man allegro_error () - Stores the last Allegro error message.
NAME
allegro_error - Stores the last Allegro error message.
SYNOPSIS
#include <allegro.h>
extern char allegro_error[ALLEGRO_ERROR_SIZE];
DESCRIPTION
Text string used by set_gfx_mode(), install_sound() and other functions to report error messages. If they fail and you want to tell the user why, this is the place to look for a description of the problem. Example:
void abort_on_error(const char *message)
{
if (screen != NULL)
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("%s.\nLast Allegro error `%s'\n",
message, allegro_error);
exit(-1);
}
...
if (some_allegro_function() == ERROR_CODE)
abort_on_error("Error calling some function!");