entry.c: convert strcpy to xsnprintf

This particular conversion is non-obvious, because nobody
has passed our function the length of the destination
buffer. However, the interface to checkout_entry specifies
that the buffer must be at least TEMPORARY_FILENAME_LENGTH
bytes long, so we can check that (meaning the existing code
was not buggy, but merely worrisome to somebody reading it).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/entry.c b/entry.c
index 1eda8e94714bbd6020d61b4b627f721b1042673c..582c40071a3034af9a391cf438dd74ddb34e15ff 100644 (file)
--- a/entry.c
+++ b/entry.c
@@ -96,8 +96,8 @@ static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempf
 {
        int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
        if (to_tempfile) {
-               strcpy(path, symlink
-                      ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
+               xsnprintf(path, TEMPORARY_FILENAME_LENGTH, "%s",
+                         symlink ? ".merge_link_XXXXXX" : ".merge_file_XXXXXX");
                return mkstemp(path);
        } else {
                return create_file(path, !symlink ? ce->ce_mode : 0666);