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a2bc49bed1
This should fix various crashes that remain, at least:
* when running a PS2 discipline at parse time
* when pressing Ctrl+C on a PS2 prompt
* when a special builtin within a discipline throws an error within
a virtual subshell
src/cmd/ksh93/sh/nvdisc.c:
- In both assign() which handles .set disciplines and lookup()
which handles .get disciplines, to stop errors in discipline
functions from wreaking havoc:
- Save, reinitialise and restore the lexer state in case the
discipline is run at parse time. This happens with PS2; I'm not
currently aware of other contexts but that doesn't mean there
aren't any or that there won't be any. Plus, I determined by
experimenting that doing this here seems to be the only way to
make it work reliably. Thankfully the overhead is low.
- Check the topfd redirection state and run sh_iorestore() if
needed. Without this, if a special builtin with a redirection
throws an error in a discipline function, its redirection(s)
remain permanent. For example, 'trap --bad-option 2>/dev/null'
in a PS2.get() discipline would kill standard error, including
all your prompts.
src/cmd/ksh93/sh/io.c: io_prompt():
- Before getting the value of the PS2 prompt, save the stack state
and restore it after. This stops a PS2.get discipline function
from corrupting a command substitution that the user is typing.
Doing this in assign()/lookup() is ineffective, so do it here.
Fixes: https://github.com/ksh93/ksh/issues/347
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