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-<H1>curs_util 3x</H1>
-<HR>
+<H1 class="no-header">curs_util 3x</H1>
<PRE>
-<!-- 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>
-</PRE>
-<H2>NAME</H2><PRE>
+</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>delay_output</STRONG>, <STRONG>filter</STRONG>, <STRONG>flushinp</STRONG>, <STRONG>getwin</STRONG>, <STRONG>key_name</STRONG>, <STRONG>keyname</STRONG>,
- <STRONG>nofilter</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>use_tioctl</STRONG>, <STRONG>wunctrl</STRONG> -
+ miscellaneous <STRONG>curses</STRONG> utility routines
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>char</STRONG> <STRONG>*unctrl(chtype</STRONG> <STRONG>c);</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>void</STRONG> <STRONG>use_tioctl(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>
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+
+</PRE><H3><a name="h3-unctrl">unctrl</a></H3><PRE>
The <STRONG>unctrl</STRONG> routine returns a character string which is a
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.
+ of a wide character.
+
+</PRE><H3><a name="h3-keyname_key_name">keyname/key_name</a></H3><PRE>
The <STRONG>keyname</STRONG> routine returns a character string correspond-
ing to the key <EM>c</EM>:
- - Printable characters are displayed as themselves,
- e.g., a one-character string containing the key.
+ <STRONG>o</STRONG> Printable characters are displayed as themselves,
+ e.g., a one-character string containing the key.
- - Control characters are displayed in the <STRONG>^</STRONG><EM>X</EM> notation.
+ <STRONG>o</STRONG> Control characters are displayed in the <STRONG>^</STRONG><EM>X</EM> notation.
- - DEL (character 127) is displayed as <STRONG>^?</STRONG>.
+ <STRONG>o</STRONG> DEL (character 127) is displayed as <STRONG>^?</STRONG>.
- - Values above 128 are either meta characters (if the
- screen has not been initialized, or if <STRONG>meta</STRONG> has been
- called with a TRUE parameter), shown in the <STRONG>M-</STRONG><EM>X</EM> no-
- tation, or are displayed as themselves. In the lat-
- ter case, the values may not be printable; this fol-
- lows the X/Open specification.
+ <STRONG>o</STRONG> Values above 128 are either meta characters (if the
+ screen has not been initialized, or if <STRONG>meta</STRONG> has been
+ called with a <STRONG>TRUE</STRONG> parameter), shown in the <STRONG>M-</STRONG><EM>X</EM> nota-
+ tion, or are displayed as themselves. In the latter
+ case, the values may not be printable; this follows
+ the X/Open specification.
- - Values above 256 may be the names of the names of
- function keys.
+ <STRONG>o</STRONG> Values above 256 may be the names of the names of
+ function keys.
- - Otherwise (if there is no corresponding name) the
- function returns null, to denote an error. X/Open
- also lists an "UNKNOWN KEY" return value, which some
- implementations return rather than null.
+ <STRONG>o</STRONG> Otherwise (if there is no corresponding name) the
+ function returns null, to denote an error. X/Open al-
+ so lists an "UNKNOWN KEY" return value, which some im-
+ plementations return rather than null.
The corresponding <STRONG>key_name</STRONG> returns a character string cor-
responding to the wide-character value <EM>w</EM>. The two func-
returns null where the former would display a meta charac-
ter.
+
+</PRE><H3><a name="h3-filter_nofilter">filter/nofilter</a></H3><PRE>
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>$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 be-
- havior would be to use the window size if <STRONG>LINES</STRONG> and <STRONG>COL-</STRONG>
- <STRONG>UMNS</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.
+</PRE><H3><a name="h3-use_env">use_env</a></H3><PRE>
+ The <STRONG>use_env</STRONG> routine, if used, should be called before
+ <STRONG>initscr</STRONG> or <STRONG>newterm</STRONG> are called (because those compute the
+ screen size). It modifies the way <STRONG>ncurses</STRONG> treats environ-
+ ment variables when determining the screen size.
