463 lines
17 KiB
HTML
463 lines
17 KiB
HTML
<HTML><HEAD><TITLE><wctype.h></TITLE></HEAD><BODY BGCOLOR="#FFFFFF">
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<H1><A NAME="<wctype.h>"><CODE><wctype.h></CODE></A>
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[Added with
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<A HREF="lib_over.html#Amendment 1" tppabs="http://ccs.ucsd.edu/c/lib_over.html#Amendment 1">Amendment 1</A>]</H1><HR>
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<P><CODE>
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int <A HREF="#iswalnum"><B>iswalnum</B></A>(wint_t c);<BR>
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int <A HREF="#iswalpha"><B>iswalpha</B></A>(wint_t c);<BR>
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int <A HREF="#iswcntrl"><B>iswcntrl</B></A>(wint_t c);<BR>
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int <A HREF="#iswctype"><B>iswctype</B></A>(wint_t c,
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wctype_t category);<BR>
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int <A HREF="#iswdigit"><B>iswdigit</B></A>(wint_t c);<BR>
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int <A HREF="#iswgraph"><B>iswgraph</B></A>(wint_t c);<BR>
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int <A HREF="#iswlower"><B>iswlower</B></A>(wint_t c);<BR>
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int <A HREF="#iswprint"><B>iswprint</B></A>(wint_t c);<BR>
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int <A HREF="#iswpunct"><B>iswpunct</B></A>(wint_t c);<BR>
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int <A HREF="#iswspace"><B>iswspace</B></A>(wint_t c);<BR>
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int <A HREF="#iswupper"><B>iswupper</B></A>(wint_t c);<BR>
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int <A HREF="#iswxdigit"><B>iswxdigit</B></A>(wint_t c);<BR>
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wint_t <A HREF="#towctrans"><B>towctrans</B></A>(wint_t c,
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wctrans_t category);<BR>
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wint_t <A HREF="#towlower"><B>towlower</B></A>(wint_t c);<BR>
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wint_t <A HREF="#towupper"><B>towupper</B></A>(wint_t c);<BR>
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wctrans_t <A HREF="#wctrans"><B>wctrans</B></A>(const
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char *property);<BR>
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typedef <I>s_type</I>
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<A HREF="#wctrans_t"><B>wctrans_t</B></A>;<BR>
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wctype_t <A HREF="#wctype"><B>wctype</B></A>(const
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char *property);<BR>
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typedef
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<I>s_type</I> <A HREF="#wctype_t"><B>wctype_t</B></A>;<BR>
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typedef <I>i_type</I> <A HREF="#wint_t"><B>wint_t</B></A>;<BR>
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</CODE></P>
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<P>Include the standard header <B><CODE><wctype.h></CODE></B>
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to declare several functions that are useful
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for classifying and mapping codes from the target wide-character set.</P>
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<P>Every function that has a parameter of type
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<A HREF="#wint_t"><CODE>wint_t</CODE></A>
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can accept the value of the macro
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<A HREF="#WEOF"><CODE>WEOF</CODE></A>
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or any valid wide-character code (of type
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<A HREF="stddef.html#wchar_t" tppabs="http://ccs.ucsd.edu/c/stddef.html#wchar_t"><CODE>wchar_t</CODE></A>).
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Thus, the argument can be the value returned by any of the functions:
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<A HREF="wchar.html#btowc" tppabs="http://ccs.ucsd.edu/c/wchar.html#btowc"><CODE>btowc</CODE></A>,
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<A HREF="wchar.html#fgetwc" tppabs="http://ccs.ucsd.edu/c/wchar.html#fgetwc"><CODE>fgetwc</CODE></A>,
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<A HREF="wchar.html#fputwc" tppabs="http://ccs.ucsd.edu/c/wchar.html#fputwc"><CODE>fputwc</CODE></A>,
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<A HREF="wchar.html#getwc" tppabs="http://ccs.ucsd.edu/c/wchar.html#getwc"><CODE>getwc</CODE></A>,
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<A HREF="wchar.html#getwchar" tppabs="http://ccs.ucsd.edu/c/wchar.html#getwchar"><CODE>getwchar</CODE></A>,
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<A HREF="wchar.html#putwc" tppabs="http://ccs.ucsd.edu/c/wchar.html#putwc"><CODE>putwc</CODE></A>,
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<A HREF="wchar.html#putwchar" tppabs="http://ccs.ucsd.edu/c/wchar.html#putwchar"><CODE>putwchar</CODE></A>,
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<A HREF="#towctrans"><CODE>towctrans</CODE></A>,
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<A HREF="#towlower"><CODE>towlower</CODE></A>,
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<A HREF="#towupper"><CODE>towupper</CODE></A>, or
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<A HREF="wchar.html#ungetwc" tppabs="http://ccs.ucsd.edu/c/wchar.html#ungetwc"><CODE>ungetwc</CODE></A>.
