Refactor hash_map insert to use single ptr

Previous implementation used a double ptr for inserting into a hash map.
This refactoring allows for only needing to use a single ptr.

Fixes #17 .

src/archiver.c

@@ -931,7 +931,7 @@ int filenames_to_abs_map_fn(void *data, void *ud) {
   }
 
   simple_archiver_hash_map_insert(
-      abs_filenames, fullpath, fullpath, strlen(fullpath) + 1,
+      *abs_filenames, fullpath, fullpath, strlen(fullpath) + 1,
       simple_archiver_helper_datastructure_cleanup_nop, NULL);
 
   // Try putting all parent dirs up to current working directory.
@@ -967,7 +967,7 @@ int filenames_to_abs_map_fn(void *data, void *ud) {
       strncpy(fullpath_dirname_copy, fullpath_dirname,
               strlen(fullpath_dirname) + 1);
       simple_archiver_hash_map_insert(
-          abs_filenames, fullpath_dirname_copy, fullpath_dirname_copy,
+          *abs_filenames, fullpath_dirname_copy, fullpath_dirname_copy,
           strlen(fullpath_dirname_copy) + 1,
           simple_archiver_helper_datastructure_cleanup_nop, NULL);
     }
@@ -1286,7 +1286,7 @@ int simple_archiver_parse_archive_info(FILE *in_f, int do_extract,
       memcpy(key, *iter, len);
       key[len - 1] = 0;
       simple_archiver_hash_map_insert(
-          &hash_map, key, key, len,
+          hash_map, key, key, len,
           simple_archiver_helper_datastructure_cleanup_nop, NULL);
       // fprintf(stderr, "\"%s\" put in map\n", key);
     }

src/data_structures/hash_map.c

@@ -101,12 +101,12 @@ void simple_archiver_hash_map_internal_no_free_fn(
 }
 
 /// Returns 0 on success.
-int simple_archiver_hash_map_internal_rehash(SDArchiverHashMap **hash_map) {
-  if (!hash_map || !*hash_map) {
+int simple_archiver_hash_map_internal_rehash(SDArchiverHashMap *hash_map) {
+  if (!hash_map) {
     return 1;
   }
   SDArchiverHashMap *new_hash_map = malloc(sizeof(SDArchiverHashMap));
-  new_hash_map->buckets_size = (*hash_map)->buckets_size * 2;
+  new_hash_map->buckets_size = hash_map->buckets_size * 2;
   // Pointers have the same size (at least on the same machine), so
   // sizeof(void*) should be ok.
   new_hash_map->buckets = malloc(sizeof(void *) * new_hash_map->buckets_size);
@@ -116,15 +116,14 @@ int simple_archiver_hash_map_internal_rehash(SDArchiverHashMap **hash_map) {
   new_hash_map->count = 0;
 
   // Iterate through the old hash map to populate the new hash map.
-  for (size_t bucket_idx = 0; bucket_idx < (*hash_map)->buckets_size;
+  for (size_t bucket_idx = 0; bucket_idx < hash_map->buckets_size;
        ++bucket_idx) {
-    SDArchiverLLNode *node = (*hash_map)->buckets[bucket_idx]->head;
+    SDArchiverLLNode *node = hash_map->buckets[bucket_idx]->head;
     while (node) {
       node = node->next;
-      if (node && node != (*hash_map)->buckets[bucket_idx]->tail &&
-          node->data) {
+      if (node && node != hash_map->buckets[bucket_idx]->tail && node->data) {
         SDArchiverHashMapData *data = node->data;
-        simple_archiver_hash_map_insert(&new_hash_map, data->value, data->key,
+        simple_archiver_hash_map_insert(new_hash_map, data->value, data->key,
                                         data->key_size, data->value_cleanup_fn,
                                         data->key_cleanup_fn);
         data->key_cleanup_fn = simple_archiver_hash_map_internal_no_free_fn;
@@ -133,8 +132,18 @@ int simple_archiver_hash_map_internal_rehash(SDArchiverHashMap **hash_map) {
     }
   }
 
-  simple_archiver_hash_map_free(hash_map);
-  *hash_map = new_hash_map;
+  // Free the buckets in the old hash_map.
+  for (size_t idx = 0; idx < hash_map->buckets_size; ++idx) {
+    SDArchiverLinkedList **linked_list = hash_map->buckets + idx;
+    simple_archiver_list_free(linked_list);
+  }
+  free(hash_map->buckets);
+
+  // Move the new buckets and related data into the old hash_map.
+  *hash_map = *new_hash_map;
+
+  // `free` the "new_hash_map" as the needed data was moved from it.
+  free(new_hash_map);
 
   return 0;
 }
@@ -167,11 +176,11 @@ void simple_archiver_hash_map_free(SDArchiverHashMap **hash_map) {
   }
 }
 
