locale/FreeBSD/tolower.3

   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.
   7 .\"
   8 .\" Redistribution and use in source and binary forms, with or without
   9 .\" modification, are permitted provided that the following conditions
  10 .\" are met:
  11 .\" 1. Redistributions of source code must retain the above copyright
  12 .\"    notice, this list of conditions and the following disclaimer.
  13 .\" 2. Redistributions in binary form must reproduce the above copyright
  14 .\"    notice, this list of conditions and the following disclaimer in the
  15 .\"    documentation and/or other materials provided with the distribution.
  16 .\" 4. Neither the name of the University nor the names of its contributors
  17 .\"    may be used to endorse or promote products derived from this software
  18 .\"    without specific prior written permission.
  19 .\"
  20 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30 .\" SUCH DAMAGE.
  31 .\"
  32 .\"     @(#)tolower.3   8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/locale/tolower.3,v 1.21 2009/09/04 07:44:58 des Exp $
  34 .\"
  35 .Dd July 17, 2005
  36 .Dt TOLOWER 3
  37 .Os
  38 .Sh NAME
  39 .Nm tolower
  40 .Nd upper case to lower case letter conversion
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In ctype.h
  45 .Ft int
  46 .Fn tolower "int c"
  47 .Sh DESCRIPTION
  48 The
  49 .Fn tolower
  50 function converts an upper-case letter to the corresponding lower-case
  51 letter.
  52 The argument must be representable as an
  53 .Vt "unsigned char"
  54 or the value of
  55 .Dv EOF .
  56 .Sh RETURN VALUES
  57 If the argument is an upper-case letter, the
  58 .Fn tolower
  59 function returns the corresponding lower-case letter if there is
  60 one; otherwise the argument is returned unchanged.
  61 .Sh COMPATIBILITY
  62 The
  63 .Bx 4.4
  64 extension of accepting arguments outside of the range of the
  65 .Vt "unsigned char"
  66 type in locales with large character sets is considered obsolete
  67 and may not be supported in future releases.
  68 The
  69 .Fn towlower
  70 function should be used instead.
  71 .Sh SEE ALSO
  72 .Xr ctype 3 ,
  73 .Xr islower 3 ,
  74 .Xr towlower 3
  75 .Sh STANDARDS
  76 The
  77 .Fn tolower
  78 function conforms to
  79 .St -isoC .