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- * @Id: curs_pad.3x,v 1.49 2023/11/25 14:08:35 tom Exp @
+ * @Id: curs_pad.3x,v 1.61 2024/04/27 17:55:43 tom Exp @
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-<H1 class="no-header">curs_pad 3x 2023-11-25 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_pad 3x 2024-04-27 ncurses 6.5 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>WINDOW</STRONG> <STRONG>*newpad(int</STRONG> <EM>nlines</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>ncols</EM><STRONG>);</STRONG>
- <STRONG>WINDOW</STRONG> <STRONG>*subpad(WINDOW</STRONG> <STRONG>*</STRONG><EM>orig</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>nlines</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>ncols</EM><STRONG>,</STRONG>
+ <STRONG>WINDOW</STRONG> <STRONG>*subpad(WINDOW</STRONG> <STRONG>*</STRONG><EM>parent</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>nlines</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>ncols</EM><STRONG>,</STRONG>
<STRONG>int</STRONG> <EM>begin</EM><STRONG>_</STRONG><EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>begin</EM><STRONG>_</STRONG><EM>x</EM><STRONG>);</STRONG>
+
<STRONG>int</STRONG> <STRONG>prefresh(WINDOW</STRONG> <STRONG>*</STRONG><EM>pad</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>pminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>pmincol</EM><STRONG>,</STRONG>
<STRONG>int</STRONG> <EM>sminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smaxrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smaxcol</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>pnoutrefresh(WINDOW</STRONG> <STRONG>*</STRONG><EM>pad</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>pminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>pmincol</EM><STRONG>,</STRONG>
<STRONG>int</STRONG> <EM>sminrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smincol</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smaxrow</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>smaxcol</EM><STRONG>);</STRONG>
+
<STRONG>int</STRONG> <STRONG>pechochar(WINDOW</STRONG> <STRONG>*</STRONG><EM>pad</EM><STRONG>,</STRONG> <STRONG>chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>pecho_wchar(WINDOW</STRONG> <STRONG>*</STRONG><EM>pad</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>cchar_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+ A <EM>curses</EM> <EM>pad</EM> is like a window, except that it is not restricted by the
+ screen size, and is not necessarily associated with a particular part
+ of the screen. Pads can be used when a large window is needed, only
+ part of which is to be visible on the screen. Pads are not
+ automatically refreshed by scrolling or input-echoing operations.
-</PRE><H3><a name="h3-newpad">newpad</a></H3><PRE>
- The <STRONG>newpad</STRONG> routine creates and returns a pointer to a new pad data
- structure with the given number of lines, <EM>nlines</EM>, and columns, <EM>ncols</EM>.
- A pad is like a window, except that it is not restricted by the screen
- size, and is not necessarily associated with a particular part of the
- screen. Pads can be used when a large window is needed, and only a
- part of the window will be on the screen at one time. Automatic
- refreshes of pads (e.g., from scrolling or echoing of input) do not
- occur.
+ Pads cannot be refreshed with <STRONG><A HREF="curs_refresh.3x.html">wrefresh(3x)</A></STRONG>; use <STRONG>prefresh</STRONG> or
+ <STRONG>pnoutrefresh</STRONG> instead.
- It is not valid to call <STRONG>wrefresh</STRONG> with a <EM>pad</EM> argument; call <STRONG>prefresh</STRONG> or
- <STRONG>pnoutrefresh</STRONG> instead. They require additional parameters to specify
- the part of the pad to be displayed and the location on the screen to
- be used for the display.
+
+</PRE><H3><a name="h3-newpad">newpad</a></H3><PRE>
+ <STRONG>newpad</STRONG> creates and returns a pointer to a new pad data structure with
+ the given number of lines, <EM>nlines</EM>, and columns, <EM>ncols</EM>.
</PRE><H3><a name="h3-subpad">subpad</a></H3><PRE>
- The <STRONG>subpad</STRONG> routine creates and returns a pointer to a subwindow within
- a pad with the given number of lines, <EM>nlines</EM>, and columns, <EM>ncols</EM>.
- Unlike <STRONG>subwin</STRONG>, which uses screen coordinates, the window is at position
- (<EM>begin</EM>_<EM>x</EM><STRONG>,</STRONG> <EM>begin</EM>_<EM>y</EM>) on the pad. The window is made in the middle of the
- window <EM>orig</EM>, so that changes made to one window affect both windows.
- During the use of this routine, it will often be necessary to call
- <STRONG>touchwin</STRONG> or <STRONG>touchline</STRONG> on <EM>orig</EM> before calling <STRONG>prefresh</STRONG>.
