File_Visit_Info

What visit_files reports about one directory entry, and what add_modtime_and_size_if_missing fills in.

• short_name is the entry's name and full_name the directory given to visit_files joined with it (with /). Both are valid only during the callback; copy them to keep them.
• modification_time and size are those of the file itself (of the target, for a link). modification_time is APOLLO_TIME_INVALID when unknown.
• is_directory and is_symlink say what it is. A link to a directory has both set.
• had_error is set when the entry's details could not be read.
• descend_into_directory is true for a directory the walk will enter. A callback that sets it to false skips that directory's contents.

A zero File_Visit_Info has empty names, size 0 and every flag false.

info: File_Visit_Info;
assert(info.short_name.count == 0 && info.size == 0);
assert(!info.had_error && !info.is_symlink && !info.is_directory && !info.descend_into_directory);