1 files changed, 10 insertions, 4 deletions

diff --git a/coreutils/md5_sha1_sum.c b/coreutils/md5_sha1_sum.c
index 4506aeb56..ee6bda6fd 100644
--- a/coreutils/md5_sha1_sum.c
+++ b/coreutils/md5_sha1_sum.c
@@ -159,6 +159,7 @@ enum {
 #define FLAG_SILENT  1
 #define FLAG_CHECK   2
 #define FLAG_WARN    4
+#define FLAG_BINARY  8
 
 /* This might be useful elsewhere */
 static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
@@ -281,16 +282,21 @@ int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
 #if ENABLE_SHA3SUM
         unsigned sha3_width = 224;
 #endif
+        const char *fmt = "%s  %s\n";
 
         if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) {
-                /* -b "binary", -t "text" are ignored (shaNNNsum compat) */
+                /* -t per se is a no-op (it means "text mode").
+                 * -b sets the '*' binary mode indicator in the output.
+                 * -t unsets -b (-bt is the same as -t, which is the same as no option) */
                 /* -s and -w require -c */
 #if ENABLE_SHA3SUM
                 if (applet_name[3] == HASH_SHA3 && (!ENABLE_SHA384SUM || applet_name[4] != '8'))
-                        flags = getopt32(argv, "^" "scwbta:+" "\0" "s?c:w?c", &sha3_width);
+                        flags = getopt32(argv, "^" "scwbta:+" "\0" "t-b:s?c:w?c", &sha3_width);
                 else
 #endif
-                        flags = getopt32(argv, "^" "scwbt" "\0" "s?c:w?c");
+                        flags = getopt32(argv, "^" "scwbt" "\0" "t-b:s?c:w?c");
+                if (flags & FLAG_BINARY)
+                        fmt = "%s *%s\n";
         } else {
 #if ENABLE_SHA3SUM
                 if (applet_name[3] == HASH_SHA3 && (!ENABLE_SHA384SUM || applet_name[4] != '8'))
@@ -375,7 +381,7 @@ int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
                         if (hash_value == NULL) {
                                 return_value = EXIT_FAILURE;
                         } else {
-                                printf("%s  %s\n", hash_value, *argv);
+                                printf(fmt, hash_value, *argv);
                                 free(hash_value);
                         }
                 }