dev-map: map device number to small non-negative

* gl/lib/dev-map.c: New file.
* gl/lib/dev-map.h: Declarations.
* gl/modules/dev-map: Define primary modules.
* gl/modules/dev-map-tests: Define test module.
* gl/tests/test-dev-map.c: Test it.

1 files changed, 63 insertions, 0 deletions

diff --git a/gl/tests/test-dev-map.c b/gl/tests/test-dev-map.c
new file mode 100644
index 000000000..98ba6301b
--- /dev/null
+++ b/gl/tests/test-dev-map.c
@@ -0,0 +1,63 @@
+/* Test the dev-map module.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering.  */
+
+#include <config.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+/* FIXME: once/if in gnulib, use #include "macros.h" in place of this */
+#define ASSERT(expr) \
+  do                                                                         \
+    {                                                                        \
+      if (!(expr))                                                           \
+        {                                                                    \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);                                                   \
+          abort ();                                                          \
+        }                                                                    \
+    }                                                                        \
+  while (0)
+
+#include "dev-map.h"
+
+/* Risky: this is also defined in di-set.c; they should match.  */
+#define N_DEV_BITS_4 5
+
+int
+main ()
+{
+  /* set_program_name (argv[0]); placate overzealous "syntax-check" test.  */
+  struct dev_map dev_map;
+  ASSERT (dev_map_init (&dev_map) == 0);
+
+  ASSERT (dev_map_insert (&dev_map, 42) == 0);
+  ASSERT (dev_map_insert (&dev_map, 42) == 0);
+  ASSERT (dev_map_insert (&dev_map, 398) == 1);
+  ASSERT (dev_map_insert (&dev_map, 398) == 1);
+
+  int32_t i;
+  for (i = 0; i < (1 << N_DEV_BITS_4); i++)
+    {
+      ASSERT (dev_map_insert (&dev_map, 10000+i) == 2+i);
+    }
+
+  dev_map_free (&dev_map);
+
+  return 0;
+}