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Annotation of sbbs/javascript/include/mozilla/js/jsdtoa.h, revision 1.1

1.1     ! root        1: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
        !             2:  *
        !             3:  * The contents of this file are subject to the Netscape Public
        !             4:  * License Version 1.1 (the "License"); you may not use this file
        !             5:  * except in compliance with the License. You may obtain a copy of
        !             6:  * the License at http://www.mozilla.org/NPL/
        !             7:  *
        !             8:  * Software distributed under the License is distributed on an "AS
        !             9:  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
        !            10:  * implied. See the License for the specific language governing
        !            11:  * rights and limitations under the License.
        !            12:  *
        !            13:  * The Original Code is Mozilla Communicator client code, released
        !            14:  * March 31, 1998.
        !            15:  *
        !            16:  * The Initial Developer of the Original Code is Netscape
        !            17:  * Communications Corporation.  Portions created by Netscape are
        !            18:  * Copyright (C) 1998 Netscape Communications Corporation. All
        !            19:  * Rights Reserved.
        !            20:  *
        !            21:  * Contributor(s): 
        !            22:  *
        !            23:  * Alternatively, the contents of this file may be used under the
        !            24:  * terms of the GNU Public License (the "GPL"), in which case the
        !            25:  * provisions of the GPL are applicable instead of those above.
        !            26:  * If you wish to allow use of your version of this file only
        !            27:  * under the terms of the GPL and not to allow others to use your
        !            28:  * version of this file under the NPL, indicate your decision by
        !            29:  * deleting the provisions above and replace them with the notice
        !            30:  * and other provisions required by the GPL.  If you do not delete
        !            31:  * the provisions above, a recipient may use your version of this
        !            32:  * file under either the NPL or the GPL.
        !            33:  */
        !            34: 
        !            35: #ifndef jsdtoa_h___
        !            36: #define jsdtoa_h___
        !            37: /*
        !            38:  * Public interface to portable double-precision floating point to string
        !            39:  * and back conversion package.
        !            40:  */
        !            41: 
        !            42: #include "jscompat.h"
        !            43: 
        !            44: JS_BEGIN_EXTERN_C
        !            45: 
        !            46: /*
        !            47:  * JS_strtod() returns as a double-precision floating-point number
        !            48:  * the  value represented by the character string pointed to by
        !            49:  * s00.  The string is scanned up to  the  first  unrecognized
        !            50:  * character.
        !            51:  * If the value of se is not (char **)NULL,  a  pointer  to
        !            52:  * the  character terminating the scan is returned in the location pointed
        !            53:  * to by se.  If no number can be  formed, se is set to s00r, and
        !            54:  * zero is returned.
        !            55:  *
        !            56:  * *err is set to zero on success; it's set to JS_DTOA_ERANGE on range
        !            57:  * errors and JS_DTOA_ENOMEM on memory failure.
        !            58:  */
        !            59: #define JS_DTOA_ERANGE 1
        !            60: #define JS_DTOA_ENOMEM 2
        !            61: JS_FRIEND_API(double)
        !            62: JS_strtod(const char *s00, char **se, int *err);
        !            63: 
        !            64: /*
        !            65:  * Modes for converting floating-point numbers to strings.
        !            66:  *
        !            67:  * Some of the modes can round-trip; this means that if the number is converted to
        !            68:  * a string using one of these mode and then converted back to a number, the result
        !            69:  * will be identical to the original number (except that, due to ECMA, -0 will get converted
        !            70:  * to +0).  These round-trip modes return the minimum number of significand digits that
        !            71:  * permit the round trip.
        !            72:  *
        !            73:  * Some of the modes take an integer parameter <precision>.
        !            74:  */
        !            75: /* NB: Keep this in sync with number_constants[]. */
        !            76: typedef enum JSDToStrMode {
        !            77:     DTOSTR_STANDARD,              /* Either fixed or exponential format; round-trip */
        !            78:     DTOSTR_STANDARD_EXPONENTIAL,  /* Always exponential format; round-trip */
        !            79:     DTOSTR_FIXED,                 /* Round to <precision> digits after the decimal point; exponential if number is large */
        !            80:     DTOSTR_EXPONENTIAL,           /* Always exponential format; <precision> significant digits */
        !            81:     DTOSTR_PRECISION              /* Either fixed or exponential format; <precision> significant digits */
        !            82: } JSDToStrMode;
        !            83: 
        !            84: 
        !            85: /* Maximum number of characters (including trailing null) that a DTOSTR_STANDARD or DTOSTR_STANDARD_EXPONENTIAL
        !            86:  * conversion can produce.  This maximum is reached for a number like -0.0000012345678901234567. */
        !            87: #define DTOSTR_STANDARD_BUFFER_SIZE 26
        !            88: 
        !            89: /* Maximum number of characters (including trailing null) that one of the other conversions
        !            90:  * can produce.  This maximum is reached for TO_FIXED, which can generate up to 21 digits before the decimal point. */
        !            91: #define DTOSTR_VARIABLE_BUFFER_SIZE(precision) ((precision)+24 > DTOSTR_STANDARD_BUFFER_SIZE ? (precision)+24 : DTOSTR_STANDARD_BUFFER_SIZE)
        !            92: 
        !            93: /*
        !            94:  * Convert dval according to the given mode and return a pointer to the resulting ASCII string.
        !            95:  * The result is held somewhere in buffer, but not necessarily at the beginning.  The size of
        !            96:  * buffer is given in bufferSize, and must be at least as large as given by the above macros.
        !            97:  *
        !            98:  * Return NULL if out of memory.
        !            99:  */
        !           100: JS_FRIEND_API(char *)
        !           101: JS_dtostr(char *buffer, size_t bufferSize, JSDToStrMode mode, int precision, double dval);
        !           102: 
        !           103: /*
        !           104:  * Convert d to a string in the given base.  The integral part of d will be printed exactly
        !           105:  * in that base, regardless of how large it is, because there is no exponential notation for non-base-ten
        !           106:  * numbers.  The fractional part will be rounded to as few digits as possible while still preserving
        !           107:  * the round-trip property (analogous to that of printing decimal numbers).  In other words, if one were
        !           108:  * to read the resulting string in via a hypothetical base-number-reading routine that rounds to the nearest
        !           109:  * IEEE double (and to an even significand if there are two equally near doubles), then the result would
        !           110:  * equal d (except for -0.0, which converts to "0", and NaN, which is not equal to itself).
        !           111:  *
        !           112:  * Return NULL if out of memory.  If the result is not NULL, it must be released via free().
        !           113:  */
        !           114: JS_FRIEND_API(char *)
        !           115: JS_dtobasestr(int base, double d);
        !           116: 
        !           117: /*
        !           118:  * Clean up any persistent RAM allocated during the execution of DtoA
        !           119:  * routines, and remove any locks that might have been created.
        !           120:  */
        !           121: extern void js_FinishDtoa(void);
        !           122: 
        !           123: JS_END_EXTERN_C
        !           124: 
        !           125: #endif /* jsdtoa_h___ */

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