Exit status 2 for bad checksums, print report with -t.

1 files changed, 14 insertions, 1 deletions

diff --git a/src/extract.c b/src/extract.c
index 31559cf..9c45941 100644
--- a/src/extract.c
+++ b/src/extract.c
@@ -7,6 +7,7 @@
 #include "unalf.h"
 #include "addrs.h"
 
+int bad_checksum, bad_checksum_count = 0;
 char *out_filename;
 
 void dpoke(int addr, u16 value) {
@@ -87,15 +88,27 @@ void extract_alf(void) {
 			out_filename = realname;
 		}
 
+		bad_checksum = 0;
 		uncrunch_file();
+		if(bad_checksum) bad_checksum_count++;
 
 		if(!opts.extract_to_stdout) fclose(out_file);
 		out_filename = 0;
 	}
+
+	if(opts.testonly && !opts.quiet) {
+		if(bad_checksum_count)
+			printf("%d file%s with bad checksum!\n",
+					bad_checksum_count,
+					bad_checksum_count == 1 ? "" : "s");
+		else
+			printf("All files OK.\n");
+	}
 }
 
 static void chksum_err(void) {
-	fprintf(stderr, "%s: checksum error on file %s\n", self, out_filename);
+	bad_checksum = 1;
+	fprintf(stderr, "%s: checksum error on %s\n", self, out_filename);
 }
 
 void uncrunch_file(void) {