[PATCH v2 4/5] config: add git_configset_alloc() and git_configset_clear_and_free()

[Josh Steadmon <steadmon@google.com>]

Add git_configset_alloc() and git_configset_clear_and_free() functions
so that callers can manage config_set structs on the heap. This also
allows non-C external consumers to treat config_sets as opaque structs.

Co-authored-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Josh Steadmon <steadmon@google.com>
---
 config.c | 11 +++++++++++
 config.h | 10 ++++++++++
 2 files changed, 21 insertions(+)

diff --git a/config.c b/config.c
index 6421894614..444db8de79 100644
--- a/config.c
+++ b/config.c
@@ -2324,6 +2324,11 @@ static int config_set_element_cmp(const void *cmp_data UNUSED,
 	return strcmp(e1->key, e2->key);
 }
 
+struct config_set *git_configset_alloc(void)
+{
+	return xmalloc(sizeof(struct config_set));
+}
+
 void git_configset_init(struct config_set *set)
 {
 	hashmap_init(&set->config_hash, config_set_element_cmp, NULL, 0);
@@ -2353,6 +2358,12 @@ void git_configset_clear(struct config_set *set)
 	set->list.items = NULL;
 }
 
+void git_configset_clear_and_free(struct config_set *set)
+{
+	git_configset_clear(set);
+	free(set);
+}
+
 static int config_set_callback(const char *key, const char *value,
 			       const struct config_context *ctx,
 			       void *cb)
diff --git a/config.h b/config.h
index 54b47dec9e..074c85a788 100644
--- a/config.h
+++ b/config.h
@@ -472,6 +472,11 @@ struct config_set {
 	struct configset_list list;
 };
 
+/**
+ * Alloc a config_set
+ */
+struct config_set *git_configset_alloc(void);
+
 /**
  * Initializes the config_set `cs`.
  */
@@ -520,6 +525,11 @@ int git_configset_get_string_multi(struct config_set *cs, const char *key,
  */
 void git_configset_clear(struct config_set *cs);
 
+/**
+ * Clears and frees a heap-allocated `config_set` structure.
+ */
+void git_configset_clear_and_free(struct config_set *cs);
+
 /*
  * These functions return 1 if not found, and 0 if found, leaving the found
  * value in the 'dest' pointer.
-- 
2.46.0.76.ge559c4bf1a-goog