+ <STRONG>subpad</STRONG> creates and returns a pointer to a subwindow within a pad with
+ the given number of lines, <EM>nlines</EM>, and columns, <EM>ncols</EM>. Unlike
+ <STRONG><A HREF="subwin.3x.html">subwin(3x)</A></STRONG>, which uses screen coordinates, the new pad is placed at
+ position (<EM>begin</EM><STRONG>_</STRONG><EM>y</EM>, <EM>begin</EM><STRONG>_</STRONG><EM>x</EM>) relative to its parent. Thus, changes made
+ to one pad can affect both. When operating on a subpad, it is often
+ necessary to call <STRONG><A HREF="curs_touch.3x.html">touchwin(3x)</A></STRONG> or <STRONG><A HREF="curs_touch.3x.html">touchline(3x)</A></STRONG> on <EM>parent</EM> before
+ calling <STRONG>prefresh</STRONG>.
-</PRE><H3><a name="h3-prefresh_
-pnoutrefresh">prefresh, pnoutrefresh</a></H3><PRE>
- The <STRONG>prefresh</STRONG> and <STRONG>pnoutrefresh</STRONG> routines are analogous to <STRONG>wrefresh</STRONG> and
- <STRONG>wnoutrefresh</STRONG> except that they relate to pads instead of windows. The
- additional parameters are needed to indicate what part of the pad and
- screen are involved.
+</PRE><H3><a name="h3-prefresh_pnoutrefresh">prefresh, pnoutrefresh</a></H3><PRE>
+ <STRONG>prefresh</STRONG> and <STRONG>pnoutrefresh</STRONG> are analogous to <STRONG><A HREF="curs_refresh.3x.html">wrefresh(3x)</A></STRONG> and
+ <STRONG><A HREF="curs_refresh.3x.html">wnoutrefresh(3x)</A></STRONG> except that they operate on pads rather than windows.
+ They require additional parameters are needed to indicate what portions
+ of the pad and screen are involved.
- <STRONG>o</STRONG> The <EM>pminrow</EM> and <EM>pmincol</EM> parameters specify the upper left-hand
- corner of the rectangle to be displayed in the pad.
+ <STRONG>o</STRONG> <EM>pminrow</EM> and <EM>pmincol</EM> specify the upper left-hand corner of a
+ rectangular view of the pad.
- <STRONG>o</STRONG> The <EM>sminrow</EM>, <EM>smincol</EM>, <EM>smaxrow</EM>, and <EM>smaxcol</EM> parameters specify the
- edges of the rectangle to be displayed on the screen.
+ <STRONG>o</STRONG> <EM>sminrow</EM>, <EM>smincol</EM>, <EM>smaxrow</EM>, and <EM>smaxcol</EM> specify the vertices of the
+ rectangle to be displayed on the screen.
The lower right-hand corner of the rectangle to be displayed in the pad
is calculated from the screen coordinates, since the rectangles must be
the same size. Both rectangles must be entirely contained within their
- respective structures. Negative values of <EM>pminrow</EM>, <EM>pmincol</EM>, <EM>sminrow</EM>,
- or <EM>smincol</EM> are treated as if they were zero.
+ respective structures. <EM>curses</EM> treats negative values of any of these
+ parameters as zero.
</PRE><H3><a name="h3-pechochar">pechochar</a></H3><PRE>
- The <STRONG>pechochar</STRONG> routine is functionally equivalent to a call to <STRONG>addch</STRONG>
- followed by a call to <STRONG><A HREF="curs_refresh.3x.html">refresh(3x)</A></STRONG>, a call to <STRONG>waddch</STRONG> followed by a call
- to <STRONG>wrefresh</STRONG>, or a call to <STRONG>waddch</STRONG> followed by a call to <STRONG>prefresh</STRONG>. The
- knowledge that only a single character is being output is taken into
- consideration and, for non-control characters, a considerable
- performance gain might be seen by using these routines instead of their
- equivalents. In the case of <STRONG>pechochar</STRONG>, the last location of the pad on
- the screen is reused for the arguments to <STRONG>prefresh</STRONG>.
+ <STRONG>pechochar</STRONG> is functionally equivalent to calling <STRONG><A HREF="curs_addch.3x.html">waddch(3x)</A></STRONG> followed by
+ <STRONG>prefresh</STRONG>. It suggests to the <EM>curses</EM> optimizer that only a single
+ character is being output; a considerable performance benefit may be
+ thus enjoyed. The location of the character <EM>ch</EM> written to the pad is
+ used to populate the arguments to <STRONG>prefresh</STRONG>.
