Search code examples
chexarp

c programming put a hexa into char

I have 

    unsigned char src_mac[6];

that holds values with the %02x format.For example to find the value in src_mac[0] i do:

    printf("%02x\n",src_mac[0]);

I want to know how to put values in src_mac(I need to put a mac adress saved as a string into src_mac and then put the mac adress into a ether_arp structure.

Solution

  • Editing my answer... i misread it

    Anyway, try this sscanf with hhx as parameters... it means it will read an hex value and will store it as a char (unlikely the default that store the value as int)

    sscanf(string_mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &src_mac[5], &src_mac[4], &src_mac[3], 
                                                    &src_mac[2], &src_mac[1], &src_mac[0]);