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freebsd/lib/libc/stdio/floatio.h
David Schultz ebbad5ec5c Rework the floating point code in printf(). Significant changes:
- We used to round long double arguments to double.  Now we print
  them properly.

- Bugs involving '%F', corner cases of '#' and 'g' format
  specifiers, and the '.*' precision specifier have been
  fixed.

- Added support for the "'" specifier to print thousands' grouping
  characters in a locale-dependent manner.

- Implement the __vfprintf() side of hexadecimal floating point
  support.  All that is still needed is a routine to convert the
  mantissa to hex digits one nibble at a time in the style of ultoa().

Reviewed by:	silence on standards@
2003-04-05 22:11:42 +00:00

57 lines
2.5 KiB
C

/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)floatio.h 8.1 (Berkeley) 6/4/93
* $FreeBSD$
*/
/*
* Floating point scanf/printf (input/output) definitions.
*/
/*
* MAXEXPDIG is the maximum number of decimal digits needed to store a
* floating point exponent in the largest supported format. It should
* be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point
* conversions are supported, ceil(log10(LDBL_MAX_EXP)). But since it
* is presently never greater than 5 in practice, we fudge it.
*/
#define MAXEXPDIG 6
#if LDBL_MAX_EXP > 999999
#error "floating point buffers too small"
#endif
char *__ldtoa(long double *, int, int, int *, int *, char **);