1 #include "lib9.h"
2 #include "regexp9.h"
3 
4 /* substitute into one string using the matches from the last regexec() */
5 extern	void
6 rregsub(Rune *sp,	/* source string */
7 	Rune *dp,	/* destination string */
8 	int dlen,
9 	Resub *mp,	/* subexpression elements */
10 	int ms)		/* number of elements pointed to by mp */
11 {
12 	Rune *ssp, *ep;
13 	int i;
14 
15 	ep = dp+(dlen/sizeof(Rune))-1;
16 	while(*sp != '\0'){
17 		if(*sp == '\\'){
18 			switch(*++sp){
19 			case '0':
20 			case '1':
21 			case '2':
22 			case '3':
23 			case '4':
24 			case '5':
25 			case '6':
26 			case '7':
27 			case '8':
28 			case '9':
29 				i = *sp-'0';
30 				if(mp!=0 && mp[i].s.rsp != 0 && ms>i)
31 					for(ssp = mp[i].s.rsp;
32 					     ssp < mp[i].e.rep;
33 					     ssp++)
34 						if(dp < ep)
35 							*dp++ = *ssp;
36 				break;
37 			case '\\':
38 				if(dp < ep)
39 					*dp++ = '\\';
40 				break;
41 			case '\0':
42 				sp--;
43 				break;
44 			default:
45 				if(dp < ep)
46 					*dp++ = *sp;
47 				break;
48 			}
49 		}else if(*sp == '&'){
50 			if(mp!=0 && mp[0].s.rsp != 0 && ms>0)
51 				for(ssp = mp[0].s.rsp;
52 				     ssp < mp[0].e.rep; ssp++)
53 					if(dp < ep)
54 						*dp++ = *ssp;
55 		}else{
56 			if(dp < ep)
57 				*dp++ = *sp;
58 		}
59 		sp++;
60 	}
61 	*dp = '\0';
62 }