diff --git a/include/git2/diff.h b/include/git2/diff.h
index 0e7c02fd0..ba2e21c27 100644
--- a/include/git2/diff.h
+++ b/include/git2/diff.h
@@ -55,8 +55,8 @@ typedef struct {
 	uint32_t flags;				/**< defaults to GIT_DIFF_NORMAL */
 	uint16_t context_lines;		/**< defaults to 3 */
 	uint16_t interhunk_lines;	/**< defaults to 3 */
-	char *src_prefix;			/**< defaults to "a" */
-	char *dst_prefix;			/**< defaults to "b" */
+	char *old_prefix;			/**< defaults to "a" */
+	char *new_prefix;			/**< defaults to "b" */
 	git_strarray pathspec;		/**< defaults to show all paths */
 } git_diff_options;
 
@@ -113,11 +113,11 @@ typedef struct {
  * It will just use the git attributes for those files.
  */
 typedef struct {
-	git_diff_file old;
-	git_diff_file new;
+	git_diff_file old_file;
+	git_diff_file new_file;
 	git_delta_t   status;
-	unsigned int similarity; /**< for RENAMED and COPIED, value from 0 to 100 */
-	int binary;
+	unsigned int  similarity; /**< for RENAMED and COPIED, value 0-100 */
+	int           binary;
 } git_diff_delta;
 
 /**
@@ -209,15 +209,15 @@ GIT_EXTERN(void) git_diff_list_free(git_diff_list *diff);
  *
  * @param repo The repository containing the trees.
  * @param opts Structure with options to influence diff or NULL for defaults.
- * @param old A git_tree object to diff from.
- * @param new A git_tree object to diff to.
+ * @param old_tree A git_tree object to diff from.
+ * @param new_tree A git_tree object to diff to.
  * @param diff A pointer to a git_diff_list pointer that will be allocated.
  */
 GIT_EXTERN(int) git_diff_tree_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts, /**< can be NULL for defaults */
-	git_tree *old,
-	git_tree *new,
+	git_tree *old_tree,
+	git_tree *new_tree,
 	git_diff_list **diff);
 
 /**
@@ -225,13 +225,13 @@ GIT_EXTERN(int) git_diff_tree_to_tree(
  *
  * @param repo The repository containing the tree and index.
  * @param opts Structure with options to influence diff or NULL for defaults.
- * @param old A git_tree object to diff from.
+ * @param old_tree A git_tree object to diff from.
  * @param diff A pointer to a git_diff_list pointer that will be allocated.
  */
 GIT_EXTERN(int) git_diff_index_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts, /**< can be NULL for defaults */
-	git_tree *old,
+	git_tree *old_tree,
 	git_diff_list **diff);
 
 /**
@@ -260,13 +260,13 @@ GIT_EXTERN(int) git_diff_workdir_to_index(
  *
  * @param repo The repository containing the tree.
  * @param opts Structure with options to influence diff or NULL for defaults.
- * @param old A git_tree object to diff from.
+ * @param old_tree A git_tree object to diff from.
  * @param diff A pointer to a git_diff_list pointer that will be allocated.
  */
 GIT_EXTERN(int) git_diff_workdir_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts, /**< can be NULL for defaults */
-	git_tree *old,
+	git_tree *old_tree,
 	git_diff_list **diff);
 
 /**
@@ -341,8 +341,8 @@ GIT_EXTERN(int) git_diff_print_patch(
  */
 GIT_EXTERN(int) git_diff_blobs(
 	git_repository *repo,
-	git_blob *old,
-	git_blob *new,
+	git_blob *old_blob,
+	git_blob *new_blob,
 	git_diff_options *options,
 	void *cb_data,
 	git_diff_hunk_fn hunk_cb,
diff --git a/src/diff.c b/src/diff.c
index a0fd5fdf1..db339d74e 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -14,14 +14,14 @@ static void diff_delta__free(git_diff_delta *delta)
 	if (!delta)
 		return;
 
-	if (delta->new.flags & GIT_DIFF_FILE_FREE_PATH) {
-		git__free((char *)delta->new.path);
-		delta->new.path = NULL;
+	if (delta->new_file.flags & GIT_DIFF_FILE_FREE_PATH) {
+		git__free((char *)delta->new_file.path);
+		delta->new_file.path = NULL;
 	}
 
-	if (delta->old.flags & GIT_DIFF_FILE_FREE_PATH) {
-		git__free((char *)delta->old.path);
-		delta->old.path = NULL;
+	if (delta->old_file.flags & GIT_DIFF_FILE_FREE_PATH) {
+		git__free((char *)delta->old_file.path);
+		delta->old_file.path = NULL;
 	}
 
 	git__free(delta);
@@ -36,13 +36,13 @@ static git_diff_delta *diff_delta__alloc(
 	if (!delta)
 		return NULL;
 
