al_set_config_value - Allegro 5 API
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#include <allegro5/allegro.h>
void al_set_config_value(ALLEGRO_CONFIG *config,
const char *section, const char *key, const char *value)
Set a value in a section of a configuration. If the section doesn’t yet
exist, it will be created. If a value already existed for the given key, it
will be overwritten. The section can be NULL or “” for the
global section.
For consistency with the on-disk format of config files, any
leading and trailing whitespace will be stripped from the value. If you have
significant whitespace you wish to preserve, you should add your own quote
characters and remove them when reading the values back in.