string_copying.7: Document strndup(3)

[thirdparty/man-pages.git] / man3 / iswdigit.3

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-.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
-.\"
-.\" This is free documentation; you can redistribute it and/or
-.\" modify it under the terms of the GNU General Public License as
-.\" published by the Free Software Foundation; either version 2 of
-.\" the License, or (at your option) any later version.
-.\"
-.\" References consulted:
-.\"   GNU glibc-2 source code and manual
-.\"   Dinkumware C library reference http://www.dinkumware.com/
-.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
-.\"   ISO/IEC 9899:1999
-.\"
-.TH ISWDIGIT 3  1999-07-25 "GNU" "Linux Programmer's Manual"
-.SH NAME
-iswdigit \- test for decimal digit wide character
-.SH SYNOPSIS
-.nf
-.B #include <wctype.h>
-.sp
-.BI "int iswdigit(wint_t " wc );
-.fi
-.SH DESCRIPTION
-The \fBiswdigit\fP() function is the wide-character equivalent of the
-\fBisdigit\fP() function. It tests whether \fIwc\fP is a wide character
-belonging to the wide character class "digit".
-.PP
-The wide character class "digit" is a subclass of the wide character class
-"xdigit", and therefore also a subclass of the wide character class "alnum", of
-the wide character class "graph" and of the wide character class "print".
-.PP
-Being a subclass of the wide character class "print", the wide character class
-"digit" is disjoint from the wide character class "cntrl".
-.PP
-Being a subclass of the wide character class "graph", the wide character class
-"digit" is disjoint from the wide character class "space" and its subclass
-"blank".
-.PP
-Being a subclass of the wide character class "alnum", the wide character class
-"digit" is disjoint from the wide character class "punct".
-.PP
-The wide character class "digit" is disjoint from the wide character class
-"alpha" and therefore also disjoint from its subclasses "lower", "upper".
-.PP
-The wide character class "digit" always contains exactly the digits '0' to '9'.
-.SH "RETURN VALUE"
-The \fBiswdigit\fP() function returns non-zero if \fIwc\fP is a wide character
-belonging to the wide character class "digit". Otherwise it returns zero.
-.SH "CONFORMING TO"
-ISO/ANSI C, UNIX98
-.SH "SEE ALSO"
-.BR isdigit (3),
-.BR iswctype (3)
-.SH NOTES
-The behaviour of \fBiswdigit\fP() depends on the LC_CTYPE category of the
-current locale.