diff -Naur old/ftp_var.h ftp/ftp_var.h
--- old/ftp_var.h	2003-11-01 13:51:09.000000000 -0600
+++ ftp/ftp_var.h	2003-11-01 13:17:56.000000000 -0600
@@ -41,6 +41,9 @@
 #ifndef FTP_EXTERN
 #define FTP_EXTERN extern
 #endif
+
+#define MAXLINE 200
+
 /*
  * Options and other state info.
  */
@@ -95,11 +98,11 @@
 #if HAVE_LIBREADLINE
 FTP_EXTERN char *line;
 #else
-FTP_EXTERN char	line[200];	/* input line buffer */
+FTP_EXTERN char	line[MAXLINE];	/* input line buffer */
 #endif
 
 FTP_EXTERN char	*stringbase;	/* current scan point in line buffer */
-FTP_EXTERN char	argbuf[200];	/* argument storage buffer */
+FTP_EXTERN char	argbuf[MAXLINE];	/* argument storage buffer */
 FTP_EXTERN char	*argbase;	/* current storage point in arg buffer */
 FTP_EXTERN int	margc;		/* count of arguments on input line */
 FTP_EXTERN char	*margv[20];	/* args parsed from input line */
diff -Naur old/main.c ftp/main.c
--- old/main.c	2003-11-01 13:51:09.000000000 -0600
+++ ftp/main.c	2003-11-01 14:04:40.000000000 -0600
@@ -317,9 +317,14 @@
       line = readline (prompt);
       if (!line)
 	quit (0, 0);
+      l = strlen (line);
+      if (l >= MAXLINE)
+	{
+	  printf("Line too long.\n");
+	  break;
+	}
       if (line && *line)
 	add_history (line);
-      l = strlen (line);
       if (l == 0)
 	break;
 #else