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Fix text_substr bug intrduced in 7.3 development

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using Joe Conway's patches (submitted at pgsql-patches on 2002/04/08)
 + small fix.
This commit is contained in:
Tatsuo Ishii 2002-04-15 07:54:37 +00:00
parent 3767970cbf
commit c4e0c113b8
1 changed files with 9 additions and 3 deletions
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12
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 1.82 2002/04/03 05:39:32 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.83 2002/04/15 07:54:37 ishii Exp $
*
*-------------------------------------------------------------------------
*/
@ -373,7 +373,10 @@ text_substr(PG_FUNCTION_ARGS)
if (eml > 1)
{
sm = 0;
sn = (m + n) * eml + 3; /* +3 to avoid mb characters overhanging slice end */
if (n > -1)
sn = (m + n) * eml + 3; /* +3 to avoid mb characters overhanging slice end */
else
sn = n; /* n < 0 is special-cased by heap_tuple_untoast_attr_slice */
}
#endif
@ -387,7 +390,10 @@ text_substr(PG_FUNCTION_ARGS)
PG_RETURN_NULL(); /* notreached: suppress compiler warning */
#endif
#ifdef MULTIBYTE
len = pg_mbstrlen_with_len (VARDATA (string), sn - 3);
if (n > -1)
len = pg_mbstrlen_with_len (VARDATA (string), sn - 3);
else /* n < 0 is special-cased; need full string length */
len = pg_mbstrlen_with_len (VARDATA (string), VARSIZE(string)-VARHDRSZ);
if (m > len)
{