wctype(3) — Linux manual page

wctype(3)               Library Functions Manual               wctype(3)

NAME

       wctype - wide-character classification

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <wctype.h>

       wctype_t wctype(const char *name);

DESCRIPTION

       The wctype_t type represents a property which a wide character
       may or may not have.  In other words, it represents a class of
       wide characters.  This type's nature is implementation-dependent,
       but the special value (wctype_t) 0 denotes an invalid property.
       Nonzero wctype_t values can be passed to the iswctype(3) function
       to actually test whether a given wide character has the property.

       The wctype() function returns a property, given by its name.  The
       set of valid names depends on the LC_CTYPE category of the
       current locale, but the following names are valid in all locales.

           "alnum" - realizes the isalnum(3) classification function
           "alpha" - realizes the isalpha(3) classification function
           "blank" - realizes the isblank(3) classification function
           "cntrl" - realizes the iscntrl(3) classification function
           "digit" - realizes the isdigit(3) classification function
           "graph" - realizes the isgraph(3) classification function
           "lower" - realizes the islower(3) classification function
           "print" - realizes the isprint(3) classification function
           "punct" - realizes the ispunct(3) classification function
           "space" - realizes the isspace(3) classification function
           "upper" - realizes the isupper(3) classification function
           "xdigit" - realizes the isxdigit(3) classification function

RETURN VALUE

       The wctype() function returns a property descriptor if the name
       is valid.  Otherwise, it returns (wctype_t) 0.

ATTRIBUTES

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────┬───────────────┬────────────────┐
       │ Interface                    │ Attribute     │ Value          │
       ├──────────────────────────────┼───────────────┼────────────────┤
       │ wctype()                     │ Thread safety │ MT-Safe locale │
       └──────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

       The behavior of wctype() depends on the LC_CTYPE category of the
       current locale.

SEE ALSO

       iswctype(3)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                      wctype(3)

Pages that refer to this page: iswctype(3), regex(7)

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