C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_stackavail
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <malloc.h>
 
  Syntax:    size_t _stackavail( void );
 
  Returns:   the size in bytes.
 
  See also:  _alloca
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