mirror of https://github.com/mkerrisk/man-pages
93 lines
2.7 KiB
Groff
93 lines
2.7 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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.\" ISO/IEC 9899:1999
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.\"
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.TH WCTYPE 3 2014-01-22 "GNU" "Linux Programmer's Manual"
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.SH NAME
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wctype \- wide-character classification
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.SH SYNOPSIS
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.nf
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.B #include <wctype.h>
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.sp
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.BI "wctype_t wctype(const char *" name );
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.fi
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.SH DESCRIPTION
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The
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.I wctype_t
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type represents a property which a wide character may or
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may not have.
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In other words, it represents a class of wide characters.
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This type's nature is implementation-dependent, but the special value
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.I "(wctype_t) 0"
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denotes an invalid property.
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Nonzero
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.I wctype_t
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values
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can be passed to the
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.BR iswctype (3)
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function
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to actually test whether a given
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wide character has the property.
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.PP
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The
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.BR wctype ()
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function returns a property, given by its name.
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The set of
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valid names depends on the
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.B LC_CTYPE
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category of the current locale, but the
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following names are valid in all locales.
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.nf
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"alnum" \- realizes the \fBisalnum\fP(3) classification function
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"alpha" \- realizes the \fBisalpha\fP(3) classification function
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"blank" \- realizes the \fBisblank\fP(3) classification function
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"cntrl" \- realizes the \fBiscntrl\fP(3) classification function
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"digit" \- realizes the \fBisdigit\fP(3) classification function
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"graph" \- realizes the \fBisgraph\fP(3) classification function
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"lower" \- realizes the \fBislower\fP(3) classification function
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"print" \- realizes the \fBisprint\fP(3) classification function
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"punct" \- realizes the \fBispunct\fP(3) classification function
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"space" \- realizes the \fBisspace\fP(3) classification function
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"upper" \- realizes the \fBisupper\fP(3) classification function
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"xdigit" \- realizes the \fBisxdigit\fP(3) classification function
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.fi
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.SH RETURN VALUE
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The
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.BR wctype ()
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function returns a property descriptor
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if the
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.I name
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is valid.
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Otherwise, it returns
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.IR "(wctype_t) 0" .
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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 wctype ()
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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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C99.
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.SH NOTES
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The behavior of
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.BR wctype ()
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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 iswctype (3)
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