file_exists - Tells if a file exists. Allegro game programming library.
#include <allegro.h>
int file_exists(const char *filename, int attrib, int
*aret);
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.
exists(3), file_size_ex(3), file_time(3)