+
+ <STRONG>o</STRONG> Normally ncurses looks first at the terminal database
+ for the screen size.
+
+ If <STRONG>use_env</STRONG> was called with <STRONG>FALSE</STRONG> for parameter, it
+ stops here unless If <STRONG>use_tioctl</STRONG> was also called with
+ <STRONG>TRUE</STRONG> for parameter.
+
+ <STRONG>o</STRONG> Then it asks for the screen size via operating system
+ calls. If successful, it overrides the values from
+ the terminal database.
+
+ <STRONG>o</STRONG> Finally (unless <STRONG>use_env</STRONG> was called with <STRONG>FALSE</STRONG> parame-
+ ter), ncurses examines the <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> environ-
+ ment variables, using a value in those to override the
+ results from the operating system or terminal data-
+ base.
+
+ Ncurses also updates the screen size in response to
+ SIGWINCH, unless overridden by the <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG>
+ environment variables,
+
+
+</PRE><H3><a name="h3-use_tioctl">use_tioctl</a></H3><PRE>
+ The <STRONG>use_tioctl</STRONG> routine, if used, should be called before
+ <STRONG>initscr</STRONG> or <STRONG>newterm</STRONG> are called (because those compute the
+ screen size). After <STRONG>use_tioctl</STRONG> is called with <STRONG>TRUE</STRONG> as an
+ argument, ncurses modifies the last step in its computa-
+ tion of screen size as follows:
+
+ <STRONG>o</STRONG> checks if the <STRONG>LINES</STRONG> and <STRONG>COLUMNS</STRONG> environment variables
+ are set to a number greater than zero.
+
+ <STRONG>o</STRONG> for each, ncurses updates the corresponding environ-
+ ment variable with the value that it has obtained via
+ operating system call or from the terminal database.
+
+ <STRONG>o</STRONG> ncurses re-fetches the value of the environment vari-
+ ables so that it is still the environment variables
+ which set the screen size.
+
+ The <STRONG>use_env</STRONG> and <STRONG>use_tioctl</STRONG> routines combine as summarized
+ here:
+
+ <EM>use</EM><STRONG>_</STRONG><EM>env</EM> <EM>use</EM><STRONG>_</STRONG><EM>tioctl</EM> <EM>Summary</EM>
+ ----------------------------------------------------------------
+
+
+
+ TRUE FALSE This is the default behavior. ncurses
+ uses operating system calls unless over-
+ ridden by $LINES or $COLUMNS environment
+ variables.
+ TRUE TRUE ncurses updates $LINES and $COLUMNS
+ based on operating system calls.
+ FALSE TRUE ncurses ignores $LINES and $COLUMNS, us-
+ es operating system calls to obtain
+ size.
+ FALSE FALSE ncurses relies on the terminal database
+ to determine size.
+
+
+</PRE><H3><a name="h3-putwin_getwin">putwin/getwin</a></H3><PRE>
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.
+ (or pad) <EM>win</EM> into the file to which <EM>filep</EM> points. This
+ information can be later retrieved using the <STRONG>getwin</STRONG> func-
+ tion.
The <STRONG>getwin</STRONG> routine reads window related data stored in the
- file by <STRONG>putwin</STRONG>. The routine then creates and initializes
+ 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.
+ new window. There are a few caveats:
+
+ <STRONG>o</STRONG> the data written is a copy of the <STRONG>WINDOW</STRONG> structure,
+ and its associated character cells. The format dif-
+ fers between the wide-character (ncursesw) and non-
+ wide (ncurses) libraries. You can transfer data be-
+ tween the two, however.
+
+ <STRONG>o</STRONG> the retrieved window is always created as a top-level
+ window (or pad), rather than a subwindow.
