Updated: 1 Nov 2003

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#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*);

The **wcstol()** and **wcstoll()** functions convert the initial portion of the wide character string pointed to by *nptr* to **long** and **long long** representation, 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 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* 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()**.

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**.

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.

See **attributes**(5) for descriptions of the following attributes:

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | wcstol() and wcstoll() are Standard. |

MT-Level | MT-Safe |

**iswalpha**(3C), **iswspace**(3C), **scanf**(3C), **wcstod**(3C), **attributes**(5), **standards**(5)

Truncation from **long long** to **long** can take place upon assignment or by an explicit cast.

- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- ERRORS
- ATTRIBUTES
- SEE ALSO
- NOTES

This document was created by man2html, using the manual pages.

Time: 02:37:17 GMT, October 02, 2010