Tells if a file exists.
int file_exists(const char *
attrib, int *
Checks whether a file matching the given name and attributes (see
beginning of this chapter) exists. If `aret' is not NULL, it will be set
to the attributes of the matching file. Example:
/* Check for a normal file. */
if (file_exists("franken.dat", 0, NULL))
allegro_message("It is alive!\n");
Returns non-zero if the file exists, or zero if it doesn't or the
specified attributes mask it out.
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