mirror of
https://github.com/jart/cosmopolitan.git
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2fc507c98f
* modelines: tw -> sw shiftwidth, not textwidth. * space-surround modelines * fix irregular modelines * Fix modeline in titlegen.c
105 lines
4.6 KiB
C
105 lines
4.6 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ The author of this software is David M. Gay. │
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│ Please send bug reports to David M. Gay <dmg@acm.org> │
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│ or Justine Tunney <jtunney@gmail.com> │
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│ │
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│ Copyright (C) 1998, 1999 by Lucent Technologies │
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│ All Rights Reserved │
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│ │
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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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│ │
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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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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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#include "third_party/gdtoa/gdtoa.h"
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#include "third_party/gdtoa/gdtoa.internal.h"
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/**
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* Converts quadruple-precision floating-point number to string.
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*/
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char*
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g_Qfmt_p(char *buf, void *V, int ndig, size_t bufsize, int nik)
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{
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static const FPI fpi0 = { 113, 1-16383-113+1, 32766 - 16383 - 113 + 1, 1, 0, Int_max };
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char *b, *s, *se;
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ULong bits[4], *L, sign;
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int decpt, ex, i, mode;
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#include "third_party/gdtoa/gdtoa_fltrnds.inc"
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if (ndig < 0)
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ndig = 0;
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if (bufsize < (size_t)(ndig + 10))
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return 0;
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L = (ULong*)V;
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sign = L[3] & 0x80000000L;
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bits[3] = L[3] & 0xffff;
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bits[2] = L[2];
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bits[1] = L[1];
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bits[0] = L[0];
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b = buf;
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if ( (ex = (L[3] & 0x7fff0000L) >> 16) !=0) {
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if (ex == 0x7fff) {
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/* Infinity or NaN */
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if (nik < 0 || nik > 35)
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nik = 0;
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if (bits[0] | bits[1] | bits[2] | bits[3]) {
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if (sign && nik < 18)
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*b++ = '-';
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b = strcpy(b, __gdtoa_NanName[nik%3]);
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if (nik > 5 && (nik < 12
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|| bits[0] != __gdtoa_NanDflt_Q[0]
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|| bits[1] != __gdtoa_NanDflt_Q[1]
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|| bits[2] != __gdtoa_NanDflt_Q[2]
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|| (bits[2] ^ __gdtoa_NanDflt_Q[2]) & 0xffff))
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b = __gdtoa_add_nanbits(b, bufsize - (b-buf), bits, 4);
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}
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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 = strcpy(b, __gdtoa_InfName[nik%6]);
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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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bits[3] |= 0x10000;
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}
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else if (bits[0] | bits[1] | bits[2] | bits[3]) {
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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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if (sign)
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*b++ = '-';
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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 + 112;
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mode = 2;
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if (ndig <= 0) {
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if (bufsize < 48)
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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 __gdtoa_g__fmt(buf, s, se, decpt, sign, bufsize);
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}
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