ReactOS  0.4.14-dev-1112-g2b067d6
wcstoul.c File Reference
#include <precomp.h>
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Functions

unsigned long CDECL wcstoul (const wchar_t *nptr, wchar_t **endptr, int base)
 

Function Documentation

◆ wcstoul()

unsigned long CDECL wcstoul ( const wchar_t nptr,
wchar_t **  endptr,
int  base 
)

Definition at line 14 of file wcstoul.c.

15 {
16  const wchar_t *s = nptr;
17  unsigned long acc;
18  int c;
19  unsigned long cutoff;
20  int neg = 0, any, cutlim;
21 
22  /*
23  * See strtol for comments as to the logic used.
24  */
25  do {
26  c = *s++;
27  } while (iswctype(c, _SPACE));
28  if (c == L'-')
29  {
30  neg = 1;
31  c = *s++;
32  }
33  else if (c == L'+')
34  c = *s++;
35  if ((base == 0 || base == 16) &&
36  c == L'0' && (*s == L'x' || *s == L'X'))
37  {
38  c = s[1];
39  s += 2;
40  base = 16;
41  }
42  if (base == 0)
43  base = c == L'0' ? 8 : 10;
44  cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
45  cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
46  for (acc = 0, any = 0;; c = *s++)
47  {
48  if (iswctype(c, _DIGIT))
49  c -= L'0';
50  else if (iswctype(c, _ALPHA))
51  c -= iswctype(c, _UPPER) ? L'A' - 10 : L'a' - 10;
52  else
53  break;
54  if (c >= base)
55  break;
56  if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
57  any = -1;
58  else {
59  any = 1;
60  acc *= base;
61  acc += c;
62  }
63  }
64  if (any < 0)
65  {
66  acc = ULONG_MAX;
67  }
68  else if (neg)
69  acc = 0-acc;
70  if (endptr != 0)
71  *endptr = any ? (wchar_t *)((size_t)(s - 1)) : (wchar_t *)((size_t)nptr);
72  return acc;
73 }
#define _UPPER
Definition: ctype.h:65
GLuint base
Definition: 3dtext.c:35
#define _SPACE
Definition: ctype.h:68
unsigned short wchar_t
Definition: crtdefs.h:324
__kernel_size_t size_t
Definition: linux.h:237
const GLubyte * c
Definition: glext.h:8905
int __cdecl iswctype(wint_t wc, wctype_t wctypeFlags)
Definition: freeldr.c:97
static const WCHAR L[]
Definition: oid.c:1250
GLdouble s
Definition: gl.h:2039
#define _DIGIT
Definition: ctype.h:67
#define long
Definition: qsort.c:33
#define c
Definition: ke_i.h:80
#define _ALPHA
Definition: ctype.h:76
#define ULONG_MAX
Definition: limits.h:44