[src/trunk]: src/usr.bin/make make(1): fix parsing of nested braces in depend...

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

details:   https://anonhg.NetBSD.org/src/rev/e7445b1b21a8
branches:  trunk
changeset: 936602:e7445b1b21a8
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Jul 31 19:06:33 2020 +0000

description:
make(1): fix parsing of nested braces in dependency lines

Before, make could not parse {{thi,fou}r,fif}teen properly. It did
correctly split up the outer brace into "" + "{thi,fou}r,fif" + "teen",
but then, when expanding the inner braces, it interpreted the first
comma already as a separator, even though this comma was enclosed in
another set of braces.

This resulted in the wrong expansion "{thiteen", which produced the
error message.  The next word "fouteen" was produced since the parser
stopped at the next closing brace.  After this, parsing continued after
the closing brace, producing "rteen".  Finally, the last expansion was
the correct "fifteen".

diffstat:

 usr.bin/make/dir.c              |  17 +++++++++--------
 usr.bin/make/unit-tests/dir.exp |   6 ++----
 2 files changed, 11 insertions(+), 12 deletions(-)

diffs (62 lines):

diff -r 9093ac7b09a7 -r e7445b1b21a8 usr.bin/make/dir.c
--- a/usr.bin/make/dir.c        Fri Jul 31 17:41:35 2020 +0000
+++ b/usr.bin/make/dir.c        Fri Jul 31 19:06:33 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dir.c,v 1.78 2020/07/31 17:41:35 rillig Exp $  */
+/*     $NetBSD: dir.c,v 1.79 2020/07/31 19:06:33 rillig Exp $  */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -70,14 +70,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: dir.c,v 1.78 2020/07/31 17:41:35 rillig Exp $";
+static char rcsid[] = "$NetBSD: dir.c,v 1.79 2020/07/31 19:06:33 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)dir.c      8.2 (Berkeley) 1/2/94";
 #else
-__RCSID("$NetBSD: dir.c,v 1.78 2020/07/31 17:41:35 rillig Exp $");
+__RCSID("$NetBSD: dir.c,v 1.79 2020/07/31 19:06:33 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -715,12 +715,13 @@
         * Find the end of this piece of the clause.
         */
        bracelevel = 0;
-       while (*cp != ',') {
-           if (*cp == '{') {
+       while (*cp != '\0') {
+           if ((*cp == ',' || *cp == '}') && bracelevel == 0)
+               break;
+           if (*cp == '{')
                bracelevel++;
-           } else if ((*cp == '}') && (bracelevel-- <= 0)) {
-               break;
-           }
+           if (*cp == '}')
+               bracelevel--;
            cp++;
        }
        /*
diff -r 9093ac7b09a7 -r e7445b1b21a8 usr.bin/make/unit-tests/dir.exp
--- a/usr.bin/make/unit-tests/dir.exp   Fri Jul 31 17:41:35 2020 +0000
+++ b/usr.bin/make/unit-tests/dir.exp   Fri Jul 31 19:06:33 2020 +0000
@@ -1,11 +1,9 @@
-make: Unterminated {} clause "thiteen"
 1
 2
 3
 4
 5
-make: don't know how to make fouteen (continuing)
-make: don't know how to make rteen (continuing)
+13
+14
 15
-`all' not remade because of errors.
 exit status 0