avoid pointer arithmetic involving NULL in FLEX_ALLOC_MEM

diff --git a/ref-filter.c b/ref-filter.c
index e205dd2f689ee5aeafe6ea66343fd01b85d2e354..9ccfc51ceadb79fdf376da79741c9693db8513bb 100644 (file)
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -372,7 +372,7 @@ static void grab_common_values(struct atom_value *val, int deref, struct object
                        v->s = xstrfmt("%lu", sz);
                }
                else if (deref)
-                       grab_objectname(name, obj->sha1, v);
+                       grab_objectname(name, obj->oid.hash, v);
        }
 }
 
@@ -394,7 +394,7 @@ static void grab_tag_values(struct atom_value *val, int deref, struct object *ob
                else if (!strcmp(name, "type") && tag->tagged)
                        v->s = typename(tag->tagged->type);
                else if (!strcmp(name, "object") && tag->tagged)
-                       v->s = xstrdup(sha1_to_hex(tag->tagged->sha1));
+                       v->s = xstrdup(oid_to_hex(&tag->tagged->oid));
        }
 }
 
@@ -412,7 +412,7 @@ static void grab_commit_values(struct atom_value *val, int deref, struct object
                if (deref)
                        name++;
                if (!strcmp(name, "tree")) {
-                       v->s = xstrdup(sha1_to_hex(commit->tree->object.sha1));
+                       v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
                }
                else if (!strcmp(name, "numparent")) {
                        v->ul = commit_list_count(commit->parents);
@@ -425,7 +425,7 @@ static void grab_commit_values(struct atom_value *val, int deref, struct object
                                struct commit *parent = parents->item;
                                if (parents != commit->parents)
                                        strbuf_addch(&s, ' ');
-                               strbuf_addstr(&s, sha1_to_hex(parent->object.sha1));
+                               strbuf_addstr(&s, oid_to_hex(&parent->object.oid));
                        }
                        v->s = strbuf_detach(&s, NULL);
                }
@@ -763,6 +763,29 @@ static inline char *copy_advance(char *dst, const char *src)
        return dst;
 }
 
+static const char *strip_ref_components(const char *refname, const char *nr_arg)
+{
+       char *end;
+       long nr = strtol(nr_arg, &end, 10);
+       long remaining = nr;
+       const char *start = refname;
+
+       if (nr < 1 || *end != '\0')
+               die(":strip= requires a positive integer argument");
+
+       while (remaining) {
+               switch (*start++) {
+               case '\0':
+                       die("ref '%s' does not have %ld components to :strip",
+                           refname, nr);
+               case '/':
+                       remaining--;
+                       break;
+               }
+       }
+       return start;
+}
+
 /*
  * Parse the object referred by ref, and grab needed value.
  */
@@ -909,11 +932,14 @@ static void populate_value(struct ref_array_item *ref)
                formatp = strchr(name, ':');
                if (formatp) {
                        int num_ours, num_theirs;
+                       const char *arg;
 
                        formatp++;
                        if (!strcmp(formatp, "short"))
                                refname = shorten_unambiguous_ref(refname,
                                                      warn_ambiguous_refs);
+                       else if (skip_prefix(formatp, "strip=", &arg))
+                               refname = strip_ref_components(refname, arg);
                        else if (!strcmp(formatp, "track") &&
                                 (starts_with(name, "upstream") ||
                                  starts_with(name, "push"))) {
@@ -992,7 +1018,7 @@ static void populate_value(struct ref_array_item *ref)
         * If it is a tag object, see if we use a value that derefs
         * the object, and if we do grab the object it refers to.
         */
-       tagged = ((struct tag *)obj)->tagged->sha1;
+       tagged = ((struct tag *)obj)->tagged->oid.hash;
 
        /*
         * NEEDSWORK: This derefs tag only once, which
@@ -1049,7 +1075,7 @@ struct contains_stack {
 static int in_commit_list(const struct commit_list *want, struct commit *c)
 {
        for (; want; want = want->next)
-               if (!hashcmp(want->item->object.sha1, c->object.sha1))
+               if (!oidcmp(&want->item->object.oid, &c->object.oid))
                        return 1;
        return 0;
 }
@@ -1218,7 +1244,7 @@ static const unsigned char *match_points_at(struct sha1_array *points_at,
        if (!obj)
                die(_("malformed object at '%s'"), refname);
        if (obj->type == OBJ_TAG)
-               tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
+               tagged_sha1 = ((struct tag *)obj)->tagged->oid.hash;
        if (tagged_sha1 && sha1_array_lookup(points_at, tagged_sha1) >= 0)
                return tagged_sha1;
        return NULL;
@@ -1229,10 +1255,8 @@ static struct ref_array_item *new_ref_array_item(const char *refname,
                                                 const unsigned char *objectname,
                                                 int flag)
 {
-       size_t len = strlen(refname);
-       struct ref_array_item *ref = xcalloc(1, sizeof(struct ref_array_item) + len + 1);
-       memcpy(ref->refname, refname, len);
-       ref->refname[len] = '\0';
+       struct ref_array_item *ref;
+       FLEX_ALLOC_STR(ref, refname, refname);
        hashcpy(ref->objectname, objectname);
        ref->flag = flag;