Added SP->in_endwin Boolean. While in endwin(), we should use only si…

…gnal-safe functions, meaning (at the very least) debugging should be turned off. I think this fixes wmcbrine/PDCurses#134.

curses.h

@@ -418,8 +418,8 @@ typedef struct
                                       on last key press */
     bool  return_key_modifiers;    /* TRUE if modifier keys are
                                       returned as "real" keys */
-    bool  unused_key_code;         /* (was) TRUE if last key is a special key;
-                                      used internally by get_wch() */
+    bool  in_endwin;               /* if we're in endwin(),  we should use
+                                      only signal-safe code */
     MOUSE_STATUS mouse_status;     /* last returned mouse status */
     short line_color;     /* color of line attributes - default -1 */
     attr_t termattrs;     /* attribute capabilities */

pdcurses/debug.c

@@ -71,7 +71,7 @@ void PDC_debug(const char *fmt, ...)
     time_t now;
 
     assert( SP);
-    if (!SP || !SP->dbfp)
+    if (!SP || !SP->dbfp || SP->in_endwin)
         return;
 
     time(&now);

pdcurses/initscr.c

@@ -310,6 +310,7 @@ WINDOW *Xinitscr(int argc, char **argv)
 
 int endwin(void)
 {
+    SP->in_endwin = TRUE;
     PDC_LOG(("endwin() - called\n"));
 
     /* Allow temporary exit from curses using endwin() */
@@ -320,6 +321,7 @@ int endwin(void)
     assert( SP);
     SP->alive = FALSE;
 
+    SP->in_endwin = FALSE;
     return OK;
 }