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WCSTOUL
Section: POSIX Programmer's Manual (3P)
Updated: 2003
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
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
determined 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 constant, octal constant, or hexadecimal
constant, any of which may be preceded by a '+' or '-'
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 '0' optionally followed by a sequence
of the digits '0' to '7' only. A hexadecimal constant
consists of the prefix 0x or 0X followed by a sequence of
the decimal digits and letters 'a' (or 'A' ) to 'f'
(or 'F' ) 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 specified by base, optionally
preceded by a '+' or '-' sign, but
not including an integer suffix. The letters from 'a' (or 'A'
) to 'z' (or 'Z' ) 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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