diff --git a/src/cmd/upas/alias/aliasmail.c b/src/cmd/upas/alias/aliasmail.c
new file mode 100644
index 0000000..f50c348
--- /dev/null
+++ b/src/cmd/upas/alias/aliasmail.c
@@ -0,0 +1,281 @@
+#include "common.h"
+
+/*
+ *  WARNING!  This turns all upper case names into lower case
+ *  local ones.
+ */
+
+/* predeclared */
+static String	*getdbfiles(void);
+static int	translate(char*, char**, String*, String*);
+static int	lookup(String**, String*, String*);
+static int	compare(String*, char*);
+static char*	mklower(char*);
+
+static int debug;
+static int from;
+static char *namefiles = "namefiles";
+#define DEBUG if(debug)
+
+/* loop through the names to be translated */
+void
+main(int argc, char *argv[])
+{
+	String *s;
+	String *alias;		/* the alias for the name */
+	char **names;		/* names of this system */
+	String *files;		/* list of files to search */
+	int i, rv;
+	char *p;
+
+	ARGBEGIN {
+	case 'd':
+		debug = 1;
+		break;
+	case 'f':
+		from = 1;
+		break;
+	case 'n':
+		namefiles = ARGF();
+		break;
+	} ARGEND
+	if (chdir(unsharp(UPASLIB)) < 0) {
+		perror("translate(chdir):");
+		exit9(1);
+	}
+
+	/* get environmental info */
+	names = sysnames_read();
+	files = getdbfiles();
+	alias = s_new();
+
+	/* loop through the names to be translated (from standard input) */
+	for(i=0; i<argc; i++) {
+		s = unescapespecial(s_copy(mklower(argv[i])));
+		if(strchr(s_to_c(s), '!') == 0)
+			rv = translate(s_to_c(s), names, files, alias);
+		else
+			rv = -1;
+		if(from){
+			if (rv >= 0 && *s_to_c(alias) != '\0'){
+				p = strchr(s_to_c(alias), '\n');
+				if(p)
+					*p = 0;
+				p = strchr(s_to_c(alias), '!');
+				if(p) {
+					*p = 0;
+					print("%s", s_to_c(alias));
+				} else {
+					p = strchr(s_to_c(alias), '@');
+					if(p)
+						print("%s", p+1);
+					else
+						print("%s", s_to_c(alias));
+				}
+			}
+		} else {
+			if (rv < 0 || *s_to_c(alias) == '\0')
+				print("local!%s\n", s_to_c(s));
+			else {
+				/* this must be a write, not a print */
+				write(1, s_to_c(alias), strlen(s_to_c(alias)));
+			}
+		}
+		s_free(s);
+	}
+	exits(0);
+}
+
+/* get the list of dbfiles to search */
+static String *
+getdbfiles(void)
+{
+	Sinstack *sp;
+	String *files = s_new();
+	char *nf;
+
+	if(from)
+		nf = "fromfiles";
+	else
+		nf = namefiles;
+
+	/* system wide aliases */
+	if ((sp = s_allocinstack(nf)) != 0){
+		while(s_rdinstack(sp, files))
+			s_append(files, " ");
+		s_freeinstack(sp);
+	}
+
+
+	DEBUG print("files are %s\n", s_to_c(files));
+
+	return files;
+}
+
+/* loop through the translation files */
+static int
+translate(char *name,		/* name to translate */
+	char **namev,		/* names of this system */
+	String *files,		/* names of system alias files */
+	String *alias)		/* where to put the alias */
+{
+	String *file = s_new();
+	String **fullnamev;
+	int n, rv;
+
+	rv = -1;
+
+	DEBUG print("translate(%s, %s, %s)\n", name,
+		s_to_c(files), s_to_c(alias));
+
+	/* create the full name to avoid loops (system!name) */
+	for(n = 0; namev[n]; n++)
+		;
+	fullnamev = (String**)malloc(sizeof(String*)*(n+2));
+	n = 0;
+	fullnamev[n++] = s_copy(name);
+	for(; *namev; namev++){
+		fullnamev[n] = s_copy(*namev);
+		s_append(fullnamev[n], "!");
+		s_append(fullnamev[n], name);
+		n++;
+	}
+	fullnamev[n] = 0;
+
+	/* look at system-wide names */
+	s_restart(files);
+	while (s_parse(files, s_restart(file)) != 0) {
+		if (lookup(fullnamev, file, alias)==0) {
+			rv = 0;
+			goto out;
+		}
+	}
+
+out:
+	for(n = 0; fullnamev[n]; n++)
+		s_free(fullnamev[n]);
+	s_free(file);
+	free(fullnamev);
+	return rv;
+}
+
+/*
+ *  very dumb conversion to bang format
+ */
+static String*
+attobang(String *token)
+{
+	char *p;
+	String *tok;
+
+	p = strchr(s_to_c(token), '@');
+	if(p == 0)
+		return token;
+
+	p++;
+	tok = s_copy(p);
+	s_append(tok, "!");
+	s_nappend(tok, s_to_c(token), p - s_to_c(token) - 1);
+
+	return tok;
+}
+
+/*  Loop through the entries in a translation file looking for a match.
+ *  Return 0 if found, -1 otherwise.
+ */
+static int
+lookup(
+	String **namev,
+	String *file,
+	String *alias)	/* returned String */
+{
+	String *line = s_new();
+	String *token = s_new();
+	String *bangtoken;
+	int i, rv = -1;
+	char *name =  s_to_c(namev[0]);
+	Sinstack *sp;
+
+	DEBUG print("lookup(%s, %s, %s, %s)\n", s_to_c(namev[0]), s_to_c(namev[1]),
+		s_to_c(file), s_to_c(alias));
+
+	s_reset(alias);
+	if ((sp = s_allocinstack(s_to_c(file))) == 0)
+		return -1;
+
+	/* look for a match */
+	while (s_rdinstack(sp, s_restart(line))!=0) {
+		DEBUG print("line is %s\n", s_to_c(line));
+		s_restart(token);
+		if (s_parse(s_restart(line), token)==0)
+			continue;
+		if (compare(token, "#include")==0){
+			if(s_parse(line, s_restart(token))!=0) {
+				if(lookup(namev, line, alias) == 0)
+					break;
+			}
+			continue;
+		}
+		if (compare(token, name)!=0)
+			continue;
+		/* match found, get the alias */
+		while(s_parse(line, s_restart(token))!=0) {
+			bangtoken = attobang(token);
+
+			/* avoid definition loops */
+			for(i = 0; namev[i]; i++)
+				if(compare(bangtoken, s_to_c(namev[i]))==0) {
+					s_append(alias, "local");
+					s_append(alias, "!");
+					s_append(alias, name);
+					break;
+				}
+
+			if(namev[i] == 0)
+				s_append(alias, s_to_c(token));
+			s_append(alias, "\n");
+
+			if(bangtoken != token)
+				s_free(bangtoken);
+		}
+		rv = 0;
+		break;
+	}
+	s_free(line);
+	s_free(token);
+	s_freeinstack(sp);
+	return rv;
+}
+
+#define lower(c) ((c)>='A' && (c)<='Z' ? (c)-('A'-'a'):(c))
+
+/* compare two Strings (case insensitive) */
+static int
+compare(String *s1,
+	char *p2)
+{
+	char *p1 = s_to_c(s1);
+	int rv;
+
+	DEBUG print("comparing %s to %s\n", p1, p2);
+	while((rv = lower(*p1) - lower(*p2)) == 0) {
+		if (*p1 == '\0')
+			break;
+		p1++;
+		p2++;
+	}
+	return rv;
+}
+
+static char*
+mklower(char *name)
+{
+	char *p;
+	char c;
+
+	for(p = name; *p; p++){
+		c = *p;
+		*p = lower(c);
+	}
+	return name;
+}
diff --git a/src/cmd/upas/alias/mkfile b/src/cmd/upas/alias/mkfile
new file mode 100644
index 0000000..d7f8f91
--- /dev/null
+++ b/src/cmd/upas/alias/mkfile
@@ -0,0 +1,21 @@
+<$PLAN9/src/mkhdr
+
+TARG=aliasmail
+
+OFILES=aliasmail.$O\
+
+LIB=../common/libcommon.a\
+
+HFILES=../common/common.h\
+	 ../common/sys.h\
+
+
+BIN=$PLAN9/bin/upas
+
+UPDATE=\
+	mkfile\
+	$HFILES\
+	${OFILES:%.$O=%.c}\
+
+<$PLAN9/src/mkone
+CFLAGS=$CFLAGS -I../common
diff --git a/src/cmd/upas/bayes/addhash.c b/src/cmd/upas/bayes/addhash.c
new file mode 100644
index 0000000..6be960f
--- /dev/null
+++ b/src/cmd/upas/bayes/addhash.c
@@ -0,0 +1,66 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include "hash.h"
+
+Hash hash;
+
+void
+usage(void)
+{
+	fprint(2, "addhash [-o out] file scale [file scale]...\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, fd, n;
+	char err[ERRMAX], *out;
+	Biobuf *b, bout;
+
+	out = nil;
+	ARGBEGIN{
+	case 'o':
+		out = EARGF(usage());
+		break;
+	default:
+		usage();
+	}ARGEND;
+
+	if(argc==0 || argc%2)
+		usage();
+
+	while(argc > 0){
+		if((b = Bopenlock(argv[0], OREAD)) == nil)
+			sysfatal("open %s: %r", argv[0]);
+		n = atoi(argv[1]);
+		if(n == 0)
+			sysfatal("0 scale given");
+		Breadhash(b, &hash, n);
+		Bterm(b);
+		argv += 2;
+		argc -= 2;
+	}
+
+	fd = 1;
+	if(out){
+		for(i=0; i<120; i++){
+			if((fd = create(out, OWRITE, 0666|DMEXCL)) >= 0)
+				break;
+			rerrstr(err, sizeof err);
+			if(strstr(err, "file is locked")==nil && strstr(err, "exclusive lock")==nil)
+				break;
+			sleep(1000);
+		}
+		if(fd < 0)
+			sysfatal("could not open %s: %r\n", out);
+	}
+		
+	Binit(&bout, fd, OWRITE);
+	Bwritehash(&bout, &hash);
+	Bterm(&bout);
+	exits(0);
+}
+
diff --git a/src/cmd/upas/bayes/bayes.c b/src/cmd/upas/bayes/bayes.c
new file mode 100644
index 0000000..a040429
--- /dev/null
+++ b/src/cmd/upas/bayes/bayes.c
@@ -0,0 +1,232 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include "hash.h"
+
+enum
+{
+	MAXTAB = 256,
+	MAXBEST = 32,
+};
+
+typedef struct Table Table;
+struct Table
+{
+	char *file;
+	Hash *hash;
+	int nmsg;
+};
+
+typedef struct Word Word;
+struct Word
+{
+	Stringtab *s;	/* from hmsg */
+	int count[MAXTAB];	/* counts from each table */
+	double p[MAXTAB];	/* probabilities from each table */
+	double mp;	/* max probability */
+	int mi;		/* w.p[w.mi] = w.mp */
+};
+
+Table tab[MAXTAB];
+int ntab;
+
+Word best[MAXBEST];
+int mbest;
+int nbest;
+
+int debug;
+
+void
+usage(void)
+{
+	fprint(2, "usage: bayes [-D] [-m maxword] boxhash ... ~ msghash ...\n");
+	exits("usage");
+}
+
+void*
+emalloc(int n)
+{
+	void *v;
+
+	v = mallocz(n, 1);
+	if(v == nil)
+		sysfatal("out of memory");
+	return v;
+}
+
+void
+noteword(Word *w)
+{
+	int i;
+
+	for(i=nbest-1; i>=0; i--)
+		if(w->mp < best[i].mp)
+			break;
+	i++;
+
+	if(i >= mbest)
+		return;
+	if(nbest == mbest)
+		nbest--;
+	if(i < nbest)
+		memmove(&best[i+1], &best[i], (nbest-i)*sizeof(best[0]));
+	best[i] = *w;
+	nbest++;
+}
+
+Hash*
+hread(char *s)
+{
+	Hash *h;
+	Biobuf *b;
+
+	if((b = Bopenlock(s, OREAD)) == nil)
+		sysfatal("open %s: %r", s);
+
+	h = emalloc(sizeof(Hash));
+	Breadhash(b, h, 1);
+	Bterm(b);
+	return h;
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, j, a, mi, oi, tot, keywords;
+	double totp, p, xp[MAXTAB];
+	Hash *hmsg;
+	Word w;
+	Stringtab *s, *t;
+	Biobuf bout;
+
+	mbest = 15;
+	keywords = 0;
+	ARGBEGIN{
+	case 'D':
+		debug = 1;
+		break;
+	case 'k':
+		keywords = 1;
+		break;
+	case 'm':
+		mbest = atoi(EARGF(usage()));
+		if(mbest > MAXBEST)
+			sysfatal("cannot keep more than %d words", MAXBEST);
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	for(i=0; i<argc; i++)
+		if(strcmp(argv[i], "~") == 0)
+			break;
+
+	if(i > MAXTAB)
+		sysfatal("cannot handle more than %d tables", MAXTAB);
+
+	if(i+1 >= argc)
+		usage();
+
+	for(i=0; i<argc; i++){
+		if(strcmp(argv[i], "~") == 0)
+			break;
+		tab[ntab].file = argv[i];
+		tab[ntab].hash = hread(argv[i]);
+		s = findstab(tab[ntab].hash, "*nmsg*", 6, 1);
+		if(s == nil || s->count == 0)
+			tab[ntab].nmsg = 1;
+		else
+			tab[ntab].nmsg = s->count;
+		ntab++;
+	}
+
+	Binit(&bout, 1, OWRITE);
+
+	oi = ++i;
+	for(a=i; a<argc; a++){
+		hmsg = hread(argv[a]);
+		nbest = 0;
+		for(s=hmsg->all; s; s=s->link){
+			w.s = s;
+			tot = 0;
+			totp = 0.0;
+			for(i=0; i<ntab; i++){
+				t = findstab(tab[i].hash, s->str, s->n, 0);
+				if(t == nil)
+					w.count[i] = 0;
+				else
