dd: add 'oflag=append'
Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 4b31e9a..2fb9da7 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 @@
/* 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 @@
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 @@
if (!seek && !(G.flags & FLAG_NOTRUNC))
oflag |= O_TRUNC;
+ if (G.flags & FLAG_APPEND)
+ oflag |= O_APPEND;
xmove_fd(xopen(outfile, oflag), ofd);