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 #include "ust-helper.h"
  14
  15 /*
  16  * Floating point scanf/printf (input/output) definitions.
  17  */
  18
  19 /* 11-bit exponent (VAX G floating point) is 308 decimal digits */
  20 #define MAXEXP          308
  21 /* 128 bit fraction takes up 39 decimal digits; max reasonable precision */
  22 #define MAXFRACT        39
  23
  24 /*
  25  * MAXEXPDIG is the maximum number of decimal digits needed to store a
  26  * floating point exponent in the largest supported format.  It should
  27  * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point
  28  * conversions are supported, ceil(log10(LDBL_MAX_EXP)).  But since it
  29  * is presently never greater than 5 in practice, we fudge it.
  30  */
  31 #define MAXEXPDIG       6
  32 #if LDBL_MAX_EXP > 999999
  33 #error "floating point buffers too small"
  34 #endif
  35
  36 LTTNG_HIDDEN
  37 char *__hdtoa(double, const char *, int, int *, int *, char **);
  38 LTTNG_HIDDEN
  39 char *__hldtoa(long double, const char *, int, int *, int *, char **);
  40 LTTNG_HIDDEN
  41 char *__ldtoa(long double *, int, int, int *, int *, char **);