+					w.count[i] = t->count;
+				tot += w.count[i];
+				p = w.count[i]/(double)tab[i].nmsg;
+				if(p >= 1.0)
+					p = 1.0;
+				w.p[i] = p;
+				totp += p;
+			}
+
+			if(tot < 5){		/* word does not appear enough; give to box 0 */
+				w.p[0] = 0.5;
+				for(i=1; i<ntab; i++)
+					w.p[i] = 0.1;
+				w.mp = 0.5;
+				w.mi = 0;
+				noteword(&w);
+				continue;
+			}
+
+			w.mp = 0.0;
+			for(i=0; i<ntab; i++){
+				p = w.p[i];
+				p /= totp;
+				if(p < 0.01)
+					p = 0.01;
+				else if(p > 0.99)
+					p = 0.99;
+				if(p > w.mp){
+					w.mp = p;
+					w.mi = i;
+				}
+				w.p[i] = p;
+			}
+			noteword(&w);
+		}
+
+		totp = 0.0;
+		for(i=0; i<ntab; i++){
+			p = 1.0;
+			for(j=0; j<nbest; j++)
+				p *= best[j].p[i];
+			xp[i] = p;
+			totp += p;
+		}
+		for(i=0; i<ntab; i++)
+			xp[i] /= totp;
+		mi = 0;
+		for(i=1; i<ntab; i++)
+			if(xp[i] > xp[mi])
+				mi = i;
+		if(oi != argc-1)
+			Bprint(&bout, "%s: ", argv[a]);
+		Bprint(&bout, "%s %f", tab[mi].file, xp[mi]);
+		if(keywords){
+			for(i=0; i<nbest; i++){
+				Bprint(&bout, " ");
+				Bwrite(&bout, best[i].s->str, best[i].s->n);
+				Bprint(&bout, " %f", best[i].p[mi]);
+			}
+		}
+		freehash(hmsg);
+		Bprint(&bout, "\n");
+		if(debug){
+			for(i=0; i<nbest; i++){
+				Bwrite(&bout, best[i].s->str, best[i].s->n);
+				Bprint(&bout, " %f", best[i].p[mi]);
+				if(best[i].p[mi] < best[i].mp)
+					Bprint(&bout, " (%f %s)", best[i].mp, tab[best[i].mi].file);
+				Bprint(&bout, "\n");
+			}
+		}
+	}
+	Bterm(&bout);
+}
diff --git a/src/cmd/upas/bayes/classify.re b/src/cmd/upas/bayes/classify.re
new file mode 100644
index 0000000..b1dd8b2
--- /dev/null
+++ b/src/cmd/upas/bayes/classify.re
@@ -0,0 +1,403 @@
+# dreprog
+7 27 0 6 0 6
+0 1 1 0 0
+1 0 1 0 0
+0 0 5 0 0 32 1 33 0 65568 1 65569 0
+0 0 5 0 0 109 2 110 0 65645 2 65646 0
+0 0 5 0 0 111 3 112 0 65647 3 65648 0
+0 0 5 0 0 114 4 115 0 65650 4 65651 0
+0 0 5 0 0 70 5 71 0 65606 5 65607 0
+# dreprog
+5 74 0 0 0 0
+0 0 20 0 2 33 1 34 2 39 1 40 2 48 4 58 2 65 1 123 2 161 1 65536 2 65569 1 65570 2 65575 1 65576 2 65584 4 65594 2 65601 1 65659 2 65697 1
+1 0 20 0 2 33 1 34 2 39 1 40 2 48 4 58 2 65 1 123 2 161 1 65536 2 65569 1 65570 2 65575 1 65576 2 65584 4 65594 2 65601 1 65659 2 65697 1
+0 1 1 0 2
+0 0 5 0 2 48 4 58 2 65584 4 65594 2
+1 0 28 0 2 33 1 34 2 39 1 40 2 44 3 45 2 46 3 47 2 48 4 58 2 65 1 123 2 161 1 65536 2 65569 1 65570 2 65575 1 65576 2 65580 3 65581 2 65582 3 65583 2 65584 4 65594 2 65601 1 65659 2 65697 1
+# dreprog
+385 9817 0 319 0 319
+0 0 41 0 1 60 320 61 1 66 321 67 1 69 322 70 323 71 1 78 324 79 1 83 325 84 1 98 321 99 1 101 322 102 323 103 1 110 324 111 1 115 325 116 1 65596 320 65597 1 65602 321 65603 1 65605 322 65606 323 65607 1 65614 324 65615 1 65619 325 65620 1 65634 321 65635 1 65637 322 65638 323 65639 1 65646 324 65647 1 65651 325 65652 1
+1 0 1 0 2
+0 1 1 0 2
+1 0 5 0 2 33 38 91 2 65569 3 65627 2
+1 0 25 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 91 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65627 5 65659 2
+1 0 21 0 2 43 40 44 2 45 40 46 2 47 40 58 2 61 40 62 2 65 40 123 2 65579 5 65580 2 65581 5 65582 2 65583 5 65594 2 65597 5 65598 2 65601 5 65659 2
+1 0 33 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 79 48 80 39 91 40 111 54 112 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65615 15 65616 4 65627 5 65647 22 65648 5 65659 2
+1 0 25 0 344 9 87 10 32 11 344 13 87 14 344 32 87 33 349 45 45 46 349 62 38 63 349 91 344 65545 87 65546 32 65547 344 65549 87 65550 344 65568 87 65569 49 65581 51 65582 49 65598 3 65599 49 65627 344
+1 0 39 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 55 66 39 69 58 70 39 91 40 97 348 98 40 101 351 102 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 56 65602 4 65605 62 65606 4 65627 5 65633 343 65634 5 65637 64 65638 5 65659 2
+1 0 33 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 83 59 84 39 91 40 115 352 116 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65619 14 65620 4 65627 5 65651 342 65652 5 65659 2
+1 0 33 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 73 66 74 39 91 40 105 68 106 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65609 63 65610 4 65627 5 65641 24 65642 5 65659 2
+1 0 33 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 78 69 79 39 91 40 110 67 111 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65614 70 65615 4 65627 5 65646 65 65647 5 65659 2
+1 0 33 0 2 33 38 43 39 44 38 45 39 46 38 47 39 58 38 61 39 62 38 65 39 69 71 70 39 91 40 101 72 102 40 123 2 65569 3 65579 4 65580 3 65581 4 65582 3 65583 4 65594 3 65597 4 65598 3 65601 4 65605 331 65606 4 65627 5 65637 74 65638 5 65659 2
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diff --git a/src/cmd/upas/bayes/dfa.c b/src/cmd/upas/bayes/dfa.c
new file mode 100644
index 0000000..46695ef
--- /dev/null
+++ b/src/cmd/upas/bayes/dfa.c
@@ -0,0 +1,800 @@
+#include <u.h>
+#include <libc.h>
+#include <bin.h>
+#include <bio.h>
+#include <regexp.h>
+#include "/sys/src/libregexp/regcomp.h"
+#include "dfa.h"
+
+void rdump(Reprog*);
+void dump(Dreprog*);
+
+/*
+ * Standard NFA determinization and DFA minimization.
+ */
+typedef struct Deter Deter;
+typedef struct Reiset Reiset;
+
+void ddump(Deter*);
+
+/* state of determinization */
+struct Deter
+{
+	jmp_buf kaboom;	/* jmp on error */
+
+	Bin *bin;		/* bin for temporary allocations */
+
+	Reprog *p;	/* program being determinized */
+	uint ninst;		/* number of instructions in program */
+
+	Reiset *alloc;	/* chain of all Reisets */
+	Reiset **last;
+
+	Reiset **hash;	/* hash of all Reisets */
+	uint nhash;
+
+	Reiset *tmp;	/* temporaries for walk */
+	uchar *bits;
+
+	Rune *c;		/* ``interesting'' characters */
+	uint nc;
+};
+
+/* set of Reinsts: perhaps we should use a bit list instead of the indices? */
+struct Reiset
+{
+	uint *inst;		/* indices of instructions in set */
+	uint ninst;		/* size of set */
+
+	Reiset *next;	/* d.alloc chain */
+	Reiset *hash;	/* d.hash chain */
+	Reiset **delta;	/* where to go on each interesting char */
+	uint id;		/* assigned id during minimization */
+	uint isfinal;	/* is an accepting (final) state */
+};
+
+static Reiset*
+ralloc(Deter *d, int ninst)
+{
+	Reiset *t;
+
+	t = binalloc(&d->bin, sizeof(Reiset)+2*d->nc*sizeof(Reiset*)+sizeof(uint)*ninst, 0);
+	if(t == nil)
+		longjmp(d->kaboom, 1);
+	t->delta = (Reiset**)&t[1];
+	t->inst = (uint*)&t->delta[2*d->nc];
+	return t;
+}
+
+/* find the canonical form a given Reiset */
+static Reiset*
+findreiset(Deter *d, Reiset *s)
+{
+	int i, szinst;
+	uint h;
+	Reiset *t;
+
+	h = 0;
+	for(i=0; i<s->ninst; i++)
+		h = h*1000003 + s->inst[i];
+	h %= d->nhash;
+
+	szinst = s->ninst*sizeof(s->inst[0]);
+	for(t=d->hash[h]; t; t=t->hash)
+		if(t->ninst==s->ninst && memcmp(t->inst, s->inst, szinst)==0)
+			return t;
+
+	t = ralloc(d, s->ninst);
+	t->hash = d->hash[h];
+	d->hash[h] = t;
+
+	*d->last = t;
+	d->last = &t->next;
+	t->next = 0;
+
+	t->ninst = s->ninst;
+	memmove(t->inst, s->inst, szinst);
+
+	/* delta is filled in later */
+
+	return t;
+}
+
+/* convert bits to a real reiset */
+static Reiset*
+bits2reiset(Deter *d, uchar *bits)
+{
+	int k;
+	Reiset *s;
+
+	s = d->tmp;
+	s->ninst = 0;
+	for(k=0; k<d->ninst; k++)
+		if(bits[k])
+			s->inst[s->ninst++] = k;
+	return findreiset(d, s);
+}
+
+/* add n to state set; if n < k, need to go around again */
+static int
+add(int n, uchar *bits, int k)
+{
+	if(bits[n])
+		return 0;
+	bits[n] = 1;
+	return n < k;
+}
+
+/* update bits to follow all the empty (non-character-related) transitions possible */
+static void
+followempty(Deter *d, uchar *bits, int bol, int eol)
+{
+	int again, k;
+	Reinst *i;
+
+	do{
+		again = 0;
+		for(i=d->p->firstinst, k=0; k < d->ninst; i++, k++){
+			if(!bits[k])
+				continue;
+			switch(i->type){
+			case RBRA:
+			case LBRA:
+				again |= add(i->next - d->p->firstinst, bits, k);
+				break;
+			case OR:
+				again |= add(i->left - d->p->firstinst, bits, k);
+				again |= add(i->right - d->p->firstinst, bits, k);
+				break;
+			case BOL:
+				if(bol)
+					again |= add(i->next - d->p->firstinst, bits, k);
+				break;
+			case EOL:
+				if(eol)
+					again |= add(i->next - d->p->firstinst, bits, k);
+				break;
+			}
+		}
+	}while(again);
+
+	/*
+	 * Clear bits for useless transitions.  We could do this during
+	 * the switch above, but then we have no guarantee of termination
+	 * if we get a loop in the regexp.
+	 */
+	for(i=d->p->firstinst, k=0; k < d->ninst; i++, k++){
+		if(!bits[k])
+			continue;
+		switch(i->type){
+		case RBRA:
+		case LBRA:
+		case OR:
+		case BOL:
+		case EOL:
+			bits[k] = 0;
+			break;
+		}
+	}
+}
+
+/*
+ * Where does s go if it sees rune r?
+ * Eol is true if a $ matches the string at the position just after r.
+ */
+static Reiset*
+transition(Deter *d, Reiset *s, Rune r, uint eol)
+{
+	int k;
+	uchar *bits;
+	Reinst *i, *inst0;
+	Rune *rp, *ep;
+
+	bits = d->bits;
+	memset(bits, 0, d->ninst);
+
+	inst0 = d->p->firstinst;
+	for(k=0; k < s->ninst; k++){
+		i = inst0 + s->inst[k];
+		switch(i->type){
+		default:
+			werrstr("bad reprog: got type %d", i->type);
+			longjmp(d->kaboom, 1);
+		case RBRA:
+		case LBRA:
+		case OR:
+		case BOL:
+		case EOL:
+			werrstr("internal error: got type %d", i->type);
+			longjmp(d->kaboom, 1);
+
+		case RUNE:
+			if(r == i->r)
+				bits[i->next - inst0] = 1;
+			break;
+		case ANY:
+			if(r != L'\n')
+				bits[i->next - inst0] = 1;
+			break;
+		case ANYNL:
+			bits[i->next - inst0] = 1;
+			break;
+		case NCCLASS:
+			if(r == L'\n')
+				break;
+			/* fall through */
+		case CCLASS:
+			ep = i->cp->end;
+			for(rp = i->cp->spans; rp < ep; rp += 2)
+				if(rp[0] <= r && r <= rp[1])
+					break;
+			if((rp < ep) ^! (i->type == CCLASS))
+				bits[i->next - inst0] = 1;
+			break;
+		case END:
+			break;
+		}
+	}
+
+	followempty(d, bits, r=='\n', eol);
+	return bits2reiset(d, bits);
+}
+
+static int
+countinst(Reprog *pp)
+{
+	int n;
+	Reinst *l;
+
+	n = 0;
+	l = pp->firstinst;
+	while(l++->type)
+		n++;
+	return n;
+}
+
+static void
+set(Deter *d, u32int **tab, Rune r)
+{
+	u32int *u;
+
+	if((u = tab[r/4096]) == nil){
+		u = binalloc(&d->bin, 4096/8, 1);
+		if(u == nil)
+			longjmp(d->kaboom, 1);
+		tab[r/4096] = u;
+	}
+	u[(r%4096)/32] |= 1<<(r%32);
+}
+
+/*
+ * Compute the list of important characters. 
+ * Other characters behave like the ones that surround them.
