Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / tolower.3
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1.\" Copyright (c) 1989, 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
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9.\" modification, are permitted provided that the following conditions
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35.\"
36.\" @(#)tolower.3 8.1 (Berkeley) 6/4/93
37.\" $FreeBSD: src/lib/libc/locale/tolower.3,v 1.6.2.4 2001/12/14 18:33:55 ru Exp $
9cbd208e 38.\" $DragonFly: src/lib/libc/gen/tolower.3,v 1.3 2006/04/08 08:57:00 swildner Exp $
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39.\"
40.Dd June 4, 1993
41.Dt TOLOWER 3
42.Os
43.Sh NAME
44.Nm tolower
45.Nd upper case to lower case letter conversion
46.Sh LIBRARY
47.Lb libc
48.Sh SYNOPSIS
49.In ctype.h
50.Ft int
51.Fn tolower "int c"
52.Sh DESCRIPTION
53The
54.Fn tolower
55function converts an upper-case letter to the corresponding lower-case
56letter.
57For single C
58.Va char Ns s
9cbd208e 59locales the value of the argument is
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60representable as an
61.Li unsigned char
62or the value of
63.Dv EOF .
64.Sh RETURN VALUES
65If the argument is an upper-case letter, the
66.Fn tolower
67function returns the corresponding lower-case letter if there is
68one; otherwise the argument is returned unchanged.
69.Sh SEE ALSO
70.Xr isalnum 3 ,
71.Xr isalpha 3 ,
72.Xr isascii 3 ,
73.Xr iscntrl 3 ,
74.Xr isdigit 3 ,
75.Xr isgraph 3 ,
76.Xr islower 3 ,
77.Xr isprint 3 ,
78.Xr ispunct 3 ,
79.Xr isspace 3 ,
80.Xr isupper 3 ,
81.Xr isxdigit 3 ,
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82.Xr stdio 3 ,
83.Xr toascii 3 ,
84.Xr toupper 3 ,
85.Xr ascii 7
86.Sh STANDARDS
87The
88.Fn tolower
89function conforms to
90.St -isoC .