mirror of https://github.com/mkerrisk/man-pages
71 lines
1.7 KiB
Groff
71 lines
1.7 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\" %%%LICENSE_END
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
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.\"
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.TH WCWIDTH 3 2014-01-22 "GNU" "Linux Programmer's Manual"
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.SH NAME
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wcwidth \- determine columns needed for a wide character
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.SH SYNOPSIS
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.nf
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.BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
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.B #include <wchar.h>
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.sp
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.BI "int wcwidth(wchar_t " c );
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.fi
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.SH DESCRIPTION
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The
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.BR wcwidth ()
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function returns the number of columns
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needed to represent the wide character
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.IR c .
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If
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.I c
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is a printable wide character, the value
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is at least 0.
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If
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.I c
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is null wide character (L\(aq\\0\(aq), the value is 0.
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Otherwise, \-1 is returned.
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.SH RETURN VALUE
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The
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.BR wcwidth ()
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function returns the number of
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column positions for
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.IR c .
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR wcwidth ()
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function is thread-safe with exceptions.
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It can be safely used in multithreaded applications, as long as
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.BR setlocale (3)
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is not called to change the locale during its execution.
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.SH CONFORMING TO
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POSIX.1-2001.
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Note that glibc before 2.2.5 used the prototype
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.br
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.nf
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.BI "int wcwidth(wint_t " c );
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.fi
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.SH NOTES
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The behavior of
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.BR wcwidth ()
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depends on the
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.B LC_CTYPE
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category of the
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current locale.
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.SH SEE ALSO
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.BR iswprint (3),
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.BR wcswidth (3)
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