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wcstol(3c)
Standard C Library Functions wcstol(3C)
NAME
wcstol, wcstoll, wstol, watol, watoll, watoi - convert wide character
string to long integer
SYNOPSIS
#include <wchar.h>
long wcstol(const wchar_t *restrict nptr, wchar_t **restrict endptr,
int base);
long long wcstoll(const wchar_t *restrict nptr, wchar_t **restrict endptr,
int base);
#include <widec.h>
long wstol(const wchar_t *nptr, wchar_t **endptr, int base);
long watol(wchar_t *nptr);
long long watoll(wchar_t *nptr);
int watoi(wchar_t *nptr);
DESCRIPTION
The wcstol() and wcstoll() functions convert the initial portion of the
wide character string pointed to by nptr to long and long long repre‐
sentation, respectively. They first decompose the input string into
three parts:
1. an initial, possibly empty, sequence of white-space wide-
character codes (as specified by iswspace(3C))
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 unrecognised
wide character codes, including the terminating null wide-
character code of the input wide character string
They then attempt to convert the subject sequence to an integer, and
return the result.
If the value of 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 fol‐
lowed by a sequence of the digits '0' to '7' only. A hexadecimal con‐
stant 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 sub‐
ject sequence is a sequence of letters and digits representing an inte‐
ger 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 are permitted.
If the value of base is 16, the wide-character code representations of
'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 non-white-
space wide-character code, that 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
code, or if the first non-white-space wide-character code is other than
a sign or a permissible letter or digit.
If the subject sequence has the expected form and the value of base is
0, the sequence of wide-character codes starting with the first digit
is interpreted as an integer constant. If the subject sequence has the
expected form and the value of base is between 2 and 36, it is 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 is negated. A pointer to the final wide
character string is stored in the object pointed to by endptr, provided
that endptr is not a null pointer.
If the subject sequence is empty or does not have the expected form, no
conversion is performed; the value of nptr is stored in the object
pointed to by endptr, provided that endptr is not a null pointer.
These functions do not change the setting of errno if successful.
Since 0, {LONG_MIN} or {LLONG_MIN}, and {LONG_MAX} or {LLONG_MAX} are
returned on error and are also valid returns on success, an application
wanting to check for error situations should set errno to 0, call one
of these functions, then check errno.
The wstol() function is equivalent to wcstol().
The watol() function is equivalent to wstol(str,(wchar_t **)NULL, 10).
The watoll() function is the long-long (double long) version of
watol().
The watoi() function is equivalent to (int)watol().
RETURN VALUES
Upon successful completion, these functions return the converted value,
if any. If no conversion could be performed, 0 is returned and errno
may be set to indicate the error. If the correct value is outside the
range of representable values, {LONG_MIN}, {LONG_MAX}, {LLONG_MIN}, or
{LLONG_MAX} is returned (according to the sign of the value), and errno
is set to ERANGE.
ERRORS
These functions will 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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface Stabilitywcstol() and wcstoll() are Standard.
_ MT-LevelMT-Safe
SEE ALSO
iswalpha(3C), iswspace(3C), scanf(3C), wcstod(3C), attributes(7), stan‐
dards(7)
NOTES
Truncation from long long to long can take place upon assignment or by
an explicit cast.
Oracle Solaris 11.4 1 Nov 2003 wcstol(3C)