+ */
+static void
+findchars(Deter *d, Reprog *p)
+{
+	u32int *tab[65536/4096], *u, x;
+	Reinst *i;
+	Rune *rp, *ep;
+	int k, m, n, a;
+
+	memset(tab, 0, sizeof tab);
+	set(d, tab, 0);
+	set(d, tab, 0xFFFF);
+	for(i=p->firstinst; i->type; i++){
+		switch(i->type){
+		case ANY:
+			set(d, tab, L'\n'-1);
+			set(d, tab, L'\n');
+			set(d, tab, L'\n'+1);
+			break;
+		case RUNE:
+			set(d, tab, i->r-1);
+			set(d, tab, i->r);
+			set(d, tab, i->r+1);
+			break;
+		case NCCLASS:
+			set(d, tab, L'\n'-1);
+			set(d, tab, L'\n');
+			set(d, tab, L'\n'+1);
+			/* fall through */
+		case CCLASS:
+			ep = i->cp->end;
+			for(rp = i->cp->spans; rp < ep; rp += 2){
+				set(d, tab, rp[0]-1);
+				set(d, tab, rp[0]);
+				set(d, tab, rp[1]);
+				set(d, tab, rp[1]+1);
+			}
+			break;
+		}
+	}
+
+	n = 0;
+	for(k=0; k<nelem(tab); k++){
+		if((u = tab[k]) == nil)
+			continue;
+		for(m=0; m<4096/32; m++){
+			if((x = u[m]) == 0)
+				continue;
+			for(a=0; a<32; a++)
+				if(x&(1<<a))
+					n++;
+		}
+	}
+
+	d->c = binalloc(&d->bin, (n+1)*sizeof(Rune), 0);
+	if(d->c == 0)
+		longjmp(d->kaboom, 1);
+	d->nc = n;
+
+	n = 0;
+	for(k=0; k<nelem(tab); k++){
+		if((u = tab[k]) == nil)
+			continue;
+		for(m=0; m<4096/32; m++){
+			if((x = u[m]) == 0)
+				continue;
+			for(a=0; a<32; a++)
+				if(x&(1<<a))
+					d->c[n++] = k*4096+m*32+a;
+		}
+	}
+
+	d->c[n] = 0;
+	if(n != d->nc)
+		abort();
+}
+
+/*
+ * convert the Deter and Reisets into a Dreprog.
+ * if dp and c are nil, just return the count of Drecases needed.
+ */
+static int
+buildprog(Deter *d, Reiset **id2set, int nid, Dreprog *dp, Drecase *c)
+{
+	int i, j, id, n, nn;
+	Dreinst *di;
+	Reiset *s;
+
+	nn = 0;
+	di = 0;
+	for(i=0; i<nid; i++){
+		s = id2set[i];
+		if(c){
+			di = &dp->inst[i];
+			di->isfinal = s->isfinal;
+		}
+		n = 0;
+		id = -1;
+		for(j=0; j<2*d->nc; j++){
+			if(s->delta[j]->id != id){
+				id = s->delta[j]->id;
+				if(c){
+					c[n].start = ((j/d->nc)<<16) | d->c[j%d->nc];
+					c[n].next = &dp->inst[id];
+				}
+				n++;
+			}
+		}
+		if(c){
+			if(n == 1 && c[0].next == di)
+				di->isloop = 1;
+			di->c = c;
+			di->nc = n;
+			c += n;
+		}
+		nn += n;
+	}
+	return nn;
+}
+
+Dreprog*
+dregcvt(Reprog *p)
+{
+	uchar *bits;
+	uint again, n, nid, id;
+	Deter d;
+	Reiset **id2set, *s, *t, *start[4];
+	Dreprog *dp;
+	Drecase *c;
+
+	memset(&d, 0, sizeof d);
+
+	if(setjmp(d.kaboom)){
+		binfree(&d.bin);
+		return nil;
+	}
+
+	d.p = p;
+	d.ninst = countinst(p);
+
+	d.last = &d.alloc;
+
+	n = d.ninst;
+	/* round up to power of two; this loop is the least of our efficiency problems */
+	while(n&(n-1))
+		n++;
+	d.nhash = n;
+	d.hash = binalloc(&d.bin, d.nhash*sizeof(Reinst*), 1);
+
+	/* get list of important runes */
+	findchars(&d, p);
+
+#ifdef DUMP
+	print("relevant chars are: «%S»\n", d.c+1);
+#endif
+
+	d.bits = bits = binalloc(&d.bin, d.ninst, 0);
+	d.tmp = ralloc(&d, d.ninst);
+
+	/*
+	 * Convert to DFA
+	 */
+
+	/* 4 start states, depending on initial bol, eol */
+	for(n=0; n<4; n++){
+		memset(bits, 0, d.ninst);
+		bits[p->startinst - p->firstinst] = 1;
+		followempty(&d, bits, n&1, n&2);
+		start[n] = bits2reiset(&d, bits);
+	}
+
+	/* explore the reiset space */
+	for(s=d.alloc; s; s=s->next)
+		for(n=0; n<2*d.nc; n++)
+			s->delta[n] = transition(&d, s, d.c[n%d.nc], n/d.nc);
+
+#ifdef DUMP
+	nid = 0;
+	for(s=d.alloc; s; s=s->next)
+		s->id = nid++;
+	ddump(&d);
+#endif
+
+	/*
+	 * Minimize.
+	 */
+
+	/* first class division is final or not */
+	for(s=d.alloc; s; s=s->next){
+		s->isfinal = 0;
+		for(n=0; n<s->ninst; n++)
+			if(p->firstinst[s->inst[n]].type == END)
+				s->isfinal = 1;
+		s->id = s->isfinal;
+	}
+
+	/* divide states with different transition tables in id space */
+	nid = 2;
+	do{
+		again = 0;
+		for(s=d.alloc; s; s=s->next){
+			id = -1;
+			for(t=s->next; t; t=t->next){
+				if(s->id != t->id)
+					continue;
+				for(n=0; n<2*d.nc; n++){
+					/* until we finish the for(t) loop, s->id and id are same */
+					if((s->delta[n]->id == t->delta[n]->id)
+					|| (s->delta[n]->id == s->id && t->delta[n]->id == id)
+					|| (s->delta[n]->id == id && t->delta[n]->id == s->id))
+						continue;
+					break;
+				}
+				if(n == 2*d.nc)
+					continue;
+				if(id == -1)
+					id = nid++;
+				t->id = id;
+				again = 1;
+			}
+		}
+	}while(again);
+
+#ifdef DUMP
+	ddump(&d);
+#endif
+
+	/* build dreprog */
+	id2set = binalloc(&d.bin, nid*sizeof(Reiset*), 1);
+	if(id2set == nil)
+		longjmp(d.kaboom, 1);
+	for(s=d.alloc; s; s=s->next)
+		id2set[s->id] = s;
+
+	n = buildprog(&d, id2set, nid, nil, nil);
+	dp = mallocz(sizeof(Dreprog)+nid*sizeof(Dreinst)+n*sizeof(Drecase), 1);
+	if(dp == nil)
+		longjmp(d.kaboom, 1);
+	c = (Drecase*)&dp->inst[nid];
+	buildprog(&d, id2set, nid, dp, c);
+
+	for(n=0; n<4; n++)
+		dp->start[n] = &dp->inst[start[n]->id];
+	dp->ninst = nid;
+
+	binfree(&d.bin);
+	return dp;
+}
+
+int
+dregexec(Dreprog *p, char *s, int bol)
+{
+	Rune r;
+	ulong rr;
+	Dreinst *i;
+	Drecase *c, *ec;
+	int best, n;
+	char *os;
+
+	i = p->start[(bol ? 1 : 0) | (s[1]=='\n' ? 2 : 0)];
+	best = -1;
+	os = s;
+	for(; *s; s+=n){
+		if(i->isfinal)
+			best = s - os;
+		if(i->isloop){
+			if(i->isfinal)
+				return strlen(os);
+			else
+				return best;
+		}
+		if((*s&0xFF) < Runeself){
+			r = *s;
+			n = 1;
+		}else
+			n = chartorune(&r, s);
+		c = i->c;
+		ec = c+i->nc;
+		rr = r;
+		if(s[n] == '\n' || s[n] == '\0')
+			rr |= 0x10000;
+		for(; c<ec; c++){
+			if(c->start > rr){
+				i = c[-1].next;
+				goto Out;
+			}
+		}
+		i = ec[-1].next;
+	Out:;
+	}
+	if(i->isfinal)
+		best = s - os;
+	return best;
+}
+
+
+#ifdef DUMP
+void
+ddump(Deter *d)
+{
+	int i, id;
+	Reiset *s;
+
+	for(s=d->alloc; s; s=s->next){
+		print("%d ", s->id);
+		id = -1;
+		for(i=0; i<2*d->nc; i++){
+			if(id != s->delta[i]->id){
+				if(i==0)
+					print(" [");
+				else if(i/d->nc)
+					print(" [%C$", d->c[i%d->nc]);
+				else
+					print(" [%C", d->c[i%d->nc]);
+				print(" %d]", s->delta[i]->id);
+				id = s->delta[i]->id;
+			}
+		}
+		print("\n");
+	}
+}
+
+void
+rdump(Reprog *pp)
+{
+	Reinst *l;
+	Rune *p;
+
+	l = pp->firstinst;
+	do{
+		print("%ld:\t0%o\t%ld\t%ld", l-pp->firstinst, l->type,
+			l->left-pp->firstinst, l->right-pp->firstinst);
+		if(l->type == RUNE)
+			print("\t%C\n", l->r);
+		else if(l->type == CCLASS || l->type == NCCLASS){
+			print("\t[");
+			if(l->type == NCCLASS)
+				print("^");
+			for(p = l->cp->spans; p < l->cp->end; p += 2)
+				if(p[0] == p[1])
+					print("%C", p[0]);
+				else
+					print("%C-%C", p[0], p[1]);
+			print("]\n");
+		} else
+			print("\n");
+	}while(l++->type);
+}
+
+void
+dump(Dreprog *pp)
+{
+	int i, j;
+	Dreinst *l;
+
+	print("start %ld %ld %ld %ld\n",
+		pp->start[0]-pp->inst,
+		pp->start[1]-pp->inst,
+		pp->start[2]-pp->inst,
+		pp->start[3]-pp->inst);
+
+	for(i=0; i<pp->ninst; i++){
+		l = &pp->inst[i];
+		print("%d:", i);
+		for(j=0; j<l->nc; j++){
+			print(" [");
+			if(j == 0)
+				if(l->c[j].start != 1)
+					abort();
+			if(j != 0)
+				print("%C%s", l->c[j].start&0xFFFF, (l->c[j].start&0x10000) ? "$" : "");
+			print("-");
+			if(j != l->nc-1)
+				print("%C%s", (l->c[j+1].start&0xFFFF)-1, (l->c[j+1].start&0x10000) ? "$" : "");
+			print("] %ld", l->c[j].next - pp->inst);
+		}
+		if(l->isfinal)
+			print(" final");
+		if(l->isloop)
+			print(" loop");
+		print("\n");
+	}
+}
+
+
+void
+main(int argc, char **argv)
+{
+	int i;
+	Reprog *p;
+	Dreprog *dp;
+
+	i = 1;
+		p = regcomp(argv[i]);
+		if(p == 0){
+			print("=== %s: bad regexp\n", argv[i]);
+		}
+	//	print("=== %s\n", argv[i]);
+	//	rdump(p);
+		dp = dregcvt(p);
+		print("=== dfa\n");
+		dump(dp);
+	
+	for(i=2; i<argc; i++)
+		print("match %d\n", dregexec(dp, argv[i], 0));
+	exits(0);
+}
+#endif
+
+void
+Bprintdfa(Biobuf *b, Dreprog *p)
+{
+	int i, j, nc;
+
+	Bprint(b, "# dreprog\n");
+	nc = 0;
+	for(i=0; i<p->ninst; i++)
+		nc += p->inst[i].nc;
+	Bprint(b, "%d %d %ld %ld %ld %ld\n", p->ninst, nc,
+		p->start[0]-p->inst, p->start[1]-p->inst,
+		p->start[2]-p->inst, p->start[3]-p->inst);
+	for(i=0; i<p->ninst; i++){
+		Bprint(b, "%d %d %d", p->inst[i].isfinal, p->inst[i].isloop, p->inst[i].nc);
+		for(j=0; j<p->inst[i].nc; j++)
+			Bprint(b, " %d %ld", p->inst[i].c[j].start, p->inst[i].c[j].next-p->inst);
+		Bprint(b, "\n");
+	}
+}
+
+static char*
+egetline(Biobuf *b, int c, jmp_buf jb)
+{
+	char *p;
+
+	p = Brdline(b, c);
+	if(p == nil)
+		longjmp(jb, 1);
+	p[Blinelen(b)-1] = '\0';
+	return p;
+}
+
+static void
+egetc(Biobuf *b, int c, jmp_buf jb)
+{
+	if(Bgetc(b) != c)
+		longjmp(jb, 1);
+}
+
+static int
+egetnum(Biobuf *b, int want, jmp_buf jb)
+{
+	int c;
+	int n, first;
+
+	n = 0;
+	first = 1;
+	while((c = Bgetc(b)) != Beof){
+		if(c < '0' || c > '9'){
+			if(want == 0){
+				Bungetc(b);
+				c = 0;
+			}
+			if(first || c != want){
+				werrstr("format error");
+				longjmp(jb, 1);
+			}
+			return n;
+		}
+		n = n*10 + c - '0';
+		first = 0;
+	}
+	werrstr("unexpected eof");
+	longjmp(jb, 1);
+	return -1;
+}
+
+Dreprog*
+Breaddfa(Biobuf *b)
+{
+	char *s;
+	int ninst, nc;
+	jmp_buf jb;
+	Dreprog *p;
+	Drecase *c;
+	Dreinst *l;
+	int j, k;
+
+	p = nil;
+	if(setjmp(jb)){
+		free(p);
+		return nil;
+	}
+
+	s = egetline(b, '\n', jb);
+	if(strcmp(s, "# dreprog") != 0){
+		werrstr("format error");
+		longjmp(jb, 1);
+	}
+
+	ninst = egetnum(b, ' ', jb);
+	nc = egetnum(b, ' ', jb);
+
+	p = mallocz(sizeof(Dreprog)+ninst*sizeof(Dreinst)+nc*sizeof(Drecase), 1);
+	if(p == nil)
+		longjmp(jb, 1);
+	c = (Drecase*)&p->inst[ninst];
+
+	p->start[0] = &p->inst[egetnum(b, ' ', jb)];
+	p->start[1] = &p->inst[egetnum(b, ' ', jb)];
+	p->start[2] = &p->inst[egetnum(b, ' ', jb)];
+	p->start[3] = &p->inst[egetnum(b, '\n', jb)];
+
+	for(j=0; j<ninst; j++){
+		l = &p->inst[j];
+		l->isfinal = egetnum(b, ' ', jb);
+		l->isloop = egetnum(b, ' ', jb);
+		l->nc = egetnum(b, 0, jb);
+		l->c = c;
+		for(k=0; k<l->nc; k++){
+			egetc(b, ' ', jb);
+			c->start = egetnum(b, ' ', jb);
+			c->next = &p->inst[egetnum(b, 0, jb)];
+			c++;
+		}
+		egetc(b, '\n', jb);
+	}
+	return p;
+}
diff --git a/src/cmd/upas/bayes/dfa.h b/src/cmd/upas/bayes/dfa.h
new file mode 100644
index 0000000..28c43db
--- /dev/null
+++ b/src/cmd/upas/bayes/dfa.h
@@ -0,0 +1,33 @@
+/*
+ * Deterministic regexp program.
