From e6fca772f02564a63847bb2103ad754f1a42ffae Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Sun, 27 Apr 2014 00:24:13 +0200
Subject: [PATCH] dbi utils: Added compat layer for DBI < 0.9.

---
 src/utils/dbi.c         | 56 +++++++++++++++++++++++++++++++++++++++++
 t/unit/utils/dbi_test.c | 43 +++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)

diff --git a/src/utils/dbi.c b/src/utils/dbi.c
index de2348e..b1fdaf1 100644
--- a/src/utils/dbi.c
+++ b/src/utils/dbi.c
@@ -41,6 +41,62 @@
 #include <stdlib.h>
 #include <string.h>
 
+/*
+ * pre 0.9 DBI compat layer
+ */
+
+#if LIBDBI_VERSION < 900
+#include <pthread.h>
+
+typedef void *dbi_inst;
+
+static pthread_mutex_t dbi_lock = PTHREAD_MUTEX_INITIALIZER;
+static int dbi_initialized = 0;
+
+static int
+initialize_r(const char *driverdir, dbi_inst __attribute__((unused)) *pInst)
+{
+	int status = 0;
+	pthread_mutex_lock(&dbi_lock);
+	if (! dbi_initialized)
+		status = dbi_initialize(driverdir);
+	dbi_initialized = 1;
+	pthread_mutex_unlock(&dbi_lock);
+	return status;
+} /* initialize_r */
+
+static dbi_driver
+driver_open_r(const char *name, dbi_inst __attribute__((unused)) Inst)
+{
+	dbi_driver driver;
+	pthread_mutex_lock(&dbi_lock);
+	driver = dbi_driver_open(name);
+	pthread_mutex_unlock(&dbi_lock);
+	return driver;
+} /* driver_open_r */
+
+static dbi_driver
+driver_list_r(dbi_driver Current, dbi_inst __attribute__((unused)) Inst)
+{
+	dbi_driver driver;
+	pthread_mutex_lock(&dbi_lock);
+	driver = dbi_driver_list(Current);
+	pthread_mutex_unlock(&dbi_lock);
+	return driver;
+} /* driver_list_r */
+
+static void
+shutdown_r(dbi_inst __attribute__((unused)) Inst)
+{
+	/* do nothing; we don't know if DBI is still in use */
+} /* shutdown_r */
+
+#define dbi_initialize_r initialize_r
+#define dbi_driver_open_r driver_open_r
+#define dbi_driver_list_r driver_list_r
+#define dbi_shutdown_r shutdown_r
+#endif /* LIBDBI_VERSION < 900 */
+
 /*
  * private data types
  */
diff --git a/t/unit/utils/dbi_test.c b/t/unit/utils/dbi_test.c
index 8a21ace..8a0811b 100644
--- a/t/unit/utils/dbi_test.c
+++ b/t/unit/utils/dbi_test.c
@@ -146,6 +146,19 @@ static mock_query_t *current_query = NULL;
 
 /* dbi_driver, dbi_conn, dbi_result are void pointers */
 
+#if LIBDBI_VERSION < 900
+typedef void *dbi_inst;
+
+int
+dbi_initialize_r(const char *driverdir, dbi_inst *pInst);
+void
+dbi_shutdown_r(dbi_inst inst);
+dbi_driver
+dbi_driver_open_r(const char *name, dbi_inst inst);
+dbi_driver
+dbi_driver_list_r(dbi_driver curr, dbi_inst inst);
+#endif
+
 int
 dbi_initialize_r(const char __attribute__((unused)) *driverdir,
 		dbi_inst __attribute__((unused)) *pInst)
@@ -174,6 +187,36 @@ dbi_driver_list_r(dbi_driver curr, dbi_inst __attribute__((unused)) inst)
 	return NULL;
 } /* dbi_driver_list */
 
+#if LIBDBI_VERSION < 900
+int
+dbi_initialize(const char *driverdir)
+{
+	return dbi_initialize_r(driverdir, NULL);
+} /* dbi_initialize */
+
+/* for some weird reason, gcc and clang complain about a missing prototype for
+ * dbi_shutdown; however, the function is declared in dbi/dbi.h */
+void
+dbi_shutdown(void);
+void
+dbi_shutdown(void)
+{
+	dbi_shutdown_r(NULL);
+} /* dbi_shutdown */
+
+dbi_driver
+dbi_driver_open(const char *name)
+{
+	return dbi_driver_open_r(name, NULL);
+} /* dbi_driver_open */
+
+dbi_driver
+dbi_driver_list(dbi_driver curr)
+{
+	return dbi_driver_list_r(curr, NULL);
+} /* dbi_driver_list */
+#endif
+
 const char *
 dbi_driver_get_name(dbi_driver driver)
 {
-- 
2.30.2