ncurses 5.9 - patch 20140823
[ncurses.git] / ncurses / tty / hardscroll.c
index af68c961728d4ac1453a575de4160810c226772f..4ec168a0028ecebf06e02e5ea36088c691574f5f 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2010,2012 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -147,7 +147,7 @@ AUTHOR
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: hardscroll.c,v 1.47 2010/04/24 23:46:47 tom Exp $")
+MODULE_ID("$Id: hardscroll.c,v 1.51 2012/10/17 09:01:10 tom Exp $")
 
 #if defined(SCROLLDEBUG) || defined(HASHDEBUG)
 
@@ -173,9 +173,9 @@ NCURSES_EXPORT_VAR (int *)
 # if USE_HASHMAP
 #  define oldnums(sp)   (sp)->_oldnum_list
 #  define OLDNUM(sp,n) oldnums(sp)[n]
-# else                         /* !USE_HASHMAP */
+# else /* !USE_HASHMAP */
 #  define OLDNUM(sp,n) NewScreen(sp)->_line[n].oldindex
-# endif                                /* !USE_HASHMAP */
+# endif        /* !USE_HASHMAP */
 
 #define OLDNUM_SIZE(sp) (sp)->_oldnum_size
 
@@ -193,14 +193,20 @@ NCURSES_SP_NAME(_nc_scroll_optimize) (NCURSES_SP_DCL0)
 #if !defined(SCROLLDEBUG) && !defined(HASHDEBUG)
 #if USE_HASHMAP
     /* get enough storage */
-    if (OLDNUM_SIZE(SP_PARM) < screen_lines(SP_PARM)) {
+    assert(OLDNUM_SIZE(SP_PARM) >= 0);
+    assert(screen_lines(SP_PARM) > 0);
+    if ((oldnums(SP_PARM) == 0)
+       || (OLDNUM_SIZE(SP_PARM) < screen_lines(SP_PARM))) {
+       int need_lines = ((OLDNUM_SIZE(SP_PARM) < screen_lines(SP_PARM))
+                         ? screen_lines(SP_PARM)
+                         : OLDNUM_SIZE(SP_PARM));
        int *new_oldnums = typeRealloc(int,
-                                      (size_t) screen_lines(SP_PARM),
+                                      (size_t) need_lines,
                                       oldnums(SP_PARM));
        if (!new_oldnums)
            return;
        oldnums(SP_PARM) = new_oldnums;
-       OLDNUM_SIZE(SP_PARM) = screen_lines(SP_PARM);
+       OLDNUM_SIZE(SP_PARM) = need_lines;
     }
     /* calculate the indices */
     NCURSES_SP_NAME(_nc_hash_map) (NCURSES_SP_ARG);
@@ -302,7 +308,9 @@ NCURSES_SP_NAME(_nc_linedump) (NCURSES_SP_DCL0)
 
        *buf = '\0';
        for (n = 0; n < screen_lines(SP_PARM); n++)
-           (void) sprintf(buf + strlen(buf), " %02d", OLDNUM(SP_PARM, n));
+           _nc_SPRINTF(buf + strlen(buf),
+                       _nc_SLIMIT(want - strlen(buf))
+                       " %02d", OLDNUM(SP_PARM, n));
        TR(TRACE_UPDATE | TRACE_MOVE, ("virt %s", buf));
        free(buf);
     }