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120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 1998 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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#undef _0
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#undef _1
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/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
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#ifdef IEEE_MC68k
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#define _0 0
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#define _1 1
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#define _2 2
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#define _3 3
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#define _4 4
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#endif
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#ifdef IEEE_8087
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#define _0 4
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#define _1 3
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#define _2 2
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#define _3 1
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#define _4 0
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#endif
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char*
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#ifdef KR_headers
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g_xfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; size_t bufsize;
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#else
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g_xfmt(char *buf, void *V, int ndig, size_t bufsize)
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#endif
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{
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static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 };
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char *b, *s, *se;
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ULong bits[2], sign;
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UShort *L;
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int decpt, ex, i, mode;
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#ifdef Honor_FLT_ROUNDS
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#include "gdtoa_fltrnds.h"
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#else
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#define fpi &fpi0
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#endif
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if (ndig < 0)
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ndig = 0;
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if (bufsize < ndig + 10)
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return 0;
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L = (UShort *)V;
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sign = L[_0] & 0x8000;
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bits[1] = (L[_1] << 16) | L[_2];
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bits[0] = (L[_3] << 16) | L[_4];
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if ( (ex = L[_0] & 0x7fff) !=0) {
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if (ex == 0x7fff) {
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/* Infinity or NaN */
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if (bits[0] | bits[1])
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b = strcp(buf, "NaN");
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else {
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b = buf;
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if (sign)
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*b++ = '-';
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b = strcp(b, "Infinity");
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}
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return b;
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}
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i = STRTOG_Normal;
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}
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else if (bits[0] | bits[1]) {
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i = STRTOG_Denormal;
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ex = 1;
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}
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else {
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b = buf;
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#ifndef IGNORE_ZERO_SIGN
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if (sign)
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*b++ = '-';
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#endif
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*b++ = '0';
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*b = 0;
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return b;
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}
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ex -= 0x3fff + 63;
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mode = 2;
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if (ndig <= 0) {
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if (bufsize < 32)
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return 0;
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mode = 0;
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}
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s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
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return g__fmt(buf, s, se, decpt, sign, bufsize);
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}
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