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WCSTOL(3P)                 POSIX Programmer's Manual                WCSTOL(3P)

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
       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  let-
       ters '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 shall be  per-
       mitted. If the value of base is 16, the wide-character code representa-
       tions 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 .

IEEE/The Open Group                  2003                           WCSTOL(3P)