1/**************************************************************** 2 3The author of this software is David M. Gay. 4 5Copyright (C) 1998 by Lucent Technologies 6All Rights Reserved 7 8Permission to use, copy, modify, and distribute this software and 9its documentation for any purpose and without fee is hereby 10granted, provided that the above copyright notice appear in all 11copies and that both that the copyright notice and this 12permission notice and warranty disclaimer appear in supporting 13documentation, and that the name of Lucent or any of its entities 14not be used in advertising or publicity pertaining to 15distribution of the software without specific, written prior 16permission. 17 18LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25THIS SOFTWARE. 26 27****************************************************************/ 28 29/* Please send bug reports to David M. Gay (dmg at acm dot org, 30 * with " at " changed at "@" and " dot " changed to "."). */ 31 32#include "gdtoaimp.h" 33 34 char* 35#ifdef KR_headers 36g_dfmt(buf, d, ndig, bufsize) char *buf; double *d; int ndig; size_t bufsize; 37#else 38g_dfmt(char *buf, double *d, int ndig, size_t bufsize) 39#endif 40{ 41 static FPI fpi0 = { 53, 1-1023-53+1, 2046-1023-53+1, 1, 0 }; 42 char *b, *s, *se; 43 ULong bits[2], *L, sign; 44 int decpt, ex, i, mode; 45#ifdef Honor_FLT_ROUNDS 46#include "gdtoa_fltrnds.h" 47#else 48#define fpi &fpi0 49#endif 50 51 if (ndig < 0) 52 ndig = 0; 53 if (bufsize < ndig + 10) 54 return 0; 55 56 L = (ULong*)d; 57 sign = L[_0] & 0x80000000L; 58 if ((L[_0] & 0x7ff00000) == 0x7ff00000) { 59 /* Infinity or NaN */ 60 if (bufsize < 10) 61 return 0; 62 if (L[_0] & 0xfffff || L[_1]) { 63 return strcp(buf, "NaN"); 64 } 65 b = buf; 66 if (sign) 67 *b++ = '-'; 68 return strcp(b, "Infinity"); 69 } 70 if (L[_1] == 0 && (L[_0] ^ sign) == 0 /*d == 0.*/) { 71 b = buf; 72#ifndef IGNORE_ZERO_SIGN 73 if (L[_0] & 0x80000000L) 74 *b++ = '-'; 75#endif 76 *b++ = '0'; 77 *b = 0; 78 return b; 79 } 80 bits[0] = L[_1]; 81 bits[1] = L[_0] & 0xfffff; 82 if ( (ex = (L[_0] >> 20) & 0x7ff) !=0) 83 bits[1] |= 0x100000; 84 else 85 ex = 1; 86 ex -= 0x3ff + 52; 87 mode = 2; 88 if (ndig <= 0) 89 mode = 0; 90 i = STRTOG_Normal; 91 if (sign) 92 i = STRTOG_Normal | STRTOG_Neg; 93 s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se); 94 return g__fmt(buf, s, se, decpt, sign, bufsize); 95 } 96