fanzeyi / rpms / ncurses

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Blame SOURCES/ncurses-clear.patch

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diff -up ncurses-5.9/man/clear.1.clear ncurses-5.9/man/clear.1
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--- ncurses-5.9/man/clear.1.clear	2010-12-04 19:36:44.000000000 +0100
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+++ ncurses-5.9/man/clear.1	2013-01-30 12:33:06.140568071 +0100
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@@ -37,7 +37,10 @@
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 .SH DESCRIPTION
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 \fB@CLEAR@\fR clears your screen if this is possible.  It looks in the
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 environment for the terminal type and then in the \fBterminfo\fR database to
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-figure out how to clear the screen.
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+figure out how to clear the screen.  Some terminals can clear also their
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+scrollback buffer to prevent access to potentially sensitive data.  If the
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+\fBterminfo\fR entry for the terminal type contains extended capability
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+\fBE3\fR, \fB@CLEAR@\fR will use it to clear the scrollback buffer.
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 .PP
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 \fB@CLEAR@\fR ignores any command-line parameters that may be present.
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 .SH SEE ALSO
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diff -up ncurses-5.9/progs/clear.c.clear ncurses-5.9/progs/clear.c
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--- ncurses-5.9/progs/clear.c.clear	2007-10-14 00:16:02.000000000 +0200
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+++ ncurses-5.9/progs/clear.c	2013-01-30 12:13:10.494509019 +0100
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@@ -52,7 +52,15 @@ main(
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 	int argc GCC_UNUSED,
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 	char *argv[]GCC_UNUSED)
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 {
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+    char *E3;
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+
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     setupterm((char *) 0, STDOUT_FILENO, (int *) 0);
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+    
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+    /* Clear the scrollback buffer if possible. */
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+    E3 = tigetstr("E3");
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+    if (E3 && E3 != CANCELLED_STRING)
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+	tputs(E3, lines > 0 ? lines : 1, putch);
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+
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     ExitProgram((tputs(clear_screen, lines > 0 ? lines : 1, putch) == ERR)
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 		? EXIT_FAILURE
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 		: EXIT_SUCCESS);