- FUNC(XpmReadFileToBuffer, int, (char *filename, char **buffer_return));
- FUNC(XpmWriteFileFromBuffer, int, (char *filename, char *buffer));
+ FUNC(XpmReadFileToBuffer, int, (const char *filename, char **buffer_return));
+ FUNC(XpmWriteFileFromBuffer, int, (const char *filename, char *buffer));