1.\"	$NetBSD: toupper.3,v 1.17 2008/04/17 16:25:36 apb Exp $
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8.\" Processing Systems.
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34.\"	@(#)toupper.3	5.2 (Berkeley) 6/29/91
35.\"
36.Dd April 17, 2008
37.Dt TOUPPER 3
38.Os
39.Sh NAME
40.Nm toupper
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.Fn toupper "int c"
48.Sh DESCRIPTION
49The
50.Fn toupper
51function converts a lower-case letter to the corresponding
52upper-case letter.
53.Sh RETURN VALUES
54If the argument is a lower-case letter, the
55.Fn toupper
56function returns the corresponding upper-case letter if there is
57one; otherwise the argument is returned unchanged.
58.\" In the
59.\" .Em ``C''
60.\" locale,
61.\" .Fn toupper
62.\" maps only the characters for which
63.\" .Xr islower
64.\" is true to the corresponding characters for which
65.\" .Xr isupper
66.\" is true.
67.Sh SEE ALSO
68.Xr ctype 3 ,
69.Xr isalnum 3 ,
70.Xr isalpha 3 ,
71.Xr isascii 3 ,
72.Xr iscntrl 3 ,
73.Xr isdigit 3 ,
74.Xr isgraph 3 ,
75.Xr islower 3 ,
76.Xr isprint 3 ,
77.Xr ispunct 3 ,
78.Xr isspace 3 ,
79.Xr isupper 3 ,
80.Xr isxdigit 3 ,
81.Xr stdio 3 ,
82.Xr toascii 3 ,
83.Xr ascii 7
84.Sh STANDARDS
85The
86.Fn toupper
87function conforms to
88.St -ansiC .
89.Sh CAVEATS
90The argument to
91.Fn toupper
92must be
93.Dv EOF
94or representable as an
95.Vt unsigned char ;
96otherwise, the behavior is undefined.
97See the
98.Sx CAVEATS
99section of
100.Xr ctype 3
101for more details.
102