wcstoull

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
       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 vol-
       ume of IEEE Std 1003.1-2001, <wchar.h>


IEEE/The Open Group                  2003                           WCSTOUL(P)