argv_ref patch 27: allow NUL through more builtins

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It's been a while since I've worked on porting the argv_ref branch to
master, but I finally got one done.  This fixes regular expressions,
format, and translit to transparently handle NUL; mostly a matter of
passing lengths around rather than NUL-termination (thank heavens that
glibc, and thus gnulib, already provide a regex interface that handles
NUL).  No big change in speed or memory usage.  And as long as I was
editing format, I made it better able to detect excess or missing
arguments.  Meanwhile, I didn't see a way to use NUL in eval, so that now
warns.

	Stage 27: Allow embedded NUL in text processing macros.
	Pass NUL through regular expressions, format, and translit, and
	diagnose it in eval.  Improve warning capabilities of format.
	Memory impact: none.
	Speed impact: none noticed.
	* src/m4.h (evaluate): Add parameter.
	* src/builtin.c (compile_pattern) [DEBUG_REGEX]: Support NUL in
	output messages.
	(set_macro_sequence): Likewise.
	(m4_eval): Normalize messages, and adjust caller.
	(expand_ranges, substitute): Support NUL in macro expansion.
	(m4_translit, m4_regexp, m4_patsubst): Adjust callers, to manage
	NUL bytes.
	* src/format.c (expand_format): Manage NUL bytes.
	* src/eval.c (eval_error): Add EMPTY_ARGUMENT.
	(end_text): New variable.
	(eval_init_lex): Add parameter.
	(eval_lex, evaluate): Detect NUL in macro expansion.
	* doc/m4.texinfo (Format): Update to cover new behavior.
	(Eval): Mention that result is unquoted.
	* examples/null.m4: Enhance test.
	* examples/null.err: Update expected output.
	* examples/null.out: Likewise.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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