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# <alloca.h>: Allocate space in the stack

## Detailed Description

## Functions
void * | alloca (size_t __size)

## Function Documentation

void* alloca | ( | size_t | __size | ) |

Allocate __size bytes of space in the stack frame of the caller.

This temporary space is automatically freed when the function that called alloca() returns to its caller. Avr-libc defines the alloca() as a macro, which is translated into the inlined `__builtin_alloca()` function. The fact that the code is inlined, means that it is impossible to take the address of this function, or to change its behaviour by linking with a different library.

Returns:
  alloca() returns a pointer to the beginning of the allocated space. If the allocation causes stack overflow, program behaviour is undefined.

Warning:
  Avoid use alloca() inside the list of arguments of a function call.

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