From d5cedc6f28a60301bad21a16fdb047fdb82ff883 Mon Sep 17 00:00:00 2001
From: rsiddharth <s@ricketyspace.net>
Date: Thu, 9 Apr 2020 20:37:12 -0400
Subject: 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
---
 nserver/.gitignore       |  1 +
 nserver/Makefile         |  5 +++--
 nserver/src/db.c         | 20 ++++++++++++++++++++
 nserver/src/db.h         | 11 +++++++++++
 nserver/tests/db_tests.c | 21 +++++++++++++++++++++
 5 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 nserver/src/db.c
 create mode 100644 nserver/src/db.h
 create mode 100644 nserver/tests/db_tests.c

diff --git a/nserver/.gitignore b/nserver/.gitignore
index 7a18cd1..7a6be0c 100644
--- a/nserver/.gitignore
+++ b/nserver/.gitignore
@@ -1 +1,2 @@
 tests/*_tests
+nserver.db
\ No newline at end of file
diff --git a/nserver/Makefile b/nserver/Makefile
index 5c6bc9c..3ecfd8d 100644
--- a/nserver/Makefile
+++ b/nserver/Makefile
@@ -28,7 +28,7 @@ $(TARGET): build $(OBJECTS)
 $(SO_TARGET): $(TARGET) $(OBJECTS)
 	$(CC) -shared -o $@ $(OBJECTS)
 
-$(PROGRAMS): LDLIBS += $(TARGET) -lm
+$(PROGRAMS): LDLIBS += $(TARGET) -lm -L/usr/local/lib -lgdbm
 
 build:
 	@mkdir -p build
@@ -36,7 +36,7 @@ build:
 
 # The Unit Tests
 .PHONY: tests
-tests: LDLIBS += $(TARGET) -lm
+tests: LDLIBS += $(TARGET) -lm -L/usr/local/lib -lgdbm
 tests: $(TESTS)
 	sh ./tests/runtests.sh
 
@@ -46,6 +46,7 @@ clean:
 	rm -f tests/tests.log
 	find . -name "*.gc" -exec rm {} \;
 	rm -rf `find . -name "*.dSYM" -print`
+	rm -rf nserver.db
 
 # The Install
 install: all
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;
+}
diff --git a/nserver/src/db.h b/nserver/src/db.h
new file mode 100644
index 0000000..433f812
--- /dev/null
+++ b/nserver/src/db.h
@@ -0,0 +1,11 @@
+#ifndef _db_h
+#define _db_h
+
+#include <gdbm.h>
+#include <dbg.h>
+#include <sys/stat.h>
+
+int db_init();
+
+#endif
+
diff --git a/nserver/tests/db_tests.c b/nserver/tests/db_tests.c
new file mode 100644
index 0000000..f97f114
--- /dev/null
+++ b/nserver/tests/db_tests.c
@@ -0,0 +1,21 @@
+#include "minunit.h"
+#include <db.h>
+
+char *test_db_init()
+{
+    int rc = db_init();
+    mu_assert(rc == 0, "db init failed");
+
+    return NULL;
+}
+
+char *all_tests()
+{
+    mu_suite_start();
+
+    mu_run_test(test_db_init);
+
+    return NULL;
+}
+
+RUN_TESTS(all_tests);
-- 
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