[lttng-ust.git] / snprintf / floatio.h

/*	$OpenBSD: floatio.h,v 1.4 2008/09/07 20:36:08 martynas Exp $	*/

/*
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#include "ust-helper.h"

/*
 * Floating point scanf/printf (input/output) definitions.
 */

/* 11-bit exponent (VAX G floating point) is 308 decimal digits */
#define	MAXEXP		308
/* 128 bit fraction takes up 39 decimal digits; max reasonable precision */
#define	MAXFRACT	39

/*
 * 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

LTTNG_HIDDEN
char *__hdtoa(double, const char *, int, int *, int *, char **);
LTTNG_HIDDEN
char *__hldtoa(long double, const char *, int, int *, int *, char **);
LTTNG_HIDDEN
char *__ldtoa(long double *, int, int, int *, int *, char **);
Commit	Line	Data
	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 **);