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You must not call these functions
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with other wide-character argument values.</P>
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<P>The
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<B><A NAME="wide-character classification">
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wide-character classification</A></B>
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functions are strongly related to the (byte)
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<A HREF="ctype.html#character classification" tppabs="http://ccs.ucsd.edu/c/ctype.html#character classification">character classification</A>
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functions. Each function <CODE>is<I>XXX</I></CODE>
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has a corresponding wide-character classification
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function <CODE>isw<I>XXX</I></CODE>.
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Moreover, the wide-character classification functions
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are interrelated much the same way as their corresponding
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byte functions, with two added provisos:</P>
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<UL>
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<LI>The function
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<A HREF="#iswprint"><CODE>iswprint</CODE></A>, unlike
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<A HREF="ctype.html#isprint" tppabs="http://ccs.ucsd.edu/c/ctype.html#isprint"><CODE>isprint</CODE></A>,
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can return a nonzero value for additional space characters
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besides the wide-character equivalent of <CODE><I>space</I></CODE>
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(<CODE>L' '</CODE>). Any such additional characters
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return a nonzero value for
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<A HREF="#iswspace"><CODE>iswspace</CODE></A> and return zero for
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<A HREF="#iswgraph"><CODE>iswgraph</CODE></A> or
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<A HREF="#iswpunct"><CODE>iswpunct</CODE></A>.
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<LI>The characters in each wide-character class are a superset of
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the characters in the corresponding byte class.
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If the call <CODE>is<I>XXX</I>(c)</CODE> returns a nonzero value,
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then the corresponding call <CODE>isw<I>XXX</I>(btowc(c))</CODE>
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also returns a nonzero value.
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</UL>
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<P>An implementation can define additional characters that return
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nonzero for some of these functions. Any character set can contain
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additional characters that return nonzero for:</P>
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<UL>
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<LI><A HREF="#iswpunct"><CODE>iswpunct</CODE></A>
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(provided the characters cause
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<A HREF="#iswalnum"><CODE>iswalnum</CODE></A> to return zero)
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<LI><A HREF="#iswcntrl"><CODE>iswcntrl</CODE></A>
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(provided the characters cause
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<A HREF="#iswprint"><CODE>iswprint</CODE></A> to return zero)
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</UL>
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<P>Moreover, a
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locale</A> other than the
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<A HREF="locale.html#C locale" tppabs="http://ccs.ucsd.edu/c/locale.html#C locale"><CODE>"C"</CODE></A> locale can define
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additional characters for:</P>
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<UL>
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<LI><A HREF="#iswalpha"><CODE>iswalpha</CODE></A>,
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<A HREF="#iswupper"><CODE>iswupper</CODE></A>, and
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<A HREF="#iswlower"><CODE>iswlower</CODE></A>
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(provided the characters cause
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<A HREF="#iswcntrl"><CODE>iswcntrl</CODE></A>,
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<A HREF="#iswdigit"><CODE>iswdigit</CODE></A>,
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<A HREF="#iswpunct"><CODE>iswpunct</CODE></A>, and
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<A HREF="#iswspace"><CODE>iswspace</CODE></A> to return zero)
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<LI><A HREF="#iswspace"><CODE>iswspace</CODE></A>
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(provided the characters cause
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<A HREF="#iswpunct"><CODE>iswpunct</CODE></A> to return zero)
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</UL>
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<P>Note that the last rule differs slightly from the corresponding
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rule for the function
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<A HREF="ctype.html#isspace" tppabs="http://ccs.ucsd.edu/c/ctype.html#isspace"><CODE>isspace</CODE></A>,
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as indicated above.