-	delta->old.path = git__strdup(path);
-	if (delta->old.path == NULL) {
+	delta->old_file.path = git__strdup(path);
+	if (delta->old_file.path == NULL) {
 		git__free(delta);
 		return NULL;
 	}
-	delta->old.flags |= GIT_DIFF_FILE_FREE_PATH;
-	delta->new.path = delta->old.path;
+	delta->old_file.flags |= GIT_DIFF_FILE_FREE_PATH;
+	delta->new_file.path = delta->old_file.path;
 
 	if (diff->opts.flags & GIT_DIFF_REVERSE) {
 		switch (status) {
@@ -64,24 +64,24 @@ static git_diff_delta *diff_delta__dup(const git_diff_delta *d)
 
 	memcpy(delta, d, sizeof(git_diff_delta));
 
-	delta->old.path = git__strdup(d->old.path);
-	if (delta->old.path == NULL) {
+	delta->old_file.path = git__strdup(d->old_file.path);
+	if (delta->old_file.path == NULL) {
 		git__free(delta);
 		return NULL;
 	}
-	delta->old.flags |= GIT_DIFF_FILE_FREE_PATH;
+	delta->old_file.flags |= GIT_DIFF_FILE_FREE_PATH;
 
-	if (d->new.path != d->old.path) {
-		delta->new.path = git__strdup(d->new.path);
-		if (delta->new.path == NULL) {
-			git__free(delta->old.path);
+	if (d->new_file.path != d->old_file.path) {
+		delta->new_file.path = git__strdup(d->new_file.path);
+		if (delta->new_file.path == NULL) {
+			git__free(delta->old_file.path);
 			git__free(delta);
 			return NULL;
 		}
-		delta->new.flags |= GIT_DIFF_FILE_FREE_PATH;
+		delta->new_file.flags |= GIT_DIFF_FILE_FREE_PATH;
 	} else {
-		delta->new.path = delta->old.path;
-		delta->new.flags &= ~GIT_DIFF_FILE_FREE_PATH;
+		delta->new_file.path = delta->old_file.path;
+		delta->new_file.flags &= ~GIT_DIFF_FILE_FREE_PATH;
 	}
 
 	return delta;
@@ -94,16 +94,16 @@ static git_diff_delta *diff_delta__merge_like_cgit(
 	if (!dup)
 		return NULL;
 
-	if (git_oid_cmp(&dup->new.oid, &b->new.oid) == 0)
+	if (git_oid_cmp(&dup->new_file.oid, &b->new_file.oid) == 0)
 		return dup;
 
-	git_oid_cpy(&dup->new.oid, &b->new.oid);
+	git_oid_cpy(&dup->new_file.oid, &b->new_file.oid);
 
-	dup->new.mode = b->new.mode;
-	dup->new.size = b->new.size;
-	dup->new.flags =
-		(dup->new.flags & GIT_DIFF_FILE_FREE_PATH) |
-		(b->new.flags & ~GIT_DIFF_FILE_FREE_PATH);
+	dup->new_file.mode = b->new_file.mode;
+	dup->new_file.size = b->new_file.size;
+	dup->new_file.flags =
+		(dup->new_file.flags & GIT_DIFF_FILE_FREE_PATH) |
+		(b->new_file.flags & ~GIT_DIFF_FILE_FREE_PATH);
 
 	/* Emulate C git for merging two diffs (a la 'git diff <sha>').
 	 *
@@ -111,7 +111,7 @@ static git_diff_delta *diff_delta__merge_like_cgit(
 	 * diffs with the index but uses the workdir contents.  This emulates
 	 * those choices so we can emulate the type of diff.
 	 */
-	if (git_oid_cmp(&dup->old.oid, &dup->new.oid) == 0) {
+	if (git_oid_cmp(&dup->old_file.oid, &dup->new_file.oid) == 0) {
 		if (dup->status == GIT_DELTA_DELETED)
 			/* preserve pending delete info */;
 		else if (b->status == GIT_DELTA_UNTRACKED ||
@@ -141,17 +141,17 @@ static int diff_delta__from_one(
 	assert(status != GIT_DELTA_MODIFIED);
 
 	if (delta->status == GIT_DELTA_DELETED) {
-		delta->old.mode = entry->mode;
-		delta->old.size = entry->file_size;
-		git_oid_cpy(&delta->old.oid, &entry->oid);
+		delta->old_file.mode = entry->mode;
+		delta->old_file.size = entry->file_size;
+		git_oid_cpy(&delta->old_file.oid, &entry->oid);
 	} else /* ADDED, IGNORED, UNTRACKED */ {
-		delta->new.mode = entry->mode;
-		delta->new.size = entry->file_size;
-		git_oid_cpy(&delta->new.oid, &entry->oid);
+		delta->new_file.mode = entry->mode;
+		delta->new_file.size = entry->file_size;
+		git_oid_cpy(&delta->new_file.oid, &entry->oid);
 	}
 
