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90 lines
2.5 KiB
Groff
90 lines
2.5 KiB
Groff
.\"
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.\" Copyright (c) 2004 Tim J. Robbins
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.\" All rights reserved.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.Dd December 19, 2022
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.Dt ISRUNE 3
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.Os
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.Sh NAME
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.Nm isrune ,
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.Nm isrune_l
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.Nd valid character test
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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 isrune "int c"
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.Ft int
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.Fn isrune_l "int c" "locale_t loc"
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.Sh DESCRIPTION
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The
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.Fn isrune
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and
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.Fn isrune_l
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functions test for any character that is valid in the current
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character set.
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In the
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.Tn ASCII
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character set, this is equivalent to
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.Fn isascii .
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.Pp
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The
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.Fn isrune_l
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function takes an explicit locale argument, whereas the
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.Fn isrune
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function uses the current global or per-thread locale.
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.Sh RETURN VALUES
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The
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.Fn isrune
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and
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.Fn isrune_l
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functions return zero if the character tests false and
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return non-zero if the character tests true.
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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 iswrune
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or
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.Fn iswrune_l
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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 ctype_l 3 ,
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.Xr isascii 3 ,
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.Xr iswrune 3 ,
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.Xr iswrune_l 3 ,
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.Xr xlocale 3 ,
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.Xr ascii 7
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.Sh HISTORY
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The
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.Fn isrune
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function appeared in
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.Bx 4.4 .
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