Miscellaneous
FullNameLenmax = VolNameLenmax + PathNameLenmax
Figure 2-3 demonstrates these definitions.
full name
path name
myvolume:\MyDir0\MyDir1\MyDir2\my_very_very_long_?le_name.txt
parent name
?le name
volume name
Figure 4-1 File, path and volume name lengths
No maximum parent name length is defined, though one may be derived. The parent name
must be short enough so that the path of a file in the directory would be valid. Strictly, the
minimum file name length is 1 character, though some OSs may enforce larger values
(eleven on some Windows systems), thereby decreasing the maximum parent name length.
ParentNameLenmax = PathNameLenmax - FileNameLenmin - 1
The configuration constants
FS_CFG_MAX_DEV_DRV_NAME_LEN
and
FS_CFG_MAX_DEV_NAME_LEN in fs_cfg.h set the maximum length of device driver names
and device names, as shown in Figure 2-4. The device name is between three and five
characters longer than the device driver name, since the unit number (the integer between
the colons of the device name) must be between 0 and 255.
device name
sdcard:0:
device driver name
Figure 4-2 Device and device driver name lengths
Each of the maximum name length configurations specifies the maximum string length
without the NULL character. Consequently, a buffer which holds one of these names must be
one character longer than the define value.
64
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