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38 <TITLE>curs_scr_dump 3x 2023-12-30 ncurses 6.4 Library calls</TITLE>
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43 <H1 class="no-header">curs_scr_dump 3x 2023-12-30 ncurses 6.4 Library calls</H1>
45 <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51 <STRONG>scr_dump</STRONG>, <STRONG>scr_restore</STRONG>, <STRONG>scr_init</STRONG>, <STRONG>scr_set</STRONG> - read/write a <EM>curses</EM> screen
55 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
56 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
58 <STRONG>int</STRONG> <STRONG>scr_dump(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
59 <STRONG>int</STRONG> <STRONG>scr_restore(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
60 <STRONG>int</STRONG> <STRONG>scr_init(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
61 <STRONG>int</STRONG> <STRONG>scr_set(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>filename</EM><STRONG>);</STRONG>
64 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
65 <EM>curses</EM> provides applications the ability to write the contents of the
66 screen to a file and read them back. To read/write a window (rather
67 than the whole screen) from/to a file, use <STRONG><A HREF="curs_util.3x.html">getwin(3x)</A></STRONG> and <STRONG><A HREF="curs_util.3x.html">putwin(3x)</A></STRONG>,
71 </PRE><H3><a name="h3-scr_dump">scr_dump</a></H3><PRE>
72 <STRONG>scr_dump</STRONG> writes to <EM>filename</EM> the contents of the virtual screen; see
73 <STRONG><A HREF="curs_variables.3x.html">curscr(3x)</A></STRONG>.
76 </PRE><H3><a name="h3-scr_restore">scr_restore</a></H3><PRE>
77 <STRONG>scr_restore</STRONG> updates the virtual screen to contain the contents of
78 <EM>filename</EM> (if it was validly written with <STRONG>scr_dump</STRONG>). No refresh is
79 performed; after performing any further desired updates, call
80 <STRONG><A HREF="curs_refresh.3x.html">doupdate(3x)</A></STRONG> or similar.
83 </PRE><H3><a name="h3-scr_init">scr_init</a></H3><PRE>
84 <STRONG>scr_init</STRONG> reads <EM>filename,</EM> using it to initialize <EM>curses</EM> data structures
85 describing the state of the terminal screen. If these data are valid,
86 <EM>curses</EM> bases its next update of the screen on this information rather
87 than clearing it and starting from scratch.
89 The data fail the validity check
91 <STRONG>o</STRONG> if the terminal employs <EM>terminfo</EM> capabilities <STRONG>exit_ca_mode</STRONG> (<STRONG>rmcup</STRONG>)
92 or <STRONG>non_rev_rmcup</STRONG> (<STRONG>nrrmc</STRONG>) are defined, or
94 <STRONG>o</STRONG> if <EM>curses</EM> knows that the terminal has been written to since the
95 preceding <STRONG>scr_dump</STRONG> call.
97 <STRONG>scr_init</STRONG> could be used after <STRONG><A HREF="curs_initscr.3x.html">initscr(3x)</A></STRONG> or <STRONG>system(3)</STRONG> to share the
98 screen with another process that has done a <STRONG>scr_dump</STRONG> after <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG>.
101 </PRE><H3><a name="h3-scr_set">scr_set</a></H3><PRE>
102 The <STRONG>scr_set</STRONG> routine is a combination of <STRONG>scr_restore</STRONG> and <STRONG>scr_init</STRONG>. It
103 tells the program that the information in <EM>filename</EM> is what is currently
104 on the screen, and also what the program wants on the screen. This can
105 be thought of as a screen inheritance function.
108 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
109 These functions return <STRONG>OK</STRONG> on success and <STRONG>ERR</STRONG> on failure.
111 X/Open defines no failure conditions. In this implementation, each
112 function fails if it cannot open <EM>filename.</EM>
115 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
116 <STRONG>scr_init</STRONG>, <STRONG>scr_set</STRONG>, and <STRONG>scr_restore</STRONG> may be macros.
119 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
120 X/Open Curses, Issue 4, describes these functions.
122 SVr4 omitted the <EM>const</EM> qualifiers.
124 SVr4 documentation describes <STRONG>scr_init</STRONG> such that the dump data is also
125 considered invalid "if the time-stamp of the tty is old" but does not
129 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
130 <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_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>,
131 <STRONG>system(3)</STRONG>, <STRONG><A HREF="scr_dump.5.html">scr_dump(5)</A></STRONG>
135 ncurses 6.4 2023-12-30 <STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>
139 <li><a href="#h2-NAME">NAME</a></li>
140 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
141 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
143 <li><a href="#h3-scr_dump">scr_dump</a></li>
144 <li><a href="#h3-scr_restore">scr_restore</a></li>
145 <li><a href="#h3-scr_init">scr_init</a></li>
146 <li><a href="#h3-scr_set">scr_set</a></li>
149 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
150 <li><a href="#h2-NOTES">NOTES</a></li>
151 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
152 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>