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* @Id: curs_util.3x,v 1.9 2002/09/01 19:44:37 tom Exp @
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<H1>curs_util 3x</H1>
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<PRE>
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</PRE>
<H2>NAME</H2><PRE>
<STRONG>delay_output</STRONG>, <STRONG>filter</STRONG>, <STRONG>flushinp</STRONG>, <STRONG>getwin</STRONG>, <STRONG>key_name</STRONG>, <STRONG>keyname</STRONG>,
<STRONG>putwin</STRONG>, <STRONG>unctrl</STRONG>, <STRONG>use_env</STRONG>, <STRONG>wunctrl</STRONG> - miscellaneous <STRONG>curses</STRONG>
utility routines
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>char</STRONG> <STRONG>*unctrl(chtype</STRONG> <STRONG>c);</STRONG>
<STRONG>char</STRONG> <STRONG>*wunctrl(wchar_t</STRONG> <STRONG>w);</STRONG>
<STRONG>char</STRONG> <STRONG>*keyname(int</STRONG> <STRONG>c);</STRONG>
<STRONG>char</STRONG> <STRONG>*key_name(wchar_t</STRONG> <STRONG>w);</STRONG>
<STRONG>void</STRONG> <STRONG>filter(void);</STRONG>
<STRONG>void</STRONG> <STRONG>use_env(bool</STRONG> <STRONG>f);</STRONG>
<STRONG>int</STRONG> <STRONG>putwin(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>FILE</STRONG> <STRONG>*filep);</STRONG>
<STRONG>WINDOW</STRONG> <STRONG>*getwin(FILE</STRONG> <STRONG>*filep);</STRONG>
<STRONG>int</STRONG> <STRONG>delay_output(int</STRONG> <STRONG>ms);</STRONG>
<STRONG>int</STRONG> <STRONG>flushinp(void);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <STRONG>unctrl</STRONG> routine returns a character string which is a
printable representation of the character <EM>c</EM>, ignoring
attributes. Control characters are displayed in the <STRONG>^</STRONG><EM>X</EM>
notation. Printing characters are displayed as is. The
corresponding <STRONG>wunctrl</STRONG> returns a printable representation
of a wide-character.
The <STRONG>keyname</STRONG> routine returns a character string correspond-
ing to the key <EM>c</EM>. Control characters are displayed in the
<STRONG>^</STRONG><EM>X</EM> notation. Values above 128 are either meta characters,
shown in the <STRONG>M-</STRONG><EM>X</EM> notation, or the names of function keys,
or null. The corresponding <STRONG>key_name</STRONG> returns a character
string corresponding to the wide-character value <EM>w</EM>. The
two functions do not return the same set of strings; the
latter returns null where the former would display a meta
character.
The <STRONG>filter</STRONG> routine, if used, must be called before <STRONG>initscr</STRONG>
or <STRONG>newterm</STRONG> are called. The effect is that, during those
calls, <STRONG>LINES</STRONG> is set to 1; the capabilities <STRONG>clear</STRONG>, <STRONG>cup</STRONG>,
<STRONG>cud</STRONG>, <STRONG>cud1</STRONG>, <STRONG>cuu1</STRONG>, <STRONG>cuu</STRONG>, <STRONG>vpa</STRONG> are disabled; and the <STRONG>home</STRONG>
string is set to the value of <STRONG>cr</STRONG>.
The <STRONG>use_env</STRONG> routine, if used, is called before <STRONG>initscr</STRONG> or
<STRONG>newterm</STRONG> are called. When called with <STRONG>FALSE</STRONG> as an argu-
ment, the values of <STRONG>lines</STRONG> and <STRONG>columns</STRONG> specified in the
<EM>terminfo</EM> database will be used, even if environment vari-
ables <STRONG>LINES</STRONG> and <STRONG>COLUMNS</STRONG> (used by default) are set, or if
<STRONG>curses</STRONG> is running in a window (in which case default
behavior would be to use the window size if <STRONG>LINES</STRONG> and
<STRONG>COLUMNS</STRONG> are not set).
The <STRONG>putwin</STRONG> routine writes all data associated with window
<EM>win</EM> into the file to which <EM>filep</EM> points. This information
can be later retrieved using the <STRONG>getwin</STRONG> function.
The <STRONG>getwin</STRONG> routine reads window related data stored in the
file by <STRONG>putwin</STRONG>. The routine then creates and initializes
a new window using that data. It returns a pointer to the
new window.
The <STRONG>delay_output</STRONG> routine inserts an <EM>ms</EM> millisecond pause
in output. This routine should not be used extensively
because padding characters are used rather than a CPU
pause.
The <STRONG>flushinp</STRONG> routine throws away any typeahead that has
been typed by the user and has not yet been read by the
program.
</PRE>
<H2>RETURN VALUE</H2><PRE>
Except for <STRONG>flushinp</STRONG>, routines that return an integer
return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4 specifies only "an
integer value other than <STRONG>ERR</STRONG>") upon successful completion.
<STRONG>flushinp</STRONG> always returns <STRONG>OK</STRONG>.
Routines that return pointers return <STRONG>NULL</STRONG> on error.
</PRE>
<H2>PORTABILITY</H2><PRE>
The XSI Curses standard, Issue 4 describes these func-
tions. It states that <STRONG>unctrl</STRONG> and <STRONG>wunctrl</STRONG> will return a
null pointer if unsuccessful, but does not define any
error conditions.
The SVr4 documentation describes the action of <STRONG>filter</STRONG> only
in the vaguest terms. The description here is adapted
from the XSI Curses standard (which erroneously fails to
describe the disabling of <STRONG>cuu</STRONG>).
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>.
</PRE>
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