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The cstring datatype can now be copied, passed around, etc. The typlen

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value '-2' is used to indicate a variable-width type whose width is
computed as strlen(datum)+1.  Everything that looks at typlen is updated
except for array support, which Joe Conway is working on; at the moment
it wouldn't work to try to create an array of cstring.
This commit is contained in:
Tom Lane
2002-08-24 15:00:47 +00:00
parent cf4d885c67
commit 976246cc7e
23 changed files with 260 additions and 198 deletions
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43
src/backend/access/common/heaptuple.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.78 2002/07/20 05:16:56 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.79 2002/08/24 15:00:45 tgl Exp $
*
* NOTES
* The old interface functions have been converted to macros
@ -48,7 +48,7 @@ ComputeDataSize(TupleDesc tupleDesc,
if (nulls[i] != ' ')
continue;
data_length = att_align(data_length, att[i]->attlen, att[i]->attalign);
data_length = att_align(data_length, att[i]->attalign);
data_length = att_addlength(data_length, att[i]->attlen, value[i]);
}
@ -69,7 +69,7 @@ DataFill(char *data,
{
bits8 *bitP = 0;
int bitmask = 0;
uint32 data_length;
Size data_length;
int i;
int numberOfAttributes = tupleDesc->natts;
Form_pg_attribute *att = tupleDesc->attrs;
@ -105,12 +105,13 @@ DataFill(char *data,
}
/* XXX we are aligning the pointer itself, not the offset */
data = (char *) att_align((long) data, att[i]->attlen, att[i]->attalign);
data = (char *) att_align((long) data, att[i]->attalign);
if (att[i]->attbyval)
{
/* pass-by-value */
store_att_byval(data, value[i], att[i]->attlen);
data_length = att[i]->attlen;
}
else if (att[i]->attlen == -1)
{
@ -123,15 +124,22 @@ DataFill(char *data,
data_length = VARATT_SIZE(DatumGetPointer(value[i]));
memcpy(data, DatumGetPointer(value[i]), data_length);
}
else if (att[i]->attlen == -2)
{
/* cstring */
*infomask |= HEAP_HASVARLENA;
data_length = strlen(DatumGetCString(value[i])) + 1;
memcpy(data, DatumGetPointer(value[i]), data_length);
}
else
{
/* fixed-length pass-by-reference */
Assert(att[i]->attlen >= 0);
memcpy(data, DatumGetPointer(value[i]),
(size_t) (att[i]->attlen));
Assert(att[i]->attlen > 0);
data_length = att[i]->attlen;
memcpy(data, DatumGetPointer(value[i]), data_length);
}
data = (char *) att_addlength((long) data, att[i]->attlen, value[i]);
data += data_length;
}
}
@ -235,7 +243,8 @@ nocachegetattr(HeapTuple tuple,
if (att[attnum]->attcacheoff != -1)
{
return fetchatt(att[attnum],
(char *) tup + tup->t_hoff + att[attnum]->attcacheoff);
(char *) tup + tup->t_hoff +
att[attnum]->attcacheoff);
}
#endif
}
@ -243,9 +252,7 @@ nocachegetattr(HeapTuple tuple,
{
/*
* there's a null somewhere in the tuple
*/
/*
*
* check to see if desired att is null
*/
@ -346,11 +353,7 @@ nocachegetattr(HeapTuple tuple,
(HeapTupleNoNulls(tuple) || !att_isnull(j, bp)) &&
(HeapTupleAllFixed(tuple) || att[j]->attlen > 0)); j++)
{
/*
* Fix me when going to a machine with more than a four-byte
* word!
*/
off = att_align(off, att[j]->attlen, att[j]->attalign);
off = att_align(off, att[j]->attalign);
att[j]->attcacheoff = off;
@ -391,7 +394,7 @@ nocachegetattr(HeapTuple tuple,
off = att[i]->attcacheoff;
else
{
off = att_align(off, att[i]->attlen, att[i]->attalign);
off = att_align(off, att[i]->attalign);
if (usecache)
att[i]->attcacheoff = off;
@ -399,11 +402,11 @@ nocachegetattr(HeapTuple tuple,
off = att_addlength(off, att[i]->attlen, tp + off);
if (usecache && att[i]->attlen == -1)
if (usecache && att[i]->attlen <= 0)
usecache = false;
}
off = att_align(off, att[attnum]->attlen, att[attnum]->attalign);
off = att_align(off, att[attnum]->attalign);
return fetchatt(att[attnum], tp + off);
}