From b2844d89acbc3e50df443d78a97507aca918ebd2 Mon Sep 17 00:00:00 2001
From: Vince Weaver <vincent.weaver@maine.edu>
Date: Fri, 16 Aug 2019 09:58:03 -0400
Subject: [PATCH] dos33: add error message instead of hanging if reading too
 far in VTOC

was trying to use some unused parts of track $11, didn't go well
---
 dos33fs-utils/dos33.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dos33fs-utils/dos33.c b/dos33fs-utils/dos33.c
index 278f4dba..30374f99 100644
--- a/dos33fs-utils/dos33.c
+++ b/dos33fs-utils/dos33.c
@@ -693,6 +693,11 @@ continue_parsing_catalog:
           /* Read in Catalog Sector */
 	lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
 	result=read(fd,sector_buffer,BYTES_PER_SECTOR);
+	if (result!=BYTES_PER_SECTOR) {
+		fprintf(stderr,"Error reading at $%02X:$%02X\n",
+			catalog_track,catalog_sector);
+		return ERROR_NO_SPACE;
+	}
 
 	/* Find empty directory entry */
 	i=0;