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

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.\"     @(#)islower.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.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"
.Sh DESCRIPTION
The
.Fn islower
function tests for any lower-case letters.
For single C
.Va char Ns s
locales (see
.Xr multibyte 3 )
the value of the argument is
representable as an
.Li unsigned char
or the value of
.Dv EOF .
In the ASCII character set, this includes the following characters
(with their numeric values shown in octal):
.Pp
.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
.It "\&141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d'' \t145\ ``e''"
.It "\&146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i'' \t152\ ``j''"
.It "\&153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n'' \t157\ ``o''"
.It "\&160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s'' \t164\ ``t''"
.It "\&165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x'' \t171\ ``y''"
.It "\&172\ ``z''"
.El
.Sh RETURN VALUES
The
.Fn islower
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr multibyte 3 ,
.Xr tolower 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn islower
function conforms to
.St -isoC .