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c7b8998ebb
Change pg_bsd_indent to follow upstream rules for placement of comments
to the right of code, and remove pgindent hack that caused comments
following #endif to not obey the general rule.
Commit e3860ffa4d wasn't actually using
the published version of pg_bsd_indent, but a hacked-up version that
tried to minimize the amount of movement of comments to the right of
code. The situation of interest is where such a comment has to be
moved to the right of its default placement at column 33 because there's
code there. BSD indent has always moved right in units of tab stops
in such cases --- but in the previous incarnation, indent was working
in 8-space tab stops, while now it knows we use 4-space tabs. So the
net result is that in about half the cases, such comments are placed
one tab stop left of before. This is better all around: it leaves
more room on the line for comment text, and it means that in such
cases the comment uniformly starts at the next 4-space tab stop after
the code, rather than sometimes one and sometimes two tabs after.
Also, ensure that comments following #endif are indented the same
as comments following other preprocessor commands such as #else.
That inconsistency turns out to have been self-inflicted damage
from a poorly-thought-through post-indent "fixup" in pgindent.
This patch is much less interesting than the first round of indent
changes, but also bulkier, so I thought it best to separate the effects.
Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org
Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* PostgreSQL definitions for managed Large Objects.
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*
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* contrib/lo/lo.c
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*
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*/
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#include "postgres.h"
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#include "commands/trigger.h"
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#include "executor/spi.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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PG_MODULE_MAGIC;
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/*
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* This is the trigger that protects us from orphaned large objects
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*/
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PG_FUNCTION_INFO_V1(lo_manage);
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Datum
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lo_manage(PG_FUNCTION_ARGS)
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{
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TriggerData *trigdata = (TriggerData *) fcinfo->context;
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int attnum; /* attribute number to monitor */
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char **args; /* Args containing attr name */
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TupleDesc tupdesc; /* Tuple Descriptor */
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HeapTuple rettuple; /* Tuple to be returned */
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bool isdelete; /* are we deleting? */
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HeapTuple newtuple; /* The new value for tuple */
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HeapTuple trigtuple; /* The original value of tuple */
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if (!CALLED_AS_TRIGGER(fcinfo)) /* internal error */
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elog(ERROR, "%s: not fired by trigger manager",
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trigdata->tg_trigger->tgname);
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if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event)) /* internal error */
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elog(ERROR, "%s: must be fired for row",
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trigdata->tg_trigger->tgname);
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/*
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* Fetch some values from trigdata
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*/
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newtuple = trigdata->tg_newtuple;
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trigtuple = trigdata->tg_trigtuple;
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tupdesc = trigdata->tg_relation->rd_att;
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args = trigdata->tg_trigger->tgargs;
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if (args == NULL) /* internal error */
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elog(ERROR, "%s: no column name provided in the trigger definition",
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trigdata->tg_trigger->tgname);
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/* tuple to return to Executor */
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if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
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rettuple = newtuple;
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else
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rettuple = trigtuple;
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/* Are we deleting the row? */
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isdelete = TRIGGER_FIRED_BY_DELETE(trigdata->tg_event);
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/* Get the column we're interested in */
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attnum = SPI_fnumber(tupdesc, args[0]);
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if (attnum <= 0)
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elog(ERROR, "%s: column \"%s\" does not exist",
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trigdata->tg_trigger->tgname, args[0]);
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/*
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* Handle updates
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*
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* Here, if the value of the monitored attribute changes, then the large
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* object associated with the original value is unlinked.
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*/
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if (newtuple != NULL)
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{
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char *orig = SPI_getvalue(trigtuple, tupdesc, attnum);
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char *newv = SPI_getvalue(newtuple, tupdesc, attnum);
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if (orig != NULL && (newv == NULL || strcmp(orig, newv) != 0))
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DirectFunctionCall1(be_lo_unlink,
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ObjectIdGetDatum(atooid(orig)));
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if (newv)
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pfree(newv);
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if (orig)
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pfree(orig);
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}
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/*
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* Handle deleting of rows
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*
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* Here, we unlink the large object associated with the managed attribute
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*/
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if (isdelete)
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{
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char *orig = SPI_getvalue(trigtuple, tupdesc, attnum);
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if (orig != NULL)
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{
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DirectFunctionCall1(be_lo_unlink,
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ObjectIdGetDatum(atooid(orig)));
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pfree(orig);
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}
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}
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return PointerGetDatum(rettuple);
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}
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