+ */
+typedef struct Dreprog Dreprog;
+typedef struct Dreinst Dreinst;
+typedef struct Drecase Drecase;
+
+struct Dreinst
+{
+	int isfinal;
+	int isloop;
+	Drecase *c;
+	int nc;
+};
+
+struct Dreprog
+{
+	Dreinst *start[4];
+	int ninst;
+	Dreinst inst[1];
+};
+
+struct Drecase
+{
+	uint start;
+	Dreinst *next;
+};
+
+Dreprog* dregcvt(Reprog*);
+int dregexec(Dreprog*, char*, int);
+Dreprog* Breaddfa(Biobuf *b);
+void Bprintdfa(Biobuf*, Dreprog*);
+
diff --git a/src/cmd/upas/bayes/dump.c b/src/cmd/upas/bayes/dump.c
new file mode 100644
index 0000000..9c7babd
--- /dev/null
+++ b/src/cmd/upas/bayes/dump.c
@@ -0,0 +1,67 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include "/sys/src/libregexp/regcomp.h"
+#include "dfa.h"
+
+#define DUMP
+
+void
+dump(Dreprog *pp)
+{
+	int i, j;
+	Dreinst *l;
+
+	print("start %ld %ld %ld %ld\n",
+		pp->start[0]-pp->inst,
+		pp->start[1]-pp->inst,
+		pp->start[2]-pp->inst,
+		pp->start[3]-pp->inst);
+
+	for(i=0; i<pp->ninst; i++){
+		l = &pp->inst[i];
+		print("%d:", i);
+		for(j=0; j<l->nc; j++){
+			print(" [");
+			if(j == 0)
+				if(l->c[j].start > 1)
+					print("<bad start %d>\n", l->c[j].start);
+			if(j != 0)
+				print("%C%s", l->c[j].start&0xFFFF, (l->c[j].start&0x10000) ? "$" : "");
+			print("-");
+			if(j != l->nc-1)
+				print("%C%s", (l->c[j+1].start&0xFFFF)-1, (l->c[j+1].start&0x10000) ? "$" : "");
+			print("] %ld", l->c[j].next - pp->inst);
+		}
+		if(l->isfinal)
+			print(" final");
+		if(l->isloop)
+			print(" loop");
+		print("\n");
+	}
+}
+
+
+void
+main(int argc, char **argv)
+{
+	int i;
+	Reprog *p;
+	Dreprog *dp;
+
+	i = 1;
+		p = regcomp(argv[i]);
+		if(p == 0){
+			print("=== %s: bad regexp\n", argv[i]);
+		}
+	//	print("=== %s\n", argv[i]);
+	//	rdump(p);
+		dp = dregcvt(p);
+		print("=== dfa\n");
+		dump(dp);
+	
+	for(i=2; i<argc; i++)
+		print("match %d\n", dregexec(dp, argv[i], 1));
+	exits(0);
+}
diff --git a/src/cmd/upas/bayes/hash.c b/src/cmd/upas/bayes/hash.c
new file mode 100644
index 0000000..1d0d0ac
--- /dev/null
+++ b/src/cmd/upas/bayes/hash.c
@@ -0,0 +1,312 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "hash.h"
+
+/***
+ * String hash tables.
+ */
+
+Stringtab *tfree;
+
+Stringtab*
+taballoc(void)
+{
+	static Stringtab *t;
+	static uint nt;
+
+	if(tfree){
+		Stringtab *tt = tfree;
+		tfree = tt->link;
+		return tt;
+	}
+
+	if(nt == 0){
+		t = malloc(64000*sizeof(Stringtab));
+		if(t == 0)
+			sysfatal("out of memory");
+		nt = 64000;
+	}
+	nt--;
+	return t++;
+}
+
+void
+tabfree(Stringtab *tt)
+{
+	tt->link = tfree;
+	tfree = tt;
+}
+
+char*
+xstrdup(char *s, int len)
+{
+	char *r;
+	static char *t;
+	static int nt;
+
+	if(nt < len){
+		t = malloc(512*1024+len);
+		if(t == 0)
+			sysfatal("out of memory");
+		nt = 512*1024;
+	}
+	r = t;
+	t += len;
+	nt -= len;
+	memmove(r, s, len);
+	return r;
+}
+
+static uint
+hash(char *s, int n)
+{
+	uint h;
+	uchar *p, *ep;
+	h = 0;
+	for(p=(uchar*)s, ep=p+n; p<ep; p++)
+		h = h*37 + *p;
+	return h;
+}
+
+static void
+rehash(Hash *hh)
+{
+	int h;
+	Stringtab *s;
+
+	if(hh->nstab == 0)
+		hh->nstab = 1024;
+	else
+		hh->nstab = hh->ntab*2;
+
+	free(hh->stab);
+	hh->stab = mallocz(hh->nstab*sizeof(Stringtab*), 1);
+	if(hh->stab == nil)
+		sysfatal("out of memory");
+
+	for(s=hh->all; s; s=s->link){
+		h = hash(s->str, s->n) % hh->nstab;
+		s->hash = hh->stab[h];
+		hh->stab[h] = s;
+	}
+}
+
+Stringtab*
+findstab(Hash *hh, char *str, int n, int create)
+{
+	uint h;
+	Stringtab *tab, **l;
+
+	if(hh->nstab == 0)
+		rehash(hh);
+
+	h = hash(str, n) % hh->nstab;
+	for(tab=hh->stab[h], l=&hh->stab[h]; tab; l=&tab->hash, tab=tab->hash)
+		if(n==tab->n && memcmp(str, tab->str, n) == 0){
+			*l = tab->hash;
+			tab->hash = hh->stab[h];
+			hh->stab[h] = tab;
+			return tab;
+		}
+
+	if(!create)
+		return nil;
+
+	hh->sorted = 0;
+	tab = taballoc();
+	tab->str = xstrdup(str, n);
+	tab->hash = hh->stab[h];
+	tab->link = hh->all;
+	hh->all = tab;
+	tab->n = n;
+	tab->count = 0;
+	tab->date = 0;
+	hh->stab[h] = tab;
+
+	hh->ntab++;
+	if(hh->ntab > 2*hh->nstab && !(hh->ntab&(hh->ntab-1)))
+		rehash(hh);
+	return tab;
+}
+
+int
+scmp(Stringtab *a, Stringtab *b)
+{
+	int n, x;
+
+	if(a == 0)
+		return 1;
+	if(b == 0)
+		return -1;
+	n = a->n;
+	if(n > b->n)
+		n = b->n;
+	x = memcmp(a->str, b->str, n);
+	if(x != 0)
+		return x;
+	if(a->n < b->n)
+		return -1;
+	if(a->n > b->n)
+		return 1;
+	return 0;	/* shouldn't happen */
+}
+
+Stringtab*
+merge(Stringtab *a, Stringtab *b)
+{
+	Stringtab *s, **l;
+
+	l = &s;
+	while(a || b){
+		if(scmp(a, b) < 0){
+			*l = a;
+			l = &a->link;
+			a = a->link;
+		}else{
+			*l = b;
+			l = &b->link;
+			b = b->link;
+		}
+	}
+	*l = 0;
+	return s;
+}
+
+Stringtab*
+mergesort(Stringtab *s)
+{
+	Stringtab *a, *b;
+	int delay;
+
+	if(s == nil)
+		return nil;
+	if(s->link == nil)
+		return s;
+
+	a = b = s;
+	delay = 1;
+	while(a && b){
+		if(delay)	/* easy way to handle 2-element list */
+			delay = 0;
+		else
+			a = a->link;
+		if(b = b->link)
+			b = b->link;
+	}
+
+	b = a->link;
+	a->link = nil;
+
+	a = mergesort(s);
+	b = mergesort(b);
+
+	return merge(a, b);
+}
+
+Stringtab*
+sortstab(Hash *hh)
+{
+	if(!hh->sorted){
+		hh->all = mergesort(hh->all);
+		hh->sorted = 1;
+	}
+	return hh->all;
+}
+
+int
+Bwritehash(Biobuf *b, Hash *hh)
+{
+	Stringtab *s;
+	int now;
+
+	now = time(0);
+	s = sortstab(hh);
+	Bprint(b, "# hash table\n");
+	for(; s; s=s->link){
+		if(s->count <= 0)
+			continue;
+		/*
+		 * Entries that haven't been updated in thirty days get tossed.
+		 */
+		if(s->date+30*86400 < now)
+			continue;
+		Bwrite(b, s->str, s->n);
+		Bprint(b, "\t%d %d\n", s->count, s->date);
+	}
+	if(Bflush(b) == Beof)
+		return -1;
+	return 0;
+}
+
+void
+Breadhash(Biobuf *b, Hash *hh, int scale)
+{
+	char *s;
+	char *t;
+	int n;
+	int date;
+	Stringtab *st;
+
+	s = Brdstr(b, '\n', 1);
+	if(s == nil)
+		return;
+	if(strcmp(s, "# hash table") != 0)
+		sysfatal("bad hash table format");
+
+	while(s = Brdline(b, '\n')){
+		s[Blinelen(b)-1] = 0;
+		t = strrchr(s, '\t');
+		if(t == nil)
+			sysfatal("bad hash table format");
+		*t++ = '\0';
+		if(*t < '0' || *t > '9')
+			sysfatal("bad hash table format");
+		n = strtol(t, &t, 10);
+		date = time(0);
+		if(*t != 0){
+			if(*t == ' '){
+				t++;
+				date = strtol(t, &t, 10);
+			}
+			if(*t != 0)
+				sysfatal("bad hash table format");
+		}
+		st = findstab(hh, s, strlen(s), 1);
+		if(date > st->date)
+			st->date = date;
+		st->count += n*scale;
+	}
+}
+
+void
+freehash(Hash *h)
+{
+	Stringtab *s, *next;
+
+	for(s=h->all; s; s=next){
+		next = s->link;
+		tabfree(s);
+	}
+	free(h->stab);
+	free(h);
+}
+
+Biobuf*
+Bopenlock(char *file, int mode)
+{
+	int i;
+	Biobuf *b;
+	char err[ERRMAX];
+
+	b = nil;
+	for(i=0; i<120; i++){
+		if((b = Bopen(file, mode)) != nil)
+			break;
+		rerrstr(err, sizeof err);
+		if(strstr(err, "file is locked")==nil && strstr(err, "exclusive lock")==nil)
+			break;
+		sleep(1000);
+	}
+	return b;
+}
diff --git a/src/cmd/upas/bayes/hash.h b/src/cmd/upas/bayes/hash.h
new file mode 100644
index 0000000..a1cff39
--- /dev/null
+++ b/src/cmd/upas/bayes/hash.h
@@ -0,0 +1,27 @@
+typedef struct Stringtab	Stringtab;
+struct Stringtab {
+	Stringtab *link;
+	Stringtab *hash;
+	char *str;
+	int n;
+	int count;
+	int date;
+};
+
+typedef struct Hash Hash;
+struct Hash
+{
+	int sorted;
+	Stringtab **stab;
+	int nstab;
+	int ntab;
+	Stringtab *all;
+};
+
+Stringtab *findstab(Hash*, char*, int, int);
+Stringtab *sortstab(Hash*);
+
+int Bwritehash(Biobuf*, Hash*);	/* destroys hash */
+void Breadhash(Biobuf*, Hash*, int);
+void freehash(Hash*);
+Biobuf *Bopenlock(char*, int);
diff --git a/src/cmd/upas/bayes/mkfile b/src/cmd/upas/bayes/mkfile
new file mode 100644
index 0000000..c0c546e
--- /dev/null
+++ b/src/cmd/upas/bayes/mkfile
@@ -0,0 +1,33 @@
+</$objtype/mkfile
+
+TARG=addhash bayes msgtok
+HFILES=
+OFILES=
+LIB=
+
+BIN=/$objtype/bin/upas
+</sys/src/cmd/mkmany
+
+# msg tokenizer
+$O.regen: regcomp.$O dfa.$O
+dfa.$O regcomp.$O regen.$O: dfa.h
+
+/mail/lib/classify.re: $O.regen
+	if(~ $cputype $objtype)
+		$O.regen >x && cp x $target
+
+$O.msgtok: dfa.$O
+
+# msg database 
+msgdbx.$O msgdb.$O: msgdb.h
+
+# hash table creator/dumper
+$O.msgdb: msgdbx.$O
+
+$O.msgclass: hash.$O msgdbx.$O
+
+$O.addhash: hash.$O 
+
+$O.bayes: hash.$O
+
+
diff --git a/src/cmd/upas/bayes/msgclass.c b/src/cmd/upas/bayes/msgclass.c
new file mode 100644
index 0000000..bd3c571
--- /dev/null
+++ b/src/cmd/upas/bayes/msgclass.c
@@ -0,0 +1,296 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ctype.h>
+#include "msgdb.h"
+
+void
+usage(void)
+{
