mirror of
https://github.com/bellard/quickjs.git
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84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
/*
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* Tiny float64 printing and parsing library
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*
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* Copyright (c) 2024 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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
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* 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
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, 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
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* THE SOFTWARE.
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*/
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//#define JS_DTOA_DUMP_STATS
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/* maximum number of digits for fixed and frac formats */
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#define JS_DTOA_MAX_DIGITS 101
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/* radix != 10 is only supported with flags = JS_DTOA_FORMAT_FREE */
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/* use as many digits as necessary */
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#define JS_DTOA_FORMAT_FREE (0 << 0)
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/* use n_digits significant digits (1 <= n_digits <= JS_DTOA_MAX_DIGITS) */
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#define JS_DTOA_FORMAT_FIXED (1 << 0)
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/* force fractional format: [-]dd.dd with n_digits fractional digits.
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0 <= n_digits <= JS_DTOA_MAX_DIGITS */
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#define JS_DTOA_FORMAT_FRAC (2 << 0)
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#define JS_DTOA_FORMAT_MASK (3 << 0)
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/* select exponential notation either in fixed or free format */
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#define JS_DTOA_EXP_AUTO (0 << 2)
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#define JS_DTOA_EXP_ENABLED (1 << 2)
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#define JS_DTOA_EXP_DISABLED (2 << 2)
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#define JS_DTOA_EXP_MASK (3 << 2)
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#define JS_DTOA_MINUS_ZERO (1 << 4) /* show the minus sign for -0 */
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/* only accepts integers (no dot, no exponent) */
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#define JS_ATOD_INT_ONLY (1 << 0)
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/* accept Oo and Ob prefixes in addition to 0x prefix if radix = 0 */
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#define JS_ATOD_ACCEPT_BIN_OCT (1 << 1)
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/* accept O prefix as octal if radix == 0 and properly formed (Annex B) */
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#define JS_ATOD_ACCEPT_LEGACY_OCTAL (1 << 2)
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/* accept _ between digits as a digit separator */
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#define JS_ATOD_ACCEPT_UNDERSCORES (1 << 3)
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typedef struct {
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uint64_t mem[37];
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} JSDTOATempMem;
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typedef struct {
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uint64_t mem[27];
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} JSATODTempMem;
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/* return a maximum bound of the string length */
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int js_dtoa_max_len(double d, int radix, int n_digits, int flags);
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/* return the string length */
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int js_dtoa(char *buf, double d, int radix, int n_digits, int flags,
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JSDTOATempMem *tmp_mem);
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double js_atod(const char *str, const char **pnext, int radix, int flags,
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JSATODTempMem *tmp_mem);
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#ifdef JS_DTOA_DUMP_STATS
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void js_dtoa_dump_stats(void);
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#endif
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/* additional exported functions */
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size_t u32toa(char *buf, uint32_t n);
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size_t i32toa(char *buf, int32_t n);
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size_t u64toa(char *buf, uint64_t n);
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size_t i64toa(char *buf, int64_t n);
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size_t u64toa_radix(char *buf, uint64_t n, unsigned int radix);
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size_t i64toa_radix(char *buf, int64_t n, unsigned int radix);
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