1 /* @(#)yyless.c 4.2 01/09/85 */ 2 3 yyless(x) 4 { 5 extern char yytext[]; 6 register char *lastch, *ptr; 7 extern int yyleng; 8 extern int yyprevious; 9 lastch = yytext+yyleng; 10 if (x>=0 && x <= yyleng) 11 ptr = x + yytext; 12 else 13 ptr = (char *) x; 14 while (lastch > ptr) 15 yyunput(*--lastch); 16 *lastch = 0; 17 if (ptr >yytext) 18 yyprevious = *--lastch; 19 yyleng = ptr-yytext; 20 } 21