</PRE><H3><a name="h3-pecho_wchar">pecho_wchar</a></H3><PRE>
- The <STRONG>pecho_wchar</STRONG> function is the analogous wide-character form of
- <STRONG>pechochar</STRONG>. It outputs one character to a pad and immediately refreshes
- the pad. It does this by a call to <STRONG>wadd_wch</STRONG> followed by a call to
- <STRONG>prefresh</STRONG>.
+ <STRONG>pecho_wchar</STRONG> is functionally equivalent to calling <STRONG><A HREF="curs_add_wch.3x.html">wadd_wch(3x)</A></STRONG> followed
+ by <STRONG>prefresh</STRONG>. It suggests to the <EM>curses</EM> optimizer that only a single
+ wide character is being output; a considerable performance benefit may
+ be thus enjoyed. The location of the character <EM>wch</EM> written to the pad
+ is used to populate the arguments to <STRONG>prefresh</STRONG>.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- Routines that return an integer return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4
- only specifies "an integer value other than <STRONG>ERR</STRONG>") upon successful
+ Functions 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.
- Routines that return pointers return <STRONG>NULL</STRONG> on error, and set <STRONG>errno</STRONG> to
+ Functions that return pointers return <STRONG>NULL</STRONG> on error, and set <STRONG>errno</STRONG> to
<STRONG>ENOMEM</STRONG>.
- X/Open does not define any error conditions. In this implementation
+ X/Open Curses does not specify any error conditions. In this
+ implementation
<STRONG>prefresh</STRONG> and <STRONG>pnoutrefresh</STRONG>
return an error if the window pointer is null, or if the window
- is not really a pad or if the area to refresh extends off-
- screen or if the minimum coordinates are greater than the
+ is not really a pad or if the area to refresh extends off-
+ screen or if the minimum coordinates are greater than the
maximum.
<STRONG>pechochar</STRONG>
- returns an error if the window is not really a pad, and the
+ returns an error if the window is not really a pad, and the
associated call to <STRONG>wechochar</STRONG> returns an error.
<STRONG>pecho_wchar</STRONG>
- returns an error if the window is not really a pad, and the
+ returns an error if the window is not really a pad, and the
associated call to <STRONG>wecho_wchar</STRONG> returns an error.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- Note that <STRONG>pechochar</STRONG> may be a macro.
+ <STRONG>pechochar</STRONG> may be a macro.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
BSD <EM>curses</EM> has no <EM>pad</EM> feature.
- SVr2 <EM>curses</EM> (1986) provided the <STRONG>newpad</STRONG> and related functions,
- documenting them in a single line each. SVr3 (1987) provided more
+ SVr2 <EM>curses</EM> (1986) provided the <STRONG>newpad</STRONG> and related functions,
+ documenting them in a single line each. SVr3 (1987) provided more
extensive documentation.
- The documentation does not explain the term <EM>pad</EM>. However, the Apollo
+ The documentation does not explain the term <EM>pad</EM>. However, the Apollo
<EM>Aegis</EM> workstation operating system supported a graphical <EM>pad</EM> feature:
- <STRONG>o</STRONG> These graphical pads could be much larger than the computer's
+ <STRONG>o</STRONG> These graphical pads could be much larger than the computer's
display.
- <STRONG>o</STRONG> The read-only output from a command could be scrolled back to
+ <STRONG>o</STRONG> The read-only output from a command could be scrolled back to
inspect, and select text from the pad.
The two uses may be related.
- The XSI Curses standard, Issue 4 describes these functions, without
- significant change from the SVr3 documentation. It describes no error
- conditions. The behavior of <STRONG>subpad</STRONG> if the parent window is not a pad
- is undocumented, and is not checked by the vendor Unix implementations:
+ X/Open Curses, Issue 4 describes these functions, without significant
+ change from the SVr3 documentation. It describes no error conditions.
+ The behavior of <STRONG>subpad</STRONG> if the parent window is not a pad is
+ undocumented, and is not checked by the vendor Unix implementations:
- <STRONG>o</STRONG> SVr4 <EM>curses</EM> sets a flag in the <STRONG>WINDOW</STRONG> structure in <STRONG>newpad</STRONG> which
+ <STRONG>o</STRONG> SVr4 <EM>curses</EM> sets a flag in the <EM>WINDOW</EM> structure in <STRONG>newpad</STRONG> which
tells if the window is a <EM>pad</EM>.
