal point rs[0] = '.'; rs[1] = '0'; if (e_sign == '-') { e--; } else { e++; } } s++; char *ss = s; while (ss > rs) { *ss = ss[-1]; ss--; } *rs = '1'; } if (fp_isless1(f) && fmt == 'f') { // We rounded up to 1.0 prec--; } } if (org_fmt == 'g' && prec > 0) { // Remove trailing zeros and a trailing decimal point while (s[-1] == '0') { s--; } if (s[-1] == '.') { s--; } } // Append the exponent if (e_sign) { *s++ = e_char; *s++ = e_sign; *s++ = '0' + (e / 10); *s++ = '0' + (e % 10); } *s = '\0'; return s - buf; } #endif // MICROPY_FLOAT_IMPL != MICROPY_FLOAT_IMPL_NONE @ 1.1 log @Initial revision @ text @@ 1.1.1.1 log @Import micropython version 1.5.2 into othersrc. Micropython is a python3 implementation that has been optimised for micro-controllers and small embedded systems. It also has a "unix" port. It has an MIT license. This is version 1.5.2 of micropython. MicroPython implements the entire Python 3.4 syntax (including exceptions, "with", "yield from", etc.). The following core datatypes are provided: str (including basic Unicode support), bytes, bytearray, tuple, list, dict, set, frozenset, array.array, collections.namedtuple, classes and instances. Builtin modules include sys, time, and struct. Note that only subset of Python 3.4 functionality implemented for the data types and modules. This is the standard micropython source (version v1.5.2), which has been adapted to use reachover infrastructure. At the present time, libffi (from pkgsrc) is used. Alternative locations for libffi can be set using the PKGSRC_PREFIX definition to make. In the whole scheme of things, micropython is quite small: % size bin/micropython text data bss dec hex filename 393495 1624 2208 397327 6100f bin/micropython % and runs much as expected: % bin/micropython MicroPython v1.5.2 on 2016-01-13; linux version Use Ctrl-D to exit, Ctrl-E for paste mode >>> print("hello world") hello world >>> list(5 * x + y for x in range(10) for y in [4, 2, 1]) [4, 2, 1, 9, 7, 6, 14, 12, 11, 19, 17, 16, 24, 22, 21, 29, 27, 26, 34, 32, 31, 39, 37, 36, 44, 42, 41, 49, 47, 46] >>> % python2.7 Python 2.7.10 (default, Oct 17 2015, 17:55:29) [GCC 4.8.5] on netbsd7 Type "help", "copyright", "credits" or "license" for more information. >>> print("hello world") hello world >>> list(5 * x + y for x in range(10) for y in [4, 2, 1]) [4, 2, 1, 9, 7, 6, 14, 12, 11, 19, 17, 16, 24, 22, 21, 29, 27, 26, 34, 32, 31, 39, 37, 36, 44, 42, 41, 49, 47, 46] >>> ^D % This (reachover) version runs all the tests which the gmake version does. % make t cd bin && make t cd /home/agc/local/micropython/bin/../dist/unix/../tests && env MICROPY_MICROPYTHON=/home/agc/local/micropython/bin/micropython ./run-tests pass basics/0prelim.py pass basics/andor.py pass basics/array1.py pass basics/array_add.py pass basics/array_construct.py pass basics/array_construct2.py ... pass unix/ffi_callback.py pass unix/ffi_float.py pass unix/ffi_float2.py 474 tests performed (15812 individual testcases) 474 tests passed 5 tests skipped: cmd_showbc cmd_verbose machine1 machine_mem extra_coverage % The sources are available from github: https://github.com/micropython/micropython micropython release at: https://github.com/micropython/micropython/releases Sources for 1.5.2 taken from: https://github.com/micropython/micropython/archive/v1.5.2.tar.gz Alistair Crooks agc@@netbsd.org Wed Jan 13 17:15:30 PST 2016 @ text @@