blob: 21b22ee92801733e91c3f5adfe50d5c14c0bd05e (
plain)
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
|
/* int iswide = (sizeof(*nptr) == sizeof(wchar_t)); */
void *start = (void*)nptr;
int sign = 0;
int overflow = 0;
/* skip leading whitespace */
while (isspace(*nptr)) {
nptr++;
}
/* get sign, if any */
if (*nptr == '+') {
sign = 1;
nptr++;
} else if (*nptr == '-') {
sign = -1;
nptr++;
}
/* fail if sign is negative but we are doing unsigned conversion */
if (min == 0 && sign == -1) {
if (endptr) {
*endptr = start;
}
return 0;
} else if (sign == 0) {
sign = 1;
}
/* determine base */
if (base == 0) {
if (nptr[0] == '0') {
if (nptr[1] == 'x' || nptr[1] == 'X') {
base = 16;
} else {
base = 8;
}
} else {
base = 10;
}
}
/* verify valid base */
if (base < 2 || base > 36) {
if (endptr) {
*endptr = start;
}
return 0;
}
/* skip leading 0x if appropriate */
if (base == 16 && nptr[0] == '0' && (nptr[1] == 'x' || nptr[1] == 'X')) {
nptr += 2;
}
while (*nptr) {
int n = 0;
/* int c = iswide ? wctomb(*nptr) : *nptr; */
switch (*nptr) {
case '0': n = 0; break;
case '1': n = 1; break;
case '2': n = 2; break;
case '3': n = 3; break;
case '4': n = 4; break;
case '5': n = 5; break;
case '6': n = 6; break;
case '7': n = 7; break;
case '8': n = 8; break;
case '9': n = 9; break;
case 'a': case 'A': n = 0xa; break;
case 'b': case 'B': n = 0xb; break;
case 'c': case 'C': n = 0xc; break;
case 'd': case 'D': n = 0xd; break;
case 'e': case 'E': n = 0xe; break;
case 'f': case 'F': n = 0xf; break;
case 'g': case 'G': n = 0x10; break;
case 'h': case 'H': n = 0x11; break;
case 'i': case 'I': n = 0x12; break;
case 'j': case 'J': n = 0x13; break;
case 'k': case 'K': n = 0x14; break;
case 'l': case 'L': n = 0x15; break;
case 'm': case 'M': n = 0x16; break;
case 'n': case 'N': n = 0x17; break;
case 'o': case 'O': n = 0x18; break;
case 'p': case 'P': n = 0x19; break;
case 'q': case 'Q': n = 0x1a; break;
case 'r': case 'R': n = 0x1b; break;
case 's': case 'S': n = 0x1c; break;
case 't': case 'T': n = 0x1d; break;
case 'u': case 'U': n = 0x1e; break;
case 'v': case 'V': n = 0x1f; break;
case 'w': case 'W': n = 0x20; break;
case 'x': case 'X': n = 0x21; break;
case 'y': case 'Y': n = 0x22; break;
case 'z': case 'Z': n = 0x23; break;
default: n = -1; break;
}
if (n >= base || n < 0) {
if (endptr) {
*endptr = (void*)nptr;
}
break;
}
if (ret > max / base) {
overflow = 1;
} else {
ret = (ret * base) + n;
}
nptr++;
}
if (endptr && (*endptr == NULL)) {
*endptr = (void*)nptr;
}
if (overflow) {
ret = (sign == 1) ? max : min;
} else {
ret *= sign;
}
|
