fix the reported "bug in awk" where long regexps are not evaluated correctly.

the same problem exists in both native and ape versions of regexp,
character classes are restricted in size - perhaps unrealisticly to 64
characters (Runes/wchar_ts). In these days of Gbytes I went to the opposite
extreme and allowed 256 characters.

test with awk (for ape) using:

	echo hello | 8.out  '/[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ]*/ { print "hit" }'

for native I used this:

#include <u.h>
#include <libc.h>
#include <regexp.h>

extern void dump(Reprog *);

void
main(int argc, char *argv[])
{
	Reprog *re1, *re2;

	re1 = regcomp("[abcdefghijklmnopqrstuvwxyz]*");
	re2 = regcomp("[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ]*");

	if(regexec(re1, "hello", 0, 0))
		print("match short expression\n");

	if(regexec(re2, "hello", 0, 0))
		print("match long expression\n");

}


-Steve

Notes:
Thu Jan 21 19:00:26 EST 2010 geoff
    this will be fixed, but possibly with a dynamic allocation.

Thu Jan 21 19:00:54 EST 2010 geoff

Reference: /n/sources/patch/sorry/long-regexps
Date: Mon Oct 26 17:08:08 CET 2009
Signed-off-by: steve@quintile.net
Reviewed-by: geoff

--- /sys/include/ape/regexp.h	Mon Oct 26 17:03:27 2009
+++ /sys/include/ape/regexp.h	Mon Oct 26 17:03:25 2009
@@ -37,7 +37,7 @@
  */
 struct Reclass{
 	wchar_t	*end;
-	wchar_t	spans[64];
+	wchar_t	spans[256];
 };
 
 /*
--- /sys/include/regexp.h	Mon Oct 26 17:03:31 2009
+++ /sys/include/regexp.h	Mon Oct 26 17:03:29 2009
@@ -27,7 +27,7 @@
  */
 struct Reclass{
 	Rune	*end;
-	Rune	spans[64];
+	Rune	spans[256];
 };
 
 /*