- However, it uses this information only in <STRONG>waddch</STRONG> (to decide if it
- should call <STRONG>wrefresh</STRONG>) and <STRONG>wscrl</STRONG> (to avoid scrolling a pad), and
- does not check in <STRONG>wrefresh</STRONG> to ensure that the pad is refreshed
+ However, it uses this information only in <STRONG>waddch</STRONG> (to decide if it
+ should call <STRONG>wrefresh</STRONG>) and <STRONG>wscrl</STRONG> (to avoid scrolling a pad), and
+ does not check in <STRONG>wrefresh</STRONG> to ensure that the pad is refreshed
properly.
- <STRONG>o</STRONG> Solaris X/Open Curses checks if a window is a pad in <STRONG>wnoutrefresh</STRONG>,
+ <STRONG>o</STRONG> Solaris <EM>xcurses</EM> checks whether a window is a pad in <STRONG>wnoutrefresh</STRONG>,
returning <STRONG>ERR</STRONG> in that case.
- However, it only sets the flag for subwindows if the parent window
- is a pad. Its <STRONG>newpad</STRONG> function does not set this information.
+ However, it only sets the flag for subwindows if the parent window
+ is a pad. Its <STRONG>newpad</STRONG> function does not set this information.
Consequently, the check will never fail.
- It makes no comparable check in <STRONG>pnoutrefresh</STRONG>, though interestingly
- enough, a comment in the source code states that the lack of a
+ It makes no comparable check in <STRONG>pnoutrefresh</STRONG>, though interestingly
+ enough, a comment in the source code states that the lack of a
check was an MKS extension.
- <STRONG>o</STRONG> NetBSD 7 <EM>curses</EM> sets a flag in the <STRONG>WINDOW</STRONG> structure for <STRONG>newpad</STRONG> and
- <STRONG>subpad</STRONG>, using this to help with the distinction between
+ <STRONG>o</STRONG> NetBSD 7 <EM>curses</EM> sets a flag in the <EM>WINDOW</EM> structure for <STRONG>newpad</STRONG> and
+ <STRONG>subpad</STRONG>, using this to help with the distinction between
<STRONG>wnoutrefresh</STRONG> and <STRONG>pnoutrefresh</STRONG>.
- It does not check for the case where a subwindow is created in a
+ It does not check for the case where a subwindow is created in a
pad using <STRONG>subwin</STRONG> or <STRONG>derwin</STRONG>.
- The <STRONG>dupwin</STRONG> function returns a regular window when duplicating a
- pad. Likewise, <STRONG>getwin</STRONG> always returns a window, even if the saved
+ The <STRONG>dupwin</STRONG> function returns a regular window when duplicating a
+ pad. Likewise, <STRONG>getwin</STRONG> always returns a window, even if the saved
data was from a pad.
This implementation
- <STRONG>o</STRONG> sets a flag in the <STRONG>WINDOW</STRONG> structure for <STRONG>newpad</STRONG> and <STRONG>subpad</STRONG>,
+ <STRONG>o</STRONG> sets a flag in the <EM>WINDOW</EM> structure for <STRONG>newpad</STRONG> and <STRONG>subpad</STRONG>,
- <STRONG>o</STRONG> allows a <STRONG>subwin</STRONG> or <STRONG>derwin</STRONG> call to succeed having a pad parent by
+ <STRONG>o</STRONG> allows a <STRONG>subwin</STRONG> or <STRONG>derwin</STRONG> call to succeed having a pad parent by
forcing the subwindow to be a pad,
- <STRONG>o</STRONG> checks in both <STRONG>wnoutrefresh</STRONG> and <STRONG>pnoutrefresh</STRONG> to ensure that pads
+ <STRONG>o</STRONG> checks in both <STRONG>wnoutrefresh</STRONG> and <STRONG>pnoutrefresh</STRONG> to ensure that pads
and windows are handled distinctly, and
- <STRONG>o</STRONG> ensures that <STRONG>dupwin</STRONG> and <STRONG>getwin</STRONG> treat pads versus windows
+ <STRONG>o</STRONG> ensures that <STRONG>dupwin</STRONG> and <STRONG>getwin</STRONG> treat pads versus windows
consistently.
-ncurses 6.
4 2023-11-25 <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>
+ncurses 6.
5 2024-04-27 <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<ul>
<li><a href="#h3-newpad">newpad</a></li>
<li><a href="#h3-subpad">subpad</a></li>
-<li><a href="#h3-prefresh_-pnoutrefresh">prefresh, pnoutrefresh</a></li>
+<li><a href="#h3-prefresh_pnoutrefresh">prefresh, pnoutrefresh</a></li>
<li><a href="#h3-pechochar">pechochar</a></li>
<li><a href="#h3-pecho_wchar">pecho_wchar</a></li>
</ul>
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