what does the - operator do with char *?

Question

I new to C. I am reading a find-replace algorithm for C and I am a bit confused what the - & + operators do in this code:

char *re         


        

Answer 1

it is a simple pointer arithmetics.

buffer + i is the substring of buffer, that starts from the ith character [until the end]

p - src is giving you the offset between p to src.