104 lines
3.6 KiB
Groff
104 lines
3.6 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)islower.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd July 30, 2012
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.Dt ISLOWER 3
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.Os
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.Sh NAME
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.Nm islower
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.Nd lower-case character test
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In ctype.h
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.Ft int
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.Fn islower "int c"
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.Ft int
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.Fn islower_l "int c" "locale_t loc"
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.Sh DESCRIPTION
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The
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.Fn islower
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function tests for any lower-case letters.
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The value of the argument must be representable as an
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.Vt "unsigned char"
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or the value of
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.Dv EOF .
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.Pp
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In the ASCII character set, this includes the following characters
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(with their numeric values shown in octal):
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.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
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.It "\&141\ ``a''" Ta "142\ ``b''" Ta "143\ ``c''" Ta "144\ ``d''" Ta "145\ ``e''"
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.It "\&146\ ``f''" Ta "147\ ``g''" Ta "150\ ``h''" Ta "151\ ``i''" Ta "152\ ``j''"
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.It "\&153\ ``k''" Ta "154\ ``l''" Ta "155\ ``m''" Ta "156\ ``n''" Ta "157\ ``o''"
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.It "\&160\ ``p''" Ta "161\ ``q''" Ta "162\ ``r''" Ta "163\ ``s''" Ta "164\ ``t''"
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.It "\&165\ ``u''" Ta "166\ ``v''" Ta "167\ ``w''" Ta "170\ ``x''" Ta "171\ ``y''"
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.It "\&172\ ``z''" Ta \& Ta \& Ta \& Ta \&
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.El
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The
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.Fn islower_l
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function takes an explicit locale argument, whereas the
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.Fn islower
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function uses the current global or per-thread locale.
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.Sh RETURN VALUES
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The
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.Fn islower
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and
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.Fn islower_l
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functions return zero if the character tests false and
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return non-zero if the character tests true.
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.Sh COMPATIBILITY
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The
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.Bx 4.4
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extension of accepting arguments outside of the range of the
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.Vt "unsigned char"
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type in locales with large character sets is considered obsolete
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and may not be supported in future releases.
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The
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.Fn iswlower
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function should be used instead.
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.Sh SEE ALSO
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.Xr ctype 3 ,
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.Xr iswlower 3 ,
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.Xr tolower 3 ,
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.Xr ascii 7
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.Sh STANDARDS
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The
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.Fn islower
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function conforms to
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.St -isoC .
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The
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.Fn islower_l
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function conforms to
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.St -p1003.1-2008 .
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