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WCSTOUL(P) WCSTOUL(P)
NAME
wcstoul, wcstoull - convert a wide-character string to an unsigned long
SYNOPSIS
#include <wchar.h>
unsigned long wcstoul(const wchar_t *restrict nptr,
wchar_t **restrict endptr, int base);
unsigned long long wcstoull(const wchar_t *restrict nptr,
wchar_t **restrict endptr, int base);
DESCRIPTION
The wcstoul() and wcstoull() functions shall convert the initial portion of the
wide-character string pointed to by nptr to unsigned long and unsigned long long
representation, respectively. First, they shall decompose the input wide-character
string into three parts:
1. An initial, possibly empty, sequence of white-space wide-character codes (as
specified by iswspace())
2. A subject sequence interpreted as an integer represented in some radix deter-
mined by the value of base
3. A final wide-character string of one or more unrecognized wide-character codes,
including the terminating null wide-character code of the input wide-character
string
Then they shall attempt to convert the subject sequence to an unsigned integer, and
return the result.
If base is 0, the expected form of the subject sequence is that of a decimal con-
stant, octal constant, or hexadecimal constant, any of which may be preceded by a
â€â€™+â€â€™ or â€â€™-â€â€™ sign. A decimal constant begins with a non-zero digit, and consists of a
sequence of decimal digits. An octal constant consists of the prefix â€â€™0â€â€™ optionally
followed by a sequence of the digits â€â€™0â€â€™ to â€â€™7â€â€™ only. A hexadecimal constant con-
sists of the prefix 0x or 0X followed by a sequence of the decimal digits and let-
ters â€â€™aâ€â€™ (or â€â€™Aâ€â€™ ) to â€â€™fâ€â€™ (or â€â€™Fâ€â€™ ) with values 10 to 15 respectively.
If the value of base is between 2 and 36, the expected form of the subject sequence
is a sequence of letters and digits representing an integer with the radix speci-
fied by base, optionally preceded by a â€â€™+â€â€™ or â€â€™-â€â€™ sign, but not including an inte-
ger suffix. The letters from â€â€™aâ€â€™ (or â€â€™Aâ€â€™ ) to â€â€™zâ€â€™ (or â€â€™Zâ€â€™ ) inclusive are ascribed
the values 10 to 35; only letters whose ascribed values are less than that of base
shall be permitted. If the value of base is 16, the wide-character codes 0x or 0X
may optionally precede the sequence of letters and digits, following the sign if
present.
The subject sequence is defined as the longest initial subsequence of the input
wide-character string, starting with the first wide-character code that is not
white space and is of the expected form. The subject sequence contains no wide-
character codes if the input wide-character string is empty or consists entirely of
white-space wide-character codes, or if the first wide-character code that is not
white space is other than a sign or a permissible letter or digit.
If the subject sequence has the expected form and base is 0, the sequence of wide-
character codes starting with the first digit shall be interpreted as an integer
constant. If the subject sequence has the expected form and the value of base is
between 2 and 36, it shall be used as the base for conversion, ascribing to each
letter its value as given above. If the subject sequence begins with a minus sign,
the value resulting from the conversion shall be negated. A pointer to the final
wide-character string shall be stored in the object pointed to by endptr, provided
that endptr is not a null pointer.
In other than the C or POSIX locales, other implementation-defined subject
sequences may be accepted.
If the subject sequence is empty or does not have the expected form, no conversion
shall be performed; the value of nptr shall be stored in the object pointed to by
endptr, provided that endptr is not a null pointer.
The wcstoul() function shall not change the setting of errno if successful.
Since 0, {ULONG_MAX}, and {ULLONG_MAX} are returned on error and 0 is also a valid
return on success, an application wishing to check for error situations should set
errno to 0, then call wcstoul() or wcstoull(), then check errno.
RETURN VALUE
Upon successful completion, the wcstoul() and wcstoull() functions shall return the
converted value, if any. If no conversion could be performed, 0 shall be returned
and errno may be set to indicate the error. If the correct value is outside the
range of representable values, {ULONG_MAX} or {ULLONG_MAX} respectively shall be
returned and errno set to [ERANGE].
ERRORS
These functions shall fail if:
EINVAL The value of base is not supported.
ERANGE The value to be returned is not representable.
These functions may fail if:
EINVAL No conversion could be performed.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
iswalpha() , scanf() , wcstod() , wcstol() , the Base Definitions volume of
IEEE Std 1003.1-2001, <wchar.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
POSIX 2003 WCSTOUL(P)
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