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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
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/****************************************************************
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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 David M. Gay (dmg at acm dot org,
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* with " at " changed at "@" and " dot " changed to "."). */
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#include "gdtoaimp.h"
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extern ULong NanDflt_f_D2A[1];
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void
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#ifdef KR_headers
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ULtof(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
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#else
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ULtof(ULong *L, ULong *bits, Long exp, int k)
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#endif
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{
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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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*L = 0;
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break;
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case STRTOG_Normal:
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case STRTOG_NaNbits:
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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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L[0] = bits[0];
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break;
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case STRTOG_Infinite:
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L[0] = 0x7f800000;
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break;
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case STRTOG_NaN:
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L[0] = NanDflt_f_D2A[0];
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}
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if (k & STRTOG_Neg)
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L[0] |= 0x80000000L;
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}
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int
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#ifdef KR_headers
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strtorf(s, sp, rounding, f) CONST char *s; char **sp; int rounding; float *f;
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#else
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strtorf(CONST char *s, char **sp, int rounding, float *f)
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#endif
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{
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static FPI fpi0 = { 24, 1-127-24+1, 254-127-24+1, 1, SI };
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FPI *fpi, fpi1;
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ULong bits[1];
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Long exp;
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int k;
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fpi = &fpi0;
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if (rounding != FPI_Round_near) {
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fpi1 = fpi0;
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fpi1.rounding = rounding;
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fpi = &fpi1;
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}
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k = strtodg(s, sp, fpi, &exp, bits);
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ULtof((ULong*)f, bits, exp, k);
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return k;
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}
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