🚀 go-pugleaf

This was found using GNU sed 1.08 while
trying to build TeX 3.14 mf. I have simplified
the test case down to a minimum.

Take this sed program

: again
/\.$/{
	N
	s/\.\n/./
	t again
}
s/\.hh/.hhfield/g

Apply it to this input file

foo.hh.bar.
xyzzy

and the last s command is applied too many times.
The jump 't again' transfers outside of the currently executing
subprogram but that is not reflected in the sed execution.
At the jump, it jumps but does not exit the current invokation
of execute_program. So the final substitution happens, we return
from execute_program back to the original execute_program loop
that then applies the substitution again. We end up with the
text

foo.hhfieldfield.bar.xyzzy  instead of the expected
foo.hhfield.bar.xyzzy

I have currently NO idea how to fix it (without breaking anything else)

EF

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Erik Forsberg, erik@eab.retix.com Phone: (310) 476-7133 FAX: (310) 476-7657