Function backtrace_vector_grow

external/tracy/libbacktrace/alloc.cpp:84–121

/* Grow VEC by SIZE bytes.  */

void *
backtrace_vector_grow (struct backtrace_state *state ATTRIBUTE_UNUSED,
		       size_t size, backtrace_error_callback error_callback,
		       void *data, struct backtrace_vector *vec)
{
  void *ret;

  if (size > vec->alc)
    {
      size_t alc;
      void *base;

      if (vec->size == 0)
	alc = 32 * size;
      else if (vec->size >= 4096)
	alc = vec->size + 4096;
      else
	alc = 2 * vec->size;

      if (alc < vec->size + size)
	alc = vec->size + size;

      base = rprealloc (vec->base, alc);
      if (base == NULL)
	{
	  error_callback (data, "realloc", errno);
	  return NULL;
	}

      vec->base = base;
      vec->alc = alc - vec->size;
    }

  ret = (char *) vec->base + vec->size;
  vec->size += size;
  vec->alc -= size;
  return ret;
}

/* Finish the current allocation on VEC.  */