+ <STRONG>o</STRONG> the window's character cells contain the color pair
+ <EM>value</EM>, but not the actual color <EM>numbers</EM>. If cells in
+ the retrieved window use color pairs which have not
+ been created in the application using <STRONG>init_pair</STRONG>, they
+ will not be colored when the window is refreshed.
+
+
+</PRE><H3><a name="h3-delay_output">delay_output</a></H3><PRE>
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. If no padding character is specified, this uses
<STRONG>napms</STRONG> to perform the delay.
+
+</PRE><H3><a name="h3-flushinp">flushinp</a></H3><PRE>
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>
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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.
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 er-
- ror conditions. This implementation checks for three cas-
- es:
-
- - the parameter is a 7-bit US-ASCII code. This
- is the case that X/Open Curses documented.
-
- - the parameter is in the range 128-159, i.e., a
- C1 control code. If <STRONG>use_legacy_coding</STRONG> has
- been called with a <STRONG>2</STRONG> parameter, <STRONG>unctrl</STRONG> returns
- the parameter, i.e., a one-character string
- with the parameter as the first character.
- Otherwise, it returns ``~@'', ``~A'', etc.,
- analogous to ``^@'', ``^A'', C0 controls.
-
- X/Open Curses does not document whether <STRONG>unctrl</STRONG>
- can be called before initializing curses.
- This implementation permits that, and returns
- the ``~@'', etc., values in that case.
-
- - parameter values outside the 0 to 255 range.
- <STRONG>unctrl</STRONG> returns a null pointer.
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+</PRE><H3><a name="h3-filter">filter</a></H3><PRE>
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
+ 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-128 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>.
-
- Likewise, the <STRONG>meta</STRONG> function allows the caller to change
- the output of <STRONG>keyname</STRONG>, i.e., it determines whether to use
- the `M-' prefix for ``meta'' keys (codes in the range 128
- to 255). Both <STRONG>use_legacy_coding</STRONG> and <STRONG>meta</STRONG> succeed only af-
- ter curses is initialized. X/Open Curses does not docu-
- ment the treatment of codes 128 to 159. When treating
- them as ``meta'' keys (or if <STRONG>keyname</STRONG> is called before ini-
- tializing curses), this implementation returns strings
- ``M-^@'', ``M-^A'', etc.
+</PRE><H3><a name="h3-keyname">keyname</a></H3><PRE>
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-
loaded when the terminal description is read by the li-
brary.
- 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><H3><a name="h3-nofilter_use_tioctl">nofilter/use_tioctl</a></H3><PRE>
+ The <STRONG>nofilter</STRONG> and <STRONG>use_tioctl</STRONG> routines are specific to
+ ncurses. They were not supported on Version 7, BSD or
+ System V implementations. It is recommended that any code
+ depending on ncurses extensions be conditioned using
+ NCURSES_VERSION.
+
+
+</PRE><H3><a name="h3-putwin_getwin">putwin/getwin</a></H3><PRE>
+ The <STRONG>putwin</STRONG> and <STRONG>getwin</STRONG> functions have several issues with
+ portability:
+
+ <STRONG>o</STRONG> The files written and read by these functions use an
+ implementation-specific format. Although the format
+ is an obvious target for standardization, it has been
+ overlooked.
+
+ Interestingly enough, according to the copyright dates
+ in Solaris source, the functions (along with <STRONG>scr_init</STRONG>,
+ etc.) originated with the University of California,
+ Berkeley (in 1982) and were later (in 1988) incorpo-
+ rated into SVr4. Oddly, there are no such functions
+ in the 4.3BSD curses sources.
+
+ <STRONG>o</STRONG> Most implementations simply dump the binary <STRONG>WINDOW</STRONG>
+ structure to the file. These include SVr4 curses,
+ NetBSD and PDCurses, as well as older ncurses ver-
+ sions. This implementation (as well as the X/Open
+ variant of Solaris curses, dated 1995) uses textual
+ dumps.
