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cifs: clean up various nits in unicode routines (try #2)

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Minor revision to the original patch. Don't abuse the __le16 variable
on the stack by casting it to wchar_t and handing it off to char2uni.
Declare an actual wchar_t on the stack instead. This fixes a valid
sparse warning.

Fix the spelling of UNI_ASTERISK. Eliminate the unneeded len_remaining
variable in cifsConvertToUCS.

Also, as David Howells points out. We were better off making
cifsConvertToUCS *not* use put_unaligned_le16 since it means that we
can't optimize the mapped characters at compile time. Switch them
instead to use cpu_to_le16, and simply use put_unaligned to set them
in the string.

Reported-and-acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2011-04-05 15:02:37 -04:00 • committed by Steve French
commit 581ade4d1c
2 changed files with 18 additions and 19 deletions
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35
fs/cifs/cifs_unicode.c
View file

@ -90,7 +90,7 @@ cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
case UNI_COLON:
*target = ':';
break;
case UNI_ASTERIK:
case UNI_ASTERISK:
*target = '*';
break;
case UNI_QUESTION:
@ -264,40 +264,40 @@ cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode,
* names are little endian 16 bit Unicode on the wire
*/
int
cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
cifsConvertToUCS(__le16 *target, const char *source, int srclen,
const struct nls_table *cp, int mapChars)
{
int i, j, charlen;
int len_remaining = maxlen;
char src_char;
__u16 temp;
__le16 dst_char;
wchar_t tmp;
if (!mapChars)
return cifs_strtoUCS(target, source, PATH_MAX, cp);
for (i = 0, j = 0; i < maxlen; j++) {
for (i = 0, j = 0; i < srclen; j++) {
src_char = source[i];
switch (src_char) {
case 0:
put_unaligned_le16(0, &target[j]);
put_unaligned(0, &target[j]);
goto ctoUCS_out;
case ':':
temp = UNI_COLON;
dst_char = cpu_to_le16(UNI_COLON);
break;
case '*':
temp = UNI_ASTERIK;
dst_char = cpu_to_le16(UNI_ASTERISK);
break;
case '?':
temp = UNI_QUESTION;
dst_char = cpu_to_le16(UNI_QUESTION);
break;
case '<':
temp = UNI_LESSTHAN;
dst_char = cpu_to_le16(UNI_LESSTHAN);
break;
case '>':
temp = UNI_GRTRTHAN;
dst_char = cpu_to_le16(UNI_GRTRTHAN);
break;
case '|':
temp = UNI_PIPE;
dst_char = cpu_to_le16(UNI_PIPE);
break;
/*
* FIXME: We can not handle remapping backslash (UNI_SLASH)
@ -305,17 +305,17 @@ cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
* as they use backslash as separator.
*/
default:
charlen = cp->char2uni(source+i, len_remaining,
&temp);
charlen = cp->char2uni(source + i, srclen - i, &tmp);
dst_char = cpu_to_le16(tmp);
/*
* if no match, use question mark, which at least in
* some cases serves as wild card
*/
if (charlen < 1) {
temp = 0x003f;
dst_char = cpu_to_le16(0x003f);
charlen = 1;
}
len_remaining -= charlen;
/*
* character may take more than one byte in the source
* string, but will take exactly two bytes in the
@ -324,9 +324,8 @@ cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
i += charlen;
continue;
}
put_unaligned_le16(temp, &target[j]);
put_unaligned(dst_char, &target[j]);
i++; /* move to next char in source string */
len_remaining--;
}
ctoUCS_out:

2
fs/cifs/cifs_unicode.h
View file

@ -44,7 +44,7 @@
* reserved symbols (along with \ and /), otherwise illegal to store
* in filenames in NTFS
*/
#define UNI_ASTERIK (__u16) ('*' + 0xF000)
#define UNI_ASTERISK (__u16) ('*' + 0xF000)
#define UNI_QUESTION (__u16) ('?' + 0xF000)
#define UNI_COLON (__u16) (':' + 0xF000)
#define UNI_GRTRTHAN (__u16) ('>' + 0xF000)