Open Source Software

iswlower(3)



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.

ATTRIBUTES

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

   
   Interface   Attribute      Value          
   
   iswlower()  Thread safety  MT-Safe locale

CONFORMING TO

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

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