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WCSTOUL(3P)                POSIX Programmer's Manual               WCSTOUL(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
       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  functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the  requirements  described  here
       and  the  ISO C  standard is unintentional. This volume of POSIX.1-2008
       defers to the ISO C standard.
       The wcstoul() and wcstoull() functions shall convert the  initial  por-
       tion  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  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 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 sub-
       ject 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,  {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 val-
       ues, {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
       fscanf(), iswalpha(), wcstod(), wcstol()
       The Base Definitions volume of POSIX.1-2008, <wchar.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          WCSTOUL(3P)