X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/d719927eb175a73b13a7015498e9757010344bf5..193c8d4a7559f40fe0e0c8610cf6832a0e976e77:/terminal.c

diff --git a/terminal.c b/terminal.c
index 72bfbc9b..a29645a0 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1978,7 +1978,7 @@ static void check_selection(Terminal *term, pos from, pos to)
 static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 {
     termline *line;
-    int i, seltop;
+    int i, seltop, scrollwinsize;
 #ifdef OPTIMISE_SCROLL
     int olddisptop, shift;
 #endif /* OPTIMISE_SCROLL */
@@ -1990,8 +1990,14 @@ static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
     olddisptop = term->disptop;
     shift = lines;
 #endif /* OPTIMISE_SCROLL */
+
+    scrollwinsize = botline - topline + 1;
+
     if (lines < 0) {
-	while (lines < 0) {
+        lines = -lines;
+        if (lines > scrollwinsize)
+            lines = scrollwinsize;
+	while (lines-- > 0) {
 	    line = delpos234(term->screen, botline);
             resizeline(term, line, term->cols);
 	    for (i = 0; i < term->cols; i++)
@@ -2013,11 +2019,11 @@ static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 		    term->selend.x = 0;
 		}
 	    }
-
-	    lines++;
 	}
     } else {
-	while (lines > 0) {
+        if (lines > scrollwinsize)
+            lines = scrollwinsize;
+	while (lines-- > 0) {
 	    line = delpos234(term->screen, topline);
 #ifdef TERM_CC_DIAGS
 	    cc_check(line);
@@ -2103,8 +2109,6 @@ static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 		    }
 		}
 	    }
-
-	    lines--;
 	}
     }
 #ifdef OPTIMISE_SCROLL
@@ -5622,7 +5626,8 @@ static pos sel_spread_half(Terminal *term, pos p, int dir)
 		    else
 			break;
 		} else {
-		    if (ldata->lattr & LATTR_WRAPPED) {
+		    if (p.y+1 < term->rows && 
+                        (ldata->lattr & LATTR_WRAPPED)) {
 			termline *ldata2;
 			ldata2 = lineptr(p.y+1);
 			if (wordtype(term, UCSGET(ldata2->chars, 0))