gecko/js/src/jsdtoa.h
Paul Biggar 43b850291d Bug 643548: Remove mozalloc_undef_macro_wrappers hack from JS engine. (r=luke,rs=brendan)
mozalloc_undef_macro_wrappers are brittle and have side-effects that are hard
to debug and fix. The alternative is the just stick an underscore on the end of
malloc, free, etc, which is a comparatively small burden.
2011-03-31 01:14:12 -07:00

149 lines
6.2 KiB
C

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsdtoa_h___
#define jsdtoa_h___
/*
* Public interface to portable double-precision floating point to string
* and back conversion package.
*/
#include "jscompat.h"
JS_BEGIN_EXTERN_C
struct DtoaState;
DtoaState *
js_NewDtoaState();
void
js_DestroyDtoaState(DtoaState *state);
/*
* js_strtod_harder() returns as a double-precision floating-point number the
* value represented by the character string pointed to by s00. The string is
* scanned up to the first unrecognized character.
*
* If se is not NULL, *se receives a pointer to the character terminating the
* scan. If no number can be formed, *se receives a pointer to the first
* unparseable character in s00, and zero is returned.
*
* *err is set to zero on success; it's set to JS_DTOA_ERANGE on range
* errors and JS_DTOA_ENOMEM on memory failure.
*/
#define JS_DTOA_ERANGE 1
#define JS_DTOA_ENOMEM 2
double
js_strtod_harder(DtoaState *state, const char *s00, char **se, int *err);
/*
* Modes for converting floating-point numbers to strings.
*
* Some of the modes can round-trip; this means that if the number is converted to
* a string using one of these mode and then converted back to a number, the result
* will be identical to the original number (except that, due to ECMA, -0 will get converted
* to +0). These round-trip modes return the minimum number of significand digits that
* permit the round trip.
*
* Some of the modes take an integer parameter <precision>.
*/
/* NB: Keep this in sync with number_constants[]. */
typedef enum JSDToStrMode {
DTOSTR_STANDARD, /* Either fixed or exponential format; round-trip */
DTOSTR_STANDARD_EXPONENTIAL, /* Always exponential format; round-trip */
DTOSTR_FIXED, /* Round to <precision> digits after the decimal point; exponential if number is large */
DTOSTR_EXPONENTIAL, /* Always exponential format; <precision> significant digits */
DTOSTR_PRECISION /* Either fixed or exponential format; <precision> significant digits */
} JSDToStrMode;
/* Maximum number of characters (including trailing null) that a DTOSTR_STANDARD or DTOSTR_STANDARD_EXPONENTIAL
* conversion can produce. This maximum is reached for a number like -0.0000012345678901234567. */
#define DTOSTR_STANDARD_BUFFER_SIZE 26
/* Maximum number of characters (including trailing null) that one of the other conversions
* can produce. This maximum is reached for TO_FIXED, which can generate up to 21 digits before the decimal point. */
#define DTOSTR_VARIABLE_BUFFER_SIZE(precision) ((precision)+24 > DTOSTR_STANDARD_BUFFER_SIZE ? (precision)+24 : DTOSTR_STANDARD_BUFFER_SIZE)
/*
* DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a
* better function to use.
*
* Convert dval according to the given mode and return a pointer to the
* resulting ASCII string. If mode == DTOSTR_STANDARD and precision == 0 it's
* equivalent to ToString() as specified by ECMA-262-5 section 9.8.1, but it
* doesn't handle integers specially so should be avoided in that case (that's
* why js::NumberToCString() is better).
*
* The result is held somewhere in buffer, but not necessarily at the
* beginning. The size of buffer is given in bufferSize, and must be at least
* as large as given by the above macros.
*
* Return NULL if out of memory.
*/
char *
js_dtostr(DtoaState *state, char *buffer, size_t bufferSize, JSDToStrMode mode, int precision,
double dval);
/*
* DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a
* better function to use.
*
* Convert d to a string in the given base. The integral part of d will be
* printed exactly in that base, regardless of how large it is, because there
* is no exponential notation for non-base-ten numbers. The fractional part
* will be rounded to as few digits as possible while still preserving the
* round-trip property (analogous to that of printing decimal numbers). In
* other words, if one were to read the resulting string in via a hypothetical
* base-number-reading routine that rounds to the nearest IEEE double (and to
* an even significand if there are two equally near doubles), then the result
* would equal d (except for -0.0, which converts to "0", and NaN, which is
* not equal to itself).
*
* Return NULL if out of memory. If the result is not NULL, it must be
* released via cx->free_().
*/
char *
js_dtobasestr(DtoaState *state, int base, double d);
JS_END_EXTERN_C
#endif /* jsdtoa_h___ */