tree-wide: mark local functions as static

We've accumulated quite some functions which are never used outside of
their respective code unit, but which are lacking the `static` keyword.
Add it to reduce their linkage scope and allow the compiler to optimize
better.

src/checkout.c

@@ -806,7 +806,7 @@ static int checkout_conflictdata_cmp(const void *a, const void *b)
 	return diff;
 }
 
-int checkout_conflictdata_empty(
+static int checkout_conflictdata_empty(
 	const git_vector *conflicts, size_t idx, void *payload)
 {
 	checkout_conflictdata *conflict;

src/config.c

@@ -1000,7 +1000,7 @@ static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_it
 	return error;
 }
 
-void multivar_iter_free(git_config_iterator *_iter)
+static void multivar_iter_free(git_config_iterator *_iter)
 {
 	multivar_iter *iter = (multivar_iter *) _iter;
 

src/diff.c

@@ -150,7 +150,7 @@ int git_diff_foreach(
 	return error;
 }
 
-int git_diff_format_email__append_header_tobuf(
+static int diff_format_email_append_header_tobuf(
 	git_buf *out,
 	const git_oid *id,
 	const git_signature *author,
@@ -207,7 +207,7 @@ int git_diff_format_email__append_header_tobuf(
 	return error;
 }
 
-int git_diff_format_email__append_patches_tobuf(
+static int diff_format_email_append_patches_tobuf(
 	git_buf *out,
 	git_diff *diff)
 {
@@ -287,7 +287,7 @@ int git_diff_format_email(
 		strncpy(summary, opts->summary, offset);
 	}
 
-	error = git_diff_format_email__append_header_tobuf(out,
+	error = diff_format_email_append_header_tobuf(out,
 		opts->id, opts->author, summary == NULL ? opts->summary : summary,
 		opts->body, opts->patch_no, opts->total_patches, ignore_marker);
 
@@ -300,7 +300,7 @@ int git_diff_format_email(
 		(error = git_diff_get_stats(&stats, diff)) < 0 ||
 		(error = git_diff_stats_to_buf(out, stats, format_flags, 0)) < 0 ||
 		(error = git_buf_putc(out, '\n')) < 0 ||
-		(error = git_diff_format_email__append_patches_tobuf(out, diff)) < 0)
+		(error = diff_format_email_append_patches_tobuf(out, diff)) < 0)
 			goto on_error;
 
 	error = git_buf_puts(out, "--\nlibgit2 " LIBGIT2_VERSION "\n\n");
@@ -421,7 +421,7 @@ static void strip_spaces(git_buf *buf)
 	git_buf_truncate(buf, len);
 }
 
-int git_diff_patchid_print_callback__to_buf(
+static int diff_patchid_print_callback_to_buf(
 	const git_diff_delta *delta,
 	const git_diff_hunk *hunk,
 	const git_diff_line *line,
@@ -480,7 +480,7 @@ int git_diff_patchid(git_oid *out, git_diff *diff, git_diff_patchid_options *opt
 
 	if ((error = git_diff_print(diff,
 				    GIT_DIFF_FORMAT_PATCH_ID,
-				    git_diff_patchid_print_callback__to_buf,
+				    diff_patchid_print_callback_to_buf,
 				    &args)) < 0)
 		goto out;
 

src/diff_generate.c

@@ -301,14 +301,14 @@ GIT_INLINE(const char *) diff_delta__i2w_path(const git_diff_delta *delta)
 		delta->old_file.path : delta->new_file.path;
 }
 
-int git_diff_delta__i2w_cmp(const void *a, const void *b)
+static int diff_delta_i2w_cmp(const void *a, const void *b)
 {
 	const git_diff_delta *da = a, *db = b;
 	int val = strcmp(diff_delta__i2w_path(da), diff_delta__i2w_path(db));
 	return val ? val : ((int)da->status - (int)db->status);
 }
 
-int git_diff_delta__i2w_casecmp(const void *a, const void *b)
+static int diff_delta_i2w_casecmp(const void *a, const void *b)
 {
 	const git_diff_delta *da = a, *db = b;
 	int val = strcasecmp(diff_delta__i2w_path(da), diff_delta__i2w_path(db));
@@ -361,7 +361,7 @@ static const char *diff_mnemonic_prefix(
 	return pfx;
 }
 
