cvs commit: src/sys/fs/msdosfs msdosfs_conv.c

[R. Imura]

imura       2005-07-17 07:10:05 UTC

  FreeBSD src repository

  Modified files:
    sys/fs/msdosfs       msdosfs_conv.c 
  Log:
  [1] unix2doschr()
   If a character cannot be converted to DOS code page,
   unix2doschr() returned `0'. As a result, unix2dosfn()
   was forced to return `0', so we saw a file which was
   composed of these characters as `Invalid argument'.
   To correct this, if a character can be converted to
   Unicode, unix2doschr() now returns `1' which is a magic
   number to make unix2dosfn() know that the character
   must be converted to `_'.
  
  [2] unix2dosfn()
   The above-mentioned solution only works if a file
   has both of Unicode name and DOS code page name.
   Unicode name would not be recorded if file name
   can be settled within 11 bytes (DOS short name)
   and if no conversion from Unix charset to DOS code
   page has occurred. Thus, FreeBSD can create a file
   which has only short name, but there is no guarantee
   that the short name contains allways valid characters
   because we leave it to people by using mount_msdosfs(8)
   to select which conversion is used between DOS code
   page and unix charset.
   To avoid this, Unicode file name should be recorded
   unless a character is an ascii character. This is
   the way Windows XP do.
  
  PR:             77074 [1]
  MFC after:      1 week
  
  Revision  Changes    Path
  1.45      +27 -10    src/sys/fs/msdosfs/msdosfs_conv.c