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32 .\" @(#)toupper.3 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libc/locale/toupper.3,v 1.21 2009/09/04 07:44:58 des Exp $
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35 .Dd July 17, 2005
36 .Dt TOUPPER 3
37 .Os
38 .Sh NAME
39 .Nm toupper ,
40 .Nm toupper_l
41 .Nd lower case to upper case letter conversion
42 .Sh LIBRARY
43 .Lb libc
44 .Sh SYNOPSIS
45 .In ctype.h
46 .Ft int
47 .Fo toupper
48 .Fa "int c"
49 .Fc
50 .In ctype.h
51 .In xlocale.h
52 .Ft int
53 .Fo toupper_l
54 .Fa "int c"
55 .Fa "locale_t loc"
56 .Fc
57 .Sh DESCRIPTION
58 The
59 .Fn toupper
60 function converts a lower-case letter to the corresponding
61 upper-case letter.
62 The argument must be representable as an
63 .Vt "unsigned char"
64 or the value of
65 .Dv EOF .
66 .Pp
67 Although the
68 .Fn toupper
69 function uses the current locale, the
70 .Fn toupper_l
71 function may be passed a locale directly. See
72 .Xr xlocale 3
73 for more information.
74 .Sh RETURN VALUES
75 If the argument is a lower-case letter, the
76 .Fn toupper
77 function returns the corresponding upper-case letter if there is
78 one; otherwise, the argument is returned unchanged.
79 .Sh COMPATIBILITY
80 The
81 .Bx 4.4
82 extension of accepting arguments outside of the range of the
83 .Vt "unsigned char"
84 type in locales with large character sets is considered obsolete
85 and may not be supported in future releases.
86 The
87 .Fn towupper
88 function should be used instead.
89 .Sh SEE ALSO
90 .Xr ctype 3 ,
91 .Xr isupper 3 ,
92 .Xr towupper 3 ,
93 .Xr xlocale 3
94 .Sh STANDARDS
95 The
96 .Fn toupper
97 function conforms to
98 .St -isoC .