awk and POSIX character class Post: 302459359

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LEARN ABOUT X11R4

iswalpha

ISWALPHA(3)						     Linux Programmer's Manual						       ISWALPHA(3)

NAME

       iswalpha - test for alphabetic wide character

SYNOPSIS

       #include <wctype.h>

       int iswalpha(wint_t wc);

DESCRIPTION

       The  iswalpha() function is the wide-character equivalent of the isalpha(3) function.  It tests whether wc is a wide character belonging to
       the wide-character class "alpha".

       The wide-character class "alpha" is a subclass of the wide-character class "alnum", and therefore also a  subclass  of  the  wide-character
       class "graph" and of the wide-character class "print".

       Being a subclass of the wide-character class "print", the wide-character class "alpha" is disjoint from the wide-character class "cntrl".

       Being  a  subclass  of the wide-character class "graph", the wide-character class "alpha" is disjoint from the wide-character class "space"
       and its subclass "blank".

       Being a subclass of the wide-character class "alnum", the wide-character class "alpha" is disjoint from the wide-character class "punct".

       The wide-character class "alpha" is disjoint from the wide-character class "digit".

       The wide-character class "alpha" contains the wide-character classes "upper" and "lower".

       The wide-character class "alpha" always contains at least the letters 'A' to 'Z' and 'a' to 'z'.

RETURN VALUE

       The iswalpha() function returns nonzero if wc is a wide character belonging to the wide-character class	"alpha".   Otherwise,  it  returns
       zero.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+----------------+
       |Interface  | Attribute	   | Value	    |
       +-----------+---------------+----------------+
       |iswalpha() | Thread safety | MT-Safe locale |
       +-----------+---------------+----------------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES

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

SEE ALSO

       isalpha(3), iswctype(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2015-08-08							       ISWALPHA(3)