for_each_file_ex − Executes callback() for each file matching a wildcard. Allegro game programming library.
int for_each_file_ex(const char *name, int in_attrib, int out_attrib, int (*callback)(const char *filename, int attrib, void *param), void *param);
Finds all the files on disk which match the given wildcard specification and file attributes, and executes callback() once for each. Basically, this is a convenient wrapper around al_findfirst(), al_findnext() and al_findclose(). ‘in_attrib’ is a bitmask specifying the attributes the files must carry, ‘out_attrib’ is a bitmask specifying the attributes the files must not carry; attributes which are not specified in either bitmasks are not taken into account for deciding whether callback() is invoked or not.
The callback function will be passed three arguments: the first is a string which contains the completed filename (exactly the same string you passed to for_each_file_ex() but with meta characters), the second is the actual attributes of the file, and the third is a void pointer which is simply a copy of ‘param’ (you can use this for whatever you like). The callback must return zero to let the enumeration proceed, or any non-zero value to stop it. If an error occurs, the error code will be stored in ‘errno’ but the enumeration won’t stop. Example:
int show_name(const char *filename, int attrib, void *param)
allegro_message("Caught ‘%s’, attribs %d\n",
count = for_each_file_ex("data/level*", FA_DIREC,
0, show_name, 0);
allegro_message("%d game directories\n", count);
Returns the number of successful calls made to callback(), that is, the number of times callback() was called and returned 0.