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	dd: implement conv=notrunc support - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	commit e0dc3f9546b3cd839aef8e58376c6295679a5ed5
	parent 596663c1b1f140c10ba1facede783201d6a876a7
	Author: Eivind Uggedal <[email protected]>
	Date: Wed, 16 Mar 2016 09:23:50 +0000

	dd: implement conv=notrunc support

	Diffstat:
	M dd.1 \| 2 ++
	M dd.c \| 11 +++++++----

	2 files changed, 9 insertions(+), 4 deletions(-)
	---
	diff --git a/dd.1 b/dd.1
	@@ -61,4 +61,6 @@ blocks from the beginning of the output before copying.
	Skip
	.Ar N
	blocks from the beginning of the input before copying.
	+.It Ar conv=notrunc
	+Do not truncate the output file.
	.El
	diff --git a/dd.c b/dd.c
	@@ -32,7 +32,7 @@ struct dd_config {
	uint64_t skip, seek, count, b_in, b_out, rec_in, rec_out;
	off_t fsize;
	blksize_t bs;
	- char quiet, nosync, direct;
	+ char quiet, nosync, notrunc, direct;
	time_t t_start, t_end;
	};

	@@ -99,7 +99,7 @@ prepare_copy(struct dd_config ddc, int ifd, int *ofd)
	return -1;
	}

	- if (!ddc->seek)
	+ if (!ddc->seek && !ddc->notrunc)
	flo \|= O_TRUNC;

	if (!ddc->out) *ofd = 1;
	@@ -108,7 +108,7 @@ prepare_copy(struct dd_config ddc, int ifd, int *ofd)
	return -1;
	}

	- if (ddc