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Add yylen variable

This variable holds the length of the current lexem.

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -29,6 +29,7 @@

 uint8_t yytoken;

 struct yystype yylval;

 char yytext[IDENTSIZ + 1];

+unsigned short yylen;

 static uint8_t safe;

 static Input *input;

@@ -206,12 +207,10 @@

 static void

 tok2str(void)

 {

-	size_t len;

-

-	if ((len = input->p - input->begin) > IDENTSIZ)

+	if ((yylen = input->p - input->begin) > IDENTSIZ)

 		error("token too big");

-	strncpy(yytext, input->begin, len);

-	yytext[len] = '\0';

+	strncpy(yytext, input->begin, yylen);

+	yytext[yylen] = '\0';

 	fprintf(stderr ,"%s\n", yytext);

 	input->begin = input->p;

 }