nagolove

typedef struct {
  int a;
  char *buf;
} BUFFER;

BUFFER buffer_alloc(int num) {
  BUFFER *b = malloc(sizeof(*b) + num * sizeof(b->[0]));
  b->buf = (char*)b + sizeof(*b);
  return b;
}

BUFFER *bb = buffer_alloc(10);
bb->buf[9] = 1;