al_mouse_button_down - Man Page

#include <allegro5/allegro.h>

bool al_mouse_button_down(const ALLEGRO_MOUSE_STATE *state, int button)

Return true if the mouse button specified was held down in the state specified. Unlike most things, the first mouse button is numbered 1.

ALLEGRO_MOUSE_STATE(3), al_get_mouse_state(3), al_get_mouse_state_axis(3)

al_get_mouse_state(3), al_get_mouse_state_axis(3), ALLEGRO_MOUSE_STATE(3).