or
.Vt wint_t ) .
See the description for the similarly-named single byte classification
-functions (like
+functions (such as
.Xr isalnum 3 ) ,
for details.
+.Pp
+Extended locale versions of these functions are documented in
+.Xr iswalnum_l 3 .
+See
+.Xr xlocale 3
+for more information.
.Sh RETURN VALUES
The functions return zero if the character tests false and
return non-zero if the character tests true.
.Xr isspace 3 ,
.Xr isspecial 3 ,
.Xr isupper 3 ,
+.Xr iswalnum_l 3 ,
.Xr isxdigit 3 ,
.Xr wctype 3
.Sh STANDARDS
.Fn iswideogram ,
.Fn iswnumber ,
.Fn iswphonogram ,
-.Fn iswrune
+.Fn iswrune ,
and
.Fn iswspecial ,
which are