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113 lines
4.7 KiB
C
113 lines
4.7 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jsdtoa_h
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#define jsdtoa_h
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/*
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* Public interface to portable double-precision floating point to string
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* and back conversion package.
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*/
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#include <stddef.h>
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struct DtoaState;
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DtoaState *
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js_NewDtoaState();
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void
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js_DestroyDtoaState(DtoaState *state);
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/*
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* js_strtod_harder() returns as a double-precision floating-point number the
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* value represented by the character string pointed to by s00. The string is
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* scanned up to the first unrecognized character.
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*
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* If se is not nullptr, *se receives a pointer to the character terminating
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* the scan. If no number can be formed, *se receives a pointer to the first
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* unparseable character in s00, and zero is returned.
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*
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* On overflow, this function returns infinity and does not indicate an error.
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*
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* *err is set to zero on success; it's set to JS_DTOA_ENOMEM on memory failure.
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*/
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#define JS_DTOA_ENOMEM 2
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double
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js_strtod_harder(DtoaState *state, const char *s00, char **se, int *err);
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/*
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* Modes for converting floating-point numbers to strings.
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*
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* Some of the modes can round-trip; this means that if the number is converted to
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* a string using one of these mode and then converted back to a number, the result
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* will be identical to the original number (except that, due to ECMA, -0 will get converted
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* to +0). These round-trip modes return the minimum number of significand digits that
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* permit the round trip.
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*
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* Some of the modes take an integer parameter <precision>.
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*/
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/* NB: Keep this in sync with number_constants[]. */
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typedef enum JSDToStrMode {
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DTOSTR_STANDARD, /* Either fixed or exponential format; round-trip */
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DTOSTR_STANDARD_EXPONENTIAL, /* Always exponential format; round-trip */
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DTOSTR_FIXED, /* Round to <precision> digits after the decimal point; exponential if number is large */
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DTOSTR_EXPONENTIAL, /* Always exponential format; <precision> significant digits */
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DTOSTR_PRECISION /* Either fixed or exponential format; <precision> significant digits */
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} JSDToStrMode;
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/* Maximum number of characters (including trailing null) that a DTOSTR_STANDARD or DTOSTR_STANDARD_EXPONENTIAL
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* conversion can produce. This maximum is reached for a number like -0.0000012345678901234567. */
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#define DTOSTR_STANDARD_BUFFER_SIZE 26
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/* Maximum number of characters (including trailing null) that one of the other conversions
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* can produce. This maximum is reached for TO_FIXED, which can generate up to 21 digits before the decimal point. */
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#define DTOSTR_VARIABLE_BUFFER_SIZE(precision) ((precision)+24 > DTOSTR_STANDARD_BUFFER_SIZE ? (precision)+24 : DTOSTR_STANDARD_BUFFER_SIZE)
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/*
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* DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a
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* better function to use.
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*
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* Convert dval according to the given mode and return a pointer to the
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* resulting ASCII string. If mode == DTOSTR_STANDARD and precision == 0 it's
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* equivalent to ToString() as specified by ECMA-262-5 section 9.8.1, but it
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* doesn't handle integers specially so should be avoided in that case (that's
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* why js::NumberToCString() is better).
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*
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* The result is held somewhere in buffer, but not necessarily at the
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* beginning. The size of buffer is given in bufferSize, and must be at least
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* as large as given by the above macros.
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*
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* Return nullptr if out of memory.
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*/
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char *
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js_dtostr(DtoaState *state, char *buffer, size_t bufferSize, JSDToStrMode mode, int precision,
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double dval);
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/*
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* DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a
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* better function to use.
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*
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* Convert d to a string in the given base. The integral part of d will be
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* printed exactly in that base, regardless of how large it is, because there
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* is no exponential notation for non-base-ten numbers. The fractional part
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* will be rounded to as few digits as possible while still preserving the
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* round-trip property (analogous to that of printing decimal numbers). In
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* other words, if one were to read the resulting string in via a hypothetical
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* base-number-reading routine that rounds to the nearest IEEE double (and to
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* an even significand if there are two equally near doubles), then the result
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* would equal d (except for -0.0, which converts to "0", and NaN, which is
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* not equal to itself).
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*
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* Return nullptr if out of memory. If the result is not nullptr, it must be
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* released via js_free().
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*/
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char *
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js_dtobasestr(DtoaState *state, int base, double d);
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#endif /* jsdtoa_h */
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