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