xref: /dflybsd-src/lib/libc/locale/isalnum.3 (revision c66c7e2fb8d0d28477d550f1d2a50c4677d547ff)

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.\"     @(#)isalnum.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: head/lib/libc/locale/isalnum.3 233992 2012-04-07 09:05:30Z joel $
.\"
.Dd December 25, 2013
.Dt ISALNUM 3
.Os
.Sh NAME
.Nm isalnum ,
.Nm isalnum_l
.Nd alphanumeric character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isalnum "int c"
.Ft int
.Fn isalnum_l "int c" "locale_t locale"
.Sh DESCRIPTION
The
.Fn isalnum
and
.Fn isalnum_l
functions test for any character for which
.Xr isalpha 3
or
.Xr isdigit 3
is true.
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 "\&060\ ``0''" Ta "061\ ``1''" Ta "062\ ``2''" Ta "063\ ``3''" Ta "064\ ``4''"
.It "\&065\ ``5''" Ta "066\ ``6''" Ta "067\ ``7''" Ta "070\ ``8''" Ta "071\ ``9''"
.It "\&101\ ``A''" Ta "102\ ``B''" Ta "103\ ``C''" Ta "104\ ``D''" Ta "105\ ``E''"
.It "\&106\ ``F''" Ta "107\ ``G''" Ta "110\ ``H''" Ta "111\ ``I''" Ta "112\ ``J''"
.It "\&113\ ``K''" Ta "114\ ``L''" Ta "115\ ``M''" Ta "116\ ``N''" Ta "117\ ``O''"
.It "\&120\ ``P''" Ta "121\ ``Q''" Ta "122\ ``R''" Ta "123\ ``S''" Ta "124\ ``T''"
.It "\&125\ ``U''" Ta "126\ ``V''" Ta "127\ ``W''" Ta "130\ ``X''" Ta "131\ ``Y''"
.It "\&132\ ``Z''" Ta "141\ ``a''" Ta "142\ ``b''" Ta "143\ ``c''" Ta "144\ ``d''"
.It "\&145\ ``e''" Ta "146\ ``f''" Ta "147\ ``g''" Ta "150\ ``h''" Ta "151\ ``i''"
.It "\&152\ ``j''" Ta "153\ ``k''" Ta "154\ ``l''" Ta "155\ ``m''" Ta "156\ ``n''"
.It "\&157\ ``o''" Ta "160\ ``p''" Ta "161\ ``q''" Ta "162\ ``r''" Ta "163\ ``s''"
.It "\&164\ ``t''" Ta "165\ ``u''" Ta "166\ ``v''" Ta "167\ ``w''" Ta "170\ ``x''"
.It "\&171\ ``y''" Ta "172\ ``z''" Ta \& Ta \& Ta \&
.El
.Pp
The
.Fn isalnum_l
function takes an explicit
.Fa locale
argument, whereas the
.Fn isalnum
function uses the current global or per-thread locale.
.Sh RETURN VALUES
The
.Fn isalnum
and
.Fn isalnum_l
functions return zero if the character tests false and
returns 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 iswalnum
and
.Fn iswalnum_l
functions should be used instead.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr ctype_l 3 ,
.Xr isalpha 3 ,
.Xr isdigit 3 ,
.Xr iswalnum 3 ,
.Xr iswalnum_l 3 ,
.Xr xlocale 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isalnum
function conforms to
.St -isoC .
The
.Fn isalnum_l
function conforms to
.St -p1003.1-2008 .