-void git_diff__set_ignore_case(git_diff *diff, bool ignore_case)
+static void diff_set_ignore_case(git_diff *diff, bool ignore_case)
 {
 	if (!ignore_case) {
 		diff->opts.flags &= ~GIT_DIFF_IGNORE_CASE;
@@ -431,7 +431,7 @@ static git_diff_generated *diff_generated_alloc(
 
 	/* Use case-insensitive compare if either iterator has
 	 * the ignore_case bit set */
-	git_diff__set_ignore_case(
+	diff_set_ignore_case(
 		&diff->base,
 		git_iterator_ignore_case(old_iter) ||
 		git_iterator_ignore_case(new_iter));
@@ -1375,7 +1375,7 @@ int git_diff_tree_to_index(
 
 	/* if index is in case-insensitive order, re-sort deltas to match */
 	if (index_ignore_case)
-		git_diff__set_ignore_case(diff, true);
+		diff_set_ignore_case(diff, true);
 
 	*out = diff;
 	diff = NULL;
@@ -1526,7 +1526,7 @@ int git_diff_index_to_index(
 
 	/* if index is in case-insensitive order, re-sort deltas to match */
 	if (old_index->ignore_case || new_index->ignore_case)
-		git_diff__set_ignore_case(diff, true);
+		diff_set_ignore_case(diff, true);
 
 	*out = diff;
 	diff = NULL;
@@ -1583,10 +1583,10 @@ int git_diff__paired_foreach(
 	if (i2w_icase && !icase_mismatch) {
 		strcomp = git__strcasecmp;
 
-		git_vector_set_cmp(&idx2wd->deltas, git_diff_delta__i2w_casecmp);
+		git_vector_set_cmp(&idx2wd->deltas, diff_delta_i2w_casecmp);
 		git_vector_sort(&idx2wd->deltas);
 	} else if (idx2wd != NULL) {
-		git_vector_set_cmp(&idx2wd->deltas, git_diff_delta__i2w_cmp);
+		git_vector_set_cmp(&idx2wd->deltas, diff_delta_i2w_cmp);
 		git_vector_sort(&idx2wd->deltas);
 	}
 

src/diff_print.c

@@ -337,7 +337,7 @@ static int diff_delta_format_with_paths(
 	return git_buf_printf(out, template, oldpath, newpath);
 }
 
-int diff_delta_format_similarity_header(
+static int diff_delta_format_similarity_header(
 	git_buf *out,
 	const git_diff_delta *delta)
 {

src/diff_stats.c

@@ -46,7 +46,7 @@ static int digits_for_value(size_t val)
 	return count;
 }
 
-int git_diff_file_stats__full_to_buf(
+static int diff_file_stats_full_to_buf(
 	git_buf *out,
 	const git_diff_delta *delta,
 	const diff_file_stats *filestat,
@@ -134,7 +134,7 @@ on_error:
 	return (git_buf_oom(out) ? -1 : 0);
 }
 
-int git_diff_file_stats__number_to_buf(
+static int diff_file_stats_number_to_buf(
 	git_buf *out,
 	const git_diff_delta *delta,
 	const diff_file_stats *filestats)
@@ -151,7 +151,7 @@ int git_diff_file_stats__number_to_buf(
 	return error;
 }
 
-int git_diff_file_stats__summary_to_buf(
+static int diff_file_stats_summary_to_buf(
 	git_buf *out,
 	const git_diff_delta *delta)
 {
@@ -288,7 +288,7 @@ int git_diff_stats_to_buf(
 			if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)
 				continue;
 
-			error = git_diff_file_stats__number_to_buf(
+			error = diff_file_stats_number_to_buf(
 				out, delta, &stats->filestats[i]);
 			if (error < 0)
 				return error;
@@ -309,7 +309,7 @@ int git_diff_stats_to_buf(
 			if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)
 				continue;
 
-			error = git_diff_file_stats__full_to_buf(
+			error = diff_file_stats_full_to_buf(
 				out, delta, &stats->filestats[i], stats, width);
 			if (error < 0)
 				return error;
@@ -342,7 +342,7 @@ int git_diff_stats_to_buf(
 			if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)
 				continue;
 
