[Development] os: introduce new function called "fileexists"

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4255 3789f03b-4d11-0410-bbf8-ca57d06f2519

common/os/os.cxx

@@ -85,3 +85,13 @@ int getvnchomedir(char **dirp)
 	return 0;
 }
 
+int fileexists(char *file)
+{
+#ifdef WIN32
+  return (GetFileAttributes(file) == INVALID_FILE_ATTRIBUTES) ? -1 : 0;
+#else
+  return access(file, R_OK);
+#endif
+}
+
+

common/os/os.h

@@ -37,4 +37,13 @@
  */
 int getvnchomedir(char **dirp);
 
+/*
+ * Check if the file exists
+ *
+ * Returns:
+ * 0 - Success
+ * -1 - Failure
+ */
+int fileexists(char *file);
+
 #endif /* OS_OS_H */