Subversion Repositories planix.SVN

#include        <u.h>
#include        <libc.h>
#include        <stdio.h>

extern  char    yytext[];
extern  int     yyleng;
extern  int     yyprevious;

void    yyunput(int c);

void
yyless(int x)
{
        char *lastch, *ptr;

        lastch = yytext+yyleng;
        if(x>=0 && x <= yyleng)
                ptr = x + yytext;
        else
                ptr = (char*)x;
        while(lastch > ptr)
                yyunput(*--lastch);
        *lastch = 0;
        if (ptr >yytext)
                yyprevious = lastch[-1];
        yyleng = ptr-yytext;
}