mirror of https://github.com/mkerrisk/man-pages
75 lines
2.2 KiB
Groff
75 lines
2.2 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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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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.\"
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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 ISWDIGIT 3 1999-07-25 "GNU" "Linux Programmer's Manual"
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.SH NAME
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iswdigit \- test for decimal digit wide character
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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 "int iswdigit(wint_t " wc );
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.fi
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.SH DESCRIPTION
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The
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.BR iswdigit ()
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function is the wide-character equivalent of the
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.BR isdigit (3)
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function.
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It tests whether \fIwc\fP is a wide character
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belonging to the wide-character class "digit".
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.PP
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The wide-character class "digit" is a subclass of the wide-character class
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"xdigit", and therefore also a subclass
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of the wide-character class "alnum", of
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the wide-character class "graph" and of the wide-character class "print".
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.PP
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Being a subclass of the wide character
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class "print", the wide-character class
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"digit" is disjoint from the wide-character class "cntrl".
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.PP
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Being a subclass of the wide-character class "graph",
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the wide-character class
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"digit" is disjoint from the wide-character class "space" and its subclass
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"blank".
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.PP
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Being a subclass of the wide-character
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class "alnum", the wide-character class
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"digit" is disjoint from the wide-character class "punct".
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.PP
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The wide-character class "digit" is
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disjoint from the wide-character class
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"alpha" and therefore also disjoint from its subclasses "lower", "upper".
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.PP
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The wide-character class "digit" always
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contains exactly the digits \(aq0\(aq to \(aq9\(aq.
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.SH "RETURN VALUE"
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The
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.BR iswdigit ()
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function returns non-zero
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if \fIwc\fP is a wide character
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belonging to the wide-character class "digit".
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Otherwise it returns zero.
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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 iswdigit ()
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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 isdigit (3),
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.BR iswctype (3)
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