Sets the configuration file.


void set_config_file(const char *filename);
Sets the configuration file to be used by all subsequent config functions. If you don't call this function, Allegro will use the default `allegro.cfg' file, looking first in the same directory as your program and then in the directory pointed to by the ALLEGRO environment variable and the usual platform-specific paths for configuration files. For example it will look for `/etc/allegro.cfg' under Unix.

All pointers returned by previous calls to get_config_string() and other related functions are invalidated when you call this function! You can call this function before install_allegro() to change the configuration file, but after set_uformat() if you want to use a text encoding format other than the default.
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