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https://github.com/0intro/wmii
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64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
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#include "plan9.h"
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#include "regexp9.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[i].s.sp != 0 && mp!=0 && ms>i)
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for(ssp = mp[i].s.sp;
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ssp < mp[i].e.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].s.sp != 0 && mp!=0 && ms>0)
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if(mp[0].s.sp != 0)
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for(ssp = mp[0].s.sp;
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ssp < mp[0].e.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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}
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