1 /* $NetBSD: g_Qfmt.c,v 1.3 2008/03/21 23:13:48 christos Exp $ */ 2 3 /**************************************************************** 4 5 The author of this software is David M. Gay. 6 7 Copyright (C) 1998, 2000 by Lucent Technologies 8 All Rights Reserved 9 10 Permission to use, copy, modify, and distribute this software and 11 its documentation for any purpose and without fee is hereby 12 granted, provided that the above copyright notice appear in all 13 copies and that both that the copyright notice and this 14 permission notice and warranty disclaimer appear in supporting 15 documentation, and that the name of Lucent or any of its entities 16 not be used in advertising or publicity pertaining to 17 distribution of the software without specific, written prior 18 permission. 19 20 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 21 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 22 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 23 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 24 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 25 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 26 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 27 THIS 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 #endif 47 #ifdef IEEE_LITTLE_ENDIAN 48 #define _0 3 49 #define _1 2 50 #define _2 1 51 #define _3 0 52 #endif 53 54 char* 55 #ifdef KR_headers 56 g_Qfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; unsigned bufsize; 57 #else 58 g_Qfmt(char *buf, void *V, int ndig, unsigned bufsize) 59 #endif 60 { 61 static FPI fpi = { 113, 1-16383-113+1, 32766 - 16383 - 113 + 1, 1, 0 }; 62 char *b, *s, *se; 63 ULong bits[4], *L, sign; 64 int decpt, ex, i, mode; 65 66 if (ndig < 0) 67 ndig = 0; 68 if (bufsize < ndig + 10) 69 return 0; 70 71 L = (ULong*)V; 72 sign = L[_0] & 0x80000000L; 73 bits[3] = L[_0] & 0xffff; 74 bits[2] = L[_1]; 75 bits[1] = L[_2]; 76 bits[0] = L[_3]; 77 b = buf; 78 if ( (ex = (L[_0] & 0x7fff0000L) >> 16) !=0) { 79 if (ex == 0x7fff) { 80 /* Infinity or NaN */ 81 if (bits[0] | bits[1] | bits[2] | bits[3]) 82 b = strcp(b, "NaN"); 83 else { 84 b = buf; 85 if (sign) 86 *b++ = '-'; 87 b = strcp(b, "Infinity"); 88 } 89 return b; 90 } 91 i = STRTOG_Normal; 92 bits[3] |= 0x10000; 93 } 94 else if (bits[0] | bits[1] | bits[2] | bits[3]) { 95 i = STRTOG_Denormal; 96 ex = 1; 97 } 98 else { 99 #ifndef IGNORE_ZERO_SIGN 100 if (sign) 101 *b++ = '-'; 102 #endif 103 *b++ = '0'; 104 *b = 0; 105 return b; 106 } 107 ex -= 0x3fff + 112; 108 mode = 2; 109 if (ndig <= 0) { 110 if (bufsize < 48) 111 return 0; 112 mode = 0; 113 } 114 s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se); 115 if (s == NULL) 116 return NULL; 117 return g__fmt(buf, s, se, decpt, sign); 118 } 119