FIX static timeGetTime, make it similar to linux port (#358)

ports/bsd/bip-init.c

@@ -42,10 +42,7 @@
 #include "bacnet/basic/bbmd/h_bbmd.h"
 #include "bacport.h"
 
-/**
- * @file
- * @brief Initializes BACnet/IP interface (BSD/MAC OS X).
- */
+/** @file bsd/bip-init.c @brief Initializes BACnet/IP interface (BSD/MAC OS X). */
 
 /* unix sockets */
 static int BIP_Socket = -1;
@@ -63,6 +60,8 @@ static struct in_addr BIP_Address;
 static struct in_addr BIP_Broadcast_Addr;
 /* enable debugging */
 static bool BIP_Debug = false;
+/* interface name */
+static char BIP_Interface_Name[IF_NAMESIZE] = { 0 };
 
 /**
  * @brief Print the IPv4 address with debug info
@@ -475,6 +474,19 @@ static void *get_addr_ptr(struct sockaddr *sockaddr_ptr)
     return addr_ptr;
 }
 
+/**
+ * @brief Get the default interface name using routing info
+ * @return interface name, or NULL if not found or none
+*/
+static char *ifname_default(void)
+{
+    if (BIP_Interface_Name[0] != 0) {
+        return BIP_Interface_Name;
+    }
+    strncpy(BIP_Interface_Name, "en0", sizeof(BIP_Interface_Name));
+    return BIP_Interface_Name;
+}
+
 /** Gets the local IP address and local broadcast address from the system,
  *  and saves it into the BACnet/IP data structures.
  *
@@ -638,17 +650,22 @@ bool bip_init(char *ifname)
     int sock_fd = -1;
 
     if (ifname) {
+        strncpy(BIP_Interface_Name, ifname, sizeof(BIP_Interface_Name));
         bip_set_interface(ifname);
-        printf("interface %s", ifname);
     } else {
-        bip_set_interface("en0");
+        bip_set_interface(ifname_default());
+    }
+    if (BIP_Address.s_addr == 0) {
+        fprintf(stderr, "BIP: Failed to get an IP address from %s!\n",
+            BIP_Interface_Name);
+        fflush(stderr);
+        return false;
     }
 
     sin.sin_family = AF_INET;
     sin.sin_port = BIP_Port;
     memset(&(sin.sin_zero), '\0', sizeof(sin.sin_zero));
 
-
     sin.sin_addr.s_addr = BIP_Address.s_addr;
     sock_fd = createSocket(&sin);
     BIP_Socket = sock_fd;
@@ -682,7 +699,6 @@ bool bip_valid(void)
  */
 void bip_cleanup(void)
 {
-
     if (BIP_Socket != -1) {
         close(BIP_Socket);
     }