http://lists.research.att.com/pipermail/ast-developers/2014q1/003807.html
---
diff --git a/src/cmd/ksh93/edit/edit.c b/src/cmd/ksh93/edit/edit.c
index 769ba2e..4f6330e 100644
--- a/src/cmd/ksh93/edit/edit.c
+++ b/src/cmd/ksh93/edit/edit.c
@@ -651,7 +651,8 @@ void	ed_setup(register Edit_t *ep, int fd, int reedit)
 			{
 				int skip=0;
 				ep->e_crlf = 0;
-				*pp++ = c;
+				if (pp < ppmax)
+					*pp++ = c;
 				for(n=1; c = *last++; n++)
 				{
 					if(pp < ppmax)
diff --git a/src/cmd/ksh93/include/edit.h b/src/cmd/ksh93/include/edit.h
index 795777d..145066d 100644
--- a/src/cmd/ksh93/include/edit.h
+++ b/src/cmd/ksh93/include/edit.h
@@ -59,7 +59,7 @@
 #endif /* SHOPT_MULTIBYTE */
 
 #define TABSIZE	8
-#define PRSIZE	160
+#define PRSIZE	256
 #define MAXLINE	1024		/* longest edit line permitted */
 
 typedef struct _edit_pos