-	delta->old.flags |= GIT_DIFF_FILE_VALID_OID;
-	delta->new.flags |= GIT_DIFF_FILE_VALID_OID;
+	delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
+	delta->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
 
 	if ((error = git_vector_insert(&diff->deltas, delta)) < GIT_SUCCESS)
 		diff_delta__free(delta);
@@ -162,31 +162,31 @@ static int diff_delta__from_one(
 static int diff_delta__from_two(
 	git_diff_list *diff,
 	git_delta_t   status,
-	const git_index_entry *old,
-	const git_index_entry *new,
+	const git_index_entry *old_entry,
+	const git_index_entry *new_entry,
 	git_oid *new_oid)
 {
 	int error;
 	git_diff_delta *delta;
 
 	if ((diff->opts.flags & GIT_DIFF_REVERSE) != 0) {
-		const git_index_entry *temp = old;
-		old = new;
-		new = temp;
+		const git_index_entry *temp = old_entry;
+		old_entry = new_entry;
+		new_entry = temp;
 	}
 
-	delta = diff_delta__alloc(diff, status, old->path);
+	delta = diff_delta__alloc(diff, status, old_entry->path);
 	if (!delta)
 		return git__rethrow(GIT_ENOMEM, "Could not allocate diff record");
 
-	delta->old.mode = old->mode;
-	git_oid_cpy(&delta->old.oid, &old->oid);
-	delta->old.flags |= GIT_DIFF_FILE_VALID_OID;
+	delta->old_file.mode = old_entry->mode;
+	git_oid_cpy(&delta->old_file.oid, &old_entry->oid);
+	delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
 
-	delta->new.mode = new->mode;
-	git_oid_cpy(&delta->new.oid, new_oid ? new_oid : &new->oid);
-	if (new_oid || !git_oid_iszero(&new->oid))
-		delta->new.flags |= GIT_DIFF_FILE_VALID_OID;
+	delta->new_file.mode = new_entry->mode;
+	git_oid_cpy(&delta->new_file.oid, new_oid ? new_oid : &new_entry->oid);
+	if (new_oid || !git_oid_iszero(&new_entry->oid))
+		delta->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
 
 	if ((error = git_vector_insert(&diff->deltas, delta)) < GIT_SUCCESS)
 		diff_delta__free(delta);
@@ -194,8 +194,8 @@ static int diff_delta__from_two(
 	return error;
 }
 
-#define DIFF_SRC_PREFIX_DEFAULT "a/"
-#define DIFF_DST_PREFIX_DEFAULT "b/"
+#define DIFF_OLD_PREFIX_DEFAULT "a/"
+#define DIFF_NEW_PREFIX_DEFAULT "b/"
 
 static char *diff_strdup_prefix(const char *prefix)
 {
@@ -215,7 +215,7 @@ static char *diff_strdup_prefix(const char *prefix)
 static int diff_delta__cmp(const void *a, const void *b)
 {
 	const git_diff_delta *da = a, *db = b;
-	int val = strcmp(da->old.path, db->old.path);
+	int val = strcmp(da->old_file.path, db->old_file.path);
 	return val ? val : ((int)da->status - (int)db->status);
 }
 
@@ -233,25 +233,25 @@ static git_diff_list *git_diff_list_alloc(
 
 	memcpy(&diff->opts, opts, sizeof(git_diff_options));
 
-	diff->opts.src_prefix = diff_strdup_prefix(
-		opts->src_prefix ? opts->src_prefix : DIFF_SRC_PREFIX_DEFAULT);
-	diff->opts.dst_prefix = diff_strdup_prefix(
-		opts->dst_prefix ? opts->dst_prefix : DIFF_DST_PREFIX_DEFAULT);
+	diff->opts.old_prefix = diff_strdup_prefix(
+		opts->old_prefix ? opts->old_prefix : DIFF_OLD_PREFIX_DEFAULT);
+	diff->opts.new_prefix = diff_strdup_prefix(
+		opts->new_prefix ? opts->new_prefix : DIFF_NEW_PREFIX_DEFAULT);
 
-	if (!diff->opts.src_prefix || !diff->opts.dst_prefix) {
+	if (!diff->opts.old_prefix || !diff->opts.new_prefix) {
 		git__free(diff);
 		return NULL;
 	}
 
 	if (diff->opts.flags & GIT_DIFF_REVERSE) {
-		char *swap = diff->opts.src_prefix;
-		diff->opts.src_prefix = diff->opts.dst_prefix;
-		diff->opts.dst_prefix = swap;
+		char *swap = diff->opts.old_prefix;
+		diff->opts.old_prefix = diff->opts.new_prefix;
+		diff->opts.new_prefix = swap;
 	}
 
 	if (git_vector_init(&diff->deltas, 0, diff_delta__cmp) < GIT_SUCCESS) {
-		git__free(diff->opts.src_prefix);
-		git__free(diff->opts.dst_prefix);
+		git__free(diff->opts.old_prefix);
+		git__free(diff->opts.new_prefix);
 		git__free(diff);
 		return NULL;
 	}
@@ -274,8 +274,8 @@ void git_diff_list_free(git_diff_list *diff)
 		diff->deltas.contents[i] = NULL;
 	}
 	git_vector_free(&diff->deltas);
-	git__free(diff->opts.src_prefix);
-	git__free(diff->opts.dst_prefix);
+	git__free(diff->opts.old_prefix);
+	git__free(diff->opts.new_prefix);
 	git__free(diff);
 }
 
