unprotbas: with -v, show whether trailing garbage is all zeroes.

1 files changed, 9 insertions, 3 deletions

diff --git a/unprotbas.c b/unprotbas.c
index bf1fb7e..6dd263c 100644
--- a/unprotbas.c
+++ b/unprotbas.c
@@ -235,11 +235,17 @@ int fixcode(void) {
 	if(verbose) fprintf(stderr, "End program pos $%04x/%d\n", pos, pos);
 
 	if(filelen > pos) {
-		if(verbose) fprintf(stderr, "trailing garbage at EOF, %d bytes, %s\n",
-				filelen - pos, (keepgarbage ? "keeping" : "removing"));
+		int i, nonzero = 0;
+		for(i = pos; i < filelen; i++)
+			if(data[i]) nonzero = 1;
+		if(verbose) {
+			fprintf(stderr, "trailing garbage at EOF, %d bytes, %s, %s\n",
+				filelen - pos,
+				nonzero ? "maybe valid data" : "all zeroes",
+				(keepgarbage ? "keeping" : "removing"));
+		}
 		if(!keepgarbage) filelen = pos;
 	}
-
 	return result;
 }