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Simplify and standardize conversions between TEXT datums and ordinary C

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strings.  This patch introduces four support functions cstring_to_text,
cstring_to_text_with_len, text_to_cstring, and text_to_cstring_buffer, and
two macros CStringGetTextDatum and TextDatumGetCString.  A number of
existing macros that provided variants on these themes were removed.

Most of the places that need to make such conversions now require just one
function or macro call, in place of the multiple notational layers that used
to be needed.  There are no longer any direct calls of textout or textin,
and we got most of the places that were using handmade conversions via
memcpy (there may be a few still lurking, though).

This commit doesn't make any serious effort to eliminate transient memory
leaks caused by detoasting toasted text objects before they reach
text_to_cstring.  We changed PG_GETARG_TEXT_P to PG_GETARG_TEXT_PP in a few
places where it was easy, but much more could be done.

Brendan Jurd and Tom Lane
This commit is contained in:
Tom Lane
2008-03-25 22:42:46 +00:00
parent f948197b40
commit 220db7ccd8
94 changed files with 771 additions and 1211 deletions
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21
src/backend/libpq/be-fsstubs.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/be-fsstubs.c,v 1.88 2008/03/22 01:55:14 ishii Exp $
* $PostgreSQL: pgsql/src/backend/libpq/be-fsstubs.c,v 1.89 2008/03/25 22:42:43 tgl Exp $
*
* NOTES
* This should be moved to a more appropriate place. It is here
@@ -47,6 +47,7 @@
#include "miscadmin.h"
#include "storage/fd.h"
#include "storage/large_object.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
@@ -320,7 +321,7 @@ lowrite(PG_FUNCTION_ARGS)
Datum
lo_import(PG_FUNCTION_ARGS)
{
text *filename = PG_GETARG_TEXT_P(0);
text *filename = PG_GETARG_TEXT_PP(0);
PG_RETURN_OID(lo_import_internal(filename, InvalidOid));
}
@@ -332,7 +333,7 @@ lo_import(PG_FUNCTION_ARGS)
Datum
lo_import_with_oid(PG_FUNCTION_ARGS)
{
text *filename = PG_GETARG_TEXT_P(0);
text *filename = PG_GETARG_TEXT_PP(0);
Oid oid = PG_GETARG_OID(1);
PG_RETURN_OID(lo_import_internal(filename, oid));
@@ -362,11 +363,7 @@ lo_import_internal(text *filename, Oid lobjOid)
/*
* open the file to be read in
*/
nbytes = VARSIZE(filename) - VARHDRSZ;
if (nbytes >= MAXPGPATH)
nbytes = MAXPGPATH - 1;
memcpy(fnamebuf, VARDATA(filename), nbytes);
fnamebuf[nbytes] = '\0';
text_to_cstring_buffer(filename, fnamebuf, sizeof(fnamebuf));
fd = PathNameOpenFile(fnamebuf, O_RDONLY | PG_BINARY, 0666);
if (fd < 0)
ereport(ERROR,
@@ -410,7 +407,7 @@ Datum
lo_export(PG_FUNCTION_ARGS)
{
Oid lobjId = PG_GETARG_OID(0);
text *filename = PG_GETARG_TEXT_P(1);
text *filename = PG_GETARG_TEXT_PP(1);
File fd;
int nbytes,
tmp;
@@ -441,11 +438,7 @@ lo_export(PG_FUNCTION_ARGS)
* 022. This code used to drop it all the way to 0, but creating
* world-writable export files doesn't seem wise.
*/
nbytes = VARSIZE(filename) - VARHDRSZ;
if (nbytes >= MAXPGPATH)
nbytes = MAXPGPATH - 1;
memcpy(fnamebuf, VARDATA(filename), nbytes);
fnamebuf[nbytes] = '\0';
text_to_cstring_buffer(filename, fnamebuf, sizeof(fnamebuf));
oumask = umask((mode_t) 0022);
fd = PathNameOpenFile(fnamebuf, O_CREAT | O_WRONLY | O_TRUNC | PG_BINARY, 0666);
umask(oumask);