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Fix (I think) broken usage of MultiByteToWideChar. I had missed the

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subtlety that this function only returns a null terminator if it's
fed input that includes one; which, in the usage here, it's not.
This probably fixes bugs reported by Thomas Haegi.
This commit is contained in:
Tom Lane 2007-11-24 21:20:07 +00:00
parent 0f20e7a83e
commit ae3ff7adf7
1 changed files with 20 additions and 13 deletions
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33
src/backend/tsearch/ts_locale.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tsearch/ts_locale.c,v 1.4 2007/11/15 21:14:38 momjian Exp $
* $PostgreSQL: pgsql/src/backend/tsearch/ts_locale.c,v 1.5 2007/11/24 21:20:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -23,7 +23,7 @@
* wchar2char --- convert wide characters to multibyte format
*
* This has the same API as the standard wcstombs() function; in particular,
* tolen is the maximum number of bytes to store at *to, and *from should be
* tolen is the maximum number of bytes to store at *to, and *from must be
* zero-terminated. The output will be zero-terminated iff there is room.
*/
size_t
@ -73,21 +73,28 @@ char2wchar(wchar_t *to, size_t tolen, const char *from, size_t fromlen)
{
int r;
r = MultiByteToWideChar(CP_UTF8, 0, from, fromlen, to, tolen);
if (r <= 0)
/* stupid Microsloth API does not work for zero-length input */
if (fromlen == 0)
r = 0;
else
{
pg_verifymbstr(from, fromlen, false);
ereport(ERROR,
(errcode(ERRCODE_CHARACTER_NOT_IN_REPERTOIRE),
errmsg("invalid multibyte character for locale"),
errhint("The server's LC_CTYPE locale is probably incompatible with the database encoding.")));
r = MultiByteToWideChar(CP_UTF8, 0, from, fromlen, to, tolen - 1);
if (r <= 0)
{
/* see notes in oracle_compat.c about error reporting */
pg_verifymbstr(from, fromlen, false);
ereport(ERROR,
(errcode(ERRCODE_CHARACTER_NOT_IN_REPERTOIRE),
errmsg("invalid multibyte character for locale"),
errhint("The server's LC_CTYPE locale is probably incompatible with the database encoding.")));
}
}
Assert(r <= tolen);
Assert(r < tolen);
to[r] = 0;
/* Microsoft counts the zero terminator in the result */
return r - 1;
return r;
}
#endif /* WIN32 */