1 /**************************************************************** 2 3 The author of this software is David M. Gay. 4 5 Copyright (C) 1998 by Lucent Technologies 6 All Rights Reserved 7 8 Permission to use, copy, modify, and distribute this software and 9 its documentation for any purpose and without fee is hereby 10 granted, provided that the above copyright notice appear in all 11 copies and that both that the copyright notice and this 12 permission notice and warranty disclaimer appear in supporting 13 documentation, and that the name of Lucent or any of its entities 14 not be used in advertising or publicity pertaining to 15 distribution of the software without specific, written prior 16 permission. 17 18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25 THIS 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 #undef _0 35 #undef _1 36 37 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */ 38 39 #ifdef IEEE_MC68k 40 #define _0 0 41 #define _1 1 42 #define _2 2 43 #define _3 3 44 #define _4 4 45 #endif 46 #ifdef IEEE_8087 47 #define _0 4 48 #define _1 3 49 #define _2 2 50 #define _3 1 51 #define _4 0 52 #endif 53 54 char* 55 #ifdef KR_headers 56 g_xfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; unsigned bufsize; 57 #else 58 g_xfmt(char *buf, void *V, int ndig, unsigned bufsize) 59 #endif 60 { 61 static FPI fpi = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 }; 62 char *b, *s, *se; 63 ULong bits[2], sign; 64 UShort *L; 65 int decpt, ex, i, mode; 66 67 if (ndig < 0) 68 ndig = 0; 69 if (bufsize < ndig + 10) 70 return 0; 71 72 L = (UShort *)V; 73 sign = L[_0] & 0x8000; 74 bits[1] = (L[_1] << 16) | L[_2]; 75 bits[0] = (L[_3] << 16) | L[_4]; 76 if ( (ex = L[_0] & 0x7fff) !=0) { 77 if (ex == 0x7fff) { 78 /* Infinity or NaN */ 79 if (bits[0] | bits[1]) 80 b = strcp(buf, "NaN"); 81 else { 82 b = buf; 83 if (sign) 84 *b++ = '-'; 85 b = strcp(b, "Infinity"); 86 } 87 return b; 88 } 89 i = STRTOG_Normal; 90 } 91 else if (bits[0] | bits[1]) { 92 i = STRTOG_Denormal; 93 ex = 1; 94 } 95 else { 96 b = buf; 97 #ifndef IGNORE_ZERO_SIGN 98 if (sign) 99 *b++ = '-'; 100 #endif 101 *b++ = '0'; 102 *b = 0; 103 return b; 104 } 105 ex -= 0x3fff + 63; 106 mode = 2; 107 if (ndig <= 0) { 108 if (bufsize < 32) 109 return 0; 110 mode = 0; 111 } 112 s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se); 113 return g__fmt(buf, s, se, decpt, sign); 114 } 115