X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Ftty%2Fhardscroll.c;h=f7c9e0d46f5295b95525da1cdc45da3fa02404f5;hp=6c6052570d3427d6f7c4f3401d4d46adcba4234a;hb=b025434573f466efe27862656a6a9d41dd2bd609;hpb=8b06e371ed1bce3dd6f37138e6becb5e1a562fe0

diff --git a/ncurses/tty/hardscroll.c b/ncurses/tty/hardscroll.c
index 6c605257..f7c9e0d4 100644
--- a/ncurses/tty/hardscroll.c
+++ b/ncurses/tty/hardscroll.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2010,2012 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2015,2016 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 1.49 2012/02/22 22:40:24 tom Exp $")
+MODULE_ID("$Id: hardscroll.c,v 1.53 2016/05/28 23:32:40 tom Exp $")
 
 #if defined(SCROLLDEBUG) || defined(HASHDEBUG)
 
@@ -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);
@@ -294,11 +300,12 @@ NCURSES_EXPORT(void)
 NCURSES_SP_NAME(_nc_linedump) (NCURSES_SP_DCL0)
 /* dump the state of the real and virtual oldnum fields */
 {
-    int n;
     char *buf = 0;
     size_t want = ((size_t) screen_lines(SP_PARM) + 1) * 4;
+    (void) SP_PARM;
 
     if ((buf = typeMalloc(char, want)) != 0) {
+	int n;
 
 	*buf = '\0';
 	for (n = 0; n < screen_lines(SP_PARM); n++)
@@ -333,7 +340,7 @@ main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
     for (;;) {
 	int n;
 
-	for (n = 0; n < screen_lines; n++)
+	for (n = 0; n < screen_lines(sp); n++)
 	    oldnums[n] = _NEWINDEX;
 
 	/* grab the test vector */