tal/path: handle weird case of path_join("")

[ccan] / ccan / tal / path / path.c

diff --git a/ccan/tal/path/path.c b/ccan/tal/path/path.c
index 362152d29cb261747f60a46d14db60addd6b928b..c7a134e3c9d9981699f9c95e4ad10fde71b9fa7d 100644 (file)
--- a/ccan/tal/path/path.c
+++ b/ccan/tal/path/path.c
@@ -52,7 +52,7 @@ char *path_join(const tal_t *ctx, const char *base, const char *a)
        ret = tal_dup_arr(ctx, char, base, len, 1 + strlen(a) + 1);
        if (!ret)
                goto out;
-       if (ret[len-1] != PATH_SEP)
+       if (len != 0 && ret[len-1] != PATH_SEP)
                ret[len++] = PATH_SEP;
        strcpy(ret + len, a);