+
+ The implementations which use binary dumps use block-
+ I/O (the <STRONG>fwrite</STRONG> and <STRONG>fread</STRONG> functions). Those that use
+ textual dumps use buffered-I/O. A few applications
+ may happen to write extra data in the file using these
+ functions. Doing that can run into problems mixing
+ block- and buffered-I/O. This implementation reduces
+ the problem on writes by flushing the output. Howev-
+ er, reading from a file written using mixed schemes
+ may not be successful.
+
+
+</PRE><H3><a name="h3-unctrl_wunctrl">unctrl/wunctrl</a></H3><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 er-
+ ror conditions. This implementation checks for three cas-
+ es:
-</PRE>
-<H2>SEE ALSO</H2><PRE>
+ <STRONG>o</STRONG> the parameter is a 7-bit US-ASCII code. This is the
+ case that X/Open Curses documented.
+
+ <STRONG>o</STRONG> the parameter is in the range 128-159, i.e., a C1 con-
+ trol code. If <STRONG>use_legacy_coding</STRONG> has been called with
+ a <STRONG>2</STRONG> parameter, <STRONG>unctrl</STRONG> returns the parameter, i.e., a
+ one-character string with the parameter as the first
+ character. Otherwise, it returns "~@", "~A", etc.,
+ analogous to "^@", "^A", C0 controls.
+
+ X/Open Curses does not document whether <STRONG>unctrl</STRONG> can be
+ called before initializing curses. This implementa-
+ tion permits that, and returns the "~@", etc., values
+ in that case.
+
+ <STRONG>o</STRONG> parameter values outside the 0 to 255 range. <STRONG>unctrl</STRONG>
+ returns a null pointer.
+
+ 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-128 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>.
+
+ Likewise, the <STRONG>meta</STRONG> function allows the caller to change
+ the output of <STRONG>keyname</STRONG>, i.e., it determines whether to use
+ the `M-' prefix for "meta" keys (codes in the range 128 to
+ 255). Both <STRONG>use_legacy_coding</STRONG> and <STRONG>meta</STRONG> succeed only after
+ curses is initialized. X/Open Curses does not document
+ the treatment of codes 128 to 159. When treating them as
+ "meta" keys (or if <STRONG>keyname</STRONG> is called before initializing
+ curses), this implementation returns strings "M-^@",
+ "M-^A", etc.
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<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="legacy_coding.3x.html">legacy_coding(3x)</A></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_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG>lega-</STRONG>
+ <STRONG><A HREF="legacy_coding.3x.html">cy_coding(3x)</A></STRONG>.
<STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>
</PRE>
-<HR>
-<ADDRESS>
-Man(1) output converted with
-<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
-</ADDRESS>
+<div class="nav">
+<ul>
+<li><a href="#h2-NAME">NAME</a></li>
+<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
+<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
+<ul>
+<li><a href="#h3-unctrl">unctrl</a></li>
+<li><a href="#h3-keyname_key_name">keyname/key_name</a></li>
+<li><a href="#h3-filter_nofilter">filter/nofilter</a></li>
+<li><a href="#h3-use_env">use_env</a></li>
+<li><a href="#h3-use_tioctl">use_tioctl</a></li>
+<li><a href="#h3-putwin_getwin">putwin/getwin</a></li>
+<li><a href="#h3-delay_output">delay_output</a></li>
+<li><a href="#h3-flushinp">flushinp</a></li>
+</ul>
+</li>
+<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
+<li><a href="#h2-PORTABILITY">PORTABILITY</a>
+<ul>
+<li><a href="#h3-filter">filter</a></li>
+<li><a href="#h3-keyname">keyname</a></li>
+<li><a href="#h3-nofilter_use_tioctl">nofilter/use_tioctl</a></li>
+<li><a href="#h3-putwin_getwin">putwin/getwin</a></li>
+<li><a href="#h3-unctrl_wunctrl">unctrl/wunctrl</a></li>
+</ul>
+</li>
+<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
+</ul>
+</div>
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