-			error = git_diff_file_stats__summary_to_buf(out, delta);
+			error = diff_file_stats_summary_to_buf(out, delta);
 			if (error < 0)
 				return error;
 		}

src/filter.c

@@ -941,7 +941,7 @@ out:
 	return error;
 }
 
-void stream_list_free(git_vector *streams)
+static void filter_streams_free(git_vector *streams)
 {
 	git_writestream *stream;
 	size_t i;
@@ -990,7 +990,7 @@ done:
 
 	if (fd >= 0)
 		p_close(fd);
-	stream_list_free(&filter_streams);
+	filter_streams_free(&filter_streams);
 	git_buf_dispose(&abspath);
 	return error;
 }
@@ -1018,7 +1018,7 @@ out:
 	if (initialized)
 		error |= stream_start->close(stream_start);
 
-	stream_list_free(&filter_streams);
+	filter_streams_free(&filter_streams);
 	return error;
 }
 

src/merge.c

@@ -80,7 +80,7 @@ static int cache_invalid_marker;
 
 /* Merge base computation */
 
-int merge_bases_many(git_commit_list **out, git_revwalk **walk_out, git_repository *repo, size_t length, const git_oid input_array[])
+static int merge_bases_many(git_commit_list **out, git_revwalk **walk_out, git_repository *repo, size_t length, const git_oid input_array[])
 {
 	git_revwalk *walk = NULL;
 	git_vector list;
@@ -2845,7 +2845,7 @@ on_error:
 	return error;
 }
 
-const char *merge_their_label(const char *branchname)
+static const char *merge_their_label(const char *branchname)
 {
 	const char *slash;
 

src/merge_file.c

@@ -28,7 +28,7 @@
 
 #define GIT_MERGE_FILE_SIDE_EXISTS(X)	((X)->mode != 0)
 
-int git_merge_file__input_from_index(
+static int merge_file_input_from_index(
 	git_merge_file_input *input_out,
 	git_odb_object **odb_object_out,
 	git_odb *odb,
@@ -276,17 +276,15 @@ int git_merge_file_from_index(
 		goto done;
 
 	if (ancestor) {
-		if ((error = git_merge_file__input_from_index(
+		if ((error = merge_file_input_from_index(
 			&ancestor_input, &odb_object[0], odb, ancestor)) < 0)
 			goto done;
 
 		ancestor_ptr = &ancestor_input;
 	}
 
-	if ((error = git_merge_file__input_from_index(
-			&our_input, &odb_object[1], odb, ours)) < 0 ||
-		(error = git_merge_file__input_from_index(
-			&their_input, &odb_object[2], odb, theirs)) < 0)
+	if ((error = merge_file_input_from_index(&our_input, &odb_object[1], odb, ours)) < 0 ||
+	    (error = merge_file_input_from_index(&their_input, &odb_object[2], odb, theirs)) < 0)
 		goto done;
 
 	error = merge_file__from_inputs(out,

src/pack-objects.c

@@ -1642,7 +1642,7 @@ static int mark_edges_uninteresting(git_packbuilder *pb, git_commit_list *commit
 	return 0;
 }
 
-int insert_tree(git_packbuilder *pb, git_tree *tree)
+static int pack_objects_insert_tree(git_packbuilder *pb, git_tree *tree)
 {
 	size_t i;
 	int error;
@@ -1669,7 +1669,7 @@ int insert_tree(git_packbuilder *pb, git_tree *tree)
 			if ((error = git_tree_lookup(&subtree, pb->repo, entry_id)) < 0)
 				return error;
 
-			error = insert_tree(pb, subtree);
+			error = pack_objects_insert_tree(pb, subtree);
 			git_tree_free(subtree);
 
 			if (error < 0)
@@ -1695,7 +1695,7 @@ int insert_tree(git_packbuilder *pb, git_tree *tree)
 	return error;
 }
 
-int insert_commit(git_packbuilder *pb, struct walk_object *obj)
+static int pack_objects_insert_commit(git_packbuilder *pb, struct walk_object *obj)
 {
 	int error;
 	git_commit *commit = NULL;
@@ -1712,7 +1712,7 @@ int insert_commit(git_packbuilder *pb, struct walk_object *obj)
 	if ((error = git_tree_lookup(&tree, pb->repo, git_commit_tree_id(commit))) < 0)
 		goto cleanup;
 
-	if ((error = insert_tree(pb, tree)) < 0)
+	if ((error = pack_objects_insert_tree(pb, tree)) < 0)
 		goto cleanup;
 
 cleanup:
@@ -1747,7 +1747,7 @@ int git_packbuilder_insert_walk(git_packbuilder *pb, git_revwalk *walk)
 		if (obj->seen || obj->uninteresting)
 			continue;
 
