Index: ul.c
===================================================================
--- ul.c	(revision 301965)
+++ ul.c	(working copy)
@@ -78,7 +78,9 @@
 	int	c_width;	/* width or -1 if multi-column char. filler */
 } ;
 
-static struct	CHAR	obuf[MAXBUF];
+static struct	CHAR	sobuf[MAXBUF]; // static output buffer
+static struct	CHAR	*obuf = sobuf;
+static int	buflen = MAXBUF;
 static int	col, maxcol;
 static int	mode;
 static int	halfpos;
@@ -151,6 +153,9 @@
 		else
 			filter(f);
 	}
+	if (obuf != sobuf) {
+		free(obuf);
+	}
 	exit(0);
 }
 
@@ -166,9 +171,26 @@
 {
 	wint_t c;
 	int i, w;
+	int copy = 0;
 
-	while ((c = getwc(f)) != WEOF && col < MAXBUF) switch(c) {
-
+	while ((c = getwc(f)) != WEOF) {
+		if (col == buflen) {
+			if (obuf == sobuf) {
+				obuf = NULL;
+				copy = 1;
+			}
+			obuf = realloc(obuf, sizeof(*obuf) * 2 * buflen);
+			if (obuf == NULL) {
+				obuf = sobuf;
+				break;
+			} else if (copy) {
+				memcpy(obuf, sobuf, sizeof(*obuf) * buflen);
+				copy = 0;
+			}
+			bzero((char *)(obuf + buflen), sizeof(*obuf) * buflen);
+			buflen *= 2;
+		}
+		switch(c) {
 	case '\b':
 		if (col > 0)
 			col--;
@@ -289,6 +311,7 @@
 			maxcol = col;
 		continue;
 	}
+	}
 	if (ferror(f))
 		err(1, NULL);
 	if (maxcol)
@@ -405,7 +428,7 @@
 initbuf(void)
 {
 
-	bzero((char *)obuf, sizeof (obuf));	/* depends on NORMAL == 0 */
+	bzero((char *)obuf, buflen * sizeof(*obuf)); /* depends on NORMAL == 0 */
 	col = 0;
 	maxcol = 0;
 	mode &= ALTSET;