Index: bin/sh/input.c
===================================================================
--- bin/sh/input.c
+++ bin/sh/input.c
@@ -38,7 +38,6 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <stdio.h>	/* defines BUFSIZ */
 #include <fcntl.h>
 #include <errno.h>
 #include <unistd.h>
@@ -62,6 +61,8 @@
 #include "myhistedit.h"
 #include "trap.h"
 
+#define INBUFSIZ (128 * 1024)
+
 #define EOF_NLEFT -99		/* value of parsenleft when EOF pushed back */
 
 struct strpush {
@@ -94,7 +95,7 @@
 int parsenleft;			/* copy of parsefile->nleft */
 static int parselleft;		/* copy of parsefile->lleft */
 const char *parsenextc;		/* copy of parsefile->nextc */
-static char basebuf[BUFSIZ + 1];/* buffer for top level input file */
+static char basebuf[INBUFSIZ + 1];/* buffer for top level input file */
 static struct parsefile basepf = {	/* top level input file */
 	.nextc = basebuf,
 	.buf = basebuf
@@ -149,8 +150,8 @@
 			nr = el_len == 0 ? 0 : -1;
 		else {
 			nr = el_len;
-			if (nr > BUFSIZ)
-				nr = BUFSIZ;
+			if (nr > INBUFSIZ)
+				nr = INBUFSIZ;
 			memcpy(parsefile->buf, rl_cp, nr);
 			if (nr != el_len) {
 				el_len -= nr;
@@ -160,7 +161,7 @@
 		}
 	} else
 #endif
-		nr = read(parsefile->fd, parsefile->buf, BUFSIZ);
+		nr = read(parsefile->fd, parsefile->buf, INBUFSIZ);
 
 	if (nr <= 0) {
                 if (nr < 0) {
@@ -387,13 +388,13 @@
 {
 	if (push) {
 		pushfile();
-		parsefile->buf = ckmalloc(BUFSIZ + 1);
+		parsefile->buf = ckmalloc(INBUFSIZ + 1);
 	}
 	if (parsefile->fd > 0)
 		close(parsefile->fd);
 	parsefile->fd = fd;
 	if (parsefile->buf == NULL)
-		parsefile->buf = ckmalloc(BUFSIZ + 1);
+		parsefile->buf = ckmalloc(INBUFSIZ + 1);
 	parselleft = parsenleft = 0;
 	plinno = 1;
 }