-int simple_archiver_hash_map_insert(SDArchiverHashMap **hash_map, void *value,
+int simple_archiver_hash_map_insert(SDArchiverHashMap *hash_map, void *value,
                                     void *key, size_t key_size,
                                     void (*value_cleanup_fn)(void *),
                                     void (*key_cleanup_fn)(void *)) {
-  if ((*hash_map)->buckets_size <= (*hash_map)->count) {
+  if (hash_map->buckets_size <= hash_map->count) {
     simple_archiver_hash_map_internal_rehash(hash_map);
   }
 
@@ -184,13 +193,13 @@ int simple_archiver_hash_map_insert(SDArchiverHashMap **hash_map, void *value,
 
   unsigned long long hash =
       simple_archiver_hash_map_internal_key_to_hash(key, key_size) %
-      (*hash_map)->buckets_size;
+      hash_map->buckets_size;
   int result = simple_archiver_list_add_front(
-      (*hash_map)->buckets[hash], data,
+      hash_map->buckets[hash], data,
       simple_archiver_hash_map_internal_cleanup_data);
 
   if (result == 0) {
-    ++(*hash_map)->count;
+    ++hash_map->count;
     return 0;
   } else {
     if (value) {

src/data_structures/hash_map.h

@@ -41,7 +41,7 @@ void simple_archiver_hash_map_free(SDArchiverHashMap **hash_map);
 /// If key_cleanup_fn is NULL, then "free" is used instead.
 /// NOTICE: You must not pass NULL to value, otherwise all "get" checks will
 /// fail for the inserted key.
-int simple_archiver_hash_map_insert(SDArchiverHashMap **hash_map, void *value,
+int simple_archiver_hash_map_insert(SDArchiverHashMap *hash_map, void *value,
                                     void *key, size_t key_size,
                                     void (*value_cleanup_fn)(void *),
                                     void (*key_cleanup_fn)(void *));

src/data_structures/test.c

@@ -145,8 +145,8 @@ int main(void) {
         key = malloc(sizeof(int));
         *value = idx;
         *key = idx;
-        simple_archiver_hash_map_insert(&hash_map, value, key, sizeof(int),
-                                        NULL, NULL);
+        simple_archiver_hash_map_insert(hash_map, value, key, sizeof(int), NULL,
+                                        NULL);
       }
     }
 
@@ -184,7 +184,7 @@ int main(void) {
       *copy_value = idx;
       unsigned int *copy_key = malloc(sizeof(unsigned int));
       *copy_key = idx;
-      simple_archiver_hash_map_insert(&hash_map, copy_value, copy_key,
+      simple_archiver_hash_map_insert(hash_map, copy_value, copy_key,
                                       sizeof(unsigned int), NULL, NULL);
     }
     simple_archiver_hash_map_free(&hash_map);
@@ -193,7 +193,7 @@ int main(void) {
     hash_map = simple_archiver_hash_map_init();
 
     for (size_t idx = 0; idx < SDARCHIVER_DS_TEST_HASH_MAP_ITER_SIZE; ++idx) {
-      simple_archiver_hash_map_insert(&hash_map, (void *)idx, &idx,
+      simple_archiver_hash_map_insert(hash_map, (void *)idx, &idx,
                                       sizeof(size_t), no_free_fn, no_free_fn);
     }
 

src/parser.c

@@ -442,7 +442,7 @@ SDArchiverLinkedList *simple_archiver_parsed_to_filenames(
         simple_archiver_list_add(files_list, file_info,
                                  simple_archiver_internal_free_file_info_fn);
         simple_archiver_hash_map_insert(
-            &hash_map, &hash_map_sentinel, filename, len - 1,
+            hash_map, &hash_map_sentinel, filename, len - 1,
             simple_archiver_helper_datastructure_cleanup_nop,
             simple_archiver_helper_datastructure_cleanup_nop);
       } else {
@@ -541,7 +541,7 @@ SDArchiverLinkedList *simple_archiver_parsed_to_filenames(
                     files_list, file_info,
                     simple_archiver_internal_free_file_info_fn);
                 simple_archiver_hash_map_insert(
-                    &hash_map, &hash_map_sentinel, combined_path,
+                    hash_map, &hash_map_sentinel, combined_path,
                     combined_size - 1,
                     simple_archiver_helper_datastructure_cleanup_nop,
                     simple_archiver_helper_datastructure_cleanup_nop);