git-compat-util: add xstrdup_or_null helper

diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 4135980f20786ef3320e334c4001fd67fc169056..fda0f047125f16f080288c1cda76b0e337784a54 100644 (file)
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -138,10 +138,8 @@ static int parse_atom(const char *atom, const char *ep)
        /* Add it in, including the deref prefix */
        at = used_atom_cnt;
        used_atom_cnt++;
-       used_atom = xrealloc(used_atom,
-                            (sizeof *used_atom) * used_atom_cnt);
-       used_atom_type = xrealloc(used_atom_type,
-                                 (sizeof(*used_atom_type) * used_atom_cnt));
+       REALLOC_ARRAY(used_atom, used_atom_cnt);
+       REALLOC_ARRAY(used_atom_type, used_atom_cnt);
        used_atom[at] = xmemdupz(atom, ep - atom);
        used_atom_type[at] = valid_atom[i].cmp_type;
        if (*atom == '*')
@@ -283,18 +281,6 @@ static void grab_tag_values(struct atom_value *val, int deref, struct object *ob
        }
 }
 
-static int num_parents(struct commit *commit)
-{
-       struct commit_list *parents;
-       int i;
-
-       for (i = 0, parents = commit->parents;
-            parents;
-            parents = parents->next)
-               i++;
-       return i;
-}
-
 /* See grab_values */
 static void grab_commit_values(struct atom_value *val, int deref, struct object *obj, void *buf, unsigned long sz)
 {
@@ -315,12 +301,12 @@ static void grab_commit_values(struct atom_value *val, int deref, struct object
                }
                if (!strcmp(name, "numparent")) {
                        char *s = xmalloc(40);
-                       v->ul = num_parents(commit);
+                       v->ul = commit_list_count(commit->parents);
                        sprintf(s, "%lu", v->ul);
                        v->s = s;
                }
                else if (!strcmp(name, "parent")) {
-                       int num = num_parents(commit);
+                       int num = commit_list_count(commit->parents);
                        int i;
                        struct commit_list *parents;
                        char *s = xmalloc(41 * num + 1);
@@ -645,7 +631,7 @@ static void populate_value(struct refinfo *ref)
        unsigned long size;
        const unsigned char *tagged;
 
-       ref->value = xcalloc(sizeof(struct atom_value), used_atom_cnt);
+       ref->value = xcalloc(used_atom_cnt, sizeof(struct atom_value));
 
        if (need_symref && (ref->flag & REF_ISSYMREF) && !ref->symref) {
                unsigned char unused1[20];
@@ -882,8 +868,7 @@ static int grab_single_ref(const char *refname, const unsigned char *sha1, int f
        ref->flag = flag;
 
        cnt = cb->grab_cnt;
-       cb->grab_array = xrealloc(cb->grab_array,
-                                 sizeof(*cb->grab_array) * (cnt + 1));
+       REALLOC_ARRAY(cb->grab_array, cnt + 1);
        cb->grab_array[cnt++] = ref;
        cb->grab_cnt = cnt;
        return 0;