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authorGravatar Rostislav Skudnov <rostislav@tuxera.com>2019-02-06 11:57:15 +0000
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-02-14 13:01:46 +0100
commitd712edc6d8f904a4e9d2e26fc9e8a4c45a2cf0b0 (patch)
tree63742d158c4591be44d895fb862659d40021369b
parentf81e0120f4478c58e126bcadb19b9954ed184e8f (diff)
downloadbusybox-d712edc6d8f904a4e9d2e26fc9e8a4c45a2cf0b0.tar.gz
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dd: add 'oflag=append'
Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--coreutils/dd.c16
-rw-r--r--docs/posix_conformance.txt1
2 files changed, 11 insertions, 6 deletions
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 4b31e9a7b..2fb9da77c 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -59,7 +59,7 @@
//usage: "[if=FILE] [of=FILE] [" IF_FEATURE_DD_IBS_OBS("ibs=N obs=N/") "bs=N] [count=N] [skip=N] [seek=N]\n"
//usage: IF_FEATURE_DD_IBS_OBS(
//usage: " [conv=notrunc|noerror|sync|fsync]\n"
-//usage: " [iflag=skip_bytes|fullblock] [oflag=seek_bytes]"
+//usage: " [iflag=skip_bytes|fullblock] [oflag=seek_bytes|append]"
//usage: )
//usage:#define dd_full_usage "\n\n"
//usage: "Copy a file with converting and formatting\n"
@@ -84,6 +84,7 @@
//usage: "\n iflag=skip_bytes skip=N is in bytes"
//usage: "\n iflag=fullblock Read full blocks"
//usage: "\n oflag=seek_bytes seek=N is in bytes"
+//usage: "\n oflag=append Open output file in append mode"
//usage: )
//usage: IF_FEATURE_DD_STATUS(
//usage: "\n status=noxfer Suppress rate output"
@@ -140,11 +141,12 @@ enum {
/* start of output flags */
FLAG_OFLAG_SHIFT = 7,
FLAG_SEEK_BYTES = (1 << 7) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_APPEND = (1 << 8) * ENABLE_FEATURE_DD_IBS_OBS,
/* end of output flags */
- FLAG_TWOBUFS = (1 << 8) * ENABLE_FEATURE_DD_IBS_OBS,
- FLAG_COUNT = 1 << 9,
- FLAG_STATUS_NONE = 1 << 10,
- FLAG_STATUS_NOXFER = 1 << 11,
+ FLAG_TWOBUFS = (1 << 9) * ENABLE_FEATURE_DD_IBS_OBS,
+ FLAG_COUNT = 1 << 10,
+ FLAG_STATUS_NONE = 1 << 11,
+ FLAG_STATUS_NOXFER = 1 << 12,
};
static void dd_output_status(int UNUSED_PARAM cur_signal)
@@ -267,7 +269,7 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
static const char iflag_words[] ALIGN1 =
"skip_bytes\0""fullblock\0";
static const char oflag_words[] ALIGN1 =
- "seek_bytes\0";
+ "seek_bytes\0append\0";
#endif
#if ENABLE_FEATURE_DD_STATUS
static const char status_words[] ALIGN1 =
@@ -451,6 +453,8 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
if (!seek && !(G.flags & FLAG_NOTRUNC))
oflag |= O_TRUNC;
+ if (G.flags & FLAG_APPEND)
+ oflag |= O_APPEND;
xmove_fd(xopen(outfile, oflag), ofd);
diff --git a/docs/posix_conformance.txt b/docs/posix_conformance.txt
index 0e6f4a317..f6e8858cc 100644
--- a/docs/posix_conformance.txt
+++ b/docs/posix_conformance.txt
@@ -183,6 +183,7 @@ dd compatibility options:
iflag=skip_bytes| yes | |
iflag=fullblock | yes | |
oflag=seek_bytes| yes | |
+ oflag=append | yes | |
df POSIX options
option | exists | compliant | remarks