nserver: Add db.h

* nserver/.gitignore: Add nserver.db
* nserver/Makefile ($(PROGRAMS))
(tests): Link gdbm.
(clean): Remove nserver.db
* nserver/src/db.c (db_init): New function.
* nserver/src/db.h (db_init): New function declaration.
* nserver/tests/db_tests.c: Tests for db.h

1 files changed, 20 insertions, 0 deletions

diff --git a/nserver/src/db.c b/nserver/src/db.c
new file mode 100644
index 0000000..315bf7b
--- /dev/null
+++ b/nserver/src/db.c
@@ -0,0 +1,20 @@
+#include <db.h>
+
+
+static const char *DB_FILE = "nserver.db";
+
+int db_init()
+{
+    // Create DB if it's not already created.
+    GDBM_FILE  gf = gdbm_open(DB_FILE, 0, GDBM_WRCREAT,
+                              S_IRUSR|S_IWUSR, NULL);
+    check(gf != NULL, "unable to init db");
+
+    // Close the DB.
+    int rc = gdbm_close(gf);
+    check(rc == 0,  "error closing db after init");
+
+    return 0;
+ error:
+    return -1;
+}