fix parsing of @{-1}@{u} combination

diff --git a/sha1_name.c b/sha1_name.c
index c7f1510ef102512f1270a064fbb7a842b1d9aed9..00fc4151780a4e66b70a78ac30d4798ad69b976e 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -881,8 +881,28 @@ int interpret_branch_name(const char *name, struct strbuf *buf)
 
        if (!len)
                return len; /* syntax Ok, not enough switches */
-       if (0 < len)
-               return len; /* consumed from the front */
+       if (0 < len && len == namelen)
+               return len; /* consumed all */
+       else if (0 < len) {
+               /* we have extra data, which might need further processing */
+               struct strbuf tmp = STRBUF_INIT;
+               int used = buf->len;
+               int ret;
+
+               strbuf_add(buf, name + len, namelen - len);
+               ret = interpret_branch_name(buf->buf, &tmp);
+               /* that data was not interpreted, remove our cruft */
+               if (ret < 0) {
+                       strbuf_setlen(buf, used);
+                       return len;
+               }
+               strbuf_reset(buf);
+               strbuf_addbuf(buf, &tmp);
+               strbuf_release(&tmp);
+               /* tweak for size of {-N} versus expanded ref name */
+               return ret - used + len;
+       }
+
        cp = strchr(name, '@');
        if (!cp)
                return -1;