Add support for UUID generation

1 files changed, 88 insertions, 0 deletions

diff --git a/libbutl/uuid.cxx b/libbutl/uuid.cxx
new file mode 100644
index 0000000..ab42ad8
--- /dev/null
+++ b/libbutl/uuid.cxx
@@ -0,0 +1,88 @@
+// file      : libbutl/uuid.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbutl/uuid.hxx>
+
+#include <errno.h> // ENOTSUP
+
+#include <cstdio>       // sprintf() scanf()
+#include <cstring>      // strlen()
+#include <stdexcept>
+#include <system_error>
+
+using namespace std;
+
+namespace butl
+{
+  array<char, 37> uuid::
+  c_string (bool upper) const
+  {
+    array<char, 37> r;
+
+    sprintf (r.data (),
+             (upper
+              ? "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X"
+              : "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x"),
+             time_low,
+             time_mid,
+             time_hiv,
+             clock_seq_hir,
+             clock_seq_low,
+             node[0], node[1], node[2], node[3], node[4], node[5]);
+
+    return r;
+  }
+
+  void uuid::
+  assign (const char* s)
+  {
+    if (s != nullptr && strlen (s) == 36 && s[8] == '-')
+    {
+      if (sscanf (s,
+                  "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
+                  &time_low,
+                  &time_mid,
+                  &time_hiv,
+                  &clock_seq_hir,
+                  &clock_seq_low,
+                  &node[0], &node[1], &node[2],
+                  &node[3], &node[4], &node[5]) == 11)
+        return;
+    }
+
+    throw invalid_argument ("invalid UUID string representation");
+  }
+
+  uuid_system_generator uuid::system_generator;
+
+  // Utility function used by platform-specified uuid-*.cxx implementations.
+  //
+  void
+  uuid_throw_weak ()
+  {
+    throw system_error (ENOTSUP,
+                        generic_category (),
+                        "strong UUID uniqueness cannot be guaranteed");
+  }
+
+#ifdef BUILD2_BOOTSTRAP
+  uuid uuid_system_generator::
+  generate (bool)
+  {
+    throw system_error (ENOTSUP,
+                        generic_category (),
+                        "no UUID generation support during bootstrap");
+  }
+
+  void uuid_system_generator::
+  initialize ()
+  {
+  }
+
+  void uuid_system_generator::
+  terminate ()
+  {
+  }
+#endif // BUILD2_BOOTSTRAP
+}