+	fprint(2, "usage: upas/msgclass [-a] [-d name dbfile]... [-l lockfile] [-m mul] [-t thresh] [tokenfile ...]\n");
+	exits("usage");
+}
+
+enum
+{
+	MAXBEST = 32,
+	MAXLEN = 64,
+	MAXTAB = 256,
+};
+
+typedef struct Ndb Ndb;
+struct Ndb
+{
+	char *name;
+	char *file;
+	Msgdb *db;
+	double p;
+	long nmsg;
+};
+
+typedef struct Word Word;
+struct Word
+{
+	char s[MAXLEN];
+	int count[MAXTAB];
+	double p[MAXTAB];
+	double mp;
+	int mi; /* w.p[w.mi] = w.mp */
+	int nmsg;
+};
+
+Ndb db[MAXTAB];
+int ndb;
+
+int add;
+int mul;
+Msgdb *indb;
+
+Word best[MAXBEST];
+int mbest = 15;
+int nbest;
+
+void process(Biobuf*, char*);
+void lockfile(char*);
+
+void
+noteword(Word *w, char *s)
+{
+	int i;
+
+	for(i=nbest-1; i>=0; i--)
+		if(w->mp < best[i].mp)
+			break;
+	i++;
+
+	if(i >= mbest)
+		return;
+	if(nbest == mbest)
+		nbest--;
+	if(i < nbest)
+		memmove(&best[i+1], &best[i], (nbest-i)*sizeof(best[0]));
+	best[i] = *w;
+	strecpy(best[i].s, best[i].s+MAXLEN, s);
+	nbest++;
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, bad, m, tot, nn, j;
+	Biobuf bin, *b, bout;
+	char *s, *lf;
+	double totp, p, thresh;
+	long n;
+	Word w;
+
+	lf = nil;
+	thresh = 0;
+	ARGBEGIN{
+	case 'a':
+		add = 1;
+		break;
+	case 'd':
+		if(ndb >= MAXTAB)
+			sysfatal("too many db classes");
+		db[ndb].name = EARGF(usage());
+		db[ndb].file = EARGF(usage());
+		ndb++;
+		break;
+	case 'l':
+		lf = EARGF(usage());
+		break;
+	case 'm':
+		mul = atoi(EARGF(usage()));
+		break;
+	case 't':
+		thresh = atof(EARGF(usage()));
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if(ndb == 0){
+		fprint(2, "must have at least one -d option\n");
+		usage();
+	}
+
+	indb = mdopen(nil, 1);
+	if(argc == 0){
+		Binit(&bin, 0, OREAD);
+		process(&bin, "<stdin>");
+		Bterm(&bin);
+	}else{
+		bad = 0;
+		for(i=0; i<argc; i++){
+			if((b = Bopen(argv[i], OREAD)) == nil){
+				fprint(2, "opening %s: %r\n", argv[i]);
+				bad = 1;
+				continue;
+			}
+			process(b, argv[i]);
+			Bterm(b);
+		}
+		if(bad)
+			exits("open inputs");
+	}
+
+	lockfile(lf);
+	bad = 0;
+	for(i=0; i<ndb; i++){
+		if((db[i].db = mdopen(db[i].file, 0)) == nil){
+			fprint(2, "opendb %s: %r\n", db[i].file);
+			bad = 1;
+		}
+		db[i].nmsg = mdget(db[i].db, "*From*");
+	}
+	if(bad)
+		exits("open databases");
+
+	/* run conditional probabilities of input words, getting 15 most specific */
+	mdenum(indb);
+	nbest = 0;
+	while(mdnext(indb, &s, &n) >= 0){
+		tot = 0;
+		totp = 0.0;
+		for(i=0; i<ndb; i++){
+			nn = mdget(db[i].db, s)*(i==0 ? 3 : 1);
+			tot += nn;
+			w.count[i] = nn;
+			p = w.count[i]/(double)db[i].nmsg;
+			if(p >= 1.0)
+				p = 1.0;
+			w.p[i] = p;
+			totp += p;
+		}
+//fprint(2, "%s tot %d totp %g\n", s, tot, totp);
+		if(tot < 2)
+			continue;
+		w.mp = 0.0;
+		for(i=0; i<ndb; i++){
+			p = w.p[i];
+			p /= totp;
+			if(p < 0.001)
+				p = 0.001;
+			else if(p > 0.999)
+				p = 0.999;
+			if(p > w.mp){
+				w.mp = p;
+				w.mi = i;
+			}
+			w.p[i] = p;
+		}
+		noteword(&w, s);
+	}
+
+	/* compute conditional probabilities of message classes using 15 most specific */
+	totp = 0.0;
+	for(i=0; i<ndb; i++){
+		p = 1.0;
+		for(j=0; j<nbest; j++)
+			p *= best[j].p[i];
+		db[i].p = p;
+		totp += p;
+	}
+	for(i=0; i<ndb; i++)
+		db[i].p /= totp;
+	m = 0;
+	for(i=1; i<ndb; i++)
+		if(db[i].p > db[m].p)
+			m = i;
+
+	Binit(&bout, 1, OWRITE);
+	if(db[m].p < thresh)
+		m = -1;
+	if(m >= 0)
+		Bprint(&bout, "%s", db[m].name);
+	else
+		Bprint(&bout, "inconclusive");
+	for(j=0; j<ndb; j++)
+		Bprint(&bout, " %s=%g", db[j].name, db[j].p);
+	Bprint(&bout, "\n");
+	for(i=0; i<nbest; i++){
+		Bprint(&bout, "%s", best[i].s);
+		for(j=0; j<ndb; j++)
+			Bprint(&bout, " %s=%g", db[j].name, best[i].p[j]);
+		Bprint(&bout, "\n");
+	}
+		Bprint(&bout, "%s %g\n", best[i].s, best[i].p[m]);
+	Bterm(&bout);
+
+	if(m >= 0 && add){
+		mdenum(indb);
+		while(mdnext(indb, &s, &n) >= 0)
+			mdput(db[m].db, s, mdget(db[m].db, s)+n*mul);
+		mdclose(db[m].db);
+	}
+	exits(nil);
+}
+
+void
+process(Biobuf *b, char*)
+{
+	char *s;
+	char *p;
+	long n;
+
+	while((s = Brdline(b, '\n')) != nil){
+		s[Blinelen(b)-1] = 0;
+		if((p = strrchr(s, ' ')) != nil){
+			*p++ = 0;
+			n = atoi(p);
+		}else
+			n = 1;
+		mdput(indb, s, mdget(indb, s)+n);
+	}
+}
+
+int tpid;
+void
+killtickle(void)
+{
+	postnote(PNPROC, tpid, "die");
+}
+
+void
+lockfile(char *s)
+{
+	int fd, t, w;
+	char err[ERRMAX];
+
+	if(s == nil)
+		return;
+	w = 50;
+	t = 0;
+	for(;;){
+		fd = open(s, OREAD);
+		if(fd >= 0)
+			break;
+		rerrstr(err, sizeof err);
+		if(strstr(err, "file is locked")==nil && strstr(err, "exclusive lock")==nil))
+			break;
+		sleep(w);
+		t += w;
+		if(w < 1000)
+			w = (w*3)/2;
+		if(t > 120*1000)
+			break;
+	}
+	if(fd < 0)
+		sysfatal("could not lock %s", s);
+	switch(tpid = fork()){
+	case -1:
+		sysfatal("fork: %r");
+	case 0:
+		for(;;){
+			sleep(30*1000);
+			free(dirfstat(fd));
+		}
+		_exits(nil);
+	default:
+		break;
+	}
+	close(fd);
+	atexit(killtickle);
+}
+
diff --git a/src/cmd/upas/bayes/msgdb.c b/src/cmd/upas/bayes/msgdb.c
new file mode 100644
index 0000000..3026a0c
--- /dev/null
+++ b/src/cmd/upas/bayes/msgdb.c
@@ -0,0 +1,63 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "msgdb.h"
+
+void
+usage(void)
+{
+	fprint(2, "usage: msgdb [-c] file\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int create = 0;
+	Msgdb *db;
+	char *tok, *p;
+	long val;
+	int input;
+	Biobuf b;
+
+	input = 0;
+	ARGBEGIN{
+	case 'c':
+		create = 1;
+		break;
+	case 'i':
+		input = 1;
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if(argc != 1)
+		usage();
+
+	if((db = mdopen(argv[0], create)) == nil)
+		sysfatal("open db: %r");
+
+	if(input){
+		Binit(&b, 0, OREAD);
+		while((tok = Brdline(&b, '\n')) != nil){
+			tok[Blinelen(&b)-1] = '\0';
+			p = strrchr(tok, ' ');
+			if(p == nil)
+				val = mdget(db, tok)+1;
+			else{
+				*p++ = 0;
+				val = atoi(p);
+			}
+			mdput(db, tok, val);
+		}
+	}else{
+		mdenum(db);
+		Binit(&b, 1, OWRITE);
+		while(mdnext(db, &tok, &val) >= 0)
+			Bprint(&b, "%s %ld\n", tok, val);
+		Bterm(&b);
+	}
+	mdclose(db);
+	exits(nil);
+}
diff --git a/src/cmd/upas/bayes/msgdb.h b/src/cmd/upas/bayes/msgdb.h
new file mode 100644
index 0000000..54823d7
--- /dev/null
+++ b/src/cmd/upas/bayes/msgdb.h
@@ -0,0 +1,10 @@
+typedef struct Msgdb Msgdb;
+
+Msgdb *mdopen(char*, int);
+long mdget(Msgdb*, char*);
+void mdput(Msgdb*, char*, long);
+
+void mdenum(Msgdb*);
+int mdnext(Msgdb*, char**, long*);
+
+void mdclose(Msgdb*);
diff --git a/src/cmd/upas/bayes/msgdbx.c b/src/cmd/upas/bayes/msgdbx.c
new file mode 100644
index 0000000..60ce70a
--- /dev/null
+++ b/src/cmd/upas/bayes/msgdbx.c
@@ -0,0 +1,109 @@
+#include <u.h>
+#include <libc.h>
+#include <db.h>
+#include "msgdb.h"
+
+struct Msgdb
+{
+	DB *db;
+	int reset;
+};
+
+Msgdb*
+mdopen(char *file, int create)
+{
+	Msgdb *mdb;
+	DB *db;
+	HASHINFO h;
+
+	if((mdb = mallocz(sizeof(Msgdb), 1)) == nil)
+		return nil;
+	memset(&h, 0, sizeof h);
+	h.cachesize = 2*1024*1024;
+	if((db = dbopen(file, ORDWR|(create ? OCREATE:0), 0666, DB_HASH, &h)) == nil){
+		free(mdb);
+		return nil;
+	}
+	mdb->db = db;
+	mdb->reset = 1;
+	return mdb;
+}
+
+long
+mdget(Msgdb *mdb, char *tok)
+{
+	DB *db = mdb->db;
+	DBT key, val;
+	uchar *p;
+
+	key.data = tok;
+	key.size = strlen(tok)+1;
+	val.data = 0;
+	val.size = 0;
+
+	if(db->get(db, &key, &val, 0) < 0)
+		return 0;
+	if(val.data == 0)
+		return 0;
+	if(val.size != 4)
+		return 0;
+	p = val.data;
+	return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
+}
+
+void
+mdput(Msgdb *mdb, char *tok, long n)
+{
+	uchar p[4];
+	DB *db = mdb->db;
+	DBT key, val;
+
+	key.data = tok;
+	key.size = strlen(tok)+1;
+	if(n <= 0){
+		db->del(db, &key, 0);
+		return;
+	}
+
+	p[0] = n>>24;
+	p[1] = n>>16;
+	p[2] = n>>8;
+	p[3] = n;
+
+	val.data = p;
+	val.size = 4;
+	db->put(db, &key, &val, 0);
+}
+
+void
+mdenum(Msgdb *mdb)
+{
+	mdb->reset = 1;
+}
+
+int
+mdnext(Msgdb *mdb, char **sp, long *vp)
+{
+	DBT key, val;
+	uchar *p;
+	DB *db = mdb->db;
+	int i;
+
+	i = db->seq(db, &key, &val, mdb->reset ? R_FIRST : R_NEXT);
+	mdb->reset = 0;
+	if(i)
+		return -1;
+	*sp = key.data;
+	p = val.data;
+	*vp = (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
+	return 0;
+}
+
+void
+mdclose(Msgdb *mdb)
+{
+	DB *db = mdb->db;
+
+	db->close(db);
+	mdb->db = nil;
+}
diff --git a/src/cmd/upas/bayes/msgtok.c b/src/cmd/upas/bayes/msgtok.c
new file mode 100644
index 0000000..7c45054
--- /dev/null
+++ b/src/cmd/upas/bayes/msgtok.c
@@ -0,0 +1,245 @@
+/*
+ * RFC822 message tokenizer (really feature generator) for spam filter.
+ * 
+ * See Paul Graham's musings on spam filtering for theory.
