#ifndef lint
static	char sccsid[] = "@(#)yyless.c 1.1 92/07/30 SMI"; /* from UCB S5R2 1.4 */
#endif

yyless(x)
{
extern char yytext[];
register char *lastch, *ptr;
extern int yyleng;
extern int yyprevious;
lastch = yytext+yyleng;
if (x>=0 && x <= yyleng)
	ptr = x + yytext;
else
	/*
	 * The cast on the next line papers over an unconscionable nonportable
	 * glitch to allow the caller to hand the function a pointer instead of
	 * an integer and hope that it gets figured out properly.  But it's
	 * that way on all systems .   
	 */
	ptr = (char *) x;
while (lastch > ptr)
	yyunput(*--lastch);
*lastch = 0;
if (ptr >yytext)
	yyprevious = *--lastch;
yyleng = ptr-yytext;
}