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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998, 2000 by Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Please send bug reports to
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David M. Gay
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Bell Laboratories, Room 2C-463
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600 Mountain Avenue
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Murray Hill, NJ 07974-0636
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U.S.A.
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dmg@bell-labs.com
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*/
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#include "gdtoaimp.h"
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float
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#ifdef KR_headers
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strtof(s, sp) CONST char *s; char **sp;
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#else
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strtof(CONST char *s, char **sp)
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#endif
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{
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#ifdef Sudden_Underflow
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static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 1 };
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#else
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static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 0 };
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#endif
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ULong bits[1];
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Long exp;
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int k;
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union { ULong L[1]; float f; } u;
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k = strtodg(s, sp, &fpi, &exp, bits);
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switch(k & STRTOG_Retmask) {
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case STRTOG_NoNumber:
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case STRTOG_Zero:
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u.L[0] = 0;
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break;
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case STRTOG_Normal:
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case STRTOG_NaNbits:
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u.L[0] = bits[0] & 0x7fffff | exp + 0x7f + 23 << 23;
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break;
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case STRTOG_Denormal:
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u.L[0] = bits[0];
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break;
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case STRTOG_Infinite:
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u.L[0] = 0x7f800000;
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break;
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case STRTOG_NaN:
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u.L[0] = 0x7fffffff;
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}
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if (k & STRTOG_Neg)
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u.L[0] |= 0x80000000L;
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return u.f;
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}
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