@@ -316,16 +316,16 @@ static int oid_for_workdir_item(
 }
 
 static int maybe_modified(
-	git_iterator *old,
+	git_iterator *old_iter,
 	const git_index_entry *oitem,
-	git_iterator *new,
+	git_iterator *new_iter,
 	const git_index_entry *nitem,
 	git_diff_list *diff)
 {
 	int error = GIT_SUCCESS;
 	git_oid noid, *use_noid = NULL;
 
-	GIT_UNUSED(old);
+	GIT_UNUSED(old_iter);
 
 	/* support "assume unchanged" & "skip worktree" bits */
 	if ((oitem->flags_extended & GIT_IDXENTRY_INTENT_TO_ADD) != 0 ||
@@ -343,7 +343,7 @@ static int maybe_modified(
 		oitem->mode == nitem->mode)
 		return GIT_SUCCESS;
 
-	if (git_oid_iszero(&nitem->oid) && new->type == GIT_ITERATOR_WORKDIR) {
+	if (git_oid_iszero(&nitem->oid) && new_iter->type == GIT_ITERATOR_WORKDIR) {
 		/* if they files look exactly alike, then we'll assume the same */
 		if (oitem->file_size == nitem->file_size &&
 			oitem->ctime.seconds == nitem->ctime.seconds &&
@@ -376,8 +376,8 @@ static int maybe_modified(
 static int diff_from_iterators(
 	git_repository *repo,
 	const git_diff_options *opts, /**< can be NULL for defaults */
-	git_iterator *old,
-	git_iterator *new,
+	git_iterator *old_iter,
+	git_iterator *new_iter,
 	git_diff_list **diff_ptr)
 {
 	int error;
@@ -389,11 +389,11 @@ static int diff_from_iterators(
 		goto cleanup;
 	}
 
-	diff->old_src = old->type;
-	diff->new_src = new->type;
+	diff->old_src = old_iter->type;
+	diff->new_src = new_iter->type;
 
-	if ((error = git_iterator_current(old, &oitem)) < GIT_SUCCESS ||
-		(error = git_iterator_current(new, &nitem)) < GIT_SUCCESS)
+	if ((error = git_iterator_current(old_iter, &oitem)) < GIT_SUCCESS ||
+		(error = git_iterator_current(new_iter, &nitem)) < GIT_SUCCESS)
 		goto cleanup;
 
 	/* run iterators building diffs */
@@ -403,7 +403,7 @@ static int diff_from_iterators(
 		if (oitem && (!nitem || strcmp(oitem->path, nitem->path) < 0)) {
 			error = diff_delta__from_one(diff, GIT_DELTA_DELETED, oitem);
 			if (error == GIT_SUCCESS)
-				error = git_iterator_advance(old, &oitem);
+				error = git_iterator_advance(old_iter, &oitem);
 			continue;
 		}
 
@@ -418,29 +418,29 @@ static int diff_from_iterators(
 			if (ignore_prefix != NULL &&
 				git__prefixcmp(nitem->path, ignore_prefix) == 0)
 			{
-				error = git_iterator_advance(new, &nitem);
+				error = git_iterator_advance(new_iter, &nitem);
 				continue;
 			}
 
-			is_ignored = git_iterator_current_is_ignored(new);
+			is_ignored = git_iterator_current_is_ignored(new_iter);
 
 			if (S_ISDIR(nitem->mode)) {
 				if (git__prefixcmp(oitem->path, nitem->path) == 0) {
 					if (is_ignored)
 						ignore_prefix = nitem->path;
-					error = git_iterator_advance_into_directory(new, &nitem);
+					error = git_iterator_advance_into_directory(new_iter, &nitem);
 					continue;
 				}
 				delta_type = GIT_DELTA_UNTRACKED;
 			}
 			else if (is_ignored)
 				delta_type = GIT_DELTA_IGNORED;
-			else if (new->type == GIT_ITERATOR_WORKDIR)
+			else if (new_iter->type == GIT_ITERATOR_WORKDIR)
 				delta_type = GIT_DELTA_UNTRACKED;
 
 			error = diff_delta__from_one(diff, delta_type, nitem);
 			if (error == GIT_SUCCESS)
-				error = git_iterator_advance(new, &nitem);
+				error = git_iterator_advance(new_iter, &nitem);
 			continue;
 		}
 
@@ -449,16 +449,16 @@ static int diff_from_iterators(
 		 */
 		assert(oitem && nitem && strcmp(oitem->path, nitem->path) == 0);
 
