--- fileio.c.orig	Thu Dec 27 12:38:45 2001
+++ fileio.c	Thu Dec 27 13:15:17 2001
@@ -46,14 +46,18 @@
 	}
 }
 
+#define BLOCK_SIZE 4096
+
 void expand_file(int fd, int size)
 {
-	int s;
-	while (size) {
-		s = MIN(sizeof(buf), size);
-		write(fd, buf, s);
-		size -= s;
+	int i;
+
+	for (i = 0; i < size; i += BLOCK_SIZE) {
+		lseek(fd, i, SEEK_SET);
+		write(fd, buf, 1);
 	}
+	lseek(fd, size-1, SEEK_SET);
+	write(fd, buf, 1);
 }
 
 void nb_open(char *fname, int handle, int size)
@@ -101,7 +105,7 @@
 
 void nb_write(int handle, int size, int offset)
 {
-	int i;
+	int i, off;
 
 	if (buf[0] == 0) memset(buf, 1, sizeof(buf));
 
@@ -115,15 +119,22 @@
 #endif
 		return;
 	}
-	lseek(ftable[i].fd, offset, SEEK_SET);
-	if (write(ftable[i].fd, buf, size) != size) {
+	for (off = 0; off < size; off += BLOCK_SIZE) {
+		lseek(ftable[i].fd, offset + off, SEEK_SET);
+		if (write(ftable[i].fd, buf, 1) != 1) {
+			printf("write failed on handle %d\n", handle);
+		}
+	}
+	lseek(ftable[i].fd, offset + size-1, SEEK_SET);
+	if (write(ftable[i].fd, buf, 1) != 1) {
 		printf("write failed on handle %d\n", handle);
 	}
 }
 
 void nb_read(int handle, int size, int offset)
 {
-	int i;
+	int i, off;
+
 	for (i=0;i<MAX_FILES;i++) {
 		if (ftable[i].handle == handle) break;
 	}
@@ -132,8 +143,14 @@
 		       line_count, handle, size, offset);
 		return;
 	}
-	lseek(ftable[i].fd, offset, SEEK_SET);
-	read(ftable[i].fd, buf, size);
+	for (off = 0; off < size; off += BLOCK_SIZE) {
+		lseek(ftable[i].fd, offset + off, SEEK_SET);
+		read(ftable[i].fd, buf, 1);
+	}
+	if (off != size) {
+		lseek(ftable[i].fd, offset + size-1, SEEK_SET);
+		read(ftable[i].fd, buf, 1);
+	}
 }
 
 void nb_close(int handle)