4.3BSD - /usr/src/usr.lib/libln/yyless.c

   1: /*	@(#)yyless.c	4.2	1/9/85	*/
   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: }

Defined functions