-		error = maybe_modified(old, oitem, new, nitem, diff);
+		error = maybe_modified(old_iter, oitem, new_iter, nitem, diff);
 		if (error == GIT_SUCCESS)
-			error = git_iterator_advance(old, &oitem);
+			error = git_iterator_advance(old_iter, &oitem);
 		if (error == GIT_SUCCESS)
-			error = git_iterator_advance(new, &nitem);
+			error = git_iterator_advance(new_iter, &nitem);
 	}
 
 cleanup:
-	git_iterator_free(old);
-	git_iterator_free(new);
+	git_iterator_free(old_iter);
+	git_iterator_free(new_iter);
 
 	if (error != GIT_SUCCESS) {
 		git_diff_list_free(diff);
@@ -474,17 +474,17 @@ cleanup:
 int git_diff_tree_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts, /**< can be NULL for defaults */
-	git_tree *old,
-	git_tree *new,
+	git_tree *old_tree,
+	git_tree *new_tree,
 	git_diff_list **diff)
 {
 	int error;
 	git_iterator *a = NULL, *b = NULL;
 
-	assert(repo && old && new && diff);
+	assert(repo && old_tree && new_tree && diff);
 
-	if ((error = git_iterator_for_tree(repo, old, &a)) < GIT_SUCCESS ||
-		(error = git_iterator_for_tree(repo, new, &b)) < GIT_SUCCESS)
+	if ((error = git_iterator_for_tree(repo, old_tree, &a)) < GIT_SUCCESS ||
+		(error = git_iterator_for_tree(repo, new_tree, &b)) < GIT_SUCCESS)
 		return error;
 
 	return diff_from_iterators(repo, opts, a, b, diff);
@@ -493,15 +493,15 @@ int git_diff_tree_to_tree(
 int git_diff_index_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts,
-	git_tree *old,
+	git_tree *old_tree,
 	git_diff_list **diff)
 {
 	int error;
 	git_iterator *a = NULL, *b = NULL;
 
-	assert(repo && old && diff);
+	assert(repo && old_tree && diff);
 
-	if ((error = git_iterator_for_tree(repo, old, &a)) < GIT_SUCCESS ||
+	if ((error = git_iterator_for_tree(repo, old_tree, &a)) < GIT_SUCCESS ||
 		(error = git_iterator_for_index(repo, &b)) < GIT_SUCCESS)
 		return error;
 
@@ -529,15 +529,15 @@ int git_diff_workdir_to_index(
 int git_diff_workdir_to_tree(
 	git_repository *repo,
 	const git_diff_options *opts,
-	git_tree *old,
+	git_tree *old_tree,
 	git_diff_list **diff)
 {
 	int error;
 	git_iterator *a = NULL, *b = NULL;
 
-	assert(repo && old && diff);
+	assert(repo && old_tree && diff);
 
-	if ((error = git_iterator_for_tree(repo, old, &a)) < GIT_SUCCESS ||
+	if ((error = git_iterator_for_tree(repo, old_tree, &a)) < GIT_SUCCESS ||
 		(error = git_iterator_for_workdir(repo, &b)) < GIT_SUCCESS)
 		return error;
 
@@ -560,8 +560,10 @@ int git_diff_merge(
 	while (i < onto->deltas.length || j < from->deltas.length) {
 		git_diff_delta       *o = git_vector_get(&onto->deltas, i);
 		const git_diff_delta *f = git_vector_get_const(&from->deltas, j);
-		const char *opath = !o ? NULL : o->old.path ? o->old.path : o->new.path;
-		const char *fpath = !f ? NULL : f->old.path ? f->old.path : f->new.path;
+		const char *opath =
+			!o ? NULL : o->old_file.path ? o->old_file.path : o->new_file.path;
+		const char *fpath =
+			!f ? NULL : f->old_file.path ? f->old_file.path : f->new_file.path;
 
 		if (opath && (!fpath || strcmp(opath, fpath) < 0)) {
 			delta = diff_delta__dup(o);
diff --git a/src/diff_output.c b/src/diff_output.c
index 5e7486ab8..aea79ba6c 100644
--- a/src/diff_output.c
+++ b/src/diff_output.c
@@ -103,11 +103,11 @@ static int set_file_is_binary_by_attr(git_repository *repo, git_diff_file *file)
 
 static void set_delta_is_binary(git_diff_delta *delta)
 {
-	if ((delta->old.flags & GIT_DIFF_FILE_BINARY) != 0 ||
-		(delta->new.flags & GIT_DIFF_FILE_BINARY) != 0)
+	if ((delta->old_file.flags & GIT_DIFF_FILE_BINARY) != 0 ||
+		(delta->new_file.flags & GIT_DIFF_FILE_BINARY) != 0)
 		delta->binary = 1;
-	else if ((delta->old.flags & GIT_DIFF_FILE_NOT_BINARY) != 0 ||
-			 (delta->new.flags & GIT_DIFF_FILE_NOT_BINARY) != 0)
+	else if ((delta->old_file.flags & GIT_DIFF_FILE_NOT_BINARY) != 0 ||
+			 (delta->new_file.flags & GIT_DIFF_FILE_NOT_BINARY) != 0)
 		delta->binary = 0;
 	/* otherwise leave delta->binary value untouched */
 }
@@ -121,34 +121,34 @@ static int file_is_binary_by_attr(
 	delta->binary = -1;
 
