Yup. -- decrements by 1 * sizeof(type_being_pointed_to) bytes. Since the pointer was cast to (char *) first, the type being pointed to is char, which is 1 byt

Yup. -- decrements by 1 * sizeof(type_being_pointed_to) bytes. Since the pointer was cast to (char *) first, the type being pointed to is char, which is 1 byte on most systems. As others have mentioned, take some time to learn C on its own -- it will make the porting effort go faster, and serve you well generally. Have you read "The C Programming Language" by Brian Kernighan and Dennis Ritchie? (but unless that code base is really old, I suggest later-than-first edition)