snprintf/floatio.h

   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 char *__hldtoa(long double, const char *, int, int *, int *, char **);
  36 char *__ldtoa(long double *, int, int, int *, int *, char **);