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Fix text_position to not scan past end of source string in multibyte

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case, per report from Korea PostgreSQL Users' Group. Copied from Tom
Lane's 7.4 branch patch.
This commit is contained in:
Joe Conway
2004-02-01 04:05:13 +00:00
parent 1b25db6a3c
commit b59917f02e
1 changed files with 7 additions and 4 deletions
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11
src/backend/utils/adt/varlena.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.92.2.2 2003/11/30 20:52:37 joe Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.92.2.3 2004/02/01 04:05:13 joe Exp $
*
*-------------------------------------------------------------------------
*/
@@ -665,9 +665,6 @@ text_position(Datum str, Datum search_str, int matchnum)
len1 = (VARSIZE(t1) - VARHDRSZ);
len2 = (VARSIZE(t2) - VARHDRSZ);
/* no use in searching str past point where search_str will fit */
px = (len1 - len2);
if (eml == 1) /* simple case - single byte encoding */
{
char *p1,
@@ -676,6 +673,9 @@ text_position(Datum str, Datum search_str, int matchnum)
p1 = VARDATA(t1);
p2 = VARDATA(t2);
/* no use in searching str past point where search_str will fit */
px = (len1 - len2);
for (p = 0; p <= px; p++)
{
if ((*p2 == *p1) && (strncmp(p1, p2, len2) == 0))
@@ -703,6 +703,9 @@ text_position(Datum str, Datum search_str, int matchnum)
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t2), p2, len2);
len2 = pg_wchar_strlen(p2);
/* no use in searching str past point where search_str will fit */
px = (len1 - len2);
for (p = 0; p <= px; p++)
{
if ((*p2 == *p1) && (pg_wchar_strncmp(p1, p2, len2) == 0))