Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include "regexp.h"

/* substitute into one string using the matches from the last regexec() */
extern  void
rregsub(Rune *sp,       /* source string */
        Rune *dp,       /* destination string */
        int dlen,
        Resub *mp,      /* subexpression elements */
        int ms)         /* number of elements pointed to by mp */
{
        Rune *ssp, *ep;
        int i;

        ep = dp+(dlen/sizeof(Rune))-1;
        while(*sp != '\0'){
                if(*sp == '\\'){
                        switch(*++sp){
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                                i = *sp-'0';
                                if(mp[i].rsp != 0 && mp!=0 && ms>i)
                                        for(ssp = mp[i].rsp;
                                             ssp < mp[i].rep;
                                             ssp++)
                                                if(dp < ep)
                                                        *dp++ = *ssp;
                                break;
                        case '\\':
                                if(dp < ep)
                                        *dp++ = '\\';
                                break;
                        case '\0':
                                sp--;
                                break;
                        default:
                                if(dp < ep)
                                        *dp++ = *sp;
                                break;
                        }
                }else if(*sp == '&'){                           
                        if(mp[0].rsp != 0 && mp!=0 && ms>0)
                        if(mp[0].rsp != 0)
                                for(ssp = mp[0].rsp;
                                     ssp < mp[0].rep; ssp++)
                                        if(dp < ep)
                                                *dp++ = *ssp;
                }else{
                        if(dp < ep)
                                *dp++ = *sp;
                }
                sp++;
        }
        *dp = '\0';
}