ncurses 5.6 - patch 20080830

[ncurses.git] / ncurses / base / lib_newwin.c

diff --git a/ncurses/base/lib_newwin.c b/ncurses/base/lib_newwin.c
index 84763c93fc27277803d39d67aa63611a2d44cb18..587e83a920092f57bc3e48712d61d59e48ea6fdb 100644 (file)
--- a/ncurses/base/lib_newwin.c
+++ b/ncurses/base/lib_newwin.c
@@ -42,9 +42,9 @@
 #include <curses.priv.h>
 #include <stddef.h>
 
-MODULE_ID("$Id: lib_newwin.c,v 1.46 2008/04/05 19:16:42 tom Exp $")
+MODULE_ID("$Id: lib_newwin.c,v 1.52 2008/06/07 13:58:09 tom Exp $")
 
-#define window_is(name) (sp->_##name == win)
+#define window_is(name) ((sp)->_##name == win)
 
 #if USE_REENTRANT
 #define remove_window(name) \
@@ -56,27 +56,23 @@ MODULE_ID("$Id: lib_newwin.c,v 1.46 2008/04/05 19:16:42 tom Exp $")
                    name = 0
 #endif
 
-static WINDOW *
+static void
 remove_window_from_screen(WINDOW *win)
 {
-    SCREEN **scan = &_nc_screen_chain;
+    SCREEN *sp;
 
-    while (*scan) {
-       SCREEN *sp = *scan;
+    for (each_screen(sp)) {
        if (window_is(curscr)) {
            remove_window(curscr);
+           break;
        } else if (window_is(stdscr)) {
            remove_window(stdscr);
+           break;
        } else if (window_is(newscr)) {
            remove_window(newscr);
-       } else {
-           scan = &(*scan)->_next_screen;
-           continue;
+           break;
        }
-       break;
     }
-
-    return 0;
 }
 
 NCURSES_EXPORT(int)
@@ -89,8 +85,9 @@ _nc_freewin(WINDOW *win)
     T((T_CALLED("_nc_freewin(%p)"), win));
 
     if (win != 0) {
-       if (_nc_try_global(windowlist) == 0) {
-           for (p = _nc_windows, q = 0; p != 0; q = p, p = p->next) {
+       if (_nc_try_global(curses) == 0) {
+           q = 0;
+           for (each_window(p)) {
                if (&(p->win) == win) {
                    remove_window_from_screen(win);
                    if (q == 0)
@@ -109,8 +106,9 @@ _nc_freewin(WINDOW *win)
                    T(("...deleted win=%p", win));
                    break;
                }
+               q = p;
            }
-           _nc_unlock_global(windowlist);
+           _nc_unlock_global(curses);
        }
     }
     returnCode(result);
@@ -231,8 +229,6 @@ _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
     if ((wp = typeCalloc(WINDOWLIST, 1)) == 0)
        returnWin(0);
 
-    _nc_mutex_init(&(wp->mutex_use_window));
-
     win = &(wp->win);
 
     if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) {
@@ -240,7 +236,7 @@ _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
        returnWin(0);
     }
 
-    _nc_lock_global(windowlist);
+    _nc_lock_global(curses);
 
     win->_curx = 0;
     win->_cury = 0;
@@ -315,10 +311,28 @@ _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
     }
 
     wp->next = _nc_windows;
+    wp->screen = SP;
     _nc_windows = wp;
 
     T((T_CREATE("window %p"), win));
 
-    _nc_unlock_global(windowlist);
+    _nc_unlock_global(curses);
     returnWin(win);
 }
+
+/*
+ * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
+ * internally, and it is useful to allow those to be invoked without switching
+ * SCREEN's, e.g., for multi-threaded applications.
+ */
+NCURSES_EXPORT(SCREEN *)
+_nc_screen_of(WINDOW *win)
+{
+    SCREEN *sp = 0;
+
+    if (win != 0) {
+       WINDOWLIST *wp = (WINDOWLIST *) win;
+       sp = wp->screen;
+    }
+    return (sp);
+}