Allow the unarchive() extract_list variable to be NULL, meaning extract all

2 files changed, 14 insertions, 11 deletions

diff --git a/archival/ar.c b/archival/ar.c
index 2a764ff..7f3396c 100644
--- a/archival/ar.c
+++ b/archival/ar.c
@@ -70,17 +70,17 @@ extern int ar_main(int argc, char **argv)
 
 	/* check ar magic */
 	fread(ar_magic, 1, 8, src_stream);
+	archive_offset = 8;
 	if (strncmp(ar_magic,"!<arch>",7) != 0) {
 		error_msg_and_die("invalid magic");
 	}
-	archive_offset = 8;
 
-	extract_names = malloc(sizeof(char *));
-	extract_names[0] = NULL;
+	/* Create a list of files to extract */
 	while (optind < argc) {
+		extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
+		extract_names[num_of_entries] = xstrdup(argv[optind]);
 		num_of_entries++;
-		*extract_names = realloc(*extract_names, num_of_entries);
-		extract_names[num_of_entries - 1] = xstrdup(argv[optind]);
+		extract_names[num_of_entries] = NULL;
 		optind++;
 	}
 
diff --git a/archival/cpio.c b/archival/cpio.c
index 12a4340..7f68715 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -68,25 +68,28 @@ extern int cpio_main(int argc, char **argv)
 		}
 	}
 
-	if (extract_function & extract_all_to_fs && extract_function & extract_list) {
+	if ((extract_function & extract_all_to_fs) && (extract_function & extract_list)) {
 		extract_function ^= extract_all_to_fs; /* If specify t, don't extract*/
 	}
 
-	if (extract_function & extract_all_to_fs && extract_function & extract_verbose_list) { /* The meaning of v changes on extract */
+	if ((extract_function & extract_all_to_fs) && (extract_function & extract_verbose_list)) {
+		/* The meaning of v changes on extract */
 		extract_function ^= extract_verbose_list;
 		extract_function |= extract_list;
 	}
 
-	extract_names = malloc(4);
 	while (optind < argc) {
+		extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
+		extract_names[num_of_entries] = xstrdup(argv[optind]);
 		num_of_entries++;
-		*extract_names = realloc(*extract_names, num_of_entries);
-		extract_names[num_of_entries - 1] = xstrdup(argv[optind]);
+		extract_names[num_of_entries] = NULL;
 		optind++;
 	}
 
 	unarchive(src_stream, stdout, &get_header_cpio, extract_function, "./", extract_names);
-	if (oldmask) umask(oldmask); /* Restore umask if we changed it */
+	if (oldmask) {
+		umask(oldmask); /* Restore umask if we changed it */
+	}
 	return EXIT_SUCCESS;
 }