Add cdio_dirname which I think should complete what we need. Also add test of abs_path and dirname

test/driver/abs_path.c

@@ -0,0 +1,46 @@
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+# define __CDIO_CONFIG_H__ 1
+#endif
+
+#ifdef HAVE_STDIO_H
+#include <stdio.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+extern char * cdio_abspath(const char *cwd, const char *fname);
+const char * cdio_dirname(const char *fname);
+
+int
+main(int argc, const char *argv[])
+{
+    const char *cue_filename[] = {
+	"/tmp/foo.bar",
+	"foo.bar"
+    };
+    const char *expect[] = {
+	"/tmp/baz",
+	"./baz"
+    };
+
+  int rc=0;
+  char *dest;
+  int i;
+
+  for (i=0; i<2; i++) {
+      const char *dirname = cdio_dirname(cue_filename[i]);
+      dest = cdio_abspath (dirname, "baz");
+      if (0 != strcmp(expect[i], dest)) {
+	  fprintf(stderr, 
+		  "Incorrect: expecting %s, got %s.\n",
+		  expect[i], dest);
+	  rc=i+1;
+      }
+  }
+  exit(rc);
+}