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include <ctype.h>
+#include "dfa.h"
+
+void buildre(Dreprog*[3]);
+int debug;
+char *refile = "/mail/lib/classify.re";
+int maxtoklen = 20;
+int trim(char*);
+
+void
+usage(void)
+{
+	fprint(2, "usage: msgtok [-D] [-r /mail/lib/classify.re] [file]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int i, hdr, n, eof, off;
+	Dreprog *re[3];
+	int m[3];
+	char *p, *ep, *tag;
+	Biobuf bout, bin;
+	char msg[1024+1];
+	char buf[1024];
+
+	buildre(re);
+	ARGBEGIN{
+	case 'D':
+		debug = 1;
+		break;
+	case 'n':
+		maxtoklen = atoi(EARGF(usage()));
+		break;
+	case 'r':
+		refile = EARGF(usage());
+		break;
+	default:
+		usage();
+	}ARGEND;
+
+	if(argc > 1)
+		usage();
+	if(argc == 1){
+		close(0);
+		if(open(argv[0], OREAD) < 0)
+			sysfatal("open %s: %r", argv[0]);
+	}
+
+	tag = nil;
+	Binit(&bin, 0, OREAD);
+	Binit(&bout, 1, OWRITE);
+	ep = msg;
+	p = msg;
+	eof = 0;
+	off = 0;
+	hdr = 1;
+	for(;;){
+		/* replenish buffer */
+		if(ep - p < 512 && !eof){
+			if(p > msg + 1){
+				n = ep - p;
+				memmove(msg, p-1, ep-(p-1));
+				off += (p-1) - msg;
+				p = msg+1;
+				ep = p + n;
+			}
+			n = Bread(&bin, ep, msg+(sizeof msg - 1)- ep);
+			if(n < 0)
+				sysfatal("read error: %r");
+			if(n == 0)
+				eof = 1;
+			ep += n;
+			*ep = 0;
+		}
+		if(p >= ep)
+			break;
+
+		if(*p == 0){
+			p++;
+			continue;
+		}
+
+		if(hdr && p[-1]=='\n'){
+			if(p[0]=='\n')
+				hdr = 0;
+			else if(cistrncmp(p-1, "\nfrom:", 6) == 0)
+				tag = "From*";
+			else if(cistrncmp(p-1, "\nto:", 4) == 0)
+				tag = "To*";
+			else if(cistrncmp(p-1, "\nsubject:", 9) == 0)
+				tag = "Subject*";
+			else if(cistrncmp(p-1, "\nreturn-path:", 13) == 0)
+				tag = "Return-Path*";
+			else
+				tag = nil;
+		}
+		m[0] = dregexec(re[0], p, p==msg || p[-1]=='\n');
+		m[1] = dregexec(re[1], p, p==msg || p[-1]=='\n');
+		m[2] = dregexec(re[2], p, p==msg || p[-1]=='\n');
+
+		n = m[0];
+		if(n < m[1])
+			n = m[1];
+		if(n < m[2])
+			n = m[2];
+		if(n <= 0){
+fprint(2, "«%s» %.2ux", p, p[0]);
+			sysfatal("no regexps matched at %ld", off + (p-msg));
+		}
+
+		if(m[0] >= m[1] && m[0] >= m[2]){
+			/* "From " marks start of new message */
+			Bprint(&bout, "*From*\n");
+			n = m[0];
+			hdr = 1;
+		}else if(m[2] > 1){
+			/* ignore */
+			n = m[2];
+		}else if(m[1] >= m[0] && m[1] >= m[2] && m[1] > 2 && m[1] <= maxtoklen){
+			/* keyword */
+			/* should do UTF-aware lowercasing, too much bother */
+/*
+			for(i=0; i<n; i++)
+				if('A' <= p[i] && p[i] <= 'Z')
+					p[i] += 'a' - 'A';
+*/
+			if(tag){
+				i = strlen(tag);	
+				memmove(buf, tag, i);
+				memmove(buf+i, p, m[1]);
+				buf[i+m[1]] = 0;
+			}else{
+				memmove(buf, p, m[1]);
+				buf[m[1]] = 0;
+			}
+			Bprint(&bout, "%s\n", buf);
+			while(trim(buf) >= 0)
+				Bprint(&bout, "stem*%s\n", buf);
+			n = m[1];
+		}else
+			n = m[2];
+		if(debug)
+			fprint(2, "%.*s¦", utfnlen(p, n), p);
+		p += n;
+	}
+	Bterm(&bout);
+	exits(0);
+}
+
+void
+buildre(Dreprog *re[3])
+{
+	Biobuf *b;
+
+	if((b = Bopen(refile, OREAD)) == nil)
+		sysfatal("open %s: %r", refile);
+
+	re[0] = Breaddfa(b);
+	re[1] = Breaddfa(b);
+	re[2] = Breaddfa(b);
+
+	if(re[0]==nil || re[1]==nil || re[2]==nil)
+		sysfatal("Breaddfa: %r");
+	Bterm(b);
+}
+
+/* perhaps this belongs in the tokenizer */
+int
+trim(char *s)
+{
+	char *p, *op;
+	int mix, mix1;
+
+	if(*s == '*')
+		return -1;
+
+	/* strip leading punctuation */
+	p = strchr(s, '*');
+	if(p == nil)
+		p = s;
+	while(*p && !isalpha(*p))
+		p++;
+	if(strlen(p) < 2)
+{
+		return -1;
+}
+	memmove(s, p, strlen(p)+1);
+
+	/* strip suffix of punctuation */
+	p = s+strlen(s);
+	op = p;
+	while(p > s && (uchar)p[-1]<0x80 && !isalpha(p[-1]))
+		p--;
+
+	/* chop punctuation */
+	if(p > s){
+		/* free!!! -> free! */
+		if(p+1 < op){
+			p[1] = 0;
+			return 0;
+		}
+		/* free! -> free */
+		if(p < op){
+			p[0] = 0;
+			return 0;
+		}
+	}
+
+	mix = mix1 = 0;
+	if(isupper(s[0]))
+		mix = 1;
+	for(p=s+1; *p; p++)
+		if(isupper(*p)){
+			mix1 = 1;
+			break;
+		}
+
+	/* turn FREE into Free */
+	if(mix1){
+		for(p=s+1; *p; p++)
+			if(isupper(*p))
+				*p += 'a'-'A';
+		return 0;
+	}
+
+	/* turn Free into free */
+	if(mix){
+		*s += 'a'-'A';
+		return 0;
+	}
+	return -1;
+}		
+
diff --git a/src/cmd/upas/bayes/regcomp.c b/src/cmd/upas/bayes/regcomp.c
new file mode 100644
index 0000000..8afaf21
--- /dev/null
+++ b/src/cmd/upas/bayes/regcomp.c
@@ -0,0 +1,563 @@
+/* From libregexp but leaks extra classes when it runs out */
+
+
+#include <u.h>
+#include <libc.h>
+#include "regexp.h"
+#include "/sys/src/libregexp/regcomp.h"
+
+#define	TRUE	1
+#define	FALSE	0
+
+/*
+ * Parser Information
+ */
+typedef
+struct Node
+{
+	Reinst*	first;
+	Reinst*	last;
+}Node;
+
+#define	NSTACK	20
+static	Node	andstack[NSTACK];
+static	Node	*andp;
+static	int	atorstack[NSTACK];
+static	int*	atorp;
+static	int	cursubid;		/* id of current subexpression */
+static	int	subidstack[NSTACK];	/* parallel to atorstack */
+static	int*	subidp;
+static	int	lastwasand;	/* Last token was operand */
+static	int	nbra;
+static	char*	exprp;		/* pointer to next character in source expression */
+static	int	lexdone;
+static	int	nclass;
+static	Reclass*classp;
+static	Reinst*	freep;
+static	int	errors;
+static	Rune	yyrune;		/* last lex'd rune */
+static	Reclass*yyclassp;	/* last lex'd class */
+
+/* predeclared crap */
+static	void	operator(int);
+static	void	pushand(Reinst*, Reinst*);
+static	void	pushator(int);
+static	void	evaluntil(int);
+static	int	bldcclass(void);
+
+static jmp_buf regkaboom;
+
+static	void
+rcerror(char *s)
+{
+	errors++;
+	regerror(s);
+	longjmp(regkaboom, 1);
+}
+
+static	Reinst*
+newinst(int t)
+{
+	freep->type = t;
+	freep->left = 0;
+	freep->right = 0;
+	return freep++;
+}
+
+static	void
+operand(int t)
+{
+	Reinst *i;
+
+	if(lastwasand)
+		operator(CAT);	/* catenate is implicit */
+	i = newinst(t);
+
+	if(t == CCLASS || t == NCCLASS)
+		i->cp = yyclassp;
+	if(t == RUNE)
+		i->r = yyrune;
+
+	pushand(i, i);
+	lastwasand = TRUE;
+}
+
+static	void
+operator(int t)
+{
+	if(t==RBRA && --nbra<0)
+		rcerror("unmatched right paren");
+	if(t==LBRA){
+		if(++cursubid >= NSUBEXP)
+			rcerror ("too many subexpressions");
+		nbra++;
+		if(lastwasand)
+			operator(CAT);
+	} else
+		evaluntil(t);
+	if(t != RBRA)
+		pushator(t);
+	lastwasand = FALSE;
+	if(t==STAR || t==QUEST || t==PLUS || t==RBRA)
+		lastwasand = TRUE;	/* these look like operands */
+}
+
+static	void
+regerr2(char *s, int c)
+{
+	char buf[100];
+	char *cp = buf;
+	while(*s)
+		*cp++ = *s++;
+	*cp++ = c;
+	*cp = '\0'; 
+	rcerror(buf);
+}
+
+static	void
+cant(char *s)
+{
+	char buf[100];
+	strcpy(buf, "can't happen: ");
+	strcat(buf, s);
+	rcerror(buf);
+}
+
+static	void
+pushand(Reinst *f, Reinst *l)
+{
+	if(andp >= &andstack[NSTACK])
+		cant("operand stack overflow");
+	andp->first = f;
+	andp->last = l;
+	andp++;
+}
+
+static	void
+pushator(int t)
+{
+	if(atorp >= &atorstack[NSTACK])
+		cant("operator stack overflow");
+	*atorp++ = t;
+	*subidp++ = cursubid;
+}
+
+static	Node*
+popand(int op)
+{
+	Reinst *inst;
+
+	if(andp <= &andstack[0]){
+		regerr2("missing operand for ", op);
+		inst = newinst(NOP);
+		pushand(inst,inst);
+	}
+	return --andp;
+}
+
+static	int
+popator(void)
+{
+	if(atorp <= &atorstack[0])
+		cant("operator stack underflow");
+	--subidp;
+	return *--atorp;
+}
+
+static	void
+evaluntil(int pri)
+{
+	Node *op1, *op2;
+	Reinst *inst1, *inst2;
+
+	while(pri==RBRA || atorp[-1]>=pri){
+		switch(popator()){
+		default:
+			rcerror("unknown operator in evaluntil");
+			break;
+		case LBRA:		/* must have been RBRA */
+			op1 = popand('(');
+			inst2 = newinst(RBRA);
+			inst2->subid = *subidp;
+			op1->last->next = inst2;
+			inst1 = newinst(LBRA);
+			inst1->subid = *subidp;
+			inst1->next = op1->first;
+			pushand(inst1, inst2);
+			return;
+		case OR:
+			op2 = popand('|');
+			op1 = popand('|');
+			inst2 = newinst(NOP);
+			op2->last->next = inst2;
+			op1->last->next = inst2;
+			inst1 = newinst(OR);
+			inst1->right = op1->first;
+			inst1->left = op2->first;
+			pushand(inst1, inst2);
+			break;
+		case CAT:
+			op2 = popand(0);
+			op1 = popand(0);
+			op1->last->next = op2->first;
+			pushand(op1->first, op2->last);
+			break;
+		case STAR:
+			op2 = popand('*');
+			inst1 = newinst(OR);
+			op2->last->next = inst1;
+			inst1->right = op2->first;
+			pushand(inst1, inst1);
+			break;
+		case PLUS:
+			op2 = popand('+');
+			inst1 = newinst(OR);
+			op2->last->next = inst1;
+			inst1->right = op2->first;
+			pushand(op2->first, inst1);
+			break;
+		case QUEST:
+			op2 = popand('?');
+			inst1 = newinst(OR);
+			inst2 = newinst(NOP);
+			inst1->left = inst2;
+			inst1->right = op2->first;
+			op2->last->next = inst2;
+			pushand(inst1, inst2);
+			break;
+		}
+	}
+}
+
+static	Reprog*
+optimize(Reprog *pp)
+{
+	Reinst *inst, *target;
+	int size;
+	Reprog *npp;
+	Reclass *cl;
+	int diff;
+
+	/*
+	 *  get rid of NOOP chains
+	 */
+	for(inst=pp->firstinst; inst->type!=END; inst++){
+		target = inst->next;
+		while(target->type == NOP)
+			target = target->next;
+		inst->next = target;
+	}
+
+	/*
+	 *  The original allocation is for an area larger than
+	 *  necessary.  Reallocate to the actual space used
+	 *  and then relocate the code.
