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Add comments re text <-> bytea internal equivalence in convert routines.

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This commit is contained in:
Andrew Dunstan 2007-09-24 16:38:24 +00:00
parent 82467e4e70
commit a1b14ae1dd
1 changed files with 11 additions and 1 deletions
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12
src/backend/utils/mb/mbutils.c
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@ -4,7 +4,7 @@
* (currently mule internal code (mic) is used)
* Tatsuo Ishii
*
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.65 2007/09/24 14:59:37 adunstan Exp $
* $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.66 2007/09/24 16:38:24 adunstan Exp $
*/
#include "postgres.h"
@ -305,6 +305,10 @@ pg_convert_to(PG_FUNCTION_ARGS)
namein, CStringGetDatum(DatabaseEncoding->name));
Datum result;
/* pg_convert expects a bytea as its first argument. We're passing it
* a text argument here, relying on the fact that they are both in fact
* varlena types, and thus structurally identical.
*/
result = DirectFunctionCall3(
pg_convert, string, src_encoding_name, dest_encoding_name);
@ -334,6 +338,12 @@ pg_convert_from(PG_FUNCTION_ARGS)
/* free memory allocated by namein */
pfree((void *) src_encoding_name);
/* pg_convert returns a bytea, which we in turn return as text, relying
* on the fact that they are both in fact varlena types, and thus
* structurally identical. Although not all bytea values are valid text,
* in this case it will be because we've told pg_convert to return one
* that is valid as text in the current database encoding.
*/
PG_RETURN_TEXT_P(result);
}