 	/* make sure files are conceivably mmap-able */
-	if ((git_off_t)((size_t)delta->old.size) != delta->old.size ||
-		(git_off_t)((size_t)delta->new.size) != delta->new.size)
+	if ((git_off_t)((size_t)delta->old_file.size) != delta->old_file.size ||
+		(git_off_t)((size_t)delta->new_file.size) != delta->new_file.size)
 	{
-		delta->old.flags |= GIT_DIFF_FILE_BINARY;
-		delta->new.flags |= GIT_DIFF_FILE_BINARY;
+		delta->old_file.flags |= GIT_DIFF_FILE_BINARY;
+		delta->new_file.flags |= GIT_DIFF_FILE_BINARY;
 		delta->binary = 1;
 		return GIT_SUCCESS;
 	}
 
 	/* check if user is forcing us to text diff these files */
 	if (diff->opts.flags & GIT_DIFF_FORCE_TEXT) {
-		delta->old.flags |= GIT_DIFF_FILE_NOT_BINARY;
-		delta->new.flags |= GIT_DIFF_FILE_NOT_BINARY;
+		delta->old_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
+		delta->new_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
 		delta->binary = 0;
 		return GIT_SUCCESS;
 	}
 
 	/* check diff attribute +, -, or 0 */
-	error = set_file_is_binary_by_attr(diff->repo, &delta->old);
+	error = set_file_is_binary_by_attr(diff->repo, &delta->old_file);
 	if (error != GIT_SUCCESS)
 		return error;
 
-	mirror_new = (delta->new.path == delta->old.path ||
-				  strcmp(delta->new.path, delta->old.path) == 0);
+	mirror_new = (delta->new_file.path == delta->old_file.path ||
+				  strcmp(delta->new_file.path, delta->old_file.path) == 0);
 	if (mirror_new)
-		delta->new.flags &= (delta->old.flags & BINARY_DIFF_FLAGS);
+		delta->new_file.flags &= (delta->old_file.flags & BINARY_DIFF_FLAGS);
 	else
-		error = set_file_is_binary_by_attr(diff->repo, &delta->new);
+		error = set_file_is_binary_by_attr(diff->repo, &delta->new_file);
 
 	set_delta_is_binary(delta);
 
@@ -163,20 +163,20 @@ static int file_is_binary_by_content(
 {
 	GIT_UNUSED(diff);
 
-	if ((delta->old.flags & BINARY_DIFF_FLAGS) == 0) {
+	if ((delta->old_file.flags & BINARY_DIFF_FLAGS) == 0) {
 		size_t search_len = min(old_data->len, 4000);
 		if (strnlen(old_data->data, search_len) != search_len)
-			delta->old.flags |= GIT_DIFF_FILE_BINARY;
+			delta->old_file.flags |= GIT_DIFF_FILE_BINARY;
 		else
-			delta->old.flags |= GIT_DIFF_FILE_NOT_BINARY;
+			delta->old_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
 	}
 
-	if ((delta->new.flags & BINARY_DIFF_FLAGS) == 0) {
+	if ((delta->new_file.flags & BINARY_DIFF_FLAGS) == 0) {
 		size_t search_len = min(new_data->len, 4000);
 		if (strnlen(new_data->data, search_len) != search_len)
-			delta->new.flags |= GIT_DIFF_FILE_BINARY;
+			delta->new_file.flags |= GIT_DIFF_FILE_BINARY;
 		else
-			delta->new.flags |= GIT_DIFF_FILE_NOT_BINARY;
+			delta->new_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
 	}
 
 	set_delta_is_binary(delta);
@@ -341,37 +341,37 @@ int git_diff_foreach(
 			 delta->status == GIT_DELTA_MODIFIED))
 		{
 			if (diff->old_src == GIT_ITERATOR_WORKDIR)
-				error = get_workdir_content(diff->repo, &delta->old, &old_data);
+				error = get_workdir_content(diff->repo, &delta->old_file, &old_data);
 			else
 				error = get_blob_content(
-					diff->repo, &delta->old.oid, &old_data, &old_blob);
+					diff->repo, &delta->old_file.oid, &old_data, &old_blob);
 			if (error != GIT_SUCCESS)
 				goto cleanup;
 		}
 
 		if (delta->binary != 1 &&
-			(hunk_cb || line_cb || git_oid_iszero(&delta->new.oid)) &&
+			(hunk_cb || line_cb || git_oid_iszero(&delta->new_file.oid)) &&
 			(delta->status == GIT_DELTA_ADDED ||
 			 delta->status == GIT_DELTA_MODIFIED))
 		{
 			if (diff->new_src == GIT_ITERATOR_WORKDIR)
-				error = get_workdir_content(diff->repo, &delta->new, &new_data);
+				error = get_workdir_content(diff->repo, &delta->new_file, &new_data);
 			else
 				error = get_blob_content(
-					diff->repo, &delta->new.oid, &new_data, &new_blob);
+					diff->repo, &delta->new_file.oid, &new_data, &new_blob);
 			if (error != GIT_SUCCESS)
 				goto cleanup;
 
