describe: Do not use a flex array in struct commit_name

Now add_to_known_names overwrites commit_names in place when multiple
tags point to the same commit.  This will make it easier to store
commit_names in a hash table.

Signed-off-by: Anders Kaseorg <andersk@ksplice.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/describe.c b/builtin/describe.c
index 700f740..5b8461d 100644 (file)
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -38,7 +38,7 @@ struct commit_name {
        unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
        unsigned name_checked:1;
        unsigned char sha1[20];
-       char path[FLEX_ARRAY]; /* more */
+       const char *path;
 };
 static const char *prio_names[] = {
        "head", "lightweight", "annotated",
@@ -85,15 +85,15 @@ static void add_to_known_names(const char *path,
        struct commit_name *e = commit->util;
        struct tag *tag = NULL;
        if (replace_name(e, prio, sha1, &tag)) {
-               size_t len = strlen(path)+1;
-               free(e);
-               e = xmalloc(sizeof(struct commit_name) + len);
+               if (!e) {
+                       e = xmalloc(sizeof(struct commit_name));
+                       commit->util = e;
+               }
                e->tag = tag;
                e->prio = prio;
                e->name_checked = 0;
                hashcpy(e->sha1, sha1);
-               memcpy(e->path, path, len);
-               commit->util = e;
+               e->path = path;
        }
        found_names = 1;
 }