T5528: add adapter interface

Expose legacy set/delete functions in a form suitable for external
calls.

3 files changed, 135 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
index 2170f95..6ef8d64 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -52,6 +52,7 @@ src_libvyatta_cfg_la_SOURCES += src/cnode/cnode-algorithm.cpp
 src_libvyatta_cfg_la_SOURCES += src/cparse/cparse.cpp
 src_libvyatta_cfg_la_SOURCES += src/cparse/cparse_lex.c
 src_libvyatta_cfg_la_SOURCES += src/commit/commit-algorithm.cpp
+src_libvyatta_cfg_la_SOURCES += src/vy_adapter.cpp
 CLEANFILES = src/cli_parse.c src/cli_parse.h src/cli_def.c src/cli_val.c
 CLEANFILES += src/cparse/cparse.cpp src/cparse/cparse.h
 CLEANFILES += src/cparse/cparse_lex.c
@@ -61,6 +62,7 @@ LDADD += $(GOBJECT_LIBS)
 
 vincludedir = $(includedir)/vyatta-cfg
 vinclude_HEADERS = src/cli_cstore.h
+vinclude_HEADERS += src/vy_adapter.h
 
 vcincdir = $(vincludedir)/cstore
 vcinc_HEADERS = src/cstore/cstore-c.h
diff --git a/src/vy_adapter.cpp b/src/vy_adapter.cpp
new file mode 100644
index 0000000..793728f
--- /dev/null
+++ b/src/vy_adapter.cpp
@@ -0,0 +1,102 @@
+/* Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <cstring>
+#include <cstdlib>
+#include <vector>
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <cstdint>
+#include <cassert>
+
+#include <cstore/cstore.hpp>
+#include <vy_adapter.h>
+
+using namespace cstore;
+
+static uint64_t uint_of_voidptr(void* p)
+{
+  assert (((uintptr_t) p & 1) == 0);
+  return (uint64_t) p | 1;
+}
+
+static void *voidptr_of_uint(uint64_t v)
+{
+  return (void *)(uintptr_t)(v & ~1);
+}
+
+static Cstore *cstore_of_handle(uint64_t handle)
+{
+    return (Cstore *) voidptr_of_uint(handle);
+}
+
+uint64_t
+vy_cstore_init(void)
+{
+    Cstore *handle = Cstore::createCstore(false);
+    return uint_of_voidptr(handle);
+}
+
+void
+vy_cstore_free(uint64_t handle)
+{
+    Cstore *h = cstore_of_handle(handle);
+    delete h;
+}
+
+int
+vy_in_session(uint64_t handle)
+{
+    Cstore *h = cstore_of_handle(handle);
+    return h->inSession() ? 1 : 0;
+}
+
+int
+vy_set_path(uint64_t handle, const void** path_ptr, size_t len)
+{
+    Cstore *cstore = cstore_of_handle(handle);
+    const char **path = (const char **) path_ptr;
+    Cpath path_comps = Cpath(path, len);
+    int res;
+
+    res = cstore->validateSetPath(path_comps);
+    if (!res) {
+        return 1;
+    }
+
+    res = cstore->setCfgPath(path_comps);
+    if (!res) {
+        return 2;
+    }
+
+    return 0;
+}
+
+int
+vy_delete_path(uint64_t handle, const void** path_ptr, size_t len)
+{
+    Cstore *cstore = cstore_of_handle(handle);
+    const char **path = (const char **) path_ptr;
+    Cpath path_comps = Cpath(path, len);
+    int res;
+
+    res = cstore->deleteCfgPath(path_comps);
+    if (!res) {
+        return 1;
+    }
+
+    return 0;
+}
diff --git a/src/vy_adapter.h b/src/vy_adapter.h
new file mode 100644
index 0000000..8e0f376
--- /dev/null
+++ b/src/vy_adapter.h
@@ -0,0 +1,31 @@
+/* Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _VY_ADAPTER_H_
+#define _VY_ADAPTER_H_
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+uint64_t vy_cstore_init(void);
+void vy_cstore_free(uint64_t);
+int vy_in_session(uint64_t);
+int vy_set_path(uint64_t, const void **, size_t);
+int vy_delete_path(uint64_t, const void **, size_t);
+
+#ifdef __cplusplus
+}
+#endif
+#endif