80 lines
2.7 KiB
Groff
80 lines
2.7 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tolower.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd July 17, 2005
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.Dt TOLOWER 3
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.Os
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.Sh NAME
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.Nm tolower
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.Nd upper case to lower case letter conversion
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In ctype.h
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.Ft int
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.Fn tolower "int c"
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.Sh DESCRIPTION
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The
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.Fn tolower
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function converts an upper-case letter to the corresponding lower-case
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letter.
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The argument must be representable as an
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.Vt "unsigned char"
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or the value of
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.Dv EOF .
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.Sh RETURN VALUES
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If the argument is an upper-case letter, the
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.Fn tolower
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function returns the corresponding lower-case letter if there is
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one; otherwise the argument is returned unchanged.
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.Sh COMPATIBILITY
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The
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.Bx 4.4
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extension of accepting arguments outside of the range of the
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.Vt "unsigned char"
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type in locales with large character sets is considered obsolete
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and may not be supported in future releases.
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The
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.Fn towlower
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function should be used instead.
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.Sh SEE ALSO
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.Xr ctype 3 ,
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.Xr islower 3 ,
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.Xr towlower 3
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.Sh STANDARDS
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The
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.Fn tolower
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function conforms to
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.St -isoC .
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