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Note also that an implementation can define a
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locale</A> other than the
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<A HREF="locale.html#C locale" tppabs="http://ccs.ucsd.edu/c/locale.html#C locale"><CODE>"C"</CODE></A> locale
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in which a character can cause
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<A HREF="#iswalpha"><CODE>iswalpha</CODE></A> (and hence
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<A HREF="#iswalnum"><CODE>iswalnum</CODE></A>)
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to return nonzero, yet still cause
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<A HREF="#iswupper"><CODE>iswupper</CODE></A> and
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<A HREF="#iswlower"><CODE>iswlower</CODE></A> to return zero.</P>
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<H2><A NAME="WEOF"><CODE>WEOF</CODE></A></H2>
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<P><CODE>
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#define <B>WEOF</B> <I><</I>wint_t <I>constant expression></I>
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</CODE></P>
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<P>The macro yields the return value, of type
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<A HREF="#wint_t"><CODE>wint_t</CODE></A>,
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used to signal the end of a
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<A HREF="lib_file.html#wide stream" tppabs="http://ccs.ucsd.edu/c/lib_file.html#wide stream">wide stream</A>
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or to report an error condition.</P>
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<H2><A NAME="iswalnum"><CODE>iswalnum</CODE></A></H2>
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<P><CODE>
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int <B>iswalnum</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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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
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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
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o 1 2 3 4 5 6 7 8 9</PRE>
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<P> or any other locale-specific alphabetic character.</P>
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<H2><A NAME="iswalpha"><CODE>iswalpha</CODE></A></H2>
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<P><CODE>
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int <B>iswalpha</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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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
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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>
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<P> or any other locale-specific alphabetic character.</P>
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<H2><A NAME="iswcntrl"><CODE>iswcntrl</CODE></A></H2>
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<P><CODE>
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int <B>iswcntrl</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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<I>BEL BS CR FF HT NL VT</I></PRE>
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<P>or any other implementation-defined control character.</P>
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<H2><A NAME="iswctype"><CODE>iswctype</CODE></A></H2>
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<P><CODE>
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int <B>iswctype</B>(wint_t c, wctype_t category);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any character in
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the category <CODE>category</CODE>.
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The value of <CODE>category</CODE> must have
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been returned by an earlier successful call to
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<A HREF="#wctype"><CODE>wctype</CODE></A>.</P>
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<H2><A NAME="iswdigit"><CODE>iswdigit</CODE></A></H2>
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<P><CODE>
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int <B>iswdigit</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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0 1 2 3 4 5 6 7 8 9</PRE>
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<H2><A NAME="iswgraph"><CODE>iswgraph</CODE></A></H2>
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<P><CODE>
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int <B>iswgraph</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE>
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is any character for which either
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<A HREF="#iswalnum"><CODE>iswalnum</CODE></A> or
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<A HREF="#iswpunct"><CODE>iswpunct</CODE></A> returns nonzero.</P>
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<H2><A NAME="iswlower"><CODE>iswlower</CODE></A></H2>
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<P><CODE>
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int <B>iswlower</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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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>
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<P> or any other locale-specific lowercase character.</P>
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<H2><A NAME="iswprint"><CODE>iswprint</CODE></A></H2>
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<P><CODE>
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int <B>iswprint</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE>
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is <CODE><I>space</I></CODE>, a character for which
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<A HREF="#iswgraph"><CODE>iswgraph</CODE></A>
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returns nonzero, or an implementation-defined
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subset of the characters for which
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<A HREF="#iswspace"><CODE>iswspace</CODE></A>
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returns nonzero.</P>
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<H2><A NAME="iswpunct"><CODE>iswpunct</CODE></A></H2>
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<P><CODE>
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int <B>iswpunct</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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! " # % & ' ( ) ; <
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= > ? [ \ ] * + , -
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. / : ^ _ { | } ~</PRE>
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<P>or any other implementation-defined punctuation character.</P>
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<H2><A NAME="iswspace"><CODE>iswspace</CODE></A></H2>
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<P><CODE>
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int <B>iswspace</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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<I>CR FF HT NL VT space</I></PRE>
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<P>or any other locale-specific space character.</P>
