argv_ref patch 28: handle NUL in warning messages

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I'm still going rather slowly at porting the argv_ref branch into master.
 This patch rounds out the handling of embedded NUL in all of the builtins
(in most of these cases, the presence of an embedded NUL is a user bug,
but the warning message should not be truncated at the NUL).  I still need
to beef up the NEWS and manual about the fact that embedded NUL support is
now present in m4.  On the master branch, I subdivided the patch into
three roughly equal parts.  Also, working on this patch uncovered a hole
in branch-1.6 handling of warning on popdef(undef), which I patched
earlier today.  No real change in memory usage or speed.

	Stage 28: Allow embedded NUL in warning messages.
	Issue graceful error messages for a variety of places where
	embedded NUL is otherwise unhandled.  For example, numeric parsing
	rejects embedded NUL, while file-related commands warn about
	truncation at NUL, and frozen files detect unexpected NUL.
	Memory impact: none.
	Speed impact: none noticed.
	* src/m4.h (debug_decode): Add argument.
	* src/m4.c (main): Adjust caller.
	* src/format.c (arg_int, arg_long, arg_double): Likewise.
	(arg_string): New function.
	(ARG_INT, ARG_LONG, ARG_STR, ARG_DOUBLE): Support embedded NUL.
	* src/freeze.c (reload_frozen_state): Likewise.
	* src/debug.c (debug_decode): Likewise.
	* src/builtin.c (numeric_arg): Add argument.
	(m4_syscmd, m4_esyscmd, m4_eval, m4_incr, m4_decr, m4_divert)
	(m4_undivert, include, mkstemp_helper, m4_m4exit, m4_debugmode)
	(m4_debugfile, m4_index, m4_substr): Detect embedded NUL.
	(m4_defn, m4_maketemp, m4_placeholder): Improve warning message.
	* src/path.c (m4_path_search): Likewise.
	* doc/m4.texinfo (Syntax, Mkstemp, Using frozen files): Adjust
	tests.
	* examples/null.m4: Likewise.
	* examples/null.out: Likewise.
	* examples/null.err: Likewise.

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

Eric Blake             [email protected]
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