diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/utils/adt/varlena.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c index 0cd38a76bee..2007e78910f 100644 --- a/src/backend/utils/adt/varlena.c +++ b/src/backend/utils/adt/varlena.c @@ -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) { |