1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
#include "lib9.h"
#include "regexp9.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].s.sp==0 || sp->m[0].s.sp<mp[0].s.sp ||
(sp->m[0].s.sp==mp[0].s.sp && sp->m[0].e.ep>mp[0].e.ep)){
for(i=0; i<ms && i<NSUBEXP; i++)
mp[i] = sp->m[i];
for(; i<ms; i++)
mp[i].s.sp = mp[i].e.ep = 0;
}
}
/*
* Add ip to the list [lp, elp], but only if it is not there already.
* These work lists are stored and processed in increasing
* order of sp[0], so if the ip is there already, the one that's
* there already is a more left match and takes priority.
*/
static Relist*
_renewthread1(Relist *lp, /* Relist to add to */
Relist *elp, /* limit pointer for Relist */
Reinst *ip, /* instruction to add */
int ms,
Resublist *sep) /* pointers to subexpressions */
{
Relist *p;
for(p=lp; p->inst; p++)
if(p->inst == ip)
return 0;
if(p == elp) /* refuse to overflow buffer */
return elp;
p->inst = ip;
if(ms > 1)
p->se = *sep;
else
p->se.m[0] = sep->m[0];
(p+1)->inst = 0;
return p;
}
extern int
_renewthread(Relist *lp, Relist *elp, Reinst *ip, int ms, Resublist *sep)
{
Relist *ap;
ap = _renewthread1(lp, elp, ip, ms, sep);
if(ap == 0)
return 0;
if(ap == elp)
return -1;
/*
* Added ip to list at ap.
* Expand any ORs right now, so that entire
* work list ends up being sorted by increasing m[0].sp.
*/
for(; ap->inst; ap++){
if(ap->inst->type == OR){
if(_renewthread1(lp, elp, ap->inst->u1.right, ms, &ap->se) == elp)
return -1;
if(_renewthread1(lp, elp, ap->inst->u2.next, ms, &ap->se) == elp)
return -1;
}
}
return 0;
}
/*
* same as renewthread, but called with
* initial empty start pointer.
*/
extern int
_renewemptythread(Relist *lp, /* _relist to add to */
Relist *elp,
Reinst *ip, /* instruction to add */
int ms,
char *sp) /* pointers to subexpressions */
{
Resublist sep;
if(ms > 1)
memset(&sep, 0, sizeof sep);
sep.m[0].s.sp = sp;
sep.m[0].e.ep = 0;
return _renewthread(lp, elp, ip, ms, &sep);
}
extern int
_rrenewemptythread(Relist *lp, /* _relist to add to */
Relist *elp,
Reinst *ip, /* instruction to add */
int ms,
Rune *rsp) /* pointers to subexpressions */
{
return _renewemptythread(lp, elp, ip, ms, (char*)rsp);
}
|