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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  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
       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.

       The  wcstoul()  function  shall not change the setting of errno if suc-
       cessful.

       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
       iswalpha(), scanf(), wcstod(), wcstol(), 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                          WCSTOUL(3P)
 

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