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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/libregexp/regsub.c – Rev 2

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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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regsub(char *sp,	/* source string */
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	char *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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	char *ssp, *ep;
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	int i;
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	ep = dp+dlen-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!=0 && mp[i].sp != 0 && ms>i)
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					for(ssp = mp[i].sp;
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					     ssp < mp[i].ep;
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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 && mp[0].sp != 0 && ms>0)
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				for(ssp = mp[0].sp;
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				     ssp < mp[0].ep; 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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}