Fix SSH_PUBKEYINFO, limit characters, add tests We fix a bad_bufptr() failure from a previous commit. We now limit the allowed characters to those that will definitely be safe in a shell. Some scripts/programs may use arbitrary environment variables without escaping correctly - that could be a problem in a restricted environment. The current allowed set is a-z A-Z 0-9 .,_-+@ This also adds a test for SSH_PUBKEYINFO, by default it only runs under github actions (or "act -j build").

#!/bin/sh

# Wrap all "#define X Y" with a #ifndef X...#endif"

sed 's/^\( *#define \([^ ][^ ]*\) .*\)/#ifndef \2\
\1\
#endif/'