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- * @Id: curs_util.3x,v 1.11 2003/07/19 19:59:56 tom Exp @
+ * @Id: curs_util.3x,v 1.23 2007/02/24 15:59:07 tom Exp @
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<!-- Manpage converted by man2html 3.0.1 -->
-<STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG> <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>
+<STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG> <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>
</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
+ <STRONG>nofilter</STRONG>, <STRONG>putwin</STRONG>, <STRONG>unctrl</STRONG>, <STRONG>use_env</STRONG>, <STRONG>wunctrl</STRONG> - miscellaneous
+ <STRONG>curses</STRONG> utility routines
</PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>char</STRONG> <STRONG>*unctrl(chtype</STRONG> <STRONG>c);</STRONG>
- <STRONG>char</STRONG> <STRONG>*wunctrl(cchar_t</STRONG> <STRONG>*c);</STRONG>
+ <STRONG>wchar_t</STRONG> <STRONG>*wunctrl(cchar_t</STRONG> <STRONG>*c);</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>nofilter(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>
</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
+ printable representation of the character <EM>c</EM>, ignoring at-
+ tributes. Control characters are displayed in the <STRONG>^</STRONG><EM>X</EM> no-
+ tation. Printing characters are displayed as is. The
corresponding <STRONG>wunctrl</STRONG> returns a printable representation
of a wide-character.
<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>nofilter</STRONG> routine cancels the effect of a preceding
+ <STRONG>filter</STRONG> call. That allows the caller to initialize a
+ screen on a different device, using a different value of
+ <STRONG>$TERM</STRONG>. The limitation arises because the <STRONG>filter</STRONG> routine
+ modifies the in-memory copy of the terminal information.
+
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).
+ <STRONG>curses</STRONG> is running in a window (in which case default be-
+ havior would be to use the window size if <STRONG>LINES</STRONG> and
+ <STRONG>COLUMNS</STRONG> are not set). Note that setting <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG>
+ overrides the corresponding size which may be obtained
+ from the operating system.
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
</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>.
+ Except for <STRONG>flushinp</STRONG>, routines that return an integer re-
+ turn <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4 specifies only "an in-
+ teger value other than <STRONG>ERR</STRONG>") upon successful completion.
Routines that return pointers return <STRONG>NULL</STRONG> on error.
+ X/Open does not define any error conditions. In this im-
+ plementation
+
+ <STRONG>flushinp</STRONG>
+ returns an error if the terminal was not ini-
+ tialized.
+
+ <STRONG>putwin</STRONG>
+ returns an error if the associated <STRONG>fwrite</STRONG>
+ calls return an 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.
+ null pointer if unsuccessful, but does not define any er-
+ ror 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>).
+ The strings returned by <STRONG>unctrl</STRONG> in this implementation are
+ determined at compile time, showing C1 controls from the
+ upper-128 codes with a `~' prefix rather than `^'. Other
+ implementations have different conventions. For example,
+ they may show both sets of control characters with `^',
+ and strip the parameter to 7 bits. Or they may ignore C1
+ controls and treat all of the upper-1280 codes as print-
+ able. This implementation uses 8 bits but does not modify
+ the string to reflect locale. The <STRONG>use_legacy_coding</STRONG> func-
+ tion allows the caller to change the output of <STRONG>unctrl</STRONG>.
+
+ The <STRONG>keyname</STRONG> function may return the names of user-defined
+ string capabilities which are defined in the terminfo en-
+ try via the <STRONG>-x</STRONG> option of <STRONG>tic</STRONG>. This implementation auto-
+ matically assigns at run-time keycodes to user-defined
+ strings which begin with "k". The keycodes start at
+ KEY_MAX, but are not guaranteed to be the same value for
+ different runs because user-defined codes are merged from
+ all terminal descriptions which have been loaded.
+
+ The <STRONG>nofilter</STRONG> routine is specific to ncurses. It was not
+ supported on Version 7, BSD or System V implementations.
+ It is recommended that any code depending on ncurses ex-
+ tensions be conditioned using NCURSES_VERSION.
+
</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_kernel.3x.html">curs_kernel(3x)</A></STRONG>,
- <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>.
+ <STRONG><A HREF="legacy_coding.3x.html">legacy_coding(3x)</A></STRONG>, <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG>curs_ker-</STRONG>
+ <STRONG><A HREF="curs_kernel.3x.html">nel(3x)</A></STRONG>, <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>.
- <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>
+ <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>
</PRE>
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