Name

iswlower — test for lowercase wide character

Synopsis

#include <wctype.h>
int iswlower( wint_t wc);
 

DESCRIPTION

The iswlower() function is the wide-character equivalent of the islower(3) function. It tests whether wc is a wide character belonging to the wide-character class "lower".

The wide-character class "lower" is a subclass of the wide-character class "alpha", and therefore also a subclass of the wide-character class "alnum", 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 "lower" is disjoint from the wide-character class "cntrl".

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

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

The wide-character class "lower" contains at least those characters wc which are equal to towlower(wc) and different from towupper(wc).

The wide-character class "lower" always contains at least the letters 'a' to 'z'.

RETURN VALUE

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

CONFORMING TO

C99.

NOTES

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

This function is not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower and title case.

SEE ALSO

islower(3), iswctype(3), towlower(3)

COLOPHON

This page is part of release 3.24 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  Copyright (c) Bruno Haible <haibleclisp.cons.org>

This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.

References consulted:
  GNU glibc-2 source code and manual
  Dinkumware C library reference http://www.dinkumware.com/
  OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
  ISO/IEC 9899:1999