NAME

       wcstol, wcstoll - convert a wide-character string to a 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);

DESCRIPTION

       These  functions  shall  convert  the  initial portion of the wide-character string pointed to by nptr to
       long, long long, unsigned long, and unsigned long long representation, respectively.  First,  they  shall
       decompose the input 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 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 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 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.

       These functions shall 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 wishing to check for error situations should set errno to 0, then call
       wcstol() or wcstoll(), then check errno.

RETURN VALUE

       Upon successful completion, these 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, {LONG_MIN}, {LONG_MAX}, {LLONG_MIN},  or  {LLONG_MAX}
       shall be returned (according to the sign of the value), 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() , 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 .