.Dt TOUPPER 3
.Os
.Sh NAME
-.Nm toupper
+.Nm toupper ,
+.Nm toupper_l
.Nd lower case to upper case letter conversion
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
-.Fn toupper "int c"
+.Fo toupper
+.Fa "int c"
+.Fc
+.In ctype.h
+.In xlocale.h
+.Ft int
+.Fo toupper_l
+.Fa "int c"
+.Fa "locale_t loc"
+.Fc
.Sh DESCRIPTION
The
.Fn toupper
.Vt "unsigned char"
or the value of
.Dv EOF .
+.Pp
+Although the
+.Fn toupper
+function uses the current locale, the
+.Fn toupper_l
+function may be passed a locale directly. See
+.Xr xlocale 3
+for more information.
.Sh RETURN VALUES
If the argument is a lower-case letter, the
.Fn toupper
function returns the corresponding upper-case letter if there is
-one; otherwise the argument is returned unchanged.
+one; otherwise, the argument is returned unchanged.
.Sh COMPATIBILITY
The
.Bx 4.4
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr isupper 3 ,
-.Xr towupper 3
+.Xr towupper 3 ,
+.Xr xlocale 3
.Sh STANDARDS
The
.Fn toupper