Malloc

;----------------------------------------------------------------------
;
; usage:
;   malloc size [,ptr] [,oom_msg_ptr] [,fail_value]
;
;   malloc #$0100
;   malloc (ptr)
;   malloc value
;
; Note:
;   - if parameter 'ptr' is present, store resulting AY in ptr &ptr+1
;   - if parameter 'oom_msg_ptr' is present, emit string pointed by
;       'oom_msg_ptr' and return if AY is null (ie malloc error)
;
; Call XMALLOC function
;
;----------------------------------------------------------------------

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Last update: 2022-11-22