134 lines
3 KiB
C
134 lines
3 KiB
C
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/* $NetBSD: hexnan.c,v 1.3 2006/03/11 18:38:14 kleink Exp $ */
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/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 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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static void
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#ifdef KR_headers
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L_shift(x, x1, i) ULong *x; ULong *x1; int i;
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#else
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L_shift(ULong *x, ULong *x1, int i)
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#endif
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{
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int j;
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i = 8 - i;
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i <<= 2;
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j = ULbits - i;
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do {
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*x |= x[1] << j;
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x[1] >>= i;
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} while(++x < x1);
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}
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int
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#ifdef KR_headers
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hexnan(sp, fpi, x0)
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CONST char **sp; CONST FPI *fpi; ULong *x0;
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#else
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hexnan( CONST char **sp, CONST FPI *fpi, ULong *x0)
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#endif
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{
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ULong c, h, *x, *x1, *xe;
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CONST char *s;
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int havedig, hd0, i, nbits;
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if (!hexdig['0'])
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hexdig_init_D2A();
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nbits = fpi->nbits;
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x = x0 + ((unsigned int)nbits >> kshift);
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if (nbits & kmask)
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x++;
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*--x = 0;
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x1 = xe = x;
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havedig = hd0 = i = 0;
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s = *sp;
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while((c = *(CONST unsigned char*)++s) != 0) {
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if (!(h = hexdig[c])) {
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if (c <= ' ') {
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if (hd0 < havedig) {
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if (x < x1 && i < 8)
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L_shift(x, x1, i);
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if (x <= x0) {
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i = 8;
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continue;
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}
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hd0 = havedig;
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*--x = 0;
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x1 = x;
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i = 0;
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}
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continue;
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}
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if (/*(*/ c == ')' && havedig) {
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*sp = s + 1;
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break;
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}
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return STRTOG_NaN;
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}
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havedig++;
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if (++i > 8) {
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if (x <= x0)
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continue;
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i = 1;
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*--x = 0;
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}
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*x = (*x << 4) | (h & 0xf);
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}
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if (!havedig)
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return STRTOG_NaN;
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if (x < x1 && i < 8)
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L_shift(x, x1, i);
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if (x > x0) {
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x1 = x0;
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do *x1++ = *x++;
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while(x <= xe);
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do *x1++ = 0;
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while(x1 <= xe);
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}
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else {
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/* truncate high-order word if necessary */
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if ( (i = nbits & (ULbits-1)) !=0)
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*xe &= ((ULong)0xffffffff) >> (ULbits - i);
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}
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for(x1 = xe;; --x1) {
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if (*x1 != 0)
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break;
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if (x1 == x0) {
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*x1 = 1;
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break;
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}
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}
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return STRTOG_NaNbits;
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}
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