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libretroadmin
cf9d102864
The libretro-common submodule pinned the standalone repository at 76a3d54. It is replaced by an in-tree copy of RetroArch master (b655a20) holding only what the core uses: the VFS, file, string, encoding, compat and time sources it already built, the headers they and the core include, the threading set - rthreads, retro_atomic, retro_spsc and retro_waitable_spsc, mpsc_stack, retro_triple_buffer, retro_eventcount, retro_asym_eventcount, retro_procbarrier and tpool, with features_cpu and rstrtod, which they need - and the codecs that replace the bundled zlib, zstd, libchdr, libzip and libpng: rinflate and rdeflate, rzstd, rchd with its LZMA and FLAC decoders, rzip_archive, rpng and crc32. stdstring.c, which nothing calls, is no longer built. The threading sources are always built, by both the static Makefile and CMake; the VFS set stays behind HAVE_LIBRETRO_VFS as before. The codecs are built by the change that switches the core over to them.
109 lines
4.3 KiB
C
109 lines
4.3 KiB
C
/* Copyright (C) 2010-2026 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (rstrtod.h).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* Decimal to binary floating point, correctly rounded.
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*
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* strtod() from the C library would do this, except that it reads the
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* decimal separator from the current locale: the same settings file
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* parses differently once someone's LC_NUMERIC says a comma. These
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* functions always take '.', never consult the locale, and never touch
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* errno, so a value written on one machine reads back the same on
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* another.
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*
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* The result is the nearest double (or float) to the exact decimal
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* value, ties resolved to even -- the same answer a correctly rounded
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* strtod() gives, for every input. Where the C library differs, the C
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* library is wrong.
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*
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* The caller passes a length rather than relying on a terminator, so a
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* number sitting inside a larger buffer needs no copy. On success the
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* end pointer reports how much was consumed, which lets a caller reject
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* trailing junk it did not expect.
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*
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* Accepted: an optional sign, decimal digits with an optional '.', an
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* optional 'e'/'E' exponent with optional sign, and the special forms
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* "inf", "infinity" and "nan" in any case. Values too large become
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* infinity and values too small become zero, both with the right sign;
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* neither is reported as an error, matching strtod().
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*/
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#ifndef __LIBRETRO_SDK_STRING_RSTRTOD_H
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#define __LIBRETRO_SDK_STRING_RSTRTOD_H
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#include <stddef.h>
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#include <retro_common_api.h>
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RETRO_BEGIN_DECLS
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/**
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* rstrtod_len:
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* @str : bytes to read, need not be NUL-terminated
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* @len : length of @str
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* @end : filled with how many bytes were consumed
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*
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* Reads a decimal number, ignoring the locale. Leading whitespace is
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* skipped. @end may be NULL; when it is not, it receives 0 if nothing
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* could be read, in which case the return value is 0.0.
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*
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* Returns: the nearest double to the value read, ties to even.
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*/
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double rstrtod_len(const char *str, size_t len, size_t *end);
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/**
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* rstrtof_len:
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* @str : bytes to read, need not be NUL-terminated
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* @len : length of @str
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* @end : filled with how many bytes were consumed
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*
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* As rstrtod_len(), rounding once to float rather than twice through
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* double -- a double rounding would be wrong for some inputs.
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*
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* Returns: the nearest float to the value read, ties to even.
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*/
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float rstrtof_len(const char *str, size_t len, size_t *end);
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/**
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* rstrtod:
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* @str : NUL-terminated bytes to read
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* @end : filled with a pointer past what was consumed
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*
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* The strtod()-shaped spelling, for callers that have a C string.
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* @end may be NULL.
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*
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* Returns: the nearest double to the value read.
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*/
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double rstrtod(const char *str, char **end);
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/**
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* rstrtof:
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* @str : NUL-terminated bytes to read
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* @end : filled with a pointer past what was consumed
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*
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* Returns: the nearest float to the value read.
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*/
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float rstrtof(const char *str, char **end);
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RETRO_END_DECLS
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#endif
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