diff --git a/README b/README
index 979e80e..8f553a6 100644
--- a/README
+++ b/README
@@ -22,7 +22,7 @@
 0=*|o cksum           .
 0=*|o cmp             .
  #*|x cols            .
- =*|o comm            .
+0=*|o comm            .
 0=*|o cp              (-i)
 0=*|x cron            .
  #*|o cut             .
diff --git a/comm.c b/comm.c
index 4648d7d..b68f02d 100644
--- a/comm.c
+++ b/comm.c
@@ -3,12 +3,13 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "text.h"
 #include "util.h"
 
 static int show = 0x07;
 
 static void
-printline(int pos, char *line)
+printline(int pos, struct linebufline *line)
 {
 	int i;
 
@@ -19,7 +20,7 @@
 		if (show & (0x1 << i))
 			putchar('\t');
 	}
-	fputs(line, stdout);
+	fwrite(line->data, 1, line->len, stdout);
 }
 
 static void
@@ -32,9 +33,10 @@
 main(int argc, char *argv[])
 {
 	FILE *fp[2];
-	size_t linelen[2] = { 0, 0 };
+	static struct linebufline line[2];
+	size_t linecap[2] = { 0, 0 };
+	ssize_t len;
 	int ret = 0, i, diff = 0, seenline = 0;
-	char *line[2] = { NULL, NULL };
 
 	ARGBEGIN {
 	case '1':
@@ -62,24 +64,32 @@
 		for (i = 0; i < 2; i++) {
 			if (diff && i == (diff < 0))
 				continue;
-			if (getline(&line[i], &linelen[i], fp[i]) > 0) {
+			if ((len = getline(&(line[i].data), &linecap[i],
+			                   fp[i])) > 0) {
+				line[i].len = len;
 				seenline = 1;
 				continue;
 			}
 			if (ferror(fp[i]))
 				eprintf("getline %s:", argv[i]);
-			if ((diff || seenline) && line[!i][0])
-				printline(!i, line[!i]);
-			while (getline(&line[!i], &linelen[!i], fp[!i]) > 0)
-				printline(!i, line[!i]);
+			if ((diff || seenline) && line[!i].data[0])
+				printline(!i, &line[!i]);
+			while ((len = getline(&(line[!i].data), &linecap[!i],
+			                      fp[!i])) > 0) {
+				line[!i].len = len;
+				printline(!i, &line[!i]);
+			}
 			if (ferror(fp[!i]))
 				eprintf("getline %s:", argv[!i]);
 			goto end;
 		}
-		diff = strcmp(line[0], line[1]);
+		if (!(diff = memcmp(line[0].data, line[1].data,
+		                    MIN(line[0].len, line[1].len)))) {
+			diff = (line[0].len > line[1].len);
+		}
 		LIMIT(diff, -1, 1);
 		seenline = 0;
-		printline((2 - diff) % 3, line[MAX(0, diff)]);
+		printline((2 - diff) % 3, &line[MAX(0, diff)]);
 	}
 end:
 	ret |= fshut(fp[0], argv[0]);