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
184
185
186
187
188
189
|
/* @(#)cvt.c 1.1 98/07/19 Copyright 1998 J. Schilling */
/*
* Compatibility routines for 4.4BSD based C-libraries
* Neither __dtoa() nor [efg]cvt() are MT safe.
*
* Copyright (c) 1998 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 <stdxlib.h>
#include <utypes.h>
#include <standard.h>
extern char *__dtoa __PR((double value, int mode, int ndigit, int *decpt, int *sign, char **ep));
EXPORT char *ecvt __PR((double value, int ndigit, int *decpt, int *sign));
EXPORT char *fcvt __PR((double value, int ndigit, int *decpt, int *sign));
EXPORT char *gcvt __PR((double value, int ndigit, char *buf));
char *
ecvt(value, ndigit, decpt, sign)
double value;
int ndigit;
int *decpt;
int *sign;
{
static Uint bufsize;
static char *buf;
char *bufend;
char *ep;
char *bp = __dtoa(value, 2, ndigit, decpt, sign, &ep);
if (value == 0.0) {
/*
* Handle __dtoa()'s deviation from ecvt():
* 0.0 is converted to "0" instead of 'ndigit' zeroes.
* The string "0" is not allocated, so
* we need to allocate buffer to hold 'ndigit' zeroes.
*/
if (bufsize < ndigit + 1) {
if (buf != (char *)0)
free(buf);
bufsize = ndigit + 1;
buf = malloc(bufsize);
}
ep = bp = buf;
}
/*
* Fill up trailing zeroes suppressed by __dtoa()
* From an internal __dtoa() comment:
* Sufficient space is allocated to the return value
* to hold the suppressed trailing zeros.
*/
for (bufend = &bp[ndigit]; ep < bufend; )
*ep++ = '0';
*ep = '\0';
return (bp);
}
char *
fcvt(value, ndigit, decpt, sign)
double value;
int ndigit;
int *decpt;
int *sign;
{
static Uint bufsize;
static char *buf;
char *bufend;
char *ep;
char *bp = __dtoa(value, 3, ndigit, decpt, sign, &ep);
if (value == 0.0) {
/*
* Handle __dtoa()'s deviation from fcvt():
* 0.0 is converted to "0" instead of 'ndigit' zeroes.
* The string "0" is not allocated, so
* we need to allocate buffer to hold 'ndigit' zeroes.
*/
if (bufsize < ndigit + 1) {
if (buf != (char *)0)
free(buf);
bufsize = ndigit + 1;
buf = malloc(bufsize);
}
ep = bp = buf;
*decpt = 0;
}
/*
* Fill up trailing zeroes suppressed by __dtoa()
* From an internal __dtoa() comment:
* Sufficient space is allocated to the return value
* to hold the suppressed trailing zeros.
*/
for (bufend = &bp[*decpt + ndigit]; ep < bufend; )
*ep++ = '0';
*ep = '\0';
return (bp);
}
char *
gcvt(number, ndigit, buf)
double number;
int ndigit;
char *buf;
{
int sign;
int decpt;
register char *b;
register char *rs;
register int i;
b = ecvt(number, ndigit, &decpt, &sign);
rs = buf;
if (sign)
*rs++ = '-';
for (i = ndigit-1; i > 0 && b[i] == '0'; i--)
ndigit--;
#ifdef V7_FLOATSTYLE
if ((decpt >= 0 && decpt-ndigit > 4) ||
#else
if ((decpt >= 0 && decpt-ndigit > 0) ||
#endif
(decpt < 0 && decpt < -3)) { /* e-format */
decpt--;
*rs++ = *b++;
*rs++ = '.';
for (i = 1; i < ndigit; i++)
*rs++ = *b++;
*rs++ = 'e';
if (decpt < 0) {
decpt = -decpt;
*rs++ = '-';
} else {
*rs++ = '+';
}
if (decpt >= 100) {
*rs++ = decpt / 100 + '0';
decpt %= 100;
}
*rs++ = decpt / 10 + '0';
*rs++ = decpt % 10 + '0';
} else { /* f-format */
if (decpt <= 0) {
if (*b != '0') {
#ifndef V7_FLOATSTYLE
*rs++ = '0';
#endif
*rs++ = '.';
}
while (decpt < 0) {
decpt++;
*rs++ = '0';
}
}
for (i = 1; i <= ndigit; i++) {
*rs++ = *b++;
if (i == decpt)
*rs++ = '.';
}
if (ndigit < decpt) {
while (ndigit++ < decpt)
*rs++ = '0';
*rs++ = '.';
}
}
if (rs[-1] == '.')
rs--;
*rs = '\0';
return (buf);
}
|
