Bug#779354: Terminal incorrectly restored on exit from purity

[Pedro Gimeno <debian.bts@personal.formauri.es>]

Package: purity
Version: 1-18
Tags: patch

When exiting from 'purity', the terminal is left in a bad state. Ctrl+C
does no longer work to cancel the command line and the prompt in 'rm -i'
does not echo characters, and needs me to press Ctrl+J instead of Enter
to confirm.

The reason is that 'purity' uses a signed short instead of the adequate
type, tcflag_t, for saving the tcsetattr flags that it restores later.
Since bit 15 is set in my case, when expanded to unsigned, the high bits
are all set, setting all kinds of unwanted flags that cause the above
behaviour.

The attached patch solves it.

diff -u purity-1/pt.c purity-1-fix/pt.c
--- purity-1-orig/pt.c	2015-02-27 16:18:17.000000000 +0100
+++ purity-1/pt.c	2015-02-27 16:12:50.000000000 +0100
@@ -80,9 +80,11 @@
 static struct quest *theq, *nextq, *the_s, *next_s;
 static int num_ch, num_ln, kill_sub, no_ans, zoom, obfus, fast, derange, rot13;
 
-static short tty_flags;
 #ifdef SYSV
+static tcflag_t tty_flags;
 static unsigned char baz;
+#else
+static short tty_flags;
 #endif
 
 static unsigned short rows, cols;