add globbing util function

experimental/skpdiff/skpdiff_util.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <time.h>
 #include <dirent.h>
+#include <glob.h>
 #include "SkOSFile.h"
 #include "skpdiff_util.h"
 
 const char* cl_error_to_string(cl_int err) {
     switch (err) {
         case CL_SUCCESS:                         return "CL_SUCCESS";
         case CL_DEVICE_NOT_FOUND:                return "CL_DEVICE_NOT_FOUND";
         case CL_DEVICE_NOT_AVAILABLE:            return "CL_DEVICE_NOT_AVAILABLE";
         case CL_COMPILER_NOT_AVAILABLE:          return "CL_COMPILER_NOT_AVAILABLE";
         case CL_MEM_OBJECT_ALLOCATION_FAILURE:   return "CL_MEM_OBJECT_ALLOCATION_FAILURE";
@@ skipping 63 matching lines @@
         // dirent only gives relative paths, we need to join them to the base path to check if they
         // are directories.
         SkString joinedPath = SkOSPath::SkPathJoin(path, entry->d_name);
 
         // We only care about files
         if (!sk_isdir(joinedPath.c_str())) {
             entries->push_back(SkString(entry->d_name));
         }
     }
 
+    closedir(dir);
+
     return true;
 }
+
+bool glob_files(const char globPattern[], SkTArray<SkString>* entries) {
+    // TODO Make sure this works on windows. This may require use of FindNextFile windows function.
+    glob_t globBuffer;
+    if (glob(globPattern, 0, NULL, &globBuffer) != 0) {
+        return false;
+    }
+
+    // Note these paths are in sorted order by default according to http://linux.die.net/man/3/glob
+    // Check under the flag GLOB_NOSORT
+    char** paths = globBuffer.gl_pathv;
+    while(NULL != *paths) {
+        entries->push_back(SkString(*paths));
+        paths++;
+    }
+
+    globfree(&globBuffer);
+
+    return true;
+}