From 0f8168038af32828fcdc39575dea0e4de0c01122 Mon Sep 17 00:00:00 2001
From: ben <ben@rana>
Date: Tue, 26 Apr 2016 22:26:03 -0500
Subject: [PATCH] remove old libregexp files; add headers for upas/bayes

---
 .../{libregexp => cmd/upas/bayes}/regcomp.h   |   0
 sys/src/cmd/upas/bayes/regexp.h               |  66 ++++++++++
 sys/src/libregexp/regaux.c                    | 113 ------------------
 3 files changed, 66 insertions(+), 113 deletions(-)
 rename sys/src/{libregexp => cmd/upas/bayes}/regcomp.h (100%)
 create mode 100644 sys/src/cmd/upas/bayes/regexp.h
 delete mode 100644 sys/src/libregexp/regaux.c

diff --git a/sys/src/libregexp/regcomp.h b/sys/src/cmd/upas/bayes/regcomp.h
similarity index 100%
rename from sys/src/libregexp/regcomp.h
rename to sys/src/cmd/upas/bayes/regcomp.h
diff --git a/sys/src/cmd/upas/bayes/regexp.h b/sys/src/cmd/upas/bayes/regexp.h
new file mode 100644
index 000000000..780dc8001
--- /dev/null
+++ b/sys/src/cmd/upas/bayes/regexp.h
@@ -0,0 +1,66 @@
+#pragma	src	"/sys/src/oldlibregexp"
+#pragma	lib	"oldlibregexp.a"
+
+typedef struct Resub		Resub;
+typedef struct Reclass		Reclass;
+typedef struct Reinst		Reinst;
+typedef struct Reprog		Reprog;
+
+/*
+ *	Sub expression matches
+ */
+struct Resub{
+	union
+	{
+		char *sp;
+		Rune *rsp;
+	};
+	union
+	{
+		char *ep;
+		Rune *rep;
+	};
+};
+
+/*
+ *	character class, each pair of rune's defines a range
+ */
+struct Reclass{
+	Rune	*end;
+	Rune	spans[64];
+};
+
+/*
+ *	Machine instructions
+ */
+struct Reinst{
+	int	type;
+	union	{
+		Reclass	*cp;		/* class pointer */
+		Rune	r;		/* character */
+		int	subid;		/* sub-expression id for RBRA and LBRA */
+		Reinst	*right;		/* right child of OR */
+	};
+	union {	/* regexp relies on these two being in the same union */
+		Reinst *left;		/* left child of OR */
+		Reinst *next;		/* next instruction for CAT & LBRA */
+	};
+};
+
+/*
+ *	Reprogram definition
+ */
+struct Reprog{
+	Reinst	*startinst;	/* start pc */
+	Reclass	class[16];	/* .data */
+	Reinst	firstinst[5];	/* .text */
+};
+
+extern Reprog	*regcomp(char*);
+extern Reprog	*regcomplit(char*);
+extern Reprog	*regcompnl(char*);
+extern void	regerror(char*);
+extern int	regexec(Reprog*, char*, Resub*, int);
+extern void	regsub(char*, char*, int, Resub*, int);
+extern int	rregexec(Reprog*, Rune*, Resub*, int);
+extern void	rregsub(Rune*, Rune*, int, Resub*, int);
diff --git a/sys/src/libregexp/regaux.c b/sys/src/libregexp/regaux.c
deleted file mode 100644
index a7d52eca8..000000000
--- a/sys/src/libregexp/regaux.c
+++ /dev/null
@@ -1,113 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include "regexp.h"
-#include "regcomp.h"
-
-
-/*
- *  save a new match in mp
- */
-extern void
-_renewmatch(Resub *mp, int ms, Resublist *sp)
-{
-	int i;
-
-	if(mp==0 || ms<=0)
-		return;
-	if(mp[0].sp==0 || sp->m[0].sp<mp[0].sp ||
-	   (sp->m[0].sp==mp[0].sp && sp->m[0].ep>mp[0].ep)){
-		for(i=0; i<ms && i<NSUBEXP; i++)
-			mp[i] = sp->m[i];
-		for(; i<ms; i++)
-			mp[i].sp = mp[i].ep = 0;
-	}
-}
-
-/*
- * Note optimization in _renewthread:
- * 	*lp must be pending when _renewthread called; if *l has been looked
- *		at already, the optimization is a bug.
- */
-extern Relist*
-_renewthread(Relist *lp,	/* _relist to add to */
-	Reinst *ip,		/* instruction to add */
-	int ms,
-	Resublist *sep)		/* pointers to subexpressions */
-{
-	Relist *p;
-
-	for(p=lp; p->inst; p++){
-		if(p->inst == ip){
-			if(sep->m[0].sp < p->se.m[0].sp){
-				if(ms > 1)
-					p->se = *sep;
-				else
-					p->se.m[0] = sep->m[0];
-			}
-			return 0;
-		}
-	}
-	p->inst = ip;
-	if(ms > 1)
-		p->se = *sep;
-	else
-		p->se.m[0] = sep->m[0];
-	(++p)->inst = 0;
-	return p;
-}
-
-/*
- * same as renewthread, but called with
- * initial empty start pointer.
- */
-extern Relist*
-_renewemptythread(Relist *lp,	/* _relist to add to */
-	Reinst *ip,		/* instruction to add */
-	int ms,
-	char *sp)		/* pointers to subexpressions */
-{
-	Relist *p;
-
-	for(p=lp; p->inst; p++){
-		if(p->inst == ip){
-			if(sp < p->se.m[0].sp) {
-				if(ms > 1)
-					memset(&p->se, 0, sizeof(p->se));
-				p->se.m[0].sp = sp;
-			}
-			return 0;
-		}
-	}
-	p->inst = ip;
-	if(ms > 1)
-		memset(&p->se, 0, sizeof(p->se));
-	p->se.m[0].sp = sp;
-	(++p)->inst = 0;
-	return p;
-}
-
-extern Relist*
-_rrenewemptythread(Relist *lp,	/* _relist to add to */
-	Reinst *ip,		/* instruction to add */
-	int ms,
-	Rune *rsp)		/* pointers to subexpressions */
-{
-	Relist *p;
-
-	for(p=lp; p->inst; p++){
-		if(p->inst == ip){
-			if(rsp < p->se.m[0].rsp) {
-				if(ms > 1)
-					memset(&p->se, 0, sizeof(p->se));
-				p->se.m[0].rsp = rsp;
-			}
-			return 0;
-		}
-	}
-	p->inst = ip;
-	if(ms > 1)
-		memset(&p->se, 0, sizeof(p->se));
-	p->se.m[0].rsp = rsp;
-	(++p)->inst = 0;
-	return p;
-}