ref-filter: drop sprintf and strcpy calls

diff --git a/sha1_file.c b/sha1_file.c
index 592226eb7bb9e961b357b11f678773f7ac74ab6f..2be1afdde0b1bde19583ad8fa183fb7f2546cc13 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -671,13 +671,15 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
 int open_pack_index(struct packed_git *p)
 {
        char *idx_name;
+       size_t len;
        int ret;
 
        if (p->index_data)
                return 0;
 
-       idx_name = xstrdup(p->pack_name);
-       strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx");
+       if (!strip_suffix(p->pack_name, ".pack", &len))
+               die("BUG: pack_name does not end in .pack");
+       idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
        ret = check_packed_git_idx(idx_name, p);
        free(idx_name);
        return ret;