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#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
54char *__g_xfmt (char *buf, void *V, int ndig, size_t bufsize)
55{
56 static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0, Int_max };
57 char *b, *s, *se;
58 ULong bits[2], sign;
59 UShort *L;
60 int decpt, ex, i, mode;
61#if defined(__MINGW32__) || defined(__MINGW64__)
62 int fptype = __fpclassifyl (*(long double*) V);
63#endif /* MinGW */
64#ifdef Honor_FLT_ROUNDS
65#include "gdtoa_fltrnds.h"
66#else
67#define fpi &fpi0
68#endif
69
70 if (ndig < 0)
71 ndig = 0;
72 if (bufsize < (size_t)(ndig + 10))
73 return 0;
74
75 L = (UShort *)V;
76 sign = L[_0] & 0x8000;
77 ex = L[_0] & 0x7fff;
78 bits[1] = (L[_1] << 16) | L[_2];
79 bits[0] = (L[_3] << 16) | L[_4];
80
81#if defined(__MINGW32__) || defined(__MINGW64__)
82 if (fptype & FP_NAN) {
83 /* NaN or Inf */
84 if (fptype & FP_NORMAL) {
85 b = buf;
86 *b++ = sign ? '-': '+';
87 strncpy (b, "Infinity", ndig ? ndig : 8);
88 return (buf + strlen (buf));
89 }
90 strncpy (buf, "NaN", ndig ? ndig : 3);
91 return (buf + strlen (buf));
92 }
93 else if (fptype & FP_NORMAL) {
94 /* Normal or subnormal */
95 if (fptype & FP_ZERO) {
96 i = STRTOG_Denormal;
97 ex = 1;
98 }
99 else
100 i = STRTOG_Normal;
101 }
102#else
103 if (ex != 0) {
104 if (ex == 0x7fff) {
105 /* Infinity or NaN */
106 if (!bits[0] && bits[1]== 0x80000000) {
107 b = buf;
108 if (sign)
109 *b++ = '-';
110 b = strcp(b, "Infinity");
111 }
112 else
113 b = strcp(buf, "NaN");
114 return b;
115 }
116 i = STRTOG_Normal;
117 }
118 else if (bits[0] | bits[1]) {
119 i = STRTOG_Denormal;
120 ex = 1;
121 }
122#endif
123 else {
124 /* i = STRTOG_Zero; */
125 b = buf;
126#ifndef IGNORE_ZERO_SIGN
127 if (sign)
128 *b++ = '-';
129#endif
130 *b++ = '0';
131 *b = 0;
132 return b;
133 }
134 ex -= 0x3fff + 63;
135 mode = 2;
136 if (ndig <= 0) {
137 if (bufsize < 32)
138 return 0;
139 mode = 0;
140 }
141 s = __gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
142 return __g__fmt(buf, s, se, decpt, sign, bufsize);
143}