-			if ((delta->new.flags | GIT_DIFF_FILE_VALID_OID) == 0) {
+			if ((delta->new_file.flags | GIT_DIFF_FILE_VALID_OID) == 0) {
 				error = git_odb_hash(
-					&delta->new.oid, new_data.data, new_data.len, GIT_OBJ_BLOB);
+					&delta->new_file.oid, new_data.data, new_data.len, GIT_OBJ_BLOB);
 				if (error != GIT_SUCCESS)
 					goto cleanup;
 
 				/* since we did not have the definitive oid, we may have
 				 * incorrect status and need to skip this item.
 				 */
-				if (git_oid_cmp(&delta->old.oid, &delta->new.oid) == 0) {
+				if (git_oid_cmp(&delta->old_file.oid, &delta->new_file.oid) == 0) {
 					delta->status = GIT_DELTA_UNMODIFIED;
 					goto cleanup;
 				}
@@ -414,8 +414,8 @@ int git_diff_foreach(
 			&xdiff_params, &xdiff_config, &xdiff_callback);
 
 cleanup:
-		release_content(&delta->old, &old_data, old_blob);
-		release_content(&delta->new, &new_data, new_blob);
+		release_content(&delta->old_file, &old_data, old_blob);
+		release_content(&delta->new_file, &new_data, new_blob);
 
 		if (error != GIT_SUCCESS)
 			break;
@@ -464,23 +464,23 @@ static int print_compact(void *data, git_diff_delta *delta, float progress)
 	if (!code)
 		return GIT_SUCCESS;
 
-	old_suffix = pick_suffix(delta->old.mode);
-	new_suffix = pick_suffix(delta->new.mode);
+	old_suffix = pick_suffix(delta->old_file.mode);
+	new_suffix = pick_suffix(delta->new_file.mode);
 
 	git_buf_clear(pi->buf);
 
-	if (delta->old.path != delta->new.path &&
-		strcmp(delta->old.path,delta->new.path) != 0)
+	if (delta->old_file.path != delta->new_file.path &&
+		strcmp(delta->old_file.path,delta->new_file.path) != 0)
 		git_buf_printf(pi->buf, "%c\t%s%c -> %s%c\n", code,
-			delta->old.path, old_suffix, delta->new.path, new_suffix);
-	else if (delta->old.mode != delta->new.mode &&
-		delta->old.mode != 0 && delta->new.mode != 0)
+			delta->old_file.path, old_suffix, delta->new_file.path, new_suffix);
+	else if (delta->old_file.mode != delta->new_file.mode &&
+		delta->old_file.mode != 0 && delta->new_file.mode != 0)
 		git_buf_printf(pi->buf, "%c\t%s%c (%o -> %o)\n", code,
-			delta->old.path, new_suffix, delta->old.mode, delta->new.mode);
+			delta->old_file.path, new_suffix, delta->old_file.mode, delta->new_file.mode);
 	else if (old_suffix != ' ')
-		git_buf_printf(pi->buf, "%c\t%s%c\n", code, delta->old.path, old_suffix);
+		git_buf_printf(pi->buf, "%c\t%s%c\n", code, delta->old_file.path, old_suffix);
 	else
-		git_buf_printf(pi->buf, "%c\t%s\n", code, delta->old.path);
+		git_buf_printf(pi->buf, "%c\t%s\n", code, delta->old_file.path);
 
 	if (git_buf_lasterror(pi->buf) != GIT_SUCCESS)
 		return git_buf_lasterror(pi->buf);
@@ -515,21 +515,21 @@ static int print_oid_range(diff_print_info *pi, git_diff_delta *delta)
 	char start_oid[8], end_oid[8];
 
 	/* TODO: Determine a good actual OID range to print */
-	git_oid_to_string(start_oid, sizeof(start_oid), &delta->old.oid);
-	git_oid_to_string(end_oid, sizeof(end_oid), &delta->new.oid);
+	git_oid_to_string(start_oid, sizeof(start_oid), &delta->old_file.oid);
+	git_oid_to_string(end_oid, sizeof(end_oid), &delta->new_file.oid);
 
 	/* TODO: Match git diff more closely */
-	if (delta->old.mode == delta->new.mode) {
+	if (delta->old_file.mode == delta->new_file.mode) {
 		git_buf_printf(pi->buf, "index %s..%s %o\n",
-			start_oid, end_oid, delta->old.mode);
+			start_oid, end_oid, delta->old_file.mode);
 	} else {
-		if (delta->old.mode == 0) {
-			git_buf_printf(pi->buf, "new file mode %o\n", delta->new.mode);
-		} else if (delta->new.mode == 0) {
-			git_buf_printf(pi->buf, "deleted file mode %o\n", delta->old.mode);
+		if (delta->old_file.mode == 0) {
+			git_buf_printf(pi->buf, "new file mode %o\n", delta->new_file.mode);
+		} else if (delta->new_file.mode == 0) {
+			git_buf_printf(pi->buf, "deleted file mode %o\n", delta->old_file.mode);
 		} else {
-			git_buf_printf(pi->buf, "old mode %o\n", delta->old.mode);
-			git_buf_printf(pi->buf, "new mode %o\n", delta->new.mode);
+			git_buf_printf(pi->buf, "old mode %o\n", delta->old_file.mode);
+			git_buf_printf(pi->buf, "new mode %o\n", delta->new_file.mode);
 		}
 		git_buf_printf(pi->buf, "index %s..%s\n", start_oid, end_oid);
 	}
@@ -541,23 +541,23 @@ static int print_patch_file(void *data, git_diff_delta *delta, float progress)
 {
 	int error;
 	diff_print_info *pi = data;
-	const char *oldpfx = pi->diff->opts.src_prefix;
-	const char *oldpath = delta->old.path;
-	const char *newpfx = pi->diff->opts.dst_prefix;
-	const char *newpath = delta->new.path;
+	const char *oldpfx = pi->diff->opts.old_prefix;
+	const char *oldpath = delta->old_file.path;
+	const char *newpfx = pi->diff->opts.new_prefix;
+	const char *newpath = delta->new_file.path;
 
