Eliminate a segfault when called on an existing file with out an extension:
touch foo && gunzip foo
diff --git a/archival/gunzip.c b/archival/gunzip.c
index c3960e9..65f4356 100644
--- a/archival/gunzip.c
+++ b/archival/gunzip.c
@@ -158,9 +158,9 @@
delete_old_file = TRUE;
extension = strrchr(if_name, '.');
- if (strcmp(extension, ".gz") == 0) {
+ if (extension && strcmp(extension, ".gz") == 0) {
length -= 3;
- } else if (strcmp(extension, ".tgz") == 0) {
+ } else if (extension && strcmp(extension, ".tgz") == 0) {
length -= 4;
} else {
error_msg_and_die("Invalid extension");