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<H2><A NAME="iswupper"><CODE>iswupper</CODE></A></H2>
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<P><CODE>
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int <B>iswupper</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of:</P>
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<PRE>
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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>
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<P>or any other locale-specific uppercase character.</P>
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<H2><A NAME="iswxdigit"><CODE>iswxdigit</CODE></A></H2>
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<P><CODE>
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int <B>iswxdigit</B>(wint_t c);
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</CODE></P>
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<P>The function returns nonzero if <CODE>c</CODE> is any of</P>
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<PRE>
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0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F</PRE>
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<H2><A NAME="towctrans"><CODE>towctrans</CODE></A></H2>
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<P><CODE>
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wint_t <B>towctrans</B>(wint_t c, wctrans_t category);
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</CODE></P>
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<P>The function returns the transformation of the character <CODE>c</CODE>,
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using the transform in the category <CODE>category</CODE>. The value of
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<CODE>category</CODE> must have been returned
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by an earlier successful call to
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<A HREF="#wctrans"><CODE>wctrans</CODE></A>.</P>
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<H2><A NAME="towlower"><CODE>towlower</CODE></A></H2>
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<P><CODE>
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wint_t <B>towlower</B>(wint_t c);
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</CODE></P>
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<P>The function returns the corresponding lowercase letter
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if one exists and if
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<CODE><A HREF="#iswupper">iswupper</A>(c)</CODE>;
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otherwise, it returns <CODE>c</CODE>.</P>
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<H2><A NAME="towupper"><CODE>towupper</CODE></A></H2>
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<P><CODE>
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wint_t <B>towupper</B>(wint_t c);
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</CODE></P>
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<P>The function returns the corresponding uppercase letter
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if one exists and if
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<CODE><A HREF="#iswlower">iswlower</A>(c)</CODE>;
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otherwise, it returns <CODE>c</CODE>.</P>
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<H2><A NAME="wctrans"><CODE>wctrans</CODE></A></H2>
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<P><CODE>
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wctrans_t <B>wctrans</B>(const char *property);
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</CODE></P>
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<P>The function determines a mapping from one set of wide-character
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codes to another. If the
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<A HREF="locale.html#LC_CTYPE" tppabs="http://ccs.ucsd.edu/c/locale.html#LC_CTYPE"><CODE>LC_CTYPE</CODE></A>
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category of the current
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locale</A>
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does not define a mapping whose name matches
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the property string <CODE>property</CODE>, the function returns zero.
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Otherwise, it returns a nonzero value suitable
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for use as the second argument to a subsequent call to
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<A HREF="#towctrans"><CODE>towctrans</CODE></A>.</P>
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<P>The following pairs of calls have the same behavior in all
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locales</A>
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(but an implementation can define additional mappings even in the
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<A HREF="locale.html#C locale" tppabs="http://ccs.ucsd.edu/c/locale.html#C locale"><CODE>"C"</CODE></A> locale):</P>
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<P><CODE><A HREF="#towlower">towlower</A>(c) <B>same as</B>
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<A HREF="#towctrans">towctrans</A>(c, wctrans("tolower"))<BR>
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<A HREF="#towupper">towupper</A>(c) <B>same as</B>
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<A HREF="#towctrans">towctrans</A>(c,
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wctrans("toupper"))</CODE></P>
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<H2><A NAME="wctrans_t"><CODE>wctrans_t</CODE></A></H2>
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<P><CODE>
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typedef <I>s_type</I> <B>wctrans_t</B>;
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</CODE></P>
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<P>The type is the scalar type <CODE><I>s-type</I></CODE>
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that can represent locale-specific character mappings,
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as specified by the return value of
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<A HREF="#wctrans"><CODE>wctrans</CODE></A>.</P>
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<H2><A NAME="wctype"><CODE>wctype</CODE></A></H2>
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<P><CODE>
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wctype_t <B>wctype</B>(const char *property);
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</CODE></P>
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<P><CODE>
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wctrans_t wctrans(const char *property);
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<P>The function determines a classification rule
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for wide-character codes. If the
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<A HREF="locale.html#LC_CTYPE" tppabs="http://ccs.ucsd.edu/c/locale.html#LC_CTYPE"><CODE>LC_CTYPE</CODE></A>
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category of the current
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locale</A>
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does not define a classification rule whose name matches
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the property string <CODE>property</CODE>, the function returns zero.
