From 9bd1618db9e40caad773334921f0a43d9d63e73a Mon Sep 17 00:00:00 2001
From: coreyhuinker <corey.huinker@gmail.com>
Date: Mon, 30 Oct 2023 16:21:30 -0400
Subject: [PATCH v2 1/4] Additional internal jsonb access functions.

Make JsonbContainerTypeName externally visible.

Add JsonbStringValueToCString.
---
 src/include/utils/jsonb.h          |  4 ++++
 src/backend/utils/adt/jsonb.c      |  2 +-
 src/backend/utils/adt/jsonb_util.c | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/include/utils/jsonb.h b/src/include/utils/jsonb.h
index addc9b608e..b3c1e104f2 100644
--- a/src/include/utils/jsonb.h
+++ b/src/include/utils/jsonb.h
@@ -424,6 +424,8 @@ extern char *JsonbToCStringIndent(StringInfo out, JsonbContainer *in,
 								  int estimated_len);
 extern bool JsonbExtractScalar(JsonbContainer *jbc, JsonbValue *res);
 extern const char *JsonbTypeName(JsonbValue *val);
+extern const char *JsonbContainerTypeName(JsonbContainer *jbc);
+
 
 extern Datum jsonb_set_element(Jsonb *jb, Datum *path, int path_len,
 							   JsonbValue *newval);
@@ -436,4 +438,6 @@ extern Datum jsonb_build_object_worker(int nargs, const Datum *args, const bool
 extern Datum jsonb_build_array_worker(int nargs, const Datum *args, const bool *nulls,
 									  const Oid *types, bool absent_on_null);
 
+extern char *JsonbStringValueToCString(JsonbValue *j);
+
 #endif							/* __JSONB_H__ */
diff --git a/src/backend/utils/adt/jsonb.c b/src/backend/utils/adt/jsonb.c
index 6f445f5c2b..0ad4e81d89 100644
--- a/src/backend/utils/adt/jsonb.c
+++ b/src/backend/utils/adt/jsonb.c
@@ -160,7 +160,7 @@ jsonb_from_text(text *js, bool unique_keys)
 /*
  * Get the type name of a jsonb container.
  */
-static const char *
+const char *
 JsonbContainerTypeName(JsonbContainer *jbc)
 {
 	JsonbValue	scalar;
diff --git a/src/backend/utils/adt/jsonb_util.c b/src/backend/utils/adt/jsonb_util.c
index 9cc95b773d..ae311b38ba 100644
--- a/src/backend/utils/adt/jsonb_util.c
+++ b/src/backend/utils/adt/jsonb_util.c
@@ -1992,3 +1992,18 @@ uniqueifyJsonbObject(JsonbValue *object, bool unique_keys, bool skip_nulls)
 		}
 	}
 }
+
+/*
+ * Extract a JsonbValue as a cstring.
+ */
+char *JsonbStringValueToCString(JsonbValue *j)
+{
+	char *s;
+
+	Assert(j->type == jbvString);
+	/* make a string that we are sure is null-terminated */
+	s = palloc(j->val.string.len + 1);
+	memcpy(s, j->val.string.val, j->val.string.len);
+	s[j->val.string.len] = '\0';
+	return s;
+}
-- 
2.41.0