text: /*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
  │vi: set et ft=c ts=8 tw=8 fenc=utf-8                                       :vi│
  ╚──────────────────────────────────────────────────────────────────────────────╝
  │                                                                              │
  │  The author of this software is David M. Gay.                                │
  │  Please send bug reports to David M. Gay <dmg@acm.org>                       │
  │                          or Justine Tunney <jtunney@gmail.com>               │
  │                                                                              │
  │  Copyright (C) 1998, 1999 by Lucent Technologies                             │
  │  All Rights Reserved                                                         │
  │                                                                              │
  │  Permission to use, copy, modify, and distribute this software and           │
  │  its documentation for any purpose and without fee is hereby                 │
  │  granted, provided that the above copyright notice appear in all             │
  │  copies and that both that the copyright notice and this                     │
  │  permission notice and warranty disclaimer appear in supporting              │
  │  documentation, and that the name of Lucent or any of its entities           │
  │  not be used in advertising or publicity pertaining to                       │
  │  distribution of the software without specific, written prior                │
  │  permission.                                                                 │
  │                                                                              │
  │  LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,               │
  │  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.            │
  │  IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY           │
  │  SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES                   │
  │  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER             │
  │  IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,              │
  │  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF              │
  │  THIS SOFTWARE.                                                              │
  │                                                                              │
  ╚─────────────────────────────────────────────────────────────────────────────*/
  #include "third_party/gdtoa/gdtoa.internal.h"
  /* clang-format off */
  
  extern UShort __gdtoa_NanDflt_ldus[5];
  
  char*
  g_xfmt_p(char *buf, void *V, int ndig, size_t bufsize, int nik)
  {
  	static const FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0, Int_max };
  	char *b, *s, *se;
  	ULong bits[2], sign;
  	UShort *L;
  	int decpt, ex, i, mode;
  #include "third_party/gdtoa/gdtoa_fltrnds.inc"
  	if (ndig < 0)
  		ndig = 0;
  	if (bufsize < (size_t)(ndig + 10))
  		return 0;
  	L = (UShort *)V;
  	sign = L[4] & 0x8000;
  	bits[1] = ((ULong)L[3] << 16) | L[2];
  	bits[0] = ((ULong)L[1] << 16) | L[0];
  	if ( (ex = L[4] & 0x7fff) !=0) {
  		if (ex == 0x7fff) {
  			/* Infinity or NaN */
  			if (nik < 0 || nik > 35)
  				nik = 0;
  			if (!bits[0] && bits[1]== 0x80000000) {
  				b = buf;
  				if (sign)
  					*b++ = '-';
  				b = stpcpy(b, InfName[nik%6]);
  			}
  			else {
  				b = buf;
  				if (sign && nik < 18)
  					*b++ = '-';
  				b = stpcpy(b, NanName[nik%3]);
  				if (nik > 5 && (nik < 12
  						|| L[3] != __gdtoa_NanDflt_ldus[3]
  						|| L[2] != __gdtoa_NanDflt_ldus[2]
  						|| L[1] != __gdtoa_NanDflt_ldus[1]
  						|| L[0] != __gdtoa_NanDflt_ldus[0])) {
  					bits[1] &= 0x7fffffff;
  					b = add_nanbits(b, bufsize - (b-buf), bits, 2);
  				}
  			}
  			return b;
  		}
  		i = STRTOG_Normal;
  	}
  	else if (bits[0] | bits[1]) {
  		i = STRTOG_Denormal;
  		ex = 1;
  	}
  	else {
  		b = buf;
  		if (sign)
  			*b++ = '-';
  		*b++ = '0';
  		*b = 0;
  		return b;
  	}
  	ex -= 0x3fff + 63;
  	mode = 2;
  	if (ndig <= 0) {
  		if (bufsize < 32)
  			return 0;
  		mode = 0;
  	}
  	s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
  	return g__fmt(buf, s, se, decpt, sign, bufsize);
  }
  