/***** Formats an MS-DOS file name. Rejects invalid names. */
static int msdos_format_name(const unsigned char *name, int len,
unsigned char *res, struct fat_mount_options *opts)
/*
* name is the proposed name, len is its length, res is
* the resulting name, opts->name_check is either (r)elaxed,
* (n)ormal or (s)trict, opts->dotsOK allows dots at the
* beginning of name (for hidden files)
*/
{
unsigned char *walk;
unsigned char c;
int space;
if (name[0] == '.') { /* dotfile because . and .. already done */
if (opts->dotsOK) {
/* Get rid of dot - test for it elsewhere */
name++;
len--;
} else if (!opts->atari)
return -EINVAL;
}
/*
* disallow names that _really_ start with a dot for MS-DOS,
* GEMDOS does not care
*/
space = !opts->atari;
c = 0;
for (walk = res; len && walk - res < 8; walk++) {
c = *name++;
len--;
if (opts->name_check != 'r' && strchr(bad_chars, c))
return -EINVAL;
if (opts->name_check == 's' && strchr(bad_if_strict(opts), c))
return -EINVAL;
if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
return -EINVAL;
if (c < ' ' || c == ':' || c == '\\')
return -EINVAL;
/*
* 0xE5 is legal as a first character, but we must substitute
* 0x05 because 0xE5 marks deleted files. Yes, DOS really
* does this.
* It seems that Microsoft hacked DOS to support non-US
* characters after the 0xE5 character was already in use to
* mark deleted files.
*/
if ((res == walk) && (c == 0xE5))
c = 0x05;
if (c == '.')
break;
space = (c == ' ');
*walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c;
}
if (space)
return -EINVAL;
if (opts->name_check == 's' && len && c != '.') {
c = *name++;
len--;
if (c != '.')
return -EINVAL;
}
while (c != '.' && len--)
c = *name++;
if (c == '.') {
while (walk - res < 8)
*walk++ = ' ';
while (len > 0 && walk - res < MSDOS_NAME) {
c = *name++;
len--;
if (opts->name_check != 'r' && strchr(bad_chars, c))
return -EINVAL;
if (opts->name_check == 's' &&
strchr(bad_if_strict(opts), c))
return -EINVAL;
if (c < ' ' || c == ':' || c == '\\')
return -EINVAL;
if (c == '.') {
if (opts->name_check == 's')
return -EINVAL;
break;
}
if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
return -EINVAL;
space = c == ' ';
if (!opts->nocase && c >= 'a' && c <= 'z')
*walk++ = c - 32;
else
*walk++ = c;
}
if (space)
return -EINVAL;
if (opts->name_check == 's' && len)
return -EINVAL;
}
while (walk - res < MSDOS_NAME)
*walk++ = ' ';
return 0;
}
/***** Formats an MS-DOS file name. Rejects invalid names. */
static int msdos_format_name(const char *name,int len,
char *res,struct fat_mount_options *opts)
/* conv is relaxed/normal/strict, name is proposed name,
* len is the length of the proposed name, res is the result name,
* dotsOK is if hidden files get dots.
*/
{
char *walk;
const char **reserved;
unsigned char c;
int space;
if (name[0] == '.') { /* dotfile because . and .. already done */
if (opts->dotsOK) {
/* Get rid of dot - test for it elsewhere */
name++; len--;
}
else if (!opts->atari) return -EINVAL;
}
/* disallow names that _really_ start with a dot for MS-DOS, GEMDOS does
* not care */
space = !opts->atari;
c = 0;
for (walk = res; len && walk-res < 8; walk++) {
c = *name++;
len--;
if (opts->conversion != 'r' && strchr(bad_chars,c))
return -EINVAL;
if (opts->conversion == 's' && strchr(bad_if_strict(opts),c))
return -EINVAL;
if (c >= 'A' && c <= 'Z' && opts->conversion == 's')
return -EINVAL;
if (c < ' ' || c == ':' || c == '\\') return -EINVAL;
/* 0xE5 is legal as a first character, but we must substitute 0x05 */
/* because 0xE5 marks deleted files. Yes, DOS really does this. */
/* It seems that Microsoft hacked DOS to support non-US characters */
/* after the 0xE5 character was already in use to mark deleted files. */
if((res==walk) && (c==0xE5)) c=0x05;
if (c == '.') break;
space = (c == ' ');
*walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c-32 : c;
}
if (space) return -EINVAL;
if (opts->conversion == 's' && len && c != '.') {
c = *name++;
len--;
if (c != '.') return -EINVAL;
}
while (c != '.' && len--) c = *name++;
if (c == '.') {
while (walk-res < 8) *walk++ = ' ';
while (len > 0 && walk-res < MSDOS_NAME) {
c = *name++;
len--;
if (opts->conversion != 'r' && strchr(bad_chars,c))
return -EINVAL;
if (opts->conversion == 's' &&
strchr(bad_if_strict(opts),c))
return -EINVAL;
if (c < ' ' || c == ':' || c == '\\')
return -EINVAL;
if (c == '.') {
if (opts->conversion == 's')
return -EINVAL;
break;
}
if (c >= 'A' && c <= 'Z' && opts->conversion == 's')
return -EINVAL;
space = c == ' ';
*walk++ = (!opts->nocase && c >= 'a' && c <= 'z') ? c-32 : c;
}
if (space) return -EINVAL;
if (opts->conversion == 's' && len) return -EINVAL;
}
while (walk-res < MSDOS_NAME) *walk++ = ' ';
if (!opts->atari)
/* GEMDOS is less stupid and has no reserved names */
for (reserved = reserved_names; *reserved; reserved++)
if (!strncmp(res,*reserved,8)) return -EINVAL;
return 0;
}