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Add plus() in lex.c

We have minus, so it is logical to have plus().

--- a/lex.c

+++ b/lex.c

@@ -182,6 +182,7 @@

 	register int c = getc(yyin);

 	yybuf[1] = c;

+	yybuf[2] = '\0';

 	switch (c) {

 	case '-': return DEC;

 	case '>': return INDIR;

@@ -194,6 +195,23 @@

 }

 static uint8_t

+plus(void)

+{

+	register int c = getc(yyin);

+

+	yybuf[1] = c;

+	yybuf[2] = '\0';

+	switch (c) {

+	case '+': return INC;

+	case '=': return ADD_EQ;

+	default:

+		yybuf[1] = '\0';

+		ungetc(c, yyin);

+		return '+';

+	}

+}

+

+static uint8_t

 relational(uint8_t op, uint8_t equal, uint8_t shift, uint8_t assig)

 {

 	register int c = getc(yyin);

@@ -220,7 +238,6 @@

 	switch (c) {

 	case '<': return relational('<', LE, SHL, SHL_EQ);

 	case '>': return relational('>', GE, SHR, SHR_EQ);

-	case '+': return follow('+', INC, follow('=', ADD_EQ, '+'));

 	case '=': return follow('=', EQ, '=');

 	case '^': return follow('=', XOR_EQ, '^');

 	case '*': return follow('=', MUL_EQ, '*');

@@ -229,6 +246,7 @@

 	case '&': return follow('=', AND_EQ, AND);

 	case '|': return follow('=', OR_EQ, OR);

 	case '-': return minus();

+	case '+': return plus();

 	default: return c;

 	}

 }