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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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22
src/include/access/tupmacs.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: tupmacs.h,v 1.21 2002/06/20 20:29:43 momjian Exp $
* $Id: tupmacs.h,v 1.22 2002/08/24 15:00:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -93,12 +93,11 @@
#endif /* SIZEOF_DATUM == 8 */
/*
* att_align aligns the given offset as needed for a datum of length attlen
* and alignment requirement attalign. In practice we don't need the length.
* The attalign cases are tested in what is hopefully something like their
* frequency of occurrence.
* att_align aligns the given offset as needed for a datum of alignment
* requirement attalign. The cases are tested in what is hopefully something
* like their frequency of occurrence.
*/
#define att_align(cur_offset, attlen, attalign) \
#define att_align(cur_offset, attalign) \
( \
((attalign) == 'i') ? INTALIGN(cur_offset) : \
(((attalign) == 'c') ? ((long)(cur_offset)) : \
@@ -111,18 +110,23 @@
/*
* att_addlength increments the given offset by the length of the attribute.
* attval is only accessed if we are dealing with a varlena attribute.
* attval is only accessed if we are dealing with a variable-length attribute.
*/
#define att_addlength(cur_offset, attlen, attval) \
( \
((attlen) != -1) ? \
((attlen) > 0) ? \
( \
(cur_offset) + (attlen) \
) \
: \
: (((attlen) == -1) ? \
( \
(cur_offset) + VARATT_SIZE(DatumGetPointer(attval)) \
) \
: \
( \
AssertMacro((attlen) == -2), \
(cur_offset) + (strlen(DatumGetCString(attval)) + 1) \
)) \
)
/*