C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_memmax
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <malloc.h>
 
  Syntax:    size_t _memmax( void );
 
  Returns:   size in bytes of largest contiguous free space in the near
             heap if successful; otherwise, 0.
 
  See also:  _msize, _memavl
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