1112158Sdas/**************************************************************** 2112158Sdas 3112158SdasThe author of this software is David M. Gay. 4112158Sdas 5112158SdasCopyright (C) 1998 by Lucent Technologies 6112158SdasAll Rights Reserved 7112158Sdas 8112158SdasPermission to use, copy, modify, and distribute this software and 9112158Sdasits documentation for any purpose and without fee is hereby 10112158Sdasgranted, provided that the above copyright notice appear in all 11112158Sdascopies and that both that the copyright notice and this 12112158Sdaspermission notice and warranty disclaimer appear in supporting 13112158Sdasdocumentation, and that the name of Lucent or any of its entities 14112158Sdasnot be used in advertising or publicity pertaining to 15112158Sdasdistribution of the software without specific, written prior 16112158Sdaspermission. 17112158Sdas 18112158SdasLUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19112158SdasINCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20112158SdasIN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21112158SdasSPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22112158SdasWHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23112158SdasIN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24112158SdasARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25112158SdasTHIS SOFTWARE. 26112158Sdas 27112158Sdas****************************************************************/ 28112158Sdas 29165743Sdas/* Please send bug reports to David M. Gay (dmg at acm dot org, 30165743Sdas * with " at " changed at "@" and " dot " changed to "."). */ 31112158Sdas 32112158Sdas#include "gdtoaimp.h" 33112158Sdas 34112158Sdas#undef _0 35112158Sdas#undef _1 36112158Sdas 37112158Sdas/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */ 38112158Sdas 39112158Sdas#ifdef IEEE_MC68k 40112158Sdas#define _0 0 41112158Sdas#define _1 1 42112158Sdas#define _2 2 43112158Sdas#define _3 3 44112158Sdas#define _4 4 45112158Sdas#endif 46112158Sdas#ifdef IEEE_8087 47112158Sdas#define _0 4 48112158Sdas#define _1 3 49112158Sdas#define _2 2 50112158Sdas#define _3 1 51112158Sdas#define _4 0 52112158Sdas#endif 53112158Sdas 54112158Sdas char* 55112158Sdas#ifdef KR_headers 56187808Sdasg_xfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; size_t bufsize; 57112158Sdas#else 58187808Sdasg_xfmt(char *buf, void *V, int ndig, size_t bufsize) 59112158Sdas#endif 60112158Sdas{ 61187808Sdas static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 }; 62112158Sdas char *b, *s, *se; 63112158Sdas ULong bits[2], sign; 64112158Sdas UShort *L; 65112158Sdas int decpt, ex, i, mode; 66187808Sdas#ifdef Honor_FLT_ROUNDS 67187808Sdas#include "gdtoa_fltrnds.h" 68187808Sdas#else 69187808Sdas#define fpi &fpi0 70187808Sdas#endif 71112158Sdas 72112158Sdas if (ndig < 0) 73112158Sdas ndig = 0; 74112158Sdas if (bufsize < ndig + 10) 75112158Sdas return 0; 76112158Sdas 77112158Sdas L = (UShort *)V; 78112158Sdas sign = L[_0] & 0x8000; 79112158Sdas bits[1] = (L[_1] << 16) | L[_2]; 80112158Sdas bits[0] = (L[_3] << 16) | L[_4]; 81112158Sdas if ( (ex = L[_0] & 0x7fff) !=0) { 82112158Sdas if (ex == 0x7fff) { 83112158Sdas /* Infinity or NaN */ 84112158Sdas if (bits[0] | bits[1]) 85112158Sdas b = strcp(buf, "NaN"); 86112158Sdas else { 87112158Sdas b = buf; 88112158Sdas if (sign) 89112158Sdas *b++ = '-'; 90112158Sdas b = strcp(b, "Infinity"); 91112158Sdas } 92112158Sdas return b; 93112158Sdas } 94112158Sdas i = STRTOG_Normal; 95112158Sdas } 96112158Sdas else if (bits[0] | bits[1]) { 97112158Sdas i = STRTOG_Denormal; 98165743Sdas ex = 1; 99112158Sdas } 100112158Sdas else { 101112158Sdas b = buf; 102112158Sdas#ifndef IGNORE_ZERO_SIGN 103112158Sdas if (sign) 104112158Sdas *b++ = '-'; 105112158Sdas#endif 106112158Sdas *b++ = '0'; 107112158Sdas *b = 0; 108112158Sdas return b; 109112158Sdas } 110112158Sdas ex -= 0x3fff + 63; 111112158Sdas mode = 2; 112112158Sdas if (ndig <= 0) { 113112158Sdas if (bufsize < 32) 114112158Sdas return 0; 115112158Sdas mode = 0; 116112158Sdas } 117187808Sdas s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se); 118187808Sdas return g__fmt(buf, s, se, decpt, sign, bufsize); 119112158Sdas } 120