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.\" @(#)toupper.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: head/lib/libc/locale/toupper.3 210468 2010-07-25 13:32:19Z bcr $ 34.\" 35.Dd July 25, 2010 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.Fn toupper "int c" 48.In ctype.h 49.In xlocale.h 50.Ft int 51.Fn toupper_l "int c" "locale_t loc" 52.Sh DESCRIPTION 53The 54.Fn toupper 55function converts a lower-case letter to the corresponding 56upper-case letter. 57The argument must be representable as an 58.Vt "unsigned char" 59or the value of 60.Dv EOF . 61.Pp 62The _l-suffixed version takes an explicit locale argument, whereas the 63non-suffixed version uses the current global or per-thread locale. 64.Sh RETURN VALUES 65If the argument is a lower-case letter, the 66.Fn toupper 67function returns the corresponding upper-case letter if there is 68one; otherwise, the argument is returned unchanged. 69.Sh COMPATIBILITY 70The 71.Bx 4.4 72extension of accepting arguments outside of the range of the 73.Vt "unsigned char" 74type in locales with large character sets is considered obsolete 75and may not be supported in future releases. 76The 77.Fn towupper 78function should be used instead. 79.Sh SEE ALSO 80.Xr ctype 3 , 81.Xr ctype_l 3 , 82.Xr isupper 3 , 83.Xr towupper 3 , 84.Xr xlocale 3 85.Sh STANDARDS 86The 87.Fn toupper 88function conforms to 89.St -isoC . 90