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Miscellaneous
Which demonstrate (a) opening a file in the root directory of a specified volume; (b)
opening a file in the root directory on a default volume; (c) opening a file in a non-root
directory; (d) opening the root directory of a specified volume; (e) opening the root
directory of the default volume; (f) opening a non-root directory.
Relative paths can be used if working directories are enabled ( FS_CFG_WORKING_DIR_EN is
DEF_ENABLED ; see Appendix E, “FS_CFG_WORKING_DIR_EN” on page 529). A relative
path begins with neither a volume name nor a ‘ ’:
<... Relative Path ...><File>
where
<... Relative Path ...>
is the file path, which must not begin with a ‘ ’ but
must end with a ‘ ’.
<File>
is the file (or leaf directory) name, including any
extension.
Two special path components can be used. “ .. ” moves the path to the parent directory. “ . ”
keeps the path in the same directory (basically, it does nothing).
A relative path is appended to the current working directory of the calling task to form the
absolute path of the file or directory. The working directory functions, fs_chdir() and
fs_getcwd() , can be used to set and get the working directory.
4-4 μC/FS NAME LENGTHS
The configuration constants FS_CFG_MAX_PATH_NAME_LEN , FS_CFG_MAX_FILE_NAME_LEN
and FS_CFG_MAX_VOL_NAME_LEN in fs_cfg.h set the maximum length of path names, file
names and volume names. The constant FS_CFG_MAX_FULL_NAME_LEN is defined in
fs_cfg_fs.h to describe the maximum full name length. The path name begins with a path
separator character and includes the file name; the file name is just the portion of the path
name after the last (non-final) path separator character. The full name is composed of an
explicit volume name (optionally) and a path name; the maximum full name length may be
calculated:
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