dtoa.h (3306B)
1 /* 2 * Tiny float64 printing and parsing library 3 * 4 * Copyright (c) 2024 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 //#define JS_DTOA_DUMP_STATS 26 27 /* maximum number of digits for fixed and frac formats */ 28 #define JS_DTOA_MAX_DIGITS 101 29 30 /* radix != 10 is only supported with flags = JS_DTOA_FORMAT_FREE */ 31 /* use as many digits as necessary */ 32 #define JS_DTOA_FORMAT_FREE (0 << 0) 33 /* use n_digits significant digits (1 <= n_digits <= JS_DTOA_MAX_DIGITS) */ 34 #define JS_DTOA_FORMAT_FIXED (1 << 0) 35 /* force fractional format: [-]dd.dd with n_digits fractional digits. 36 0 <= n_digits <= JS_DTOA_MAX_DIGITS */ 37 #define JS_DTOA_FORMAT_FRAC (2 << 0) 38 #define JS_DTOA_FORMAT_MASK (3 << 0) 39 40 /* select exponential notation either in fixed or free format */ 41 #define JS_DTOA_EXP_AUTO (0 << 2) 42 #define JS_DTOA_EXP_ENABLED (1 << 2) 43 #define JS_DTOA_EXP_DISABLED (2 << 2) 44 #define JS_DTOA_EXP_MASK (3 << 2) 45 46 #define JS_DTOA_MINUS_ZERO (1 << 4) /* show the minus sign for -0 */ 47 48 /* only accepts integers (no dot, no exponent) */ 49 #define JS_ATOD_INT_ONLY (1 << 0) 50 /* accept Oo and Ob prefixes in addition to 0x prefix if radix = 0 */ 51 #define JS_ATOD_ACCEPT_BIN_OCT (1 << 1) 52 /* accept O prefix as octal if radix == 0 and properly formed (Annex B) */ 53 #define JS_ATOD_ACCEPT_LEGACY_OCTAL (1 << 2) 54 /* accept _ between digits as a digit separator */ 55 #define JS_ATOD_ACCEPT_UNDERSCORES (1 << 3) 56 57 typedef struct { 58 uint64_t mem[37]; 59 } JSDTOATempMem; 60 61 typedef struct { 62 uint64_t mem[27]; 63 } JSATODTempMem; 64 65 /* return a maximum bound of the string length */ 66 int js_dtoa_max_len(double d, int radix, int n_digits, int flags); 67 /* return the string length */ 68 int js_dtoa(char *buf, double d, int radix, int n_digits, int flags, 69 JSDTOATempMem *tmp_mem); 70 double js_atod(const char *str, const char **pnext, int radix, int flags, 71 JSATODTempMem *tmp_mem); 72 73 #ifdef JS_DTOA_DUMP_STATS 74 void js_dtoa_dump_stats(void); 75 #endif 76 77 /* additional exported functions */ 78 size_t u32toa(char *buf, uint32_t n); 79 size_t i32toa(char *buf, int32_t n); 80 size_t u64toa(char *buf, uint64_t n); 81 size_t i64toa(char *buf, int64_t n); 82 size_t u64toa_radix(char *buf, uint64_t n, unsigned int radix); 83 size_t i64toa_radix(char *buf, int64_t n, unsigned int radix);