(c-forward-syntactic-ws, c-backward-syntactic-ws):

(c-forward-syntactic-ws, c-backward-syntactic-ws):
Don't narrow, just make a simple check against the given limit.

(c-collect-line-comments): New function.

(c-literal-limits): New function that finds the start and end pos
of a comment or string surrounding point.

(c-literal-limits-fast): A faster variant of `c-literal-limits'
for newer Emacsen where the state returned from
`parse-partial-sexp' contains the starting pos of the last literal.

(c-parse-state): Use (c-point 'bod) instead of
beginning-of-defun directly.

(c-guess-basic-syntax): Fixed a few byte compiler warnings.

(c-backward-to-start-of-do): Break infloop for
invalid code, e.g. when someone types while (TRUE) { at the top of
a buffer, we shouldn't hang when the { is typed!

(c-backward-to-start-of-if): Ensure never
move forward, not even if point < lim.

(c-search-uplist-for-classkey): When searching up for a class key,
instead of hardcoding the extended search for "extern", use the new
variable c-extra-toplevel-key, which is language dependent.  For C++,
this variable includes the keyword "namespace" which will match C++
namespace introducing blocks.

(c-guess-basic-syntax): Support for recognizing C++ namespace
blocks, by elaborating on the mechanism used to find external
language blocks.  Searches which hardcoded "extern" now use
c-extra-toplevel-key, a language dependent variable.  Case clauses
that were modified: CASE 5A.1, CASE 5A.4, CASE 5F, CASE 5I, CASE
14A.

CASE 3: we can now determine whether we're at the beginning of a
 	cpp macro definition, or inside the middle of one. Set syntax to
 	'cpp-macro in the former case, 'cpp-macro-cont in the latter.  In
 	both cases, the relpos is the beginning of the macro.

(c-forward-syntactic-ws): Added code that skips forward over
multi-line cpp macros.

(c-beginning-of-macro): Moved, and made into a defsubst.  This
function can now actually find the beginning of a multi-line C
preprocessor macro.

(c-backward-syntactic-ws): Use c-beginning-of-macro to skip backwards
over multi-line macro definitions.

(c-in-literal, c-fast-in-literal): Use c-beginning-of-macro to
find out whether we're in a multi-line macro definition.

(c-fast-in-literal): Function which should be faster than
c-in-literal.  In XEmacs, this uses buffer-syntactic-context.