az_itoa.c

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// kernel_lib_printf_functions
/*
 * Kernel Lib Printf Functions
 *
 * Maintainer: Park Jiwoo
 *
 * Copyright (C) 2024 Park-Jiwoo
 *
 */
#include "kernel_pr_he.h"
 
static int az_pow(int nb, int pow)
{
    if (pow == 0)
        return (1);
    else
        return (nb * az_pow(nb, pow - 1));
}
 
char *az_itoa(int value, int base)
{
    int i;
    char *nbr;
    int neg;
 
    // 10진수
    // base = 10..
 
    i = 1;
    neg = 0;
    if (value < 0)
    {
        if (base == 10)
            neg = 1;
        value *= -1;
    }
 
    while (az_pow(base, i) - 1 < value)
        i++;
 
    nbr = (char *)malloc(sizeof(nbr) * i);
 
    nbr[i + neg] = '\0';
 
    while (i-- > 0)
    {
        nbr[i + neg] = (value % base) + (value % base > 9 ? 'A' - 10 : '0');
        value = value / base;
    }
    if (neg)
        nbr[0] = '-';
 
    return (nbr);
}