-		if ((error = insert_commit(pb, obj)) < 0)
+		if ((error = pack_objects_insert_commit(pb, obj)) < 0)
 			return error;
 	}
 

src/patch_parse.c

@@ -941,7 +941,7 @@ static int parse_patch_body(
 		return parse_patch_hunks(patch, ctx);
 }
 
-int check_header_names(
+static int check_header_names(
 	const char *one,
 	const char *two,
 	const char *old_or_new,

src/path.c

@@ -322,7 +322,7 @@ int git_path_root(const char *path)
 	return -1;	/* Not a real error - signals that path is not rooted */
 }
 
-void git_path_trim_slashes(git_buf *path)
+static void path_trim_slashes(git_buf *path)
 {
 	int ceiling = git_path_root(path->ptr) + 1;
 	assert(ceiling >= 0);
@@ -1219,7 +1219,7 @@ int git_path_diriter_init(
 	if (git_buf_puts(&diriter->path_utf8, path) < 0)
 		return -1;
 
-	git_path_trim_slashes(&diriter->path_utf8);
+	path_trim_slashes(&diriter->path_utf8);
 
 	if (diriter->path_utf8.size == 0) {
 		git_error_set(GIT_ERROR_FILESYSTEM, "could not open directory '%s'", path);
@@ -1368,7 +1368,7 @@ int git_path_diriter_init(
 	if (git_buf_puts(&diriter->path, path) < 0)
 		return -1;
 
-	git_path_trim_slashes(&diriter->path);
+	path_trim_slashes(&diriter->path);
 
 	if (diriter->path.size == 0) {
 		git_error_set(GIT_ERROR_FILESYSTEM, "could not open directory '%s'", path);

src/pool.c

@@ -21,7 +21,7 @@ struct git_pool_page {
 
 static void *pool_alloc_page(git_pool *pool, size_t size);
 
-size_t git_pool__system_page_size(void)
+static size_t pool_system_page_size(void)
 {
 	static size_t size = 0;
 
@@ -44,7 +44,7 @@ int git_pool_init(git_pool *pool, size_t item_size)
 
 	memset(pool, 0, sizeof(git_pool));
 	pool->item_size = item_size;
-	pool->page_size = git_pool__system_page_size();
+	pool->page_size = pool_system_page_size();
 
 	return 0;
 }

src/refs.c

@@ -480,7 +480,7 @@ static int reference__create(
 	return 0;
 }
 
-int configured_ident(git_signature **out, const git_repository *repo)
+static int refs_configured_ident(git_signature **out, const git_repository *repo)
 {
 	if (repo->ident_name && repo->ident_email)
 		return git_signature_now(out, repo->ident_name, repo->ident_email);
@@ -494,7 +494,7 @@ int git_reference__log_signature(git_signature **out, git_repository *repo)
 	int error;
 	git_signature *who;
 
-	if(((error = configured_ident(&who, repo)) < 0) &&
+	if(((error = refs_configured_ident(&who, repo)) < 0) &&
 	   ((error = git_signature_default(&who, repo)) < 0) &&
 	   ((error = git_signature_now(&who, "unknown", "unknown")) < 0))
 		return error;

src/remote.c

@@ -686,7 +686,7 @@ int git_remote__urlfordirection(git_buf *url_out, struct git_remote *remote, int
 	return resolve_url(url_out, url, direction, callbacks);
 }
 
-int set_transport_callbacks(git_transport *t, const git_remote_callbacks *cbs)
+static int remote_transport_set_callbacks(git_transport *t, const git_remote_callbacks *cbs)
 {
 	if (!t->set_callbacks || !cbs)
 		return 0;
@@ -744,7 +744,7 @@ int git_remote__connect(git_remote *remote, git_direction direction, const git_r
 	if ((error = set_transport_custom_headers(t, conn->custom_headers)) != 0)
 		goto on_error;
 
-	if ((error = set_transport_callbacks(t, callbacks)) < 0 ||
+	if ((error = remote_transport_set_callbacks(t, callbacks)) < 0 ||
 	    (error = t->connect(t, url.ptr, credentials, payload, conn->proxy, direction, flags)) != 0)
 		goto on_error;
 

src/revparse.c

@@ -659,7 +659,7 @@ static int ensure_left_hand_identifier_is_not_known_yet(git_object *object, git_
 	return GIT_EINVALIDSPEC;
 }
 
