1/* $NetBSD: g_xfmt.c,v 1.5 2019/08/01 02:27:43 riastradh Exp $ */ 2 3/**************************************************************** 4 5The author of this software is David M. Gay. 6 7Copyright (C) 1998 by Lucent Technologies 8All Rights Reserved 9 10Permission to use, copy, modify, and distribute this software and 11its documentation for any purpose and without fee is hereby 12granted, provided that the above copyright notice appear in all 13copies and that both that the copyright notice and this 14permission notice and warranty disclaimer appear in supporting 15documentation, and that the name of Lucent or any of its entities 16not be used in advertising or publicity pertaining to 17distribution of the software without specific, written prior 18permission. 19 20LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 21INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 22IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 23SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 24WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 25IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 26ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 27THIS SOFTWARE. 28 29****************************************************************/ 30 31/* Please send bug reports to David M. Gay (dmg at acm dot org, 32 * with " at " changed at "@" and " dot " changed to "."). */ 33 34#include "gdtoaimp.h" 35 36#undef _0 37#undef _1 38 39/* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */ 40 41#ifdef IEEE_BIG_ENDIAN 42#define _0 0 43#define _1 1 44#define _2 2 45#define _3 3 46#define _4 4 47#endif 48#ifdef IEEE_LITTLE_ENDIAN 49#define _0 4 50#define _1 3 51#define _2 2 52#define _3 1 53#define _4 0 54#endif 55 56 char* 57#ifdef KR_headers 58g_xfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; size_t bufsize; 59#else 60g_xfmt(char *buf, void *V, int ndig, size_t bufsize) 61#endif 62{ 63 static CONST FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 }; 64 char *b, *s, *se; 65 ULong bits[2], sign; 66 UShort *L; 67 int decpt, ex, i, mode; 68#ifdef Honor_FLT_ROUNDS 69#include "gdtoa_fltrnds.h" 70#else 71#define fpi &fpi0 72#endif 73 74 if (ndig < 0) 75 ndig = 0; 76 if (bufsize < ndig + 10) 77 return 0; 78 79 L = (UShort *)V; 80 sign = L[_0] & 0x8000; 81 bits[1] = (L[_1] << 16) | L[_2]; 82 bits[0] = (L[_3] << 16) | L[_4]; 83 if ( (ex = L[_0] & 0x7fff) !=0) { 84 if (ex == 0x7fff) { 85 /* Infinity or NaN */ 86 if (bits[0] | bits[1]) 87 b = strcp(buf, "NaN"); 88 else { 89 b = buf; 90 if (sign) 91 *b++ = '-'; 92 b = strcp(b, "Infinity"); 93 } 94 return b; 95 } 96 i = STRTOG_Normal; 97 } 98 else if (bits[0] | bits[1]) { 99 i = STRTOG_Denormal; 100 ex = 1; 101 } 102 else { 103 b = buf; 104#ifndef IGNORE_ZERO_SIGN 105 if (sign) 106 *b++ = '-'; 107#endif 108 *b++ = '0'; 109 *b = 0; 110 return b; 111 } 112 ex -= 0x3fff + 63; 113 mode = 2; 114 if (ndig <= 0) { 115 if (bufsize < 32) 116 return 0; 117 mode = 0; 118 } 119 s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se); 120 if (s == NULL) 121 return NULL; 122 return g__fmt(buf, s, se, decpt, sign, bufsize); 123 } 124