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	rregsub.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	---
	rregsub.c (1156B)
	---
	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[i].s.rsp != 0 && mp!=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].s.rsp != 0 && mp!=0 && ms>0)
	51 if(mp[0].s.rsp != 0)
	52 for(ssp = mp[0].s.rsp;
	53 ssp < mp[0].e.rep; ssp++)
	54 if(dp < ep)
	55 dp++ = ssp;
	56 }else{
	57 if(dp < ep)
	58 dp++ = sp;
	59 }
	60 sp++;
	61 }
	62 *dp = '\0';
	63 }