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Otherwise, it returns a nonzero value suitable
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for use as the second argument to a subsequent call to
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<A HREF="#towctrans"><CODE>towctrans</CODE></A>.</P>
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<P>The following pairs of calls have the same behavior in all
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<A HREF="locale.html#locale" tppabs="http://ccs.ucsd.edu/c/locale.html#locale">locales</A> (but an implementation
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can define additional classification rules even in the
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<A HREF="locale.html#C locale" tppabs="http://ccs.ucsd.edu/c/locale.html#C locale"><CODE>"C"</CODE></A> locale):</P>
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<P><CODE><A HREF="#iswalnum">iswalnum</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("alnum"))<BR>
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<A HREF="#iswalpha">iswalpha</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("alpha"))<BR>
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<A HREF="#iswcntrl">iswcntrl</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("cntrl"))<BR>
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<A HREF="#iswdigit">iswdigit</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("digit"))<BR>
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<A HREF="#iswgraph">iswgraph</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("graph"))<BR>
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<A HREF="#iswlower">iswlower</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("lower"))<BR>
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<A HREF="#iswprint">iswprint</A>(c) <B>same as</B>
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<A HREF="#iswctype">iswctype</A>(c, wctype("print"))<BR>
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<A HREF="#iswpunct">iswpunct</A>(c) <B>same as</B>
|
|
<A HREF="#iswctype">iswctype</A>(c, wctype("punct"))<BR>
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<A HREF="#iswspace">iswspace</A>(c) <B>same as</B>
|
|
<A HREF="#iswctype">iswctype</A>(c, wctype("space"))<BR>
|
|
<A HREF="#iswupper">iswupper</A>(c) <B>same as</B>
|
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<A HREF="#iswctype">iswctype</A>(c, wctype("upper"))<BR>
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<A HREF="#iswxdigit">iswxdigit</A>(c) <B>same as</B>
|
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<A HREF="#iswctype">iswctype</A>(c, wctype("xdigit"))</CODE></P>
|
|
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<H2><A NAME="wctype_t"><CODE>wctype_t</CODE></A></H2>
|
|
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<P><CODE>
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typedef <I>s_type</I> <B>wctype_t</B>;
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|
</CODE></P>
|
|
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|
<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
|
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<A HREF="#wctype"><CODE>wctype</CODE></A>.</P>
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|
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|
<H2><A NAME="wint_t"><CODE>wint_t</CODE></A></H2>
|
|
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|
<P><CODE>
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|
typedef <I>i_type</I> <B>wint_t</B>;
|
|
</CODE></P>
|
|
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|
<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" tppabs="http://ccs.ucsd.edu/c/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" tppabs="http://ccs.ucsd.edu/c/express.html#Promoting">promoted</A>.</P>
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|
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<HR>
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|
<P>See also the
|
|
<B><A HREF="index.html#Table of Contents" tppabs="http://ccs.ucsd.edu/c/index.html#Table of Contents">Table of Contents</A></B> and the
|
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<B><A HREF="_index.html" tppabs="http://ccs.ucsd.edu/c/_index.html">Index</A></B>.</P>
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<P><I>
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<A HREF="crit_pb.html" tppabs="http://ccs.ucsd.edu/c/crit_pb.html">Copyright</A> © 1989-1996
|
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by P.J. Plauger and Jim Brodie. All rights reserved.</I></P>
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</BODY></HTML>
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