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Commit	Line	Data
	1	/****************************************************************
	2
	3	The author of this software is David M. Gay.
	4
	5	Copyright (C) 1998, 2000 by Lucent Technologies
	6	All Rights Reserved
	7
	8	Permission to use, copy, modify, and distribute this software and
	9	its documentation for any purpose and without fee is hereby
	10	granted, provided that the above copyright notice appear in all
	11	copies and that both that the copyright notice and this
	12	permission notice and warranty disclaimer appear in supporting
	13	documentation, and that the name of Lucent or any of its entities
	14	not be used in advertising or publicity pertaining to
	15	distribution of the software without specific, written prior
	16	permission.
	17
	18	LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	19	INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
	20	IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
	21	SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	22	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
	23	IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
	24	ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
	25	THIS SOFTWARE.
	26
	27	****************************************************************/
	28
	29	/* Please send bug reports to
	30	David M. Gay
	31	Bell Laboratories, Room 2C-463
	32	600 Mountain Avenue
	33	Murray Hill, NJ 07974-0636
	34	U.S.A.
	35	dmg@bell-labs.com
	36	*/
	37
	38	#include "gdtoaimp.h"
	39
	40	float
	41	#ifdef KR_headers
	42	strtof(s, sp) CONST char s; char *sp;
	43	#else
	44	strtof(CONST char s, char *sp)
	45	#endif
	46	{
	47	#ifdef Sudden_Underflow
	48	static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 1 };
	49	#else
	50	static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 0 };
	51	#endif
	52	ULong bits[1];
	53	Long exp;
	54	int k;
	55	union { ULong L[1]; float f; } u;
	56
	57	k = strtodg(s, sp, &fpi, &exp, bits);
	58	switch(k & STRTOG_Retmask) {
	59	case STRTOG_NoNumber:
	60	case STRTOG_Zero:
	61	u.L[0] = 0;
	62	break;
	63
	64	case STRTOG_Normal:
	65	case STRTOG_NaNbits:
	66	u.L[0] = bits[0] & 0x7fffff \| exp + 0x7f + 23 << 23;
	67	break;
	68
	69	case STRTOG_Denormal:
	70	u.L[0] = bits[0];
	71	break;
	72
	73	case STRTOG_Infinite:
	74	u.L[0] = 0x7f800000;
	75	break;
	76
	77	case STRTOG_NaN:
	78	u.L[0] = 0x7fffffff;
	79	}
	80	if (k & STRTOG_Neg)
	81	u.L[0] \|= 0x80000000L;
	82	return u.f;
	83	}