| 1 | /* $OpenBSD: floatio.h,v 1.4 2008/09/07 20:36:08 martynas Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | * |
| 6 | * Copyright (C) 1990, 1993 |
| 7 | * The Regents of the University of California. All rights reserved. |
| 8 | * |
| 9 | * This code is derived from software contributed to Berkeley by |
| 10 | * Chris Torek. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * Floating point scanf/printf (input/output) definitions. |
| 15 | */ |
| 16 | |
| 17 | /* 11-bit exponent (VAX G floating point) is 308 decimal digits */ |
| 18 | #define MAXEXP 308 |
| 19 | /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */ |
| 20 | #define MAXFRACT 39 |
| 21 | |
| 22 | /* |
| 23 | * MAXEXPDIG is the maximum number of decimal digits needed to store a |
| 24 | * floating point exponent in the largest supported format. It should |
| 25 | * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point |
| 26 | * conversions are supported, ceil(log10(LDBL_MAX_EXP)). But since it |
| 27 | * is presently never greater than 5 in practice, we fudge it. |
| 28 | */ |
| 29 | #define MAXEXPDIG 6 |
| 30 | #if LDBL_MAX_EXP > 999999 |
| 31 | #error "floating point buffers too small" |
| 32 | #endif |
| 33 | |
| 34 | char *__hdtoa(double, const char *, int, int *, int *, char **) |
| 35 | __attribute__((visibility("hidden"))); |
| 36 | |
| 37 | char *__hldtoa(long double, const char *, int, int *, int *, char **) |
| 38 | __attribute__((visibility("hidden"))); |
| 39 | |
| 40 | char *__ldtoa(long double *, int, int, int *, int *, char **) |
| 41 | __attribute__((visibility("hidden"))); |