n int to b base string in C

itob.c

void itob(int n, char s[], int b)
{
    int i = 0, temp;

    n = n > 0 ? n : -n;

    do {
        temp = n % b;
        if(temp < 10)
            s[i++] = '0' + temp;
        else
            s[i++] = 'A' + temp - 10;
    } while((n /= b) > 0);

    s[i] = '\0';
    reverse(s);
}