1 /* $OpenBSD: floatio.h,v 1.4 2008/09/07 20:36:08 martynas Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Floating point scanf/printf (input/output) definitions. 37 */ 38 39 /* 11-bit exponent (VAX G floating point) is 308 decimal digits */ 40 #define MAXEXP 308 41 /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */ 42 #define MAXFRACT 39 43 44 /* 45 * MAXEXPDIG is the maximum number of decimal digits needed to store a 46 * floating point exponent in the largest supported format. It should 47 * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point 48 * conversions are supported, ceil(log10(LDBL_MAX_EXP)). But since it 49 * is presently never greater than 5 in practice, we fudge it. 50 */ 51 #define MAXEXPDIG 6 52 #if LDBL_MAX_EXP > 999999 53 #error "floating point buffers too small" 54 #endif 55 56 char *__hdtoa(double, const char *, int, int *, int *, char **); 57 char *__hldtoa(long double, const char *, int, int *, int *, char **); 58 char *__ldtoa(long double *, int, int, int *, int *, char **); 59
