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List:       busybox
Subject:    [PATCH] dd: support skip and seek values greater than 2G on android
From:       Tanguy Pruvot <tanguy.pruvot () gmail ! com>
Date:       2012-07-30 18:53:23
Message-ID: 357381493.20120730205323 () gmail ! com
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http://review.cyanogenmod.com/20215

it could be useful to keep a bs=1 to get exact positions.
bionic fail to use the CONFIG_LFS flag to support large offsets,
this workaround fix the function on /dev/mem or /dev/kmem inputs

required to dump part of kernel code or memory like :
busybox dd bs=1 count=156 skip=$((0xC0035EF0)) if=/dev/kmem of=/tmp/func.dump

Post-Joint : 0001-dd-support-skip-and-seek-values-greater-than-2G-on-a.patch.
["0001-dd-support-skip-and-seek-values-greater-than-2G-on-a.patch" (application/octet-stream)]

From 6a025ba7107abe0c46a29c023ea54262c0dda26a Mon Sep 17 00:00:00 2001
From: Tanguy Pruvot <tanguy.pruvot@gmail.com>
Date: Fri, 27 Jul 2012 02:01:00 +0200
Subject: [PATCH] dd: support skip and seek values greater than 2G on android

it could be useful to keep a bs=1 to get exact positions.
bionic fail to use the CONFIG_LFS flag to support large offsets,
this workaround fix the function on /dev/mem or /dev/kmem inputs

Change-Id: I7fc951b001f065e02254037da2a1e61520e20282
---
 coreutils/dd.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/coreutils/dd.c b/coreutils/dd.c
index 96602eb..bce98c4 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -208,7 +208,7 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
 		int flags;
 		size_t oc;
 		off_t count;
-		off_t seek, skip;
+		uoff_t seek, skip;
 		const char *infile, *outfile;
 	} Z;
 #define flags   (Z.flags  )
@@ -344,6 +344,20 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
 	} else {
 		outfile = bb_msg_standard_output;
 	}
+#if (!ENABLE_LFS) && defined(ANDROID)
+	if (skip) {
+		if (lseek64(ifd, skip * ibs, SEEK_SET) == (off64_t) -1)
+			fprintf(stderr, "warning: skip lseek64 failed\n");
+		else
+			skip = 0;
+	}
+	if (seek) {
+		if (lseek64(ifd, seek * obs, SEEK_SET) == (off64_t) -1)
+			fprintf(stderr, "warning: seek lseek64 failed\n");
+		else
+			seek = 0;
+	}
+#endif
 	if (skip) {
 		if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
 			while (skip-- > 0) {
-- 
1.7.10



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