Unify memory allocation in smart_str functions

Cleanup SCANNER_DEBUG and don't NUL terminate work buffer

Use emalloc and friends. Since we reuse all buffers, this does not affect
the speed.

The smart_str_* functions don't NUL terminate strings anymore. We can
rely on the length of the s

Use emalloc and friends. Since we reuse all buffers, this does not affect
the speed.

The smart_str_* functions don't NUL terminate strings anymore. We can
rely on the length of the strings completely.

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Remove this pseudo optimization from the previous rewrite.

Since we leave/enter the loop more often, the cost of maintaining
c_arg/c_val is higher than simply copying the tag/arg string

Remove this pseudo optimization from the previous rewrite.

Since we leave/enter the loop more often, the cost of maintaining
c_arg/c_val is higher than simply copying the tag/arg string once.

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Another 5%-10% speed increase achieved by

- making ctx->val read-only
- adding a special appendc function for appending single characters

Add support for URLs containing NAME info (for scrolling; #name).

2nd Rewrite of the main scanner engine. This version is cleaner and faster.

It handles the following tags currently:

<FRAME .. SRC=URL ..>
<INPUT .. TYPE=IMAGE SRC=URL ..>
<

2nd Rewrite of the main scanner engine. This version is cleaner and faster.

It handles the following tags currently:

<FRAME .. SRC=URL ..>
<INPUT .. TYPE=IMAGE SRC=URL ..>
<A .. HREF=URL ..>
<AREA .. HREF=URL ..>
<IMG .. SRC=URL ..>

Additional ones can be added within seconds.

The support for HTML forms has been significantly improved. The scanner
will now add proper Hidden Fields for the Session ID.

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Reduce the amount of copying in the mainloop. We copy tag/arg only, if we
need to preserve them for a new loop iteration (after we leave mainloop).
Otherwise, we can just let them point to th

Reduce the amount of copying in the mainloop. We copy tag/arg only, if we
need to preserve them for a new loop iteration (after we leave mainloop).
Otherwise, we can just let them point to the work area.

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Revert part of last commit. I'll refine it later.

Another speedup by avoiding string copies.

15% speed gain in test case (rewriting 1M URLs).

Remove nextiter label

s/DEBUG/SCANNER_DEBUG/. "Convert" one macro to inline function to be more
consistent. Also use continue.

Fix a few build bugs, still no go

Add new URL scanner. This version is up to 20% faster. It will be
enabled by default once I'm sure that it works in every case.

To enable it, apply s/url_adapt_ext/url_adapt_ext_ex/ to s

Add new URL scanner. This version is up to 20% faster. It will be
enabled by default once I'm sure that it works in every case.

To enable it, apply s/url_adapt_ext/url_adapt_ext_ex/ to session.c

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