[src/trunk]: src/usr.bin/stat stat: fix undefined behavior when calling ctype...

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

details:   https://anonhg.NetBSD.org/src/rev/4cf28198d814
branches:  trunk
changeset: 1023149:4cf28198d814
user:      rillig <rillig%NetBSD.org@localhost>
date:      Fri Aug 27 18:11:07 2021 +0000

description:
stat: fix undefined behavior when calling ctype functions

lint says: warning: argument to 'function from <ctype.h>' must be cast
to 'unsigned char', not to 'unsigned int' [342]

diffstat:

 usr.bin/stat/stat.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (39 lines):

diff -r 96314fa538da -r 4cf28198d814 usr.bin/stat/stat.c
--- a/usr.bin/stat/stat.c       Fri Aug 27 18:09:30 2021 +0000
+++ b/usr.bin/stat/stat.c       Fri Aug 27 18:11:07 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: stat.c,v 1.46 2020/09/07 00:46:38 mrg Exp $ */
+/*     $NetBSD: stat.c,v 1.47 2021/08/27 18:11:07 rillig Exp $ */
 
 /*
  * Copyright (c) 2002-2011 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #if !defined(lint)
-__RCSID("$NetBSD: stat.c,v 1.46 2020/09/07 00:46:38 mrg Exp $");
+__RCSID("$NetBSD: stat.c,v 1.47 2021/08/27 18:11:07 rillig Exp $");
 #endif
 
 #if ! HAVE_NBTOOL_CONFIG_H
@@ -469,9 +469,9 @@
                } while (1/*CONSTCOND*/);
 
                size = -1;
-               if (isdigit((unsigned)*statfmt)) {
+               if (isdigit((unsigned char)*statfmt)) {
                        size = 0;
-                       while (isdigit((unsigned)*statfmt)) {
+                       while (isdigit((unsigned char)*statfmt)) {
                                size = (size * 10) + (*statfmt - '0');
                                statfmt++;
                                if (size < 0)
@@ -484,7 +484,7 @@
                        statfmt++;
 
                        prec = 0;
-                       while (isdigit((unsigned)*statfmt)) {
+                       while (isdigit((unsigned char)*statfmt)) {
                                prec = (prec * 10) + (*statfmt - '0');
                                statfmt++;
                                if (prec < 0)