ReactOS 0.4.15-dev-7674-gc0b4db1
strtoull.c
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1#include <precomp.h>
2
3unsigned long long
5strtoull(const char *nptr, char **endptr, int base)
6{
7 const char *s = nptr;
8 unsigned long long acc;
9 int c;
10 unsigned long long cutoff;
11 int neg = 0, any, cutlim;
12
13 /*
14 * See strtol for comments as to the logic used.
15 */
16 do {
17 c = *s++;
18 } while (isspace(c));
19 if (c == '-')
20 {
21 neg = 1;
22 c = *s++;
23 }
24 else if (c == '+')
25 c = *s++;
26 if ((base == 0 || base == 16) &&
27 c == '0' && (*s == 'x' || *s == 'X'))
28 {
29 c = s[1];
30 s += 2;
31 base = 16;
32 }
33 if (base == 0)
34 base = c == '0' ? 8 : 10;
35 cutoff = (unsigned long long)ULLONG_MAX / (unsigned long long)base;
36 cutlim = (unsigned long long)ULLONG_MAX % (unsigned long long)base;
37 for (acc = 0, any = 0;; c = *s++)
38 {
39 if (isdigit(c))
40 c -= '0';
41 else if (isalpha(c))
42 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
43 else
44 break;
45 if (c >= base)
46 break;
47 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
48 any = -1;
49 else {
50 any = 1;
51 acc *= base;
52 acc += c;
53 }
54 }
55 if (any < 0)
56 {
57 acc = ULLONG_MAX;
58#ifndef _LIBCNT_
60#endif
61 }
62 else if (neg)
63 acc = 0-acc;
64 if (endptr != 0)
65 *endptr = any ? (char *)((size_t)(s - 1)) : (char *)((size_t)nptr);
66 return acc;
67}
#define isspace(c)
Definition: acclib.h:69
#define isalpha(c)
Definition: acclib.h:74
#define isdigit(c)
Definition: acclib.h:68
#define ERANGE
Definition: acclib.h:92
#define isupper(c)
Definition: acclib.h:71
#define CDECL
Definition: compat.h:29
GLdouble s
Definition: gl.h:2039
const GLubyte * c
Definition: glext.h:8905
#define ULLONG_MAX
Definition: limits.h:47
#define c
Definition: ke_i.h:80
#define long
Definition: qsort.c:33
errno_t __cdecl _set_errno(_In_ int _Value)
#define strtoull
Definition: stabs.c:58