-int revparse__ext(
+static int revparse(
 	git_object **object_out,
 	git_reference **reference_out,
 	size_t *identifier_len_out,
@@ -835,7 +835,7 @@ int git_revparse_ext(
 	git_object *obj = NULL;
 	git_reference *ref = NULL;
 
-	if ((error = revparse__ext(&obj, &ref, &identifier_len, repo, spec)) < 0)
+	if ((error = revparse(&obj, &ref, &identifier_len, repo, spec)) < 0)
 		goto cleanup;
 
 	*object_out = obj;

src/submodule.c

@@ -958,7 +958,7 @@ cleanup:
 	return error;
 }
 
-const char *git_submodule_update_to_str(git_submodule_update_t update)
+static const char *submodule_update_to_str(git_submodule_update_t update)
 {
 	int i;
 	for (i = 0; i < (int)ARRAY_SIZE(_sm_update_map); ++i)
@@ -1401,7 +1401,7 @@ int git_submodule_init(git_submodule *sm, int overwrite)
 	/* write "submodule.NAME.update" if not default */
 
 	val = (sm->update == GIT_SUBMODULE_UPDATE_CHECKOUT) ?
-		NULL : git_submodule_update_to_str(sm->update);
+		NULL : submodule_update_to_str(sm->update);
 
 	if ((error = git_buf_printf(&key, "submodule.%s.update", sm->name)) < 0 ||
 		(error = git_config__update_entry(
@@ -1838,7 +1838,7 @@ int git_submodule_parse_update(git_submodule_update_t *out, const char *value)
 	return 0;
 }
 
-int git_submodule_parse_recurse(git_submodule_recurse_t *out, const char *value)
+static int submodule_parse_recurse(git_submodule_recurse_t *out, const char *value)
 {
 	int val;
 
@@ -1934,7 +1934,7 @@ static int submodule_read_config(git_submodule *sm, git_config *cfg)
 
 	if ((error = get_value(&value, cfg, &key, sm->name, "fetchRecurseSubmodules")) == 0) {
 		in_config = 1;
-		if ((error = git_submodule_parse_recurse(&sm->fetch_recurse, value)) < 0)
+		if ((error = submodule_parse_recurse(&sm->fetch_recurse, value)) < 0)
 			goto cleanup;
 		sm->fetch_recurse_default = sm->fetch_recurse;
 	} else if (error != GIT_ENOTFOUND) {

src/transports/httpclient.c

@@ -445,7 +445,7 @@ GIT_INLINE(int) client_write_request(git_http_client *client)
 				      0);
 }
 
-const char *name_for_method(git_http_method method)
+static const char *name_for_method(git_http_method method)
 {
 	switch (method) {
 	case GIT_HTTP_METHOD_GET:

src/util.c

@@ -777,7 +777,7 @@ static const int8_t utf8proc_utf8class[256] = {
 	4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0
 };
 
-int git__utf8_charlen(const uint8_t *str, size_t str_len)
+static int util_utf8_charlen(const uint8_t *str, size_t str_len)
 {
 	size_t length, i;
 
@@ -802,7 +802,7 @@ int git__utf8_iterate(const uint8_t *str, int str_len, int32_t *dst)
 	int32_t uc = -1;
 
 	*dst = -1;
-	length = git__utf8_charlen(str, str_len);
+	length = util_utf8_charlen(str, str_len);
 	if (length < 0)
 		return -1;
 
@@ -839,7 +839,7 @@ size_t git__utf8_valid_buf_length(const uint8_t *str, size_t str_len)
 	size_t offset = 0;
 
 	while (offset < str_len) {
-		int length = git__utf8_charlen(str + offset, str_len - offset);
+		int length = util_utf8_charlen(str + offset, str_len - offset);
 
 		if (length < 0)
 			break;

src/win32/path_w32.c

@@ -151,7 +151,7 @@ int git_win32_path_canonicalize(git_win32_path path)
 	return (int)(to - path);
 }
 
-int git_win32_path__cwd(wchar_t *out, size_t len)
+static int win32_path_cwd(wchar_t *out, size_t len)
 {
 	int cwd_len;
 
@@ -241,7 +241,7 @@ int git_win32_path_from_utf8(git_win32_path out, const char *src)
 	else {
 		int cwd_len;
 
-		if ((cwd_len = git_win32_path__cwd(dest, MAX_PATH)) < 0)
+		if ((cwd_len = win32_path_cwd(dest, MAX_PATH)) < 0)
 			goto on_error;
 
 		dest[cwd_len++] = L'\\';