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alloca()
Defined in alloca.h, the alloca()
function allocates local storage in a function. It returns a pointer to the number of bytes of memory allocated.
Syntax
void
*alloca(size_t size
);
Usage
The default implementation returns an eight-byte aligned block of memory on the stack.
Memory returned from alloca()
must never
be passed to free()
. Instead, the memory is de-allocated
automatically when the function that called alloca()
returns.
Note
alloca()
must not be called through a
function pointer. You must take care when using alloca()
and setjmp()
in
the same function, because memory allocated by alloca()
between
calling setjmp()
and longjmp()
is
de-allocated by the call to longjmp()
.
This function is a common nonstandard extension to many C libraries.
Returns
Returns in size
a pointer to the number of bytes of
memory allocated.