C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_stackavail
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _stackavail function returns the approximate size, in bytes,
     of the stack space available for dynamic memory allocation with
     the _alloca function.
 
     Return Value
 
     The stackavail function returns the size in bytes as an unsigned
     integer value.
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