1 /**************************************************************** 2 3 The author of this software is David M. Gay. 4 5 Copyright (C) 1998, 2000 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 #endif 45 #ifdef IEEE_8087 46 #define _0 3 47 #define _1 2 48 #define _2 1 49 #define _3 0 50 #endif 51 52 char* 53 #ifdef KR_headers 54 g_Qfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; size_t bufsize; 55 #else 56 g_Qfmt(char *buf, void *V, int ndig, size_t bufsize) 57 #endif 58 { 59 static FPI fpi0 = { 113, 1-16383-113+1, 32766 - 16383 - 113 + 1, 1, 0 }; 60 char *b, *s, *se; 61 ULong bits[4], *L, sign; 62 int decpt, ex, i, mode; 63 #ifdef Honor_FLT_ROUNDS 64 #include "gdtoa_fltrnds.h" 65 #else 66 #define fpi &fpi0 67 #endif 68 69 if (ndig < 0) 70 ndig = 0; 71 if (bufsize < ndig + 10) 72 return 0; 73 74 L = (ULong*)V; 75 sign = L[_0] & 0x80000000L; 76 bits[3] = L[_0] & 0xffff; 77 bits[2] = L[_1]; 78 bits[1] = L[_2]; 79 bits[0] = L[_3]; 80 b = buf; 81 if ( (ex = (L[_0] & 0x7fff0000L) >> 16) !=0) { 82 if (ex == 0x7fff) { 83 /* Infinity or NaN */ 84 if (bits[0] | bits[1] | bits[2] | bits[3]) 85 b = strcp(b, "NaN"); 86 else { 87 b = buf; 88 if (sign) 89 *b++ = '-'; 90 b = strcp(b, "Infinity"); 91 } 92 return b; 93 } 94 i = STRTOG_Normal; 95 bits[3] |= 0x10000; 96 } 97 else if (bits[0] | bits[1] | bits[2] | bits[3]) { 98 i = STRTOG_Denormal; 99 ex = 1; 100 } 101 else { 102 #ifndef IGNORE_ZERO_SIGN 103 if (sign) 104 *b++ = '-'; 105 #endif 106 *b++ = '0'; 107 *b = 0; 108 return b; 109 } 110 ex -= 0x3fff + 112; 111 mode = 2; 112 if (ndig <= 0) { 113 if (bufsize < 48) 114 return 0; 115 mode = 0; 116 } 117 s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se); 118 return g__fmt(buf, s, se, decpt, sign, bufsize); 119 } 120