use pop_commit() for consuming the first entry of a struct commit_listrs/pop-commit

Instead of open-coding the function pop_commit() just call it.  This
makes the intent clearer and reduces code size.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

5 files changed, 14 insertions, 37 deletions

diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 05f4c26311..46c92c174f 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -536,7 +536,7 @@ static void fmt_merge_msg_sigs(struct strbuf *out)
 static void find_merge_parents(struct merge_parents *result,
 			       struct strbuf *in, unsigned char *head)
 {
-	struct commit_list *parents, *next;
+	struct commit_list *parents;
 	struct commit *head_commit;
 	int pos = 0, i, j;
 
@@ -575,13 +575,10 @@ static void find_merge_parents(struct merge_parents *result,
 	parents = reduce_heads(parents);
 
 	while (parents) {
+		struct commit *cmit = pop_commit(&parents);
 		for (i = 0; i < result->nr; i++)
-			if (!hashcmp(result->item[i].commit,
-				     parents->item->object.sha1))
+			if (!hashcmp(result->item[i].commit, cmit->object.sha1))
 				result->item[i].used = 1;
-		next = parents->next;
-		free(parents);
-		parents = next;
 	}
 
 	for (i = j = 0; i < result->nr; i++) {
diff --git a/builtin/merge.c b/builtin/merge.c
index 85c54dcd5a..63563b9ab0 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1019,7 +1019,7 @@ static struct commit_list *reduce_parents(struct commit *head_commit,
 					  int *head_subsumed,
 					  struct commit_list *remoteheads)
 {
-	struct commit_list *parents, *next, **remotes = &remoteheads;
+	struct commit_list *parents, **remotes;
 
 	/*
 	 * Is the current HEAD reachable from another commit being
@@ -1033,16 +1033,14 @@ static struct commit_list *reduce_parents(struct commit *head_commit,
 	/* Find what parents to record by checking independent ones. */
 	parents = reduce_heads(remoteheads);
 
-	for (remoteheads = NULL, remotes = &remoteheads;
-	     parents;
-	     parents = next) {
-		struct commit *commit = parents->item;
-		next = parents->next;
+	remoteheads = NULL;
+	remotes = &remoteheads;
+	while (parents) {
+		struct commit *commit = pop_commit(&parents);
 		if (commit == head_commit)
 			*head_subsumed = 0;
 		else
 			remotes = &commit_list_insert(commit, remotes)->next;
-		free(parents);
 	}
 	return remoteheads;
 }
diff --git a/builtin/reflog.c b/builtin/reflog.c
index c2eb8ff840..fa841b500b 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -216,7 +216,6 @@ static int keep_entry(struct commit **it, unsigned char *sha1)
  */
 static void mark_reachable(struct expire_reflog_policy_cb *cb)
 {
-	struct commit *commit;
 	struct commit_list *pending;
 	unsigned long expire_limit = cb->mark_limit;
 	struct commit_list *leftover = NULL;
@@ -226,11 +225,8 @@ static void mark_reachable(struct expire_reflog_policy_cb *cb)
 
 	pending = cb->mark_list;
 	while (pending) {
-		struct commit_list *entry = pending;
 		struct commit_list *parent;
-		pending = entry->next;
-		commit = entry->item;
-		free(entry);
+		struct commit *commit = pop_commit(&pending);
 		if (commit->object.flags & REACHABLE)
 			continue;
 		if (parse_commit(commit))
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 02d747dcb1..e92a782f77 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -281,11 +281,8 @@ static int try_difference(const char *arg)
 			b = lookup_commit_reference(end);
 			exclude = get_merge_bases(a, b);
 			while (exclude) {
-				struct commit_list *n = exclude->next;
-				show_rev(REVERSED,
-					 exclude->item->object.sha1,NULL);
-				free(exclude);
-				exclude = n;
+				struct commit *commit = pop_commit(&exclude);
+				show_rev(REVERSED, commit->object.sha1, NULL);
 			}
 		}
 		*dotdot = '.';
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 344ae4ce2a..5cc6ad19b9 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -53,17 +53,6 @@ static struct commit *interesting(struct commit_list *list)
 	return NULL;
 }
 
-static struct commit *pop_one_commit(struct commit_list **list_p)
-{
-	struct commit *commit;
-	struct commit_list *list;
-	list = *list_p;
-	commit = list->item;
-	*list_p = list->next;
-	free(list);
-	return commit;
-}
-
 struct commit_name {
 	const char *head_name; /* which head's ancestor? */
 	int generation; /* how many parents away from head_name */
@@ -213,7 +202,7 @@ static void join_revs(struct commit_list **list_p,
 	while (*list_p) {
 		struct commit_list *parents;
 		int still_interesting = !!interesting(*list_p);
-		struct commit *commit = pop_one_commit(list_p);
+		struct commit *commit = pop_commit(list_p);
 		int flags = commit->object.flags & all_mask;
 
 		if (!still_interesting && extra <= 0)
@@ -504,7 +493,7 @@ static int show_merge_base(struct commit_list *seen, int num_rev)
 	int exit_status = 1;
 
 	while (seen) {
-		struct commit *commit = pop_one_commit(&seen);
+		struct commit *commit = pop_commit(&seen);
 		int flags = commit->object.flags & all_mask;
 		if (!(flags & UNINTERESTING) &&
 		    ((flags & all_revs) == all_revs)) {
@@ -926,7 +915,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 	all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 
 	while (seen) {
-		struct commit *commit = pop_one_commit(&seen);
+		struct commit *commit = pop_commit(&seen);
 		int this_flag = commit->object.flags;
 		int is_merge_point = ((this_flag & all_revs) == all_revs);