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#include <u.h>
#include <libc.h>
#include <regexp.h>
void
rregsub(Rune *src, Rune *dst, int dlen, Resub *match, int msize)
{
int i;
Rune *ep, r;
ep = dst + dlen-1;
for(;*src != L'\0'; src++) switch(*src) {
case L'\\':
switch(*++src) {
case L'0':
case L'1':
case L'2':
case L'3':
case L'4':
case L'5':
case L'6':
case L'7':
case L'8':
case L'9':
i = *src - L'0';
if(match != nil && i < msize && match[i].rsp != nil) {
r = *match[i].rep;
*match[i].rep = L'\0';
dst = runestrecpy(dst, ep+1, match[i].rsp);
*match[i].rep = r;
}
break;
case L'\\':
if(dst < ep)
*dst++ = L'\\';
else
goto End;
break;
case L'\0':
goto End;
default:
if(dst < ep)
*dst++ = *src;
else
goto End;
break;
}
break;
case L'&':
if(match != nil && msize > 0 && match[0].rsp != nil) {
r = *match[0].rep;
*match[0].rep = L'\0';
dst = runestrecpy(dst, ep+1, match[0].rsp);
*match[0].rep = r;
}
break;
default:
if(dst < ep)
*dst++ = *src;
else
goto End;
break;
}
End:
*dst = L'\0';
}
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