snprintf/floatio.h

   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 **);