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Add comments describing interface to heap_getattr().

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This commit is contained in:
Bryan Henderson 1996-12-09 01:22:17 +00:00
parent 6cfb12e0cf
commit b36e3042e7
1 changed files with 30 additions and 21 deletions
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17
src/backend/access/common/heaptuple.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.17 1996/12/04 03:05:55 bryanh Exp $ * $Header: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v 1.18 1996/12/09 01:22:17 bryanh Exp $
* *
* NOTES * NOTES
* The old interface functions have been converted to macros * The old interface functions have been converted to macros
@ -660,9 +660,18 @@ fastgetattr(HeapTuple tup,
/* ---------------- /* ----------------
* heap_getattr * heap_getattr
* *
* returns an attribute from a heap tuple. uses * Find a particular field in a row represented as a heap tuple.
* ---------------- * We return a pointer into that heap tuple, which points to the
*/ * first byte of the value of the field in question.
*
* If the field in question has a NULL value, we return a null
* pointer and return <*isnull> == true. Otherwise, we return
* <*isnull> == false.
*
* <tup> is the pointer to the heap tuple. <attnum> is the attribute
* number of the column (field) caller wants. <tupleDesc> is a
* pointer to the structure describing the row and all its fields.
* ---------------- */
char * char *
heap_getattr(HeapTuple tup, heap_getattr(HeapTuple tup,
Buffer b, Buffer b,