+	 */
+	size = sizeof(Reprog) + (freep - pp->firstinst)*sizeof(Reinst);
+	npp = realloc(pp, size);
+	if(npp==0 || npp==pp)
+		return pp;
+	diff = (char *)npp - (char *)pp;
+	freep = (Reinst *)((char *)freep + diff);
+	for(inst=npp->firstinst; inst<freep; inst++){
+		switch(inst->type){
+		case OR:
+		case STAR:
+		case PLUS:
+		case QUEST:
+			*(char **)&inst->right += diff;
+			break;
+		case CCLASS:
+		case NCCLASS:
+			*(char **)&inst->right += diff;
+			cl = inst->cp;
+			*(char **)&cl->end += diff;
+			break;
+		}
+		*(char **)&inst->left += diff;
+	}
+	*(char **)&npp->startinst += diff;
+	return npp;
+}
+
+#ifdef	DEBUG
+static	void
+dumpstack(void){
+	Node *stk;
+	int *ip;
+
+	print("operators\n");
+	for(ip=atorstack; ip<atorp; ip++)
+		print("0%o\n", *ip);
+	print("operands\n");
+	for(stk=andstack; stk<andp; stk++)
+		print("0%o\t0%o\n", stk->first->type, stk->last->type);
+}
+
+static	void
+dump(Reprog *pp)
+{
+	Reinst *l;
+	Rune *p;
+
+	l = pp->firstinst;
+	do{
+		print("%d:\t0%o\t%d\t%d", l-pp->firstinst, l->type,
+			l->left-pp->firstinst, l->right-pp->firstinst);
+		if(l->type == RUNE)
+			print("\t%C\n", l->r);
+		else if(l->type == CCLASS || l->type == NCCLASS){
+			print("\t[");
+			if(l->type == NCCLASS)
+				print("^");
+			for(p = l->cp->spans; p < l->cp->end; p += 2)
+				if(p[0] == p[1])
+					print("%C", p[0]);
+				else
+					print("%C-%C", p[0], p[1]);
+			print("]\n");
+		} else
+			print("\n");
+	}while(l++->type);
+}
+#endif
+
+static	Reclass*
+newclass(void)
+{
+	if(nclass <= 0){
+		classp = mallocz(128*sizeof(Reclass), 1);
+		if(classp == nil)
+			regerror("out of memory");
+		nclass = 128;
+	}
+	return &classp[--nclass];
+}
+
+static	int
+nextc(Rune *rp)
+{
+	if(lexdone){
+		*rp = 0;
+		return 1;
+	}
+	exprp += chartorune(rp, exprp);
+	if(*rp == L'\\'){
+		exprp += chartorune(rp, exprp);
+		return 1;
+	}
+	if(*rp == 0)
+		lexdone = 1;
+	return 0;
+}
+
+static	int
+lex(int literal, int dot_type)
+{
+	int quoted;
+
+	quoted = nextc(&yyrune);
+	if(literal || quoted){
+		if(yyrune == 0)
+			return END;
+		return RUNE;
+	}
+
+	switch(yyrune){
+	case 0:
+		return END;
+	case L'*':
+		return STAR;
+	case L'?':
+		return QUEST;
+	case L'+':
+		return PLUS;
+	case L'|':
+		return OR;
+	case L'.':
+		return dot_type;
+	case L'(':
+		return LBRA;
+	case L')':
+		return RBRA;
+	case L'^':
+		return BOL;
+	case L'$':
+		return EOL;
+	case L'[':
+		return bldcclass();
+	}
+	return RUNE;
+}
+
+static int
+bldcclass(void)
+{
+	int type;
+	Rune r[NCCRUNE];
+	Rune *p, *ep, *np;
+	Rune rune;
+	int quoted;
+
+	/* we have already seen the '[' */
+	type = CCLASS;
+	yyclassp = newclass();
+
+	/* look ahead for negation */
+	/* SPECIAL CASE!!! negated classes don't match \n */
+	ep = r;
+	quoted = nextc(&rune);
+	if(!quoted && rune == L'^'){
+		type = NCCLASS;
+		quoted = nextc(&rune);
+		*ep++ = L'\n';
+		*ep++ = L'\n';
+	}
+
+	/* parse class into a set of spans */
+	for(; ep<&r[NCCRUNE];){
+		if(rune == 0){
+			rcerror("malformed '[]'");
+			return 0;
+		}
+		if(!quoted && rune == L']')
+			break;
+		if(!quoted && rune == L'-'){
+			if(ep == r){
+				rcerror("malformed '[]'");
+				return 0;
+			}
+			quoted = nextc(&rune);
+			if((!quoted && rune == L']') || rune == 0){
+				rcerror("malformed '[]'");
+				return 0;
+			}
+			*(ep-1) = rune;
+		} else {
+			*ep++ = rune;
+			*ep++ = rune;
+		}
+		quoted = nextc(&rune);
+	}
+
+	/* sort on span start */
+	for(p = r; p < ep; p += 2){
+		for(np = p; np < ep; np += 2)
+			if(*np < *p){
+				rune = np[0];
+				np[0] = p[0];
+				p[0] = rune;
+				rune = np[1];
+				np[1] = p[1];
+				p[1] = rune;
+			}
+	}
+
+	/* merge spans */
+	np = yyclassp->spans;
+	p = r;
+	if(r == ep)
+		yyclassp->end = np;
+	else {
+		np[0] = *p++;
+		np[1] = *p++;
+		for(; p < ep; p += 2)
+			if(p[0] <= np[1]){
+				if(p[1] > np[1])
+					np[1] = p[1];
+			} else {
+				np += 2;
+				np[0] = p[0];
+				np[1] = p[1];
+			}
+		yyclassp->end = np+2;
+	}
+
+	return type;
+}
+
+static	Reprog*
+regcomp1(char *s, int literal, int dot_type)
+{
+	int token;
+	Reprog *pp;
+
+	/* get memory for the program */
+	pp = malloc(sizeof(Reprog) + 6*sizeof(Reinst)*strlen(s));
+	if(pp == 0){
+		regerror("out of memory");
+		return 0;
+	}
+	freep = pp->firstinst;
+	classp = pp->class;
+	errors = 0;
+
+	if(setjmp(regkaboom))
+		goto out;
+
+	/* go compile the sucker */
+	lexdone = 0;
+	exprp = s;
+	nclass = NCLASS;
+	nbra = 0;
+	atorp = atorstack;
+	andp = andstack;
+	subidp = subidstack;
+	lastwasand = FALSE;
+	cursubid = 0;
+
+	/* Start with a low priority operator to prime parser */
+	pushator(START-1);
+	while((token = lex(literal, dot_type)) != END){
+		if((token&0300) == OPERATOR)
+			operator(token);
+		else
+			operand(token);
+	}
+
+	/* Close with a low priority operator */
+	evaluntil(START);
+
+	/* Force END */
+	operand(END);
+	evaluntil(START);
+#ifdef DEBUG
+	dumpstack();
+#endif
+	if(nbra)
+		rcerror("unmatched left paren");
+	--andp;	/* points to first and only operand */
+	pp->startinst = andp->first;
+#ifdef DEBUG
+	dump(pp);
+#endif
+	pp = optimize(pp);
+#ifdef DEBUG
+	print("start: %d\n", andp->first-pp->firstinst);
+	dump(pp);
+#endif
+out:
+	if(errors){
+		free(pp);
+		pp = 0;
+	}
+	return pp;
+}
+
+extern	Reprog*
+regcomp(char *s)
+{
+	return regcomp1(s, 0, ANY);
+}
+
+extern	Reprog*
+regcomplit(char *s)
+{
+	return regcomp1(s, 1, ANY);
+}
+
+extern	Reprog*
+regcompnl(char *s)
+{
+	return regcomp1(s, 0, ANYNL);
+}
diff --git a/src/cmd/upas/bayes/regen.c b/src/cmd/upas/bayes/regen.c
new file mode 100644
index 0000000..4f55009
--- /dev/null
+++ b/src/cmd/upas/bayes/regen.c
@@ -0,0 +1,176 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <regexp.h>
+#include "dfa.h"
+
+/***
+ * Regular expression for matching.
+ */
+
+char *ignore[] = 
+{
+	/* HTML that isn't A, IMG, or FONT */
+	/* Must have a space somewhere to avoid catching <email@address> */
+	"<[ 	\n\r]*("
+		"[^aif]|"
+		"a[^> \t\r\n]|"
+		"i[^mM \t\r\n]|"
+		"im[^gG \t\r\n]|"
+		"img[^> \t\r\n]|"
+		"f[^oO \t\r\n]|"
+		"fo[^Nn \t\r\n]|"
+		"fon[^tT \t\r\n]|"
+		"font[^> \r\t\n]"
+	")[^>]*[ \t\n\r][^>]*>",
+	"<[ 	\n\r]*("
+		"i|im|f|fo|fon"
+	")[ \t\r\n][^>]*>",
+
+	/* ignore html comments */
+	"<!--([^\\-]|-[^\\-]|--[^>]|\n)*-->",
+
+	/* random mail strings */
+	"^message-id:.*\n([ 	].*\n)*",
+	"^in-reply-to:.*\n([ 	].*\n)*",
+	"^references:.*\n([ 	].*\n)*",
+	"^date:.*\n([ 	].*\n)*",
+	"^delivery-date:.*\n([ 	].*\n)*",
+	"e?smtp id .*",
+	"^	id.*",
+	"boundary=.*",
+	"name=\"",
+	"filename=\"",
+	"news:<[^>]+>",
+	"^--[^ 	]*$",
+
+	/* base64 encoding */
+	"^[0-9a-zA-Z+\\-=/]+$",
+
+	/* uu encoding */
+	"^[!-Z]+$",
+
+	/* little things */
+	".",
+	"\n",
+};
+
+char *keywords[] =
+{
+	"([a-zA-Z'`$!¡-￿]|[0-9]([.,][0-9])*)+",
+};
+
+int debug;
+
+Dreprog*
+dregcomp(char *buf)
+{
+	Reprog *r;
+	Dreprog *d;
+
+	if(debug)
+		print(">>> '%s'\n", buf);
+
+	r = regcomp(buf);
+	if(r == nil)
+		sysfatal("regcomp");
+	d = dregcvt(r);
+	if(d == nil)
+		sysfatal("dregcomp");
+	free(r);
+	return d;
+}
+
+char*
+strcpycase(char *d, char *s)
+{
+	int cc, esc;
+
+	cc = 0;
+	esc = 0;
+	while(*s){
+		if(*s == '[')
+			cc++;
+		if(*s == ']')
+			cc--;
+		if(!cc && 'a' <= *s && *s <= 'z'){
+			*d++ = '[';
+			*d++ = *s;
+			*d++ = *s+'A'-'a';
+			*d++ = ']';
+		}else
+			*d++ = *s;
+		if(*s == '\\')
+			esc++;
+		else if(esc)
+			esc--;
+		s++;
+	}
+	return d;
+}
+
+void
+regerror(char *msg)
+{
+	sysfatal("regerror: %s", msg);
+}
+
+void
+buildre(Dreprog *re[3])
+{
+	int i;
+	static char buf[16384], *s;
+
+	re[0] = dregcomp("^From ");
+	
+	s = buf;
+	for(i=0; i<nelem(keywords); i++){
+		if(i != 0)
+			*s++ = '|';
+		s = strcpycase(s, keywords[i]);
+	}
+	*s = 0;
+	re[1] = dregcomp(buf);
+
+	s = buf;
+	for(i=0; i<nelem(ignore); i++){
+		if(i != 0)
+			*s++ = '|';
+		s = strcpycase(s, ignore[i]);
+	}
+	*s = 0;
+	re[2] = dregcomp(buf);
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: regen [-d]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	Dreprog *re[3];
+	Biobuf b;
+
+	ARGBEGIN{
+	default:
+		usage();
+	case 'd':
+		debug = 1;
+	}ARGEND
+
+	if(argc != 0)
+		usage();
+
+	buildre(re);
+	Binit(&b, 1, OWRITE);
+	Bprintdfa(&b, re[0]);
+	Bprintdfa(&b, re[1]);
+	Bprintdfa(&b, re[2]);
+	exits(0);
+}
+
+	
\ No newline at end of file
diff --git a/src/cmd/upas/common/appendfiletombox.c b/src/cmd/upas/common/appendfiletombox.c
new file mode 100644
index 0000000..98f5157
--- /dev/null
+++ b/src/cmd/upas/common/appendfiletombox.c
@@ -0,0 +1,155 @@
+#include "common.h"
+
+enum {
+	Buffersize = 64*1024,
+};
+
+typedef struct Inbuf Inbuf;
+struct Inbuf
+{
+	char buf[Buffersize];
+	char *wp;
+	char *rp;
+	int eof;
+	int in;
+	int out;
+	int last;
+	ulong bytes;
+};
+
+static Inbuf*
+allocinbuf(int in, int out)
+{
+	Inbuf *b;
+
+	b = mallocz(sizeof(Inbuf), 1);
+	if(b == nil)
+		sysfatal("reading mailbox: %r");
+	b->rp = b->wp = b->buf;
+	b->in = in;
+	b->out = out;
+	return b;
+}
+
+static int
+fill(Inbuf *b, int addspace)
+{
+	int i, n;
+
+	if(b->eof && b->wp - b->rp == 0)
+		return 0;
+
+	n = b->rp - b->buf;
+	if(n > 0){
+		i = write(b->out, b->buf, n);
+		if(i != n)
+			return -1;
+		b->last = b->buf[n-1];
+		b->bytes += n;
+	}
+	if(addspace){
+		if(write(b->out, " ", 1) != 1)
+			return -1;
+		b->last = ' ';
+		b->bytes++;
+	}
+
+	n = b->wp - b->rp;
+	memmove(b->buf, b->rp, n);
+	b->rp = b->buf;
+	b->wp = b->rp + n;
+
+	i = read(b->in, b->buf+n, sizeof(b->buf)-n);
+	if(i < 0)
+		return -1;
+	b->wp += i;
+
+	return b->wp - b->rp;
+}
+
+/* code to escape ' '*From' ' at the beginning of a line */
+int
+appendfiletombox(int in, int out)
+{
+	int addspace;
+	int n;
+	char *p;
+	int sol;
+	Inbuf *b;
+
+	seek(out, 0, 2);
+
+	b = allocinbuf(in, out);
+	addspace = 0;
+	sol = 1;
+
+	for(;;){
+		if(b->wp - b->rp < 5){
+			n = fill(b, addspace);
+			addspace = 0;
+			if(n < 0)
+				goto error;
+			if(n == 0)
+				break;
+			if(n < 5){
+				b->rp = b->wp;
+				continue;
+			}
+		}
+
+		/* state machine looking for ' '*From' ' */
+		if(!sol){
+			p = memchr(b->rp, '\n', b->wp - b->rp);
+			if(p == nil)
+				b->rp = b->wp;
+			else{
+				b->rp = p+1;
+				sol = 1;
+			}
+			continue;
+		} else {
+			if(*b->rp == ' ' || strncmp(b->rp, "From ", 5) != 0){
+				b->rp++;
+				continue;
+			}
+			addspace = 1;
+			sol = 0;
+		}
+	}
+
+	/* mailbox entries always terminate with two newlines */
+	n = b->last == '\n' ? 1 : 2;
+	if(write(out, "\n\n", n) != n)
+		goto error;
+	n += b->bytes;
+	free(b);
+	return n;
+error:
+	free(b);
+	return -1;
+}
+
+int
+appendfiletofile(int in, int out)
+{
+	int n;
+	Inbuf *b;
+
+	seek(out, 0, 2);
+
+	b = allocinbuf(in, out);
+	for(;;){
+		n = fill(b, 0);
+		if(n < 0)
+			goto error;
+		if(n == 0)
+			break;
+		b->rp = b->wp;
+	}
+	n = b->bytes;
+	free(b);
+	return n;
+error:
+	free(b);
+	return -1;
+}
diff --git a/src/cmd/upas/common/aux.c b/src/cmd/upas/common/aux.c
new file mode 100644
index 0000000..7577aca
--- /dev/null
+++ b/src/cmd/upas/common/aux.c
@@ -0,0 +1,148 @@
+#include "common.h"
+
+/* expand a path relative to some `.' */
+extern String *
+abspath(char *path, char *dot, String *to)
+{
+	if (*path == '/') {
+		to = s_append(to, path);
+	} else {
+		to = s_append(to, dot);
+		to = s_append(to, "/");
+		to = s_append(to, path);
+	}
+	return to;
+}
+
+/* return a pointer to the base component of a pathname */
+extern char *
+basename(char *path)
+{
+	char *cp;
+
+	cp = strrchr(path, '/');
+	return cp==0 ? path : cp+1;
+}
+
+/* append a sub-expression match onto a String */
+extern void
+append_match(Resub *subexp, String *sp, int se)
+{
+	char *cp, *ep;
