convert hex2str in C

Pengen tulis tentang utiliti convert dari hex ke string di C, kita liat langsung ke kodenya ya

#include  <stdio.h>
#include  <stdlib.h>
#include  <string.h>

unsigned int wub_find_str_end_pt(unsigned char *str)
{
    unsigned int i;
    i = 0;
    while (str[i] != 0x00)
        i ++;
    return i;
}

unsigned char wub_hex_2_ascii(unsigned char hex)
{
    if (hex  <=  9)
        return hex + '0';
    else
        return hex - 10 + 'A';
}

void wub_str_append_byte_hex(unsigned char *str, unsigned char dat)
{
    unsigned int i;
    i = wub_find_str_end_pt (str);
    str[i ++] = wub_hex_2_ascii (dat / 16);
    str[i ++] = wub_hex_2_ascii (dat % 16);;
    str[i] = 0x00;
}

unsigned int wub_hex_2_str (unsigned char *hex, unsigned char *str, unsigned int len)
{
    unsigned int i;
    str[0] = 0;
    for (i = 0; i < len; i ++)
        wub_str_append_byte_hex(str, hex[i]);
    return len * 2;
}

int main()
{
     char hex[255] = "\x00\x01\x09\x0A" ;
     char str[255];

    memset( str, 0x00, sizeof(str) );

  
    wub_hex_2_str(hex, str, 4);

    printf("str %s\n", str );
}

Output :
str  0001090A

Sekian dulu yaa :)