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Add lo_truncate() to backend and libpq for large object truncation.

Browse Source 
Kris Jurka
This commit is contained in:
Bruce Momjian
2007-03-03 19:52:47 +00:00
parent 90d76525c5
commit 0763a56501
12 changed files with 372 additions and 26 deletions
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38
src/backend/libpq/be-fsstubs.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/be-fsstubs.c,v 1.85 2007/02/27 23:48:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/libpq/be-fsstubs.c,v 1.86 2007/03/03 19:52:46 momjian Exp $
*
* NOTES
* This should be moved to a more appropriate place. It is here
@@ -120,12 +120,10 @@ lo_close(PG_FUNCTION_ARGS)
int32 fd = PG_GETARG_INT32(0);
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
PG_RETURN_INT32(-1);
}
#if FSDB
elog(DEBUG4, "lo_close(%d)", fd);
#endif
@@ -152,12 +150,9 @@ lo_read(int fd, char *buf, int len)
int status;
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
return -1;
}
status = inv_read(cookies[fd], buf, len);
@@ -170,12 +165,9 @@ lo_write(int fd, const char *buf, int len)
int status;
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
return -1;
}
if ((cookies[fd]->flags & IFS_WRLOCK) == 0)
ereport(ERROR,
@@ -198,12 +190,9 @@ lo_lseek(PG_FUNCTION_ARGS)
int status;
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
PG_RETURN_INT32(-1);
}
status = inv_seek(cookies[fd], offset, whence);
@@ -248,12 +237,9 @@ lo_tell(PG_FUNCTION_ARGS)
int32 fd = PG_GETARG_INT32(0);
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
PG_RETURN_INT32(-1);
}
PG_RETURN_INT32(inv_tell(cookies[fd]));
}
@@ -467,6 +453,26 @@ lo_export(PG_FUNCTION_ARGS)
PG_RETURN_INT32(1);
}
/*
* lo_truncate -
* truncate a large object to a specified length
*/
Datum
lo_truncate(PG_FUNCTION_ARGS)
{
int32 fd = PG_GETARG_INT32(0);
int32 len = PG_GETARG_INT32(1);
if (fd < 0 || fd >= cookies_size || cookies[fd] == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("invalid large-object descriptor: %d", fd)));
inv_truncate(cookies[fd], len);
PG_RETURN_INT32(0);
}
/*
* AtEOXact_LargeObject -
* prepares large objects for transaction commit