src/base/string/raw/itoa.c


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static char *
kernel(char *s, int x)
{
    if(x/10)
        s = kernel(s, x/10);
    *s++ = x%10 + '0';
    return s;
}

char *
str·itoa(char *s, int x)
{
    if(x<0){
        *s++ = '-';
        x=-x;
    }
    s  = kernel(s, x);
    *s = '0';

    return s;
}