Fix uuid on FreeBSD

In FreeBSD, just as in DARWIN, uuid functions are in libc and no external libuuid is required.
The API is quite different from Linux's though, so a different implementation of uuid () (util.cpp) is needed.

CMakeLists.txt

@@ -90,10 +90,10 @@ check_struct_has_member ("struct tm" tm_gmtoff time.h HAVE_TM_GMTOFF)
 check_struct_has_member ("struct stat" st_birthtime "sys/types.h;sys/stat.h" HAVE_ST_BIRTHTIME)
 
 message ("-- Looking for libuuid")
-if (DARWIN)
+if (DARWIN OR FREEBSD)
-  # Apple includes the uuid functions in their libc, rather than libuuid
+  # Apple and FreeBSD include the uuid functions in their libc, rather than libuuid
   check_function_exists (uuid_unparse_lower HAVE_UUID_UNPARSE_LOWER)
-else (DARWIN)
+else (DARWIN OR FREEBSD)
   find_path    (UUID_INCLUDE_DIR   uuid/uuid.h)
   find_library (UUID_LIBRARY NAMES uuid)
   if (UUID_INCLUDE_DIR AND UUID_LIBRARY)
@@ -106,7 +106,7 @@ else (DARWIN)
   else (UUID_INCLUDE_DIR AND UUID_LIBRARY)
     message (FATAL_ERROR "-- libuuid not found.")
   endif (UUID_INCLUDE_DIR AND UUID_LIBRARY)
-endif (DARWIN)
+endif (DARWIN OR FREEBSD)
 
 if (HAVE_UUID_UNPARSE_LOWER)
   message ("-- Found libuuid")

src/util.cpp

@@ -229,6 +229,28 @@ int autoComplete (
   return matches.size ();
 }
 
+// Handle the generation of UUIDs on FreeBSD in a separate implementation
+// of the uuid () function, since the API is quite different from Linux's.
+// Also, uuid_unparse_lower is not needed on FreeBSD, because the string
+// representation is always lowercase anyway.
+// For the implementation details, refer to
+// http://svnweb.freebsd.org/base/head/sys/kern/kern_uuid.c
+#ifdef __FreeBSD__
+const std::string uuid ()
+{
+    uuid_t id;
+    uint32_t status;
+    char *buffer (0);
+    uuid_create (&id, &status);
+    uuid_to_string (&id, &buffer, &status);
+
+    std::string res (buffer);
+    free (buffer);
+
+    return res;
+}
+#else
+
 ////////////////////////////////////////////////////////////////////////////////
 #ifndef HAVE_UUID_UNPARSE_LOWER
 // Older versions of libuuid don't have uuid_unparse_lower(), only uuid_unparse()
@@ -253,6 +275,7 @@ const std::string uuid ()
 
   return std::string (buffer);
 }
+#endif
 
 ////////////////////////////////////////////////////////////////////////////////
 // On Solaris no flock function exists.

src/util.h

@@ -32,7 +32,11 @@
 #include <vector>
 #include <map>
 #include <sys/types.h>
+#ifdef __FreeBSD__
+#include <uuid.h>
+#else
 #include <uuid/uuid.h>
+#endif
 #include <Task.h>
 
 // util.cpp