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#include <stdbool.h>
#include <string.h>
static const char *numbers = "0123456789abcdef";
char *
utoa(char *p, unsigned x, int base)
{
p += 3 * sizeof(unsigned);
*--p = '\0';
do {
*--p = numbers[x % base];
x /= base;
} while (x);
return p;
}
char *
itoa(char *p, int x, int base)
{
const bool is_negative = (x < 0);
if (is_negative) x = -x;
p = utoa(p, x, base);
if (is_negative) *--p = '-';
return p;
}
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