C Concatenate string in while loop

Question

I\'m trying to concatenate part of a struct with hex values. I run over every byte in the loop and convert to hex, then I want to concatenate all the hex into one long strin

Answer 1

In do_file(), you are copying the hex value for a single byte in a while loop. Thus, you should go to the next byte of character array buffer with each iteration of the while loop i.e. buffer++ or strcpy(buffer[loop], msg);