hashmap_get_next takes "const struct hashmap_entry *"

This is less error-prone than "const void *" as the compiler
now detects invalid types being passed.

Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff.c

@@ -1036,7 +1036,7 @@ static void pmb_advance_or_null_multi_match(struct diff_options *o,
 	int i;
 	char *got_match = xcalloc(1, pmb_nr);
 
-	for (; match; match = hashmap_get_next(hm, match)) {
+	for (; match; match = hashmap_get_next(hm, &match->ent)) {
 		for (i = 0; i < pmb_nr; i++) {
 			struct moved_entry *prev = pmb[i].match;
 			struct moved_entry *cur = (prev && prev->next_line) ?
@@ -1189,7 +1189,8 @@ static void mark_color_as_moved(struct diff_options *o,
 			 * The current line is the start of a new block.
 			 * Setup the set of potential blocks.
 			 */
-			for (; match; match = hashmap_get_next(hm, match)) {
+			for (; match; match = hashmap_get_next(hm,
+								&match->ent)) {
 				ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
 				if (o->color_moved_ws_handling &
 				    COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {

diffcore-rename.c

@@ -285,7 +285,7 @@ static int find_identical_files(struct hashmap *srcs,
 	p = hashmap_get_from_hash(srcs,
 				  hash_filespec(options->repo, target),
 				  NULL);
-	for (; p; p = hashmap_get_next(srcs, p)) {
+	for (; p; p = hashmap_get_next(srcs, &p->entry)) {
 		int score;
 		struct diff_filespec *source = p->filespec;
 

hashmap.c

@@ -191,9 +191,10 @@ void *hashmap_get(const struct hashmap *map, const void *key, const void *keydat
 	return *find_entry_ptr(map, key, keydata);
 }
 
-void *hashmap_get_next(const struct hashmap *map, const void *entry)
+void *hashmap_get_next(const struct hashmap *map,
+			const struct hashmap_entry *entry)
 {
-	struct hashmap_entry *e = ((struct hashmap_entry *) entry)->next;
+	struct hashmap_entry *e = entry->next;
 	for (; e; e = e->next)
 		if (entry_equals(map, entry, e, NULL))
 			return e;

hashmap.h

@@ -318,7 +318,8 @@ static inline void *hashmap_get_from_hash(const struct hashmap *map,
  * `entry` is the hashmap_entry to start the search from, obtained via a previous
  * call to `hashmap_get` or `hashmap_get_next`.
  */
-void *hashmap_get_next(const struct hashmap *map, const void *entry);
+void *hashmap_get_next(const struct hashmap *map,
+			const struct hashmap_entry *entry);
 
 /*
  * Adds a hashmap entry. This allows to add duplicate entries (i.e.

name-hash.c

@@ -710,7 +710,7 @@ struct cache_entry *index_file_exists(struct index_state *istate, const char *na
 	while (ce) {
 		if (same_name(ce, name, namelen, icase))
 			return ce;
-		ce = hashmap_get_next(&istate->name_hash, ce);
+		ce = hashmap_get_next(&istate->name_hash, &ce->ent);
 	}
 	return NULL;
 }

t/helper/test-hashmap.c

@@ -203,7 +203,7 @@ int cmd__hashmap(int argc, const char **argv)
 				puts("NULL");
 			while (entry) {
 				puts(get_value(entry));
-				entry = hashmap_get_next(&map, entry);
+				entry = hashmap_get_next(&map, &entry->ent);
 			}
 
 		} else if (!strcmp("remove", cmd) && p1) {