 	GIT_UNUSED(progress);
 
 	git_buf_clear(pi->buf);
-	git_buf_printf(pi->buf, "diff --git %s%s %s%s\n", oldpfx, delta->old.path, newpfx, delta->new.path);
+	git_buf_printf(pi->buf, "diff --git %s%s %s%s\n", oldpfx, delta->old_file.path, newpfx, delta->new_file.path);
 	if ((error = print_oid_range(pi, delta)) < GIT_SUCCESS)
 		return error;
 
-	if (git_oid_iszero(&delta->old.oid)) {
+	if (git_oid_iszero(&delta->old_file.oid)) {
 		oldpfx = "";
 		oldpath = "/dev/null";
 	}
-	if (git_oid_iszero(&delta->new.oid)) {
+	if (git_oid_iszero(&delta->new_file.oid)) {
 		oldpfx = "";
 		oldpath = "/dev/null";
 	}
@@ -664,7 +664,7 @@ int git_diff_blobs(
 {
 	diff_output_info info;
 	git_diff_delta delta;
-	mmfile_t old, new;
+	mmfile_t old_data, new_data;
 	xpparam_t xdiff_params;
 	xdemitconf_t xdiff_config;
 	xdemitcb_t xdiff_callback;
@@ -678,31 +678,31 @@ int git_diff_blobs(
 	}
 
 	if (old_blob) {
-		old.ptr  = (char *)git_blob_rawcontent(old_blob);
-		old.size = git_blob_rawsize(old_blob);
+		old_data.ptr  = (char *)git_blob_rawcontent(old_blob);
+		old_data.size = git_blob_rawsize(old_blob);
 	} else {
-		old.ptr  = "";
-		old.size = 0;
+		old_data.ptr  = "";
+		old_data.size = 0;
 	}
 
 	if (new_blob) {
-		new.ptr  = (char *)git_blob_rawcontent(new_blob);
-		new.size = git_blob_rawsize(new_blob);
+		new_data.ptr  = (char *)git_blob_rawcontent(new_blob);
+		new_data.size = git_blob_rawsize(new_blob);
 	} else {
-		new.ptr  = "";
-		new.size = 0;
+		new_data.ptr  = "";
+		new_data.size = 0;
 	}
 
 	/* populate a "fake" delta record */
-	delta.status = old.ptr ?
-		(new.ptr ? GIT_DELTA_MODIFIED : GIT_DELTA_DELETED) :
-		(new.ptr ? GIT_DELTA_ADDED : GIT_DELTA_UNTRACKED);
-	delta.old.mode = 0100644; /* can't know the truth from a blob alone */
-	delta.new.mode = 0100644;
-	git_oid_cpy(&delta.old.oid, git_object_id((const git_object *)old_blob));
-	git_oid_cpy(&delta.new.oid, git_object_id((const git_object *)new_blob));
-	delta.old.path = NULL;
-	delta.new.path = NULL;
+	delta.status = old_data.ptr ?
+		(new_data.ptr ? GIT_DELTA_MODIFIED : GIT_DELTA_DELETED) :
+		(new_data.ptr ? GIT_DELTA_ADDED : GIT_DELTA_UNTRACKED);
+	delta.old_file.mode = 0100644; /* can't know the truth from a blob alone */
+	delta.new_file.mode = 0100644;
+	git_oid_cpy(&delta.old_file.oid, git_object_id((const git_object *)old_blob));
+	git_oid_cpy(&delta.new_file.oid, git_object_id((const git_object *)new_blob));
+	delta.old_file.path = NULL;
+	delta.new_file.path = NULL;
 	delta.similarity = 0;
 
 	info.diff    = NULL;
@@ -716,7 +716,7 @@ int git_diff_blobs(
 	xdiff_callback.outf = diff_output_cb;
 	xdiff_callback.priv = &info;
 
-	xdl_diff(&old, &new, &xdiff_params, &xdiff_config, &xdiff_callback);
+	xdl_diff(&old_data, &new_data, &xdiff_params, &xdiff_config, &xdiff_callback);
 
 	return GIT_SUCCESS;
 }