[src/trunk]: src/usr.bin/xlint/lint1 lint: fix lexical analysis of character ...

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

details:   https://anonhg.NetBSD.org/src/rev/8dd7665b3cdc
branches:  trunk
changeset: 379957:8dd7665b3cdc
user:      rillig <rillig%NetBSD.org@localhost>
date:      Tue Jun 29 07:23:21 2021 +0000

description:
lint: fix lexical analysis of character constants in traditional C

The code now follows the wording of the C Reference Manual from 1978.

diffstat:

 tests/usr.bin/xlint/lint1/msg_077.c   |  3 ++-
 tests/usr.bin/xlint/lint1/msg_077.exp |  1 +
 usr.bin/xlint/lint1/lex.c             |  9 +++------
 3 files changed, 6 insertions(+), 7 deletions(-)

diffs (51 lines):

diff -r 3ae4cc8f2652 -r 8dd7665b3cdc tests/usr.bin/xlint/lint1/msg_077.c
--- a/tests/usr.bin/xlint/lint1/msg_077.c       Tue Jun 29 07:17:43 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/msg_077.c       Tue Jun 29 07:23:21 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: msg_077.c,v 1.3 2021/06/29 07:17:43 rillig Exp $       */
+/*     $NetBSD: msg_077.c,v 1.4 2021/06/29 07:23:21 rillig Exp $       */
 # 3 "msg_077.c"
 
 /* Test for message: bad octal digit %c [77] */
@@ -22,4 +22,5 @@ char single_digit = '\8';     /* expect: bad
  * anyway.
  * https://mail-index.netbsd.org/tech-toolchain/2021/03/16/msg003933.html
  */
+/* expect+1: multi-character character constant [294] */
 char several_digits = '\08';
diff -r 3ae4cc8f2652 -r 8dd7665b3cdc tests/usr.bin/xlint/lint1/msg_077.exp
--- a/tests/usr.bin/xlint/lint1/msg_077.exp     Tue Jun 29 07:17:43 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/msg_077.exp     Tue Jun 29 07:23:21 2021 +0000
@@ -1,1 +1,2 @@
 msg_077.c(8): warning: bad octal digit 8 [77]
+msg_077.c(26): warning: multi-character character constant [294]
diff -r 3ae4cc8f2652 -r 8dd7665b3cdc usr.bin/xlint/lint1/lex.c
--- a/usr.bin/xlint/lint1/lex.c Tue Jun 29 07:17:43 2021 +0000
+++ b/usr.bin/xlint/lint1/lex.c Tue Jun 29 07:23:21 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: lex.c,v 1.46 2021/06/20 20:32:42 rillig Exp $ */
+/* $NetBSD: lex.c,v 1.47 2021/06/29 07:23:21 rillig Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -38,7 +38,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID) && !defined(lint)
-__RCSID("$NetBSD: lex.c,v 1.46 2021/06/20 20:32:42 rillig Exp $");
+__RCSID("$NetBSD: lex.c,v 1.47 2021/06/29 07:23:21 rillig Exp $");
 #endif
 
 #include <ctype.h>
@@ -987,10 +987,7 @@ get_escaped_char(int delim)
                        do {
                                v = (v << 3) + (c - '0');
                                c = inpc();
-                       } while (--n > 0 && isdigit(c) && (tflag || c <= '7'));
-                       if (tflag && n > 0 && isdigit(c))
-                               /* bad octal digit %c */
-                               warning(77, c);
+                       } while (--n > 0 && '0' <= c && c <= '7');
                        pbc = c;
                        if (v > TARG_UCHAR_MAX) {
                                /* character escape does not fit in character */