ncurses 6.0 - patch 20170513

[ncurses.git] / test / filter.c

diff --git a/test/filter.c b/test/filter.c
index d5bd10a850bb9c4d4d84153e9d3bfadc3e888f22..90a74a6cec9bc2790ed2cfed70630d1b8c12e587 100644 (file)
--- a/test/filter.c
+++ b/test/filter.c
@@ -29,7 +29,7 @@
 /*
  * Author:  Thomas E. Dickey 1998
  *
- * $Id: filter.c,v 1.22 2016/03/13 00:41:43 tom Exp $
+ * $Id: filter.c,v 1.28 2016/09/10 21:23:23 tom Exp $
  *
  * An example of the 'filter()' function in ncurses, this program prompts
  * for commands and executes them (like a command shell).  It illustrates
@@ -68,10 +68,10 @@ show_prompt(int underline, bool clocked)
            int skip, y, x;
            int margin;
 
-           sprintf(buffer, "%02d:%02d:%02d",
-                   my->tm_hour,
-                   my->tm_min,
-                   my->tm_sec);
+           _nc_SPRINTF(buffer, _nc_SLIMIT(sizeof(buffer)) "%02d:%02d:%02d",
+                       my->tm_hour,
+                       my->tm_min,
+                       my->tm_sec);
 
            if (limit > 9) {
                skip = 0;
@@ -242,11 +242,11 @@ new_command(char *buffer, int length, int underline, bool clocked, bool polled)
         */
 #ifdef KEY_EVENT
        if (code == KEY_EVENT)
-           strcpy(buffer, "# event!");
+           _nc_STRCPY(buffer, "# event!", length);
 #endif
 #ifdef KEY_RESIZE
        if (code == KEY_RESIZE) {
-           strcpy(buffer, "# resize!");
+           _nc_STRCPY(buffer, "# resize!", length);
            getch();
        }
 #endif
@@ -258,6 +258,44 @@ new_command(char *buffer, int length, int underline, bool clocked, bool polled)
     return code;
 }
 
+#ifdef NCURSES_VERSION
+/*
+ * Cancel xterm's alternate-screen mode (from dialog -TD)
+ */
+#define isprivate(s) ((s) != 0 && strstr(s, "\033[?") != 0)
+static void
+cancel_altscreen(void)
+{
+    if (isatty(fileno(stdout))
+       && key_mouse != 0       /* xterm and kindred */
+       && isprivate(enter_ca_mode)
+       && isprivate(exit_ca_mode)) {
+       /*
+        * initscr() or newterm() already wrote enter_ca_mode as a side effect
+        * of initializing the screen.  It would be nice to not even do that,
+        * but we do not really have access to the correct copy of the
+        * terminfo description until those functions have been invoked.
+        */
+       (void) refresh();
+       (void) putp(exit_ca_mode);
+       (void) fflush(stdout);
+       /*
+        * Prevent ncurses from switching "back" to the normal screen when
+        * exiting from this program.  That would move the cursor to the
+        * original location saved in xterm.  Normally curses sets the cursor
+        * position to the first line after the display, but the alternate
+        * screen switching is done after that point.
+        *
+        * Cancelling the strings altogether also works around the buggy
+        * implementation of alternate-screen in rxvt, etc., which clear more
+        * of the display than they should.
+        */
+       enter_ca_mode = 0;
+       exit_ca_mode = 0;
+    }
+}
+#endif
+
 static void
 usage(void)
 {
@@ -266,6 +304,9 @@ usage(void)
        "Usage: filter [options]"
        ,""
        ,"Options:"
+#ifdef NCURSES_VERSION
+       ,"  -a   suppress xterm alternate-screen by amending smcup/rmcup"
+#endif
        ,"  -c   show current time on prompt line with \"Command\""
        ,"  -i   use initscr() rather than newterm()"
        ,"  -p   poll for individual characters rather than using getnstr"
@@ -282,14 +323,22 @@ main(int argc, char *argv[])
     int ch;
     char buffer[80];
     int underline;
+#ifdef NCURSES_VERSION
+    bool a_option = FALSE;
+#endif
     bool c_option = FALSE;
     bool i_option = FALSE;
     bool p_option = FALSE;
 
     setlocale(LC_ALL, "");
 
-    while ((ch = getopt(argc, argv, "cip")) != -1) {
+    while ((ch = getopt(argc, argv, "acip")) != -1) {
        switch (ch) {
+#ifdef NCURSES_VERSION
+       case 'a':
+           a_option = TRUE;
+           break;
+#endif
        case 'c':
            c_option = TRUE;
            break;
@@ -312,6 +361,11 @@ main(int argc, char *argv[])
     } else {
        (void) newterm((char *) 0, stdout, stdin);
     }
+#ifdef NCURSES_VERSION
+    if (a_option) {
+       cancel_altscreen();
+    }
+#endif
     cbreak();
     keypad(stdscr, TRUE);
 
@@ -342,7 +396,7 @@ main(int argc, char *argv[])
        erase();
        refresh();
     }
-    printw("done");
+    clear();
     refresh();
     endwin();
     ExitProgram(EXIT_SUCCESS);