[src/trunk]: src/usr.bin/make make(1): fix possible return values for CondPar...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c944a783ac87
branches:  trunk
changeset: 950185:c944a783ac87
user:      rillig <rillig%NetBSD.org@localhost>
date:      Tue Jan 19 17:57:07 2021 +0000

description:
make(1): fix possible return values for CondParser_Term

The invalid return values didn't do any harm since CondParser_Factor and
CondParser_Expr passed them through, and CondParser_Eval carefully
checks for TOK_TRUE or TOK_FALSE and treats everything else as an error.

No change in observable behavior since there is no debug logging in that
part of the code.

diffstat:

 usr.bin/make/cond.c |  23 ++++++++---------------
 1 files changed, 8 insertions(+), 15 deletions(-)

diffs (53 lines):

diff -r 8263d21af405 -r c944a783ac87 usr.bin/make/cond.c
--- a/usr.bin/make/cond.c       Tue Jan 19 17:49:13 2021 +0000
+++ b/usr.bin/make/cond.c       Tue Jan 19 17:57:07 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cond.c,v 1.236 2021/01/19 17:49:13 rillig Exp $        */
+/*     $NetBSD: cond.c,v 1.237 2021/01/19 17:57:07 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -95,7 +95,7 @@
 #include "dir.h"
 
 /*     "@(#)cond.c     8.2 (Berkeley) 1/2/94"  */
-MAKE_RCSID("$NetBSD: cond.c,v 1.236 2021/01/19 17:49:13 rillig Exp $");
+MAKE_RCSID("$NetBSD: cond.c,v 1.237 2021/01/19 17:57:07 rillig Exp $");
 
 /*
  * The parsing of conditional expressions is based on this grammar:
@@ -924,14 +924,10 @@
        Token t;
 
        t = CondParser_Token(par, doEval);
+       if (t == TOK_TRUE || t == TOK_FALSE)
+               return t;
 
-       if (t == TOK_EOF) {
-               /*
-                * If we reached the end of the expression, the expression
-                * is malformed...
-                */
-               t = TOK_ERROR;
-       } else if (t == TOK_LPAREN) {
+       if (t == TOK_LPAREN) {
                /*
                 * T -> ( E )
                 */
@@ -948,13 +944,10 @@
                } else if (t == TOK_FALSE) {
                        t = TOK_TRUE;
                }
-       }
+       } else
+               return TOK_ERROR;
 
-       /*
-        * FIXME: Can at least return TOK_AND, TOK_OR, TOK_RPAREN, maybe
-        *  others as well.
-        */
-       /* TODO: assert(t == TOK_ERROR); */
+       assert(t == TOK_TRUE || t == TOK_FALSE || t == TOK_ERROR);
        return t;
 }