stdio/floatio.h

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)floatio.h   8.1 (Berkeley) 6/4/93
  37  * $FreeBSD: src/lib/libc/stdio/floatio.h,v 1.5 2004/01/18 08:28:47 das Exp $
  38  */
  39
  40 /*
  41  * Floating point scanf/printf (input/output) definitions.
  42  */
  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 **);