mirror of https://github.com/mkerrisk/man-pages
84 lines
2.5 KiB
Groff
84 lines
2.5 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\" ISO/IEC 9899:1999
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.\"
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.TH ISWLOWER 3 1999-07-25 "GNU" "Linux Programmer's Manual"
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.SH NAME
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iswlower \- test for lowercase wide character
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.SH SYNOPSIS
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.nf
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.B #include <wctype.h>
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.sp
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.BI "int iswlower(wint_t " wc );
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.fi
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.SH DESCRIPTION
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The
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.BR iswlower ()
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function is the wide-character equivalent of the
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.BR islower (3)
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function.
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It tests whether \fIwc\fP is a wide character
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belonging to the wide-character class "lower".
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.PP
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The wide-character class "lower" is a subclass of the wide-character class
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"alpha", and therefore also a subclass
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of the wide-character class "alnum", of
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the wide-character class "graph" and of the wide-character class "print".
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.PP
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Being a subclass of the wide-character class "print",
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the wide-character class
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"lower" is disjoint from the wide-character class "cntrl".
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.PP
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Being a subclass of the wide-character class "graph",
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the wide-character class "lower" is disjoint from the
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wide-character class "space" and its subclass "blank".
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.PP
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Being a subclass of the wide-character class "alnum",
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the wide-character class
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"lower" is disjoint from the wide-character class "punct".
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.PP
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Being a subclass of the wide-character class "alpha",
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the wide-character class
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"lower" is disjoint from the wide-character class "digit".
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.PP
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The wide-character class "lower" contains at least
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those characters \fIwc\fP
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which are equal to \fItowlower(wc)\fP and different
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from \fItowupper(wc)\fP.
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.PP
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The wide-character class "lower" always contains
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at least the letters 'a'
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to 'z'.
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.SH "RETURN VALUE"
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The
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.BR iswlower ()
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function returns nonzero
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if \fIwc\fP is a wide character
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belonging to the wide-character class "lower".
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Otherwise it returns zero.
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.SH "CONFORMING TO"
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C99.
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.SH NOTES
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The behavior of
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.BR iswlower ()
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depends on the
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.B LC_CTYPE
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category of the
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current locale.
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.PP
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This function is not very appropriate for dealing with Unicode characters,
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because Unicode knows about three cases: upper, lower and title case.
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.SH "SEE ALSO"
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.BR islower (3),
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.BR iswctype (3),
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.BR towlower (3)
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