man3/iswlower.3

   1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
   2 .\"
   3 .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
   4 .\" This is free documentation; you can redistribute it and/or
   5 .\" modify it under the terms of the GNU General Public License as
   6 .\" published by the Free Software Foundation; either version 2 of
   7 .\" the License, or (at your option) any later version.
   8 .\" %%%LICENSE_END
   9 .\"
  10 .\" References consulted:
  11 .\"   GNU glibc-2 source code and manual
  12 .\"   Dinkumware C library reference http://www.dinkumware.com/
  13 .\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
  14 .\"   ISO/IEC 9899:1999
  15 .\"
  16 .TH ISWLOWER 3  1999-07-25 "GNU" "Linux Programmer's Manual"
  17 .SH NAME
  18 iswlower \- test for lowercase wide character
  19 .SH SYNOPSIS
  20 .nf
  21 .B #include <wctype.h>
  22 .sp
  23 .BI "int iswlower(wint_t " wc );
  24 .fi
  25 .SH DESCRIPTION
  26 The
  27 .BR iswlower ()
  28 function is the wide-character equivalent of the
  29 .BR islower (3)
  30 function.
  31 It tests whether \fIwc\fP is a wide character
  32 belonging to the wide-character class "lower".
  33 .PP
  34 The wide-character class "lower" is a subclass of the wide-character class
  35 "alpha", and therefore also a subclass
  36 of the wide-character class "alnum", of
  37 the wide-character class "graph" and of the wide-character class "print".
  38 .PP
  39 Being a subclass of the wide-character class "print",
  40 the wide-character class
  41 "lower" is disjoint from the wide-character class "cntrl".
  42 .PP
  43 Being a subclass of the wide-character class "graph",
  44 the wide-character class "lower" is disjoint from the
  45 wide-character class "space" and its subclass "blank".
  46 .PP
  47 Being a subclass of the wide-character class "alnum",
  48 the wide-character class
  49 "lower" is disjoint from the wide-character class "punct".
  50 .PP
  51 Being a subclass of the wide-character class "alpha",
  52 the wide-character class
  53 "lower" is disjoint from the wide-character class "digit".
  54 .PP
  55 The wide-character class "lower" contains at least
  56 those characters \fIwc\fP
  57 which are equal to \fItowlower(wc)\fP and different
  58 from \fItowupper(wc)\fP.
  59 .PP
  60 The wide-character class "lower" always contains
  61 at least the letters \(aqa\(aq to \(aqz\(aq.
  62 .SH RETURN VALUE
  63 The
  64 .BR iswlower ()
  65 function returns nonzero
  66 if \fIwc\fP is a wide character
  67 belonging to the wide-character class "lower".
  68 Otherwise it returns zero.
  69 .SH CONFORMING TO
  70 C99.
  71 .SH NOTES
  72 The behavior of
  73 .BR iswlower ()
  74 depends on the
  75 .B LC_CTYPE
  76 category of the
  77 current locale.
  78 .PP
  79 This function is not very appropriate for dealing with Unicode characters,
  80 because Unicode knows about three cases: upper, lower and title case.
  81 .SH SEE ALSO
  82 .BR islower (3),
  83 .BR iswctype (3),
  84 .BR towlower (3)