1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/* @(#)fconv.c 1.12 98/08/18 Copyright 1985 J. Schilling */
/*
* Convert floating point numbers to strings for format.c
* Should rather use the MT-safe routines [efg]convert()
*
* Copyright (c) 1985 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h> /* <- may define NO_FLOATINGPOINT */
#ifndef NO_FLOATINGPOINT
#include <stdxlib.h>
#include <standard.h>
#include <strdefs.h>
#if !defined(HAVE_STDLIB_H) || defined(HAVE_DTOA)
extern char *ecvt __PR((double, int, int *, int *));
extern char *fcvt __PR((double, int, int *, int *));
#endif
#ifdef hpux
#undef BSD4_2
#endif
#ifdef SVR4
#include <ieeefp.h>
#define isnan isnand
#define isinf !finite
#endif
#include <math.h>
#ifdef HAVE_DTOA /* 4.4BSD floating point implementation */
#include "cvt.c"
#endif /* HAVE_DTOA */
static char _nan[] = "(NaN)";
static char _inf[] = "(Infinity)";
static int _ferr __PR((char *, double));
#define abs(i) ((i) < 0 ? -(i) : (i))
EXPORT int
ftoes(s, val, fieldwidth, ndigits)
register char *s;
double val;
register int fieldwidth;
register int ndigits;
{
register char *b;
register char *rs;
register int len;
register int rdecpt;
int decpt;
int sign;
if ((len = _ferr(s, val)) > 0)
return len;
rs = s;
#ifdef V7_FLOATSTYLE
b = ecvt(val, ndigits, &decpt, &sign);
rdecpt = decpt;
#else
b = ecvt(val, ndigits+1, &decpt, &sign);
rdecpt = decpt-1;
#endif
len = ndigits + 6; /* Punkt e +/- nnn */
if (sign)
len++;
if (fieldwidth > len)
while (fieldwidth-- > len)
*rs++ = ' ';
if (sign)
*rs++ = '-';
#ifndef V7_FLOATSTYLE
if (*b)
*rs++ = *b++;
#endif
*rs++ = '.';
while (*b && ndigits-- > 0)
*rs++ = *b++;
*rs++ = 'e';
*rs++ = rdecpt >= 0 ? '+' : '-';
rdecpt = abs(rdecpt);
#ifndef V7_FLOATSTYLE
if (rdecpt >= 100)
#endif
{
*rs++ = rdecpt / 100 + '0';
rdecpt %= 100;
}
*rs++ = rdecpt / 10 + '0';
*rs++ = rdecpt % 10 + '0';
*rs = '\0';
return rs - s;
}
EXPORT int
ftofs(s, val, fieldwidth, ndigits)
register char *s;
double val;
register int fieldwidth;
register int ndigits;
{
register char *b;
register char *rs;
register int len;
register int rdecpt;
int decpt;
int sign;
if ((len = _ferr(s, val)) > 0)
return len;
rs = s;
b = fcvt(val, ndigits, &decpt, &sign);
rdecpt = decpt;
len = rdecpt + ndigits + 1;
if (rdecpt < 0)
len -= rdecpt;
if (sign)
len++;
if (fieldwidth > len)
while (fieldwidth-- > len)
*rs++ = ' ';
if (sign)
*rs++ = '-';
if (rdecpt > 0) {
len = rdecpt;
while (*b && len-- > 0)
*rs++ = *b++;
}
#ifndef V7_FLOATSTYLE
else {
*rs++ = '0';
}
#endif
*rs++ = '.';
if (rdecpt < 0) {
len = rdecpt;
while (len++ < 0 && ndigits-- > 0)
*rs++ = '0';
}
while (*b && ndigits-- > 0)
*rs++ = *b++;
*rs = '\0';
return rs - s;
}
LOCAL int
_ferr(s, val)
char *s;
double val;
{
#if defined(BSD4_2) || defined(SVR4)
if (isnan(val)){
strcpy(s, _nan);
return (sizeof (_nan) - 1);
}
/*
* Check first for NaN because finite() will return 1 on Nan too.
*/
if (isinf(val)){
strcpy(s, _inf);
return (sizeof (_inf) - 1);
}
#endif
return 0;
}
#endif /* NO_FLOATINGPOINT */
|
