wcstoul(), wcstoull()

Convert a wide-character string into an unsigned long integer

Synopsis:

#include <wchar.h>

unsigned long wcstoul( const wchar_t * ptr,
                       wchar_t ** endptr,
                       int base );

unsigned long long wcstoull( const wchar_t * ptr,
                             wchar_t ** endptr,
                             int base );

Arguments:

ptr

A pointer to the string to parse.

endptr

If this argument isn't NULL, the function stores in it a pointer to the first unrecognized character found in the string.

base

The base of the number being parsed:

If base is zero, the first characters after the optional sign determine the base used for the conversion. If the first characters are 0x or 0X the digits are treated as hexadecimal. If the first character is 0, the digits are treated as octal. Otherwise, the digits are treated as decimal.
If base isn't zero, it must have a value between 2 and 36. The letters a–z and A–Z represent the values 10 through 35. Only those letters whose designated values are less than base are permitted. If the value of base is 16, the characters 0x or 0X may optionally precede the sequence of letters and digits.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

These functions convert a wide-character string into a number:

wcstoul() converts the string into an unsigned long
wcstoull() converts it into a unsigned long long

These functions recognize a string containing optional white space, followed by a sequence of digits and letters. The conversion ends at the first unrecognized character. A pointer to that character is stored in the object endptr points to, if endptr isn't NULL.

If base is zero, the first characters determine the base used for the conversion. If the first characters are 0x or 0X the digits are treated as hexadecimal. If the first character is 0, the digits are treated as octal. Otherwise, the digits are treated as decimal.

If base isn't zero, it must have a value between 2 and 36. The letters a–z and A–Z represent the values 10 through 35. Only those letters whose designated values are less than base are permitted. If the value of base is 16, the characters 0x or 0X may optionally precede the sequence of letters and digits.

Returns:

The converted value.

If the correct value causes an overflow, the returned value is ULONG_MAX or ULLONG_MAX, depending on the function, and errno is set to ERANGE. If base is out of range, zero is returned and errno is set to EINVAL.

Errors:

ERANGE: The value isn't representable.
EINVAL: The value for base isn't supported, or no conversion could be performed.

Classification:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes