Make installation directories overridable at runtime.

[sliver-openvswitch.git] / lib / dirs.c.in

diff --git a/lib/dirs.c.in b/lib/dirs.c.in
new file mode 100644 (file)
index 0000000..a174ab3
--- /dev/null
+++ b/lib/dirs.c.in
@@ -0,0 +1,66 @@
+#line 2 "@srcdir@/lib/dirs.c.in"
+/*
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+#include "dirs.h"
+#include <stdlib.h>
+
+struct directory {
+    const char *value;          /* Actual value; NULL if not yet determined. */
+    const char *default_value;  /* Default value. */
+    const char *var_name;       /* Environment variable to override default. */
+};
+
+static const char *
+get_dir(struct directory *d)
+{
+    if (!d->value) {
+        d->value = getenv(d->var_name);
+        if (!d->value || !d->value[0]) {
+            d->value = d->default_value;
+        }
+    }
+    return d->value;
+}
+
+const char *
+ovs_pkgdatadir(void)
+{
+    static struct directory d = { NULL, @pkgdatadir@, "OVS_PKGDATADIR" };
+    return get_dir(&d);
+}
+
+const char *
+ovs_rundir(void)
+{
+    static struct directory d = { NULL, @RUNDIR@, "OVS_RUNDIR" };
+    return get_dir(&d);
+}
+
+const char *
+ovs_logdir(void)
+{
+    static struct directory d = { NULL, @LOGDIR@, "OVS_LOGDIR" };
+    return get_dir(&d);
+}
+
+const char *
+ovs_bindir(void)
+{
+    static struct directory d = { NULL, @bindir@, "OVS_BINDIR" };
+    return get_dir(&d);
+}