RossComputerGuy/stardustos

/**
    * StardustOS libc - (C) 2019 Tristan Ross
    */
#include <stdlib.h>

char* ultoa(unsigned long value, char* ptr, int base) {
    unsigned long t = 0;
    unsigned long tmp = value;
    int count = 0;
    if (ptr == NULL) return NULL;
    if (tmp == 0) count++;
    while (tmp > 0) {
        tmp = tmp/base;
        count++;
    }
    ptr += count;
    *ptr = '\0';
    do {
        unsigned long res = value - base * (t = value / base);
        if (res < 10) * -- ptr = '0' + res;
        else if ((res >= 10) && (res < 16)) * --ptr = 'A' - 10 + res;
    } while ((value = t) != 0);
    return ptr;
}