+
+	cp = subexp[se].s.sp;    /* jpc .sp -> .s.sp */
+	ep = subexp[se].e.ep;    /* jpc .ep -> .e.ep */
+	for (; cp < ep; cp++)
+		s_putc(sp, *cp);
+	s_terminate(sp);
+}
+
+/*
+ *  check for shell characters in a String
+ */
+static char *illegalchars = "\r\n";
+
+extern int
+shellchars(char *cp)
+{
+	char *sp;
+
+	for(sp=illegalchars; *sp; sp++)
+		if(strchr(cp, *sp))
+			return 1;
+	return 0;
+}
+
+static char *specialchars = " ()<>{};=\\'\`^&|";
+static char *escape = "%%";
+
+int
+hexchar(int x)
+{
+	x &= 0xf;
+	if(x < 10)
+		return '0' + x;
+	else
+		return 'A' + x - 10;
+}
+
+/*
+ *  rewrite a string to escape shell characters
+ */
+extern String*
+escapespecial(String *s)
+{
+	String *ns;
+	char *sp;
+
+	for(sp = specialchars; *sp; sp++)
+		if(strchr(s_to_c(s), *sp))
+			break;
+	if(*sp == 0)
+		return s;
+
+	ns = s_new();
+	for(sp = s_to_c(s); *sp; sp++){
+		if(strchr(specialchars, *sp)){
+			s_append(ns, escape);
+			s_putc(ns, hexchar(*sp>>4));
+			s_putc(ns, hexchar(*sp));
+		} else
+			s_putc(ns, *sp);
+	}
+	s_terminate(ns);
+	s_free(s);
+	return ns;
+}
+
+uint
+hex2uint(char x)
+{
+	if(x >= '0' && x <= '9')
+		return x - '0';
+	if(x >= 'A' && x <= 'F')
+		return (x - 'A') + 10;
+	if(x >= 'a' && x <= 'f')
+		return (x - 'a') + 10;
+	return -512;
+}
+
+/*
+ *  rewrite a string to remove shell characters escapes
+ */
+extern String*
+unescapespecial(String *s)
+{
+	String *ns;
+	char *sp;
+	uint c, n;
+
+	if(strstr(s_to_c(s), escape) == 0)
+		return s;
+	n = strlen(escape);
+
+	ns = s_new();
+	for(sp = s_to_c(s); *sp; sp++){
+		if(strncmp(sp, escape, n) == 0){
+			c = (hex2uint(sp[n])<<4) + hex2uint(sp[n+1]);
+			if(c < 0)
+				s_putc(ns, *sp);
+			else {
+				s_putc(ns, c);
+				sp += n+2-1;
+			}
+		} else
+			s_putc(ns, *sp);
+	}
+	s_terminate(ns);
+	s_free(s);
+	return ns;
+
+}
+
+int
+returnable(char *path)
+{
+
+	return strcmp(path, "/dev/null") != 0;
+}
diff --git a/src/cmd/upas/common/become.c b/src/cmd/upas/common/become.c
new file mode 100644
index 0000000..1b5aa45
--- /dev/null
+++ b/src/cmd/upas/common/become.c
@@ -0,0 +1,28 @@
+#include "common.h"
+#include <auth.h>
+#include <ndb.h>
+
+/*
+ *  become powerless user
+ */
+int
+become(char **cmd, char *who)
+{
+	int fd;
+
+	USED(cmd);
+	if(strcmp(who, "none") == 0) {
+		fd = open("#c/user", OWRITE);
+		if(fd < 0 || write(fd, "none", strlen("none")) < 0) {
+			werrstr("can't become none");
+			return -1;
+		}
+		close(fd);
+		// jpc if(newns("none", 0)) {
+		// jpc 	werrstr("can't set new namespace");
+		// jpc	return -1;
+		// jpc }
+	}
+	return 0;
+}
+
diff --git a/src/cmd/upas/common/common.h b/src/cmd/upas/common/common.h
new file mode 100644
index 0000000..d1e9384
--- /dev/null
+++ b/src/cmd/upas/common/common.h
@@ -0,0 +1,79 @@
+#include "sys.h"
+
+/* format of REMOTE FROM lines */
+extern char *REMFROMRE;
+extern int REMSENDERMATCH;
+extern int REMDATEMATCH;
+extern int REMSYSMATCH;
+
+/* format of mailbox FROM lines */
+#define IS_HEADER(p) ((p)[0]=='F'&&(p)[1]=='r'&&(p)[2]=='o'&&(p)[3]=='m'&&(p)[4]==' ')
+#define IS_TRAILER(p) ((p)[0]=='m'&&(p)[1]=='o'&&(p)[2]=='r'&&(p)[3]=='F'&&(p)[4]=='\n')
+extern char *FROMRE;
+extern int SENDERMATCH;
+extern int DATEMATCH;
+
+enum
+{
+	Elemlen= 28,
+	Errlen=	128,
+	Pathlen= 256,
+};
+
+/*
+ *  routines in mail.c
+ */
+extern int	print_header(Biobuf*, char*, char*);
+extern int	print_remote_header(Biobuf*, char*, char*, char*);
+extern int	parse_header(char*, String*, String*);
+
+/*
+ *  routines in aux.c
+ */
+extern String	*abspath(char*, char*, String*);
+extern String	*mboxpath(char*, char*, String*, int);
+extern char	*basename(char*);
+extern int	delivery_status(String*);
+extern void	append_match(Resub*, String*, int);
+extern int	shellchars(char*);
+extern String*	escapespecial(String*);
+extern String*	unescapespecial(String*);
+extern int	returnable(char*);
+
+/* in copymessage */
+extern int	appendfiletombox(int, int);
+extern int	appendfiletofile(int, int);
+
+/* mailbox types */
+#define MF_NORMAL 0
+#define MF_PIPE 1
+#define MF_FORWARD 2
+#define MF_NOMBOX 3
+#define MF_NOTMBOX 4
+
+/* a pipe between parent and child*/
+typedef struct {
+	Biobuf	bb;
+	Biobuf	*fp;	/* parent process end*/
+	int	fd;	/* child process end*/
+} stream;
+
+/* a child process*/
+typedef struct process{
+	stream	*std[3];	/* standard fd's*/
+	int	pid;		/* process identifier*/
+	int	status;		/* exit status*/
+	Waitmsg	*waitmsg;
+} process;
+
+extern stream	*instream(void);
+extern stream	*outstream(void);
+extern void	stream_free(stream*);
+extern process	*noshell_proc_start(char**, stream*, stream*, stream*, int, char*);
+extern process	*proc_start(char*, stream*, stream*, stream*, int, char*);
+extern int	proc_wait(process*);
+extern int	proc_free(process*);
+extern int	proc_kill(process*);
+
+/* tell compiler we're using a value so it won't complain */
+#define USE(x)	if(x)
diff --git a/src/cmd/upas/common/config.c b/src/cmd/upas/common/config.c
new file mode 100644
index 0000000..4bbaff8
--- /dev/null
+++ b/src/cmd/upas/common/config.c
@@ -0,0 +1,11 @@
+#include "common.h"
+
+char *MAILROOT =	"#9/mail";
+char *UPASLOG =		"#9/sys/log";
+char *UPASLIB = 	"#9/mail/lib";
+char *UPASBIN=		"#9/bin/upas";
+char *UPASTMP = 	"#9/mail/tmp";
+char *SHELL = 		"#9/bin/rc";
+char *POST =		"#9/sys/lib/post/dispatch";
+
+int MBOXMODE = 0662;
diff --git a/src/cmd/upas/common/libcommon.a b/src/cmd/upas/common/libcommon.a
new file mode 100644
index 0000000..7266859
--- /dev/null
+++ b/src/cmd/upas/common/libcommon.a
Binary files differ
diff --git a/src/cmd/upas/mkfile b/src/cmd/upas/mkfile
new file mode 100644
index 0000000..fc666a9
--- /dev/null
+++ b/src/cmd/upas/mkfile
@@ -0,0 +1,37 @@
+<$PLAN9/src/mkhdr
+
+LIBS=common
+#PROGS=smtp alias fs ned misc q send scanmail pop3 ml marshal vf filterkit unesc
+PROGS=smtp alias fs ned q send marshal vf 
+#libs must be made first
+DIRS=$LIBS $PROGS
+
+<$PLAN9/src/mkdirs
+
+#
+# setup the mail directories.  this should be done by the administrator since
+# he/she will own everything.  the following files must be altered to reflect
+# local preference.
+#
+# /mail/lib/namefiles	- remove alias files you don't use, insert ones you do.
+# /mail/lib/remotemail	- change '-g research.research.bell-labs.com' to your own mail
+#			  gateway.  if you have none, remove it.
+#			- change '-h plan9.bell-labs.com' to a name you would like
+#			  this host to be known as.  if you don't care, take it
+#			  out and it will use the name in /env/site.
+# /mail/lib/rewrite	- change the line that contains 'helix' to include names,
+#			  other than the contents of /env/site, that your system
+#			  answers to.  this is a hack and will be fixed.
+#
+setup:V:
+	mkdir /mail
+	chmod 775 /mail
+	mkdir /mail/lib
+	chmod 775 /mail/lib
+	mkdir /mail/queue
+	mkdir /mail/box
+	mkdir /mail/tmp
+	chmod 777 /mail/queue /mail/box /mail/tmp
+	mkdir /mail/ml
+	chmod 775 /mail/ml
+	cp misc/rewrite misc/qmail misc/remotemail misc/namefiles /mail/lib
diff --git a/src/cmd/upas/mkfile.9 b/src/cmd/upas/mkfile.9
new file mode 100644
index 0000000..8845999
--- /dev/null
+++ b/src/cmd/upas/mkfile.9
@@ -0,0 +1,99 @@
+<$PLAN9/src/mkhdr
+
+LIBS=common
+#PROGS=smtp alias fs ned misc q send scanmail pop3 ml marshal vf filterkit unesc
+PROGS=smtp alias fs q send marshal vf 
+#libs must be made first
+DIRS=$LIBS $PROGS
+
+UPDATE=\
+	mkfile\
+	/sys/man/1/mail\
+
+all:V:
+	for i in $DIRS
+	do
+		(cd $i; mk $stem)
+	done
+
+clean:V:
+	for (i in $DIRS) @{
+		cd $i
+		mk clean
+	}
+
+nuke:V:
+	for (i in $LIBS) @{
+		cd $i
+		mk nuke
+	}
+	for (i in $PROGS) @{
+		cd $i
+		mk clean
+	}
+
+install:V:
+	for (i in $DIRS) @{
+		cd $i
+		mk install
+	}
+
+installall:V:
+	for (i in $DIRS) @{
+		cd $i
+		mk installall
+	}
+	for (i in $DIRS) @{
+		cd $i
+		mk clean
+	}
+
+safeinstallall:V:
+	for (i in $LIBS) @{
+		cd $i
+		mk installall
+	}
+	for (i in $PROGS) @{
+		cd $i
+		mk safeinstallall
+	}
+	for (i in $DIRS) @{
+		cd $i
+		mk clean
+	}
+
+update:V:
+	update $UPDATEFLAGS $UPDATE
+	for (i in $DIRS) @{
+		cd $i
+		echo '>>>>>>>>>>' `{pwd} '<<<<<<<<<<<'
+		mk $MKFLAGS 'UPDATEFLAGS='$"UPDATEFLAGS update
+	}
+
+#
+# setup the mail directories.  this should be done by the administrator since
+# he/she will own everything.  the following files must be altered to reflect
+# local preference.
+#
+# /mail/lib/namefiles	- remove alias files you don't use, insert ones you do.
+# /mail/lib/remotemail	- change '-g research.research.bell-labs.com' to your own mail
+#			  gateway.  if you have none, remove it.
+#			- change '-h plan9.bell-labs.com' to a name you would like
+#			  this host to be known as.  if you don't care, take it
+#			  out and it will use the name in /env/site.
+# /mail/lib/rewrite	- change the line that contains 'helix' to include names,
+#			  other than the contents of /env/site, that your system
+#			  answers to.  this is a hack and will be fixed.
+#
+setup:V:
+	mkdir /mail
+	chmod 775 /mail
+	mkdir /mail/lib
+	chmod 775 /mail/lib
+	mkdir /mail/queue
+	mkdir /mail/box
+	mkdir /mail/tmp
+	chmod 777 /mail/queue /mail/box /mail/tmp
+	mkdir /mail/ml
+	chmod 775 /mail/ml
+	cp misc/rewrite misc/qmail misc/remotemail misc/namefiles /mail/lib
diff --git a/src/cmd/upas/notes b/src/cmd/upas/notes
new file mode 100644
index 0000000..11905ac
--- /dev/null
+++ b/src/cmd/upas/notes
@@ -0,0 +1,50 @@
+upas:
+	from thread(3):
+		It is not safe to call rfork in a  threaded  program,  except  to  call
+		rfork(RFNOTEG) from the main proc before any other procs have been cre-
+		ated.  To create new processes, use proccreate.
+
+
+upas/fs:
+	when serving a file writes tbox.tmp when writing back tbox.
+	make L.mbox in home directory (sometimes)
+
+	=======> auth stuff:
+	Server, Certificate, ...
+	
+	    * POP3/IMAP Server (receiving emails): mail.physik.fu-berlin.de (unchanged)
+	    * SMTP Server (sending emails): mail.physik.fu-berlin.de (unchanged and not relevant for this change [no STARTTLS/SMTP_AUTH])
+	    * Certificate Authority (CA) Certificate: cacert.crt (CN=ZEDV)
+	      SHA1 Fingerprint: 37:19:00:47:BB:91:20:94:3B:AA:A7:75:57:D5:4C:0D:EA:5C:18:D9
+	      MD5 Fingerprint: 56:58:1C:91:DC:08:1B:42:D0:C2:D6:D4:FF:28:AE:C5
+	    * mail.physik.fu-berlin.de Fingerprints (IMAP/POP3):
+	      SHA1 Fingerprint: 75:C6:A5:1E:CB:F4:33:2E:95:85:A0:65:87:71:19:08:3D:19:FE:7D
+	      MD5 Fingerprint: 67:76:23:98:65:0A:39:44:5B:79:BD:91:31:49:59:7A
+	
+	The fingerprints can be displayed in the mail clients and can be optained using:
+	
+	openssl s_client -connect mail.physik.fu-berlin.de:993 -showcerts # IMAP
+	openssl s_client -connect mail.physik.fu-berlin.de:995 -showcerts # POP3
+	
+	Save all between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----
+	
+	openssl x509       -noout -fingerprint -in mail.physik.fu-berlin.de.pem # MD5
+	openssl x509 -sha1 -noout -fingerprint -in mail.physik.fu-berlin.de.pem # SHA1
+	
+	<======= auth stuff
+
+upas/ned:
+	need to understand singleton stuff.
+	
+	need to understand wait (cf lpdaemon.c ~315)  is it safe to fork in a threaded prog? shoud i use proccreate?
+	
+	routines to check/fix:
+		appendtofile()
+		switchmb()
+		rooted()
+		plumb() <= understand how this works, it may help in deciding how to present attachments in acme/Mail
+	
+
+upas/marshal:
+	some attachments work, some don't. looks like pdf files work while ps don't!? problem in body64()
+	actually, it seems like the size of attachment is the problem: large attacments don't seem to work, somewhere between 19967 and 161065 is the failure point.
\ No newline at end of file