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
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package strconv
import "os"
func IntSize() uint {
siz := uint(8);
for 1<<siz != 0 {
siz *= 2
}
return siz
}
var intsize = IntSize();
// Convert decimal string to unsigned integer.
export func atoui64(s string) (i uint64, err *os.Error) {
// empty string bad
if len(s) == 0 {
return 0, os.EINVAL
}
// pick off zero
if s == "0" {
return 0, nil
}
// otherwise, leading zero bad:
// don't want to take something intended as octal.
if s[0] == '0' {
return 0, os.EINVAL
}
// parse number
n := uint64(0);
for i := 0; i < len(s); i++ {
if s[i] < '0' || s[i] > '9' {
return 0, os.EINVAL
}
if n > (1<<64)/10 {
return 1<<64-1, os.ERANGE
}
n = n*10;
d := uint64(s[i] - '0');
if n+d < n {
return 1<<64-1, os.ERANGE
}
n += d;
}
return n, nil
}
// Convert decimal string to integer.
export func atoi64(s string) (i int64, err *os.Error) {
// empty string bad
if len(s) == 0 {
return 0, os.EINVAL
}
// pick off leading sign
neg := false;
if s[0] == '+' {
s = s[1:len(s)]
} else if s[0] == '-' {
neg = true;
s = s[1:len(s)]
}
var un uint64;
un, err = atoui64(s);
if err != nil && err != os.ERANGE {
return 0, err
}
if !neg && un >= 1<<63 {
return 1<<63-1, os.ERANGE
}
if neg && un > 1<<63 {
return -1<<63, os.ERANGE
}
n := int64(un);
if neg {
n = -n
}
return n, nil
}
export func atoui(s string) (i uint, err *os.Error) {
i1, e1 := atoui64(s);
if e1 != nil && e1 != os.ERANGE {
return 0, e1
}
i = uint(i1);
if uint64(i) != i1 {
// TODO: return uint(^0), os.ERANGE.
i1 = 1<<64-1;
return uint(i1), os.ERANGE
}
return i, nil
}
export func atoi(s string) (i int, err *os.Error) {
i1, e1 := atoi64(s);
if e1 != nil && e1 != os.ERANGE {
return 0, e1
}
i = int(i1);
if int64(i) != i1 {
if i1 < 0 {
return -1<<(intsize-1), os.ERANGE
}
return 1<<(intsize-1) - 1, os.ERANGE
}
return i, nil
}
|
