freebsd-dev/lib/libc/locale/islower.3

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.\"     @(#)islower.3	8.1 (Berkeley) 6/4/93
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.Dd July 30, 2012
.Dt ISLOWER 3
.Os
.Sh NAME
.Nm islower
.Nd lower-case character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn islower "int c"
.Ft int
.Fn islower_l "int c" "locale_t loc"
.Sh DESCRIPTION
The
.Fn islower
function tests for any lower-case letters.
The value of the argument must be representable as an
.Vt "unsigned char"
or the value of
.Dv EOF .
.Pp
In the ASCII character set, this includes the following characters
(with their numeric values shown in octal):
.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
.It "\&141\ ``a''" Ta "142\ ``b''" Ta "143\ ``c''" Ta "144\ ``d''" Ta "145\ ``e''"
.It "\&146\ ``f''" Ta "147\ ``g''" Ta "150\ ``h''" Ta "151\ ``i''" Ta "152\ ``j''"
.It "\&153\ ``k''" Ta "154\ ``l''" Ta "155\ ``m''" Ta "156\ ``n''" Ta "157\ ``o''"
.It "\&160\ ``p''" Ta "161\ ``q''" Ta "162\ ``r''" Ta "163\ ``s''" Ta "164\ ``t''"
.It "\&165\ ``u''" Ta "166\ ``v''" Ta "167\ ``w''" Ta "170\ ``x''" Ta "171\ ``y''"
.It "\&172\ ``z''" Ta \& Ta \& Ta \& Ta \&
.El
The
.Fn islower_l
function takes an explicit locale argument, whereas the
.Fn islower
function uses the current global or per-thread locale.
.Sh RETURN VALUES
The
.Fn islower
and
.Fn islower_l
functions return zero if the character tests false and
return non-zero if the character tests true.
.Sh COMPATIBILITY
The
.Bx 4.4
extension of accepting arguments outside of the range of the
.Vt "unsigned char"
type in locales with large character sets is considered obsolete
and may not be supported in future releases.
The
.Fn iswlower
function should be used instead.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr iswlower 3 ,
.Xr tolower 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn islower
function conforms to
.St -isoC .
The
.Fn islower_l
function conforms to
.St -p1003.1-2008 .