changed: Curl's overflow buffer handling

[arnova]

@mkortstiege : Please review.

[arnova]

jenkins build this please

[mkortstiege]

Not my department really. Maybe @Paxxi could have a look at this as well?

[Paxxi]

@arnova Both calls to memcpy should be replaced with memmove afaik. Memcpy where dst and src overlap is undefined behaviour, will need to go through it more thoroughly for rest of the review.

[arnova]

@Paxxi: Yeah but memmove is slower since it uses an extra buffer and doesn't memcpy start at the bottom?

[fritsch]

If it overlaps -> no memcpy.

[arnova]

@fritsch / @Paxxi: Thanks for the heads up. Just read that memmove() may not be that slower after all anyway. Changed it to memmove now.

[arnova]

jenkins build this please

[MartijnKaijser]

ignore build fail

[arnova]

@Paxxi : You're fine with this?

[Paxxi]

@arnova yup looks fine