[src/trunk]: src/bin/dd copy libc's swab.c into dd as dd_swab(), and remove t...

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

details:   https://anonhg.NetBSD.org/src/rev/f6a6e9380023
branches:  trunk
changeset: 845493:f6a6e9380023
user:      mrg <mrg%NetBSD.org@localhost>
date:      Fri Oct 04 08:57:37 2019 +0000

description:
copy libc's swab.c into dd as dd_swab(), and remove the restrict.

our implementation was fine, but the restrict marker is problematic
as gcc 8 is now more strict about checking for restrict issues.

this is the only actual consumer of swab(3) in our tree, though,
besides the test for it.  oh well.

diffstat:

 bin/dd/Makefile  |   4 +-
 bin/dd/dd.c      |   6 ++--
 bin/dd/dd_swab.c |  83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 bin/dd/extern.h  |   4 ++-
 4 files changed, 91 insertions(+), 6 deletions(-)

diffs (145 lines):

diff -r b8df5c377ac3 -r f6a6e9380023 bin/dd/Makefile
--- a/bin/dd/Makefile   Fri Oct 04 08:51:32 2019 +0000
+++ b/bin/dd/Makefile   Fri Oct 04 08:57:37 2019 +0000
@@ -1,10 +1,10 @@
-#      $NetBSD: Makefile,v 1.19 2019/09/15 23:58:31 kamil Exp $
+#      $NetBSD: Makefile,v 1.20 2019/10/04 08:57:37 mrg Exp $
 #      @(#)Makefile    8.1 (Berkeley) 5/31/93
 
 .include <bsd.own.mk>
 
 RUMPPRG=dd
-SRCS=  args.c conv.c dd.c misc.c position.c
+SRCS=  args.c conv.c dd.c dd_swab.c misc.c position.c
 
 DPADD+=        ${LIBUTIL}
 LDADD+=        -lutil
diff -r b8df5c377ac3 -r f6a6e9380023 bin/dd/dd.c
--- a/bin/dd/dd.c       Fri Oct 04 08:51:32 2019 +0000
+++ b/bin/dd/dd.c       Fri Oct 04 08:57:37 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dd.c,v 1.52 2019/03/23 09:33:16 mlelstv Exp $  */
+/*     $NetBSD: dd.c,v 1.53 2019/10/04 08:57:37 mrg Exp $      */
 
 /*-
  * Copyright (c) 1991, 1993, 1994
@@ -43,7 +43,7 @@
 #if 0
 static char sccsid[] = "@(#)dd.c       8.5 (Berkeley) 4/2/94";
 #else
-__RCSID("$NetBSD: dd.c,v 1.52 2019/03/23 09:33:16 mlelstv Exp $");
+__RCSID("$NetBSD: dd.c,v 1.53 2019/10/04 08:57:37 mrg Exp $");
 #endif
 #endif /* not lint */
 
@@ -456,7 +456,7 @@
                                ++st.swab;
                                --n;
                        }
-                       swab(in.dbp, in.dbp, n);
+                       dd_swab(in.dbp, in.dbp, n);
                }
 
                in.dbp += in.dbrcnt;
diff -r b8df5c377ac3 -r f6a6e9380023 bin/dd/dd_swab.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/bin/dd/dd_swab.c  Fri Oct 04 08:57:37 2019 +0000
@@ -0,0 +1,83 @@
+/*     $NetBSD: dd_swab.c,v 1.1 2019/10/04 08:57:38 mrg Exp $  */
+
+/*
+ * Copyright (c) 1988, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jeffrey Mogul.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: NetBSD: swab.c,v 1.18 2011/01/04 17:14:07 martin Exp
+ */
+
+/* This copy has no restrict on it, that dd wants */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)swab.c     8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: dd_swab.c,v 1.1 2019/10/04 08:57:38 mrg Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+
+#include "dd.h"
+#include "extern.h"
+
+void
+dd_swab(const void * from, void * to, ssize_t len)
+{
+       char temp;
+       const char *fp;
+       char *tp;
+
+       if (len <= 1)
+               return;
+
+       len /= 2;
+       fp = (const char *)from;
+       tp = (char *)to;
+#define        STEP    temp = *fp++,*tp++ = *fp++,*tp++ = temp
+
+       if (__predict_false(len == 1)) {
+               STEP;
+               return;
+       }
+
+       /* round to multiple of 8 */
+       while ((--len % 8) != 0)
+               STEP;
+       len /= 8;
+       if (len == 0)
+               return;
+       while (len-- != 0) {
+               STEP; STEP; STEP; STEP;
+               STEP; STEP; STEP; STEP;
+       }
+}
diff -r b8df5c377ac3 -r f6a6e9380023 bin/dd/extern.h
--- a/bin/dd/extern.h   Fri Oct 04 08:51:32 2019 +0000
+++ b/bin/dd/extern.h   Fri Oct 04 08:57:37 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: extern.h,v 1.23 2015/03/18 13:23:49 manu Exp $ */
+/*     $NetBSD: extern.h,v 1.24 2019/10/04 08:57:38 mrg Exp $  */
 
 /*-
  * Copyright (c) 1991, 1993, 1994
@@ -84,3 +84,5 @@
 extern const u_char    a2ibm_32V[], a2ibm_POSIX[];
 extern u_char          casetab[];
 extern const char      *msgfmt;
+
+void dd_swab(const void *, void *, ssize_t len);