xref: /plan9/sys/src/ape/lib/regexp/regaux.c (revision 3e12c5d1bb89fc02707907988834ef147769ddaf)
1 #include <stdlib.h>
2 #include <stdio.h>
3 #include "regexp.h"
4 #include "regcomp.h"
5 
6 /*
7  *	Machine state
8  */
9 Relist*	_relist[2];
10 Relist*	_reliste[2];
11 int	_relistsize = LISTINCREMENT;
12 
13 /*
14  *  save a new match in mp
15  */
16 extern void
_renewmatch(Resub * mp,int ms,Resublist * sp)17 _renewmatch(Resub *mp, int ms, Resublist *sp)
18 {
19 	int i;
20 
21 	if(mp==0 || ms<=0)
22 		return;
23 	if(mp[0].s.sp==0 || sp->m[0].s.sp<mp[0].s.sp ||
24 	   (sp->m[0].s.sp==mp[0].s.sp && sp->m[0].e.ep>mp[0].e.ep)){
25 		for(i=0; i<ms && i<NSUBEXP; i++)
26 			mp[i] = sp->m[i];
27 		for(; i<ms; i++)
28 			mp[i].s.sp = mp[i].e.ep = 0;
29 	}
30 }
31 
32 /*
33  * Note optimization in _renewthread:
34  * 	*lp must be pending when _renewthread called; if *l has been looked
35  *		at already, the optimization is a bug.
36  */
37 extern Relist*
_renewthread(Relist * lp,Reinst * ip,Resublist * sep)38 _renewthread(Relist *lp,	/* _relist to add to */
39 	Reinst *ip,	/* instruction to add */
40 	Resublist *sep)	/* pointers to subexpressions */
41 {
42 	Relist *p;
43 
44 	for(p=lp; p->inst; p++){
45 		if(p->inst == ip){
46 			if((sep)->m[0].s.sp < p->se.m[0].s.sp)
47 				p->se = *sep;
48 			return 0;
49 		}
50 	}
51 	p->inst = ip;
52 	p->se = *sep;
53 	(++p)->inst = 0;
54 	return p;
55 }
56 
57