1 files changed, 201 insertions, 0 deletions
diff --git a/tests/libgit2/core/structinit.c b/tests/libgit2/core/structinit.c
new file mode 100644
index 000000000..160e2f612
--- /dev/null
+++ b/tests/libgit2/core/structinit.c
@@ -0,0 +1,201 @@
+#include "clar_libgit2.h"
+#include <git2/sys/commit_graph.h>
+#include <git2/sys/config.h>
+#include <git2/sys/filter.h>
+#include <git2/sys/odb_backend.h>
+#include <git2/sys/refdb_backend.h>
+#include <git2/sys/transport.h>
+
+#define STRINGIFY(s) #s
+
+/* Checks two conditions for the specified structure:
+ *     1. That the initializers for the latest version produces the same
+ *        in-memory representation.
+ *     2. That the function-based initializer supports all versions from 1...n,
+ *        where n is the latest version (often represented by GIT_*_VERSION).
+ *
+ * Parameters:
+ *     structname: The name of the structure to test, e.g. git_blame_options.
+ *     structver: The latest version of the specified structure.
+ *     macroinit: The macro that initializes the latest version of the structure.
+ *     funcinitname: The function that initializes the structure. Must have the
+ *                   signature "int (structname* instance, int version)".
+ */
+#define CHECK_MACRO_FUNC_INIT_EQUAL(structname, structver, macroinit, funcinitname) \
+do { \
+	structname structname##_macro_latest = macroinit; \
+	structname structname##_func_latest; \
+	int structname##_curr_ver = structver - 1; \
+	memset(&structname##_func_latest, 0, sizeof(structname##_func_latest)); \
+	cl_git_pass(funcinitname(&structname##_func_latest, structver)); \
+	options_cmp(&structname##_macro_latest, &structname##_func_latest, \
+		sizeof(structname), STRINGIFY(structname)); \
+	\
+	while (structname##_curr_ver > 0) \
+	{ \
+		structname macro; \
+		cl_git_pass(funcinitname(&macro, structname##_curr_ver)); \
+		structname##_curr_ver--; \
+	}\
+} while(0)
+
+static void options_cmp(void *one, void *two, size_t size, const char *name)
+{
+	size_t i;
+
+	for (i = 0; i < size; i++) {
+		if (((char *)one)[i] != ((char *)two)[i]) {
+			char desc[1024];
+
+			p_snprintf(desc, 1024, "Difference in %s at byte %" PRIuZ ": macro=%u / func=%u",
+				name, i, ((char *)one)[i], ((char *)two)[i]);
+			clar__fail(__FILE__, __func__, __LINE__,
+				"Difference between macro and function options initializer",
+				desc, 0);
+			return;
+		}
+	}
+}
+
+void test_core_structinit__compare(void)
+{
+	/* These tests assume that they can memcmp() two structures that were
+	 * initialized with the same static initializer.  Eg,
+	 * git_blame_options = GIT_BLAME_OPTIONS_INIT;
+	 *
+	 * This assumption fails when there is padding between structure members,
+	 * which is not guaranteed to be initialized to anything sane at all.
+	 *
+	 * Assume most compilers, in a debug build, will clear that memory for
+	 * us or set it to sentinel markers.  Etc.
+	 */
+#if !defined(DEBUG) && !defined(_DEBUG)
+	clar__skip();
+#endif
+
+	/* apply */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_apply_options, GIT_APPLY_OPTIONS_VERSION, \
+		GIT_APPLY_OPTIONS_INIT, git_apply_options_init);
+
+	/* blame */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_blame_options, GIT_BLAME_OPTIONS_VERSION, \
+		GIT_BLAME_OPTIONS_INIT, git_blame_options_init);
+
+	/* blob_filter_options */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_blob_filter_options, GIT_BLOB_FILTER_OPTIONS_VERSION, \
+		GIT_BLOB_FILTER_OPTIONS_INIT, git_blob_filter_options_init);
+
+	/* checkout */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_checkout_options, GIT_CHECKOUT_OPTIONS_VERSION, \
+		GIT_CHECKOUT_OPTIONS_INIT, git_checkout_options_init);
+
+	/* clone */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_clone_options, GIT_CLONE_OPTIONS_VERSION, \
+		GIT_CLONE_OPTIONS_INIT, git_clone_options_init);
+
+	/* commit_graph_writer */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_commit_graph_writer_options, \
+		GIT_COMMIT_GRAPH_WRITER_OPTIONS_VERSION, \
+		GIT_COMMIT_GRAPH_WRITER_OPTIONS_INIT, \
+		git_commit_graph_writer_options_init);
+
+	/* diff */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_options, GIT_DIFF_OPTIONS_VERSION, \
+		GIT_DIFF_OPTIONS_INIT, git_diff_options_init);
+
+	/* diff_find */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_find_options, GIT_DIFF_FIND_OPTIONS_VERSION, \
+		GIT_DIFF_FIND_OPTIONS_INIT, git_diff_find_options_init);
+
+	/* filter */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_filter, GIT_FILTER_VERSION, \
+		GIT_FILTER_INIT, git_filter_init);
+
+	/* merge_file_input */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_file_input, GIT_MERGE_FILE_INPUT_VERSION, \
+		GIT_MERGE_FILE_INPUT_INIT, git_merge_file_input_init);
+
+	/* merge_file */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_file_options, GIT_MERGE_FILE_OPTIONS_VERSION, \
+		GIT_MERGE_FILE_OPTIONS_INIT, git_merge_file_options_init);
+
+	/* merge_tree */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_options, GIT_MERGE_OPTIONS_VERSION, \
+		GIT_MERGE_OPTIONS_INIT, git_merge_options_init);
+
+	/* push */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_push_options, GIT_PUSH_OPTIONS_VERSION, \
+		GIT_PUSH_OPTIONS_INIT, git_push_options_init);
+
+	/* remote */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_remote_callbacks, GIT_REMOTE_CALLBACKS_VERSION, \
+		GIT_REMOTE_CALLBACKS_INIT, git_remote_init_callbacks);
+
+	/* repository_init */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_repository_init_options, GIT_REPOSITORY_INIT_OPTIONS_VERSION, \
+		GIT_REPOSITORY_INIT_OPTIONS_INIT, git_repository_init_options_init);
+
+	/* revert */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_revert_options, GIT_REVERT_OPTIONS_VERSION, \
+		GIT_REVERT_OPTIONS_INIT, git_revert_options_init);
+
+	/* stash apply */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_stash_apply_options, GIT_STASH_APPLY_OPTIONS_VERSION, \
+		GIT_STASH_APPLY_OPTIONS_INIT, git_stash_apply_options_init);
+
+	/* status */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_status_options, GIT_STATUS_OPTIONS_VERSION, \
+		GIT_STATUS_OPTIONS_INIT, git_status_options_init);
+
+	/* transport */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_transport, GIT_TRANSPORT_VERSION, \
+		GIT_TRANSPORT_INIT, git_transport_init);
+
+	/* config_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_config_backend, GIT_CONFIG_BACKEND_VERSION, \
+		GIT_CONFIG_BACKEND_INIT, git_config_init_backend);
+
+	/* odb_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_odb_backend, GIT_ODB_BACKEND_VERSION, \
+		GIT_ODB_BACKEND_INIT, git_odb_init_backend);
+
+	/* refdb_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_refdb_backend, GIT_REFDB_BACKEND_VERSION, \
+		GIT_REFDB_BACKEND_INIT, git_refdb_init_backend);
+
+	/* submodule update */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_submodule_update_options, GIT_SUBMODULE_UPDATE_OPTIONS_VERSION, \
+		GIT_SUBMODULE_UPDATE_OPTIONS_INIT, git_submodule_update_options_init);
+
+	/* submodule update */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_proxy_options, GIT_PROXY_OPTIONS_VERSION, \
+		GIT_PROXY_OPTIONS_INIT, git_proxy_options_init);
+
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_patchid_options, GIT_DIFF_PATCHID_OPTIONS_VERSION, \
+		GIT_DIFF_PATCHID_OPTIONS_INIT, git_diff_patchid_options_init);
+}