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Trying to extract a string from a pointer. #4595

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locallycompact opened this issue Nov 22, 2018 · 0 comments

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locallycompact commented Nov 22, 2018 •

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Hi, I'm really confused as to how to just pull a String out from a double pointer. I'm trying to bind the libpcap interface here: http://www.tcpdump.org/manpages/pcap_next_ex.3pcap.html

The FFI seems to succeed, the Ptr is filled, but fails trying to turn it into a String.

Steps to Reproduce

Use the code here: https://gitlab.com/locallycompact/pcap-idris

nix-shell -p gnumake -p gmp -p libpcap -p glibc
stack exec --nix-packages libpcap  --resolver lts-11.14 -- idris --cg-opt '-D_GNU_SOURCE' --package contrib pcap.idr -o pcap

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