#include <stdlib.h>
#define ITOA(i)\
  ({\
    __typeof__(i) _i = (i), negative = _i < 0 ? 1 : 0;\
    const char digits[] = "0123456789";\
    char *str = malloc((size_t)log10(_i) + 2 + negative) + (int)log10(_i) + 1 + negative;\
    *str-- = 0;\
    for(; _i; _i /= 10) *str-- = digits[_i % 10];\
    if(negative) *str-- = '-';\
    ++str;\
  })