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Fixes:

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The updating of array fields is broken in Postgres95-1.01, An array can
be only replaced with a new array but not have some elements modified.
This is caused by two bugs in the parser and in the array utilities.
Furthermore it is not possible to update array with a base type of
variable length.


- submitted by: Massimo Dal Zotto <dz@cs.unitn.it>
This commit is contained in:
Marc G. Fournier
1996-07-20 07:59:41 +00:00
parent baeb3aadc5
commit 94215d51c8
4 changed files with 66 additions and 5 deletions
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47
src/backend/utils/adt/arrayfuncs.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.1.1.1 1996/07/09 06:22:03 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.2 1996/07/20 07:58:44 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -877,7 +877,11 @@ array_set(ArrayType *array,
* fixed length arrays -- these are assumed to be 1-d
*/
if (indx[0]*elmlen > arraylen)
#ifdef ARRAY_PATCH
elog(WARN, "array_ref: array bound exceeded");
#else
elog(WARN, "array_set: array bound exceeded");
#endif
pos = (char *)array + indx[0]*elmlen;
ArrayCastAndSet(dataPtr, (bool) reftype, elmlen, pos);
return((char *)array);
@ -888,7 +892,14 @@ array_set(ArrayType *array,
nbytes = (* (int32 *) array) - ARR_OVERHEAD(ndim);
if (!SanityCheckInput(ndim, n, dim, lb, indx))
#ifdef ARRAY_PATCH
{
elog(WARN, "array_set: array bound exceeded");
return((char *)array);
}
#else
return((char *)array);
#endif
offset = GetOffset( n, dim, lb, indx);
if (ARR_IS_LO(array)) {
@ -924,7 +935,41 @@ array_set(ArrayType *array,
if (nbytes - offset < 1) return((char *)array);
pos = ARR_DATA_PTR (array) + offset;
} else {
#ifdef ARRAY_PATCH
ArrayType *newarray;
char *elt_ptr;
int oldsize, newsize, oldlen, newlen, lth0, lth1, lth2;
elt_ptr = array_seek(ARR_DATA_PTR(array), -1, offset);
oldlen = INTALIGN(*(int32 *)elt_ptr);
newlen = INTALIGN(*(int32 *)dataPtr);
if (oldlen == newlen) {
/* new element with same size, overwrite old data */
ArrayCastAndSet(dataPtr, (bool)reftype, elmlen, elt_ptr);
return((char *)array);
}
/* new element with different size, reallocate the array */
oldsize = array->size;
lth0 = ARR_OVERHEAD(n);
lth1 = (int)(elt_ptr - ARR_DATA_PTR(array));
lth2 = (int)(oldsize - lth0 - lth1 - oldlen);
newsize = lth0 + lth1 + newlen + lth2;
newarray = (ArrayType *)palloc(newsize);
memmove((char *)newarray, (char *)array, lth0+lth1);
newarray->size = newsize;
newlen = ArrayCastAndSet(dataPtr, (bool)reftype, elmlen,
(char *)newarray+lth0+lth1);
memmove((char *)newarray+lth0+lth1+newlen,
(char *)array+lth0+lth1+oldlen, lth2);
/* ??? who should free this storage ??? */
return((char *)newarray);
#else
elog(WARN, "array_set: update of variable length fields not supported");
#endif
}
ArrayCastAndSet(dataPtr, (bool) reftype, elmlen, pos);
return((char *)array);