Makes few cleanning and adds an obi_dms C constructor

src/obidms.c

@@ -7,6 +7,14 @@
 
 #include <obidms.h>
 
+
+/***********************************************************************
+ *
+ * D E C L A R A T I O N   O F   T H E  P R I V A T E   F U N C T I O N S
+ *
+ ***********************************************************************/
+
+
 /**
  * Internal function building the directory name from a OBIDMS name.
  *
@@ -50,6 +58,33 @@ static char *build_directory_name(const char *name) {
 	return dirdbname;
 }
 
+/***********************************************************************
+ *
+ * D E F I N I T I O N   O F   T H E  P R I V A T E   F U N C T I O N S
+ *
+ ***********************************************************************/
+
+int obi_dms_exists(const char* name) {
+    struct stat buffer;
+	char *dirdbname;
+    int exist;
+
+	// Build and check the directory name
+	dirdbname = build_directory_name(name);
+	if (dirdbname==NULL)
+		return -1;
+
+	exist = stat(dirdbname,&buffer);
+
+	free(dirdbname);
+
+    if(exist == 0)
+        return 1;
+    else // -1
+        return 0;
+}
+
+
 OBIDMS_p obi_create_dms(const char *name) {
 	char *dirdbname;
 
@@ -127,6 +162,20 @@ OBIDMS_p obi_open_dms(const char *name) {
 	return dms;
 }
 
+OBIDMS_p obi_dms(const char *name) {
+	int exist = obi_dms_exists(name);
+
+	switch (exist) {
+		case 0:
+			return obi_create_dms(name);
+		case 1:
+			return obi_open_dms(name);
+	};
+
+	return NULL;
+
+}
+
 
 int obi_close_dms(OBIDMS_p dms) {