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- 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
- ptr = x;
- while (lastch > ptr)
- yyunput(*--lastch);
- *lastch = 0;
- if (ptr >yytext)
- yyprevious = *--lastch;
- yyleng = ptr-yytext;
- }
-