74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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#include "regexp.h"
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/* substitute into one string using the matches from the last regexec() */
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extern void
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rregsub(Rune *sp, /* source string */
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Rune *dp, /* destination string */
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int dlen,
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Resub *mp, /* subexpression elements */
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int ms) /* number of elements pointed to by mp */
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{
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Rune *ssp, *ep;
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int i;
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ep = dp+(dlen/sizeof(Rune))-1;
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while(*sp != '\0'){
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if(*sp == '\\'){
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switch(*++sp){
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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i = *sp-'0';
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if(mp[i].rsp != 0 && mp!=0 && ms>i)
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for(ssp = mp[i].rsp;
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ssp < mp[i].rep;
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ssp++)
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if(dp < ep)
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*dp++ = *ssp;
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break;
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case '\\':
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if(dp < ep)
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*dp++ = '\\';
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break;
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case '\0':
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sp--;
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break;
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default:
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if(dp < ep)
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*dp++ = *sp;
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break;
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}
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}else if(*sp == '&'){
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if(mp[0].rsp != 0 && mp!=0 && ms>0)
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if(mp[0].rsp != 0)
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for(ssp = mp[0].rsp;
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ssp < mp[0].rep; ssp++)
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if(dp < ep)
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*dp++ = *ssp;
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}else{
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if(dp < ep)
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*dp++ = *sp;
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}
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sp++;
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}
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*dp = '\0';
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}
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