wctype.html

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<A HREF="#wctype"><CODE>wctype</CODE></A>.</P>

<H2><A NAME="iswdigit"><CODE>iswdigit</CODE></A></H2>

<PRE>int <B>iswdigit</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>

<PRE>0 1 2 3 4 5 6 7 8 9</PRE>

<H2><A NAME="iswgraph"><CODE>iswgraph</CODE></A></H2>

<PRE>int <B>iswgraph</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE>
is any character for which either
<A HREF="#iswalnum"><CODE>iswalnum</CODE></A> or
<A HREF="#iswpunct"><CODE>iswpunct</CODE></A> returns nonzero.</P>

<H2><A NAME="iswlower"><CODE>iswlower</CODE></A></H2>

<PRE>int <B>iswlower</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>

<PRE>a b c d e f g h i j k l m n o p q r s t u v w x y z</PRE>

<P> or any other locale-specific lowercase character.</P>

<H2><A NAME="iswprint"><CODE>iswprint</CODE></A></H2>

<PRE>int <B>iswprint</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE>
is <CODE><I>space</I></CODE>, a character for which
<A HREF="#iswgraph"><CODE>iswgraph</CODE></A>
returns nonzero, or an implementation-defined
subset of the characters for which
<A HREF="#iswspace"><CODE>iswspace</CODE></A>
returns nonzero.</P>

<H2><A NAME="iswpunct"><CODE>iswpunct</CODE></A></H2>

<PRE>int <B>iswpunct</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>

<PRE>! " # % &amp; ' ( ) ; &lt;
= &gt; ? [ \ ] * + , -
. / : ^ _ { | } ~</PRE>

<P>or any other implementation-defined punctuation character.</P>

<H2><A NAME="iswspace"><CODE>iswspace</CODE></A></H2>

<PRE>int <B>iswspace</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>

<PRE><I>CR FF HT NL VT space</I></PRE>

<P>or any other locale-specific space character.</P>

<H2><A NAME="iswupper"><CODE>iswupper</CODE></A></H2>

<PRE>int <B>iswupper</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>

<PRE>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z</PRE>

<P>or any other locale-specific uppercase character.</P>

<H2><A NAME="iswxdigit"><CODE>iswxdigit</CODE></A></H2>

<PRE>int <B>iswxdigit</B>(wint_t c);</PRE>

<P>The function returns nonzero if <CODE>c</CODE> is any of</P>

<PRE>0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F</PRE>

<H2><A NAME="towctrans"><CODE>towctrans</CODE></A></H2>

<PRE>wint_t <B>towctrans</B>(wint_t c, wctrans_t category);</PRE>

<P>The function returns the transformation of the character <CODE>c</CODE>,
using the transform in the category <CODE>category</CODE>. The value of
<CODE>category</CODE> must have been returned
by an earlier successful call to
<A HREF="#wctrans"><CODE>wctrans</CODE></A>.</P>

<H2><A NAME="towlower"><CODE>towlower</CODE></A></H2>

<PRE>wint_t <B>towlower</B>(wint_t c);</PRE>

<P>The function returns the corresponding lowercase letter
if one exists and if
<CODE><A HREF="#iswupper">iswupper</A>(c)</CODE>;
otherwise, it returns <CODE>c</CODE>.</P>

<H2><A NAME="towupper"><CODE>towupper</CODE></A></H2>

<PRE>wint_t <B>towupper</B>(wint_t c);</PRE>

<P>The function returns the corresponding uppercase letter
if one exists and if
<CODE><A HREF="#iswlower">iswlower</A>(c)</CODE>;
otherwise, it returns <CODE>c</CODE>.</P>

<H2><A NAME="wctrans"><CODE>wctrans</CODE></A></H2>

<PRE>wctrans_t <B>wctrans</B>(const char *property);</PRE>

<P>The function determines a mapping from one set of wide-character
codes to another. If the
<A HREF="locale.html#LC_CTYPE"><CODE>LC_CTYPE</CODE></A>
category of the current
<A HREF="locale.html#locale">locale</A>
does not define a mapping whose name matches
the property string <CODE>property</CODE>, the function returns zero.
Otherwise, it returns a nonzero value suitable
for use as the second argument to a subsequent call to
<A HREF="#towctrans"><CODE>towctrans</CODE></A>.</P>

<P>The following pairs of calls have the same behavior in all
<A HREF="locale.html#locale">locales</A>
(but an implementation can define additional mappings even in the
<A HREF="locale.html#C locale"><CODE>"C"</CODE></A> locale):</P>

<PRE><A HREF="#towlower">towlower</A>(c) <B>same as</B> towctrans(c, wctrans("tolower"))
<A HREF="#towupper">towupper</A>(c) <B>same as</B> towctrans(c, wctrans("toupper"))</PRE>

<H2><A NAME="wctrans_t"><CODE>wctrans_t</CODE></A></H2>

<PRE>typedef <I>s_type</I> <B>wctrans_t</B>;</PRE>

<P>The type is the scalar type <CODE><I>s-type</I></CODE>
that can represent locale-specific character mappings,
as specified by the return value of
<A HREF="#wctrans"><CODE>wctrans</CODE></A>.</P>

<H2><A NAME="wctype"><CODE>wctype</CODE></A></H2>

<PRE>wctype_t <B>wctype</B>(const char *property);</PRE>

<PRE>wctrans_t wctrans(const char *property);</PRE>

<P>The function determines a classification rule
for wide-character codes. If the
<A HREF="locale.html#LC_CTYPE"><CODE>LC_CTYPE</CODE></A>
category of the current
<A HREF="locale.html#locale">locale</A>
does not define a classification rule whose name matches
the property string <CODE>property</CODE>, the function returns zero.
Otherwise, it returns a nonzero value suitable
for use as the second argument to a subsequent call to
<A HREF="#towctrans"><CODE>towctrans</CODE></A>.</P>

<P>The following pairs of calls have the same behavior in all
<A HREF="locale.html#locale">locales</A> (but an implementation
can define additional classification rules even in the
<A HREF="locale.html#C locale"><CODE>"C"</CODE></A> locale):</P>

<PRE><A HREF="#iswalnum">iswalnum</A>(c)  <B>same as</B> iswctype(c, wctype("alnum"))
<A HREF="#iswalpha">iswalpha</A>(c)  <B>same as</B> iswctype(c, wctype("alpha"))
<A HREF="#iswcntrl">iswcntrl</A>(c)  <B>same as</B> iswctype(c, wctype("cntrl"))
<A HREF="#iswdigit">iswdigit</A>(c)  <B>same as</B> iswctype(c, wctype("digit"))
<A HREF="#iswgraph">iswgraph</A>(c)  <B>same as</B> iswctype(c, wctype("graph"))
<A HREF="#iswlower">iswlower</A>(c)  <B>same as</B> iswctype(c, wctype("lower"))
<A HREF="#iswprint">iswprint</A>(c)  <B>same as</B> iswctype(c, wctype("print"))
<A HREF="#iswpunct">iswpunct</A>(c)  <B>same as</B> iswctype(c, wctype("punct"))
<A HREF="#iswspace">iswspace</A>(c)  <B>same as</B> iswctype(c, wctype("space"))
<A HREF="#iswupper">iswupper</A>(c)  <B>same as</B> iswctype(c, wctype("upper"))
<A HREF="#iswxdigit">iswxdigit</A>(c) <B>same as</B> iswctype(c, wctype("xdigit"))</PRE>

<H2><A NAME="wctype_t"><CODE>wctype_t</CODE></A></H2>

<PRE>typedef <I>s_type</I> <B>wctype_t</B>;</PRE>

<P>The type is the scalar type <CODE><I>s-type</I></CODE> that can represent
locale-specific character classifications,
as specified by the return value of
<A HREF="#wctype"><CODE>wctype</CODE></A>.</P>

<H2><A NAME="wint_t"><CODE>wint_t</CODE></A></H2>

<PRE>typedef <I>i_type</I> <B>wint_t</B>;</PRE>

<P>The type is the integer type <CODE><I>i_type</I></CODE>
that can represent all values of type
<A HREF="stddef.html#wchar_t"><CODE>wchar_t</CODE></A>
as well as the value of the macro
<A HREF="#WEOF"><CODE>WEOF</CODE></A>,
and that doesn't change when
<A HREF="express.html#Promoting">promoted</A>.</P>

<HR>
<P>See also the
<B><A HREF="index.html#Table of Contents">Table of Contents</A></B> and the
<B><A HREF="_index.html">Index</A></B>.</P>

<P><I>
<A HREF="crit_pb.html">Copyright</A> &#169; 1989-2002
by P.J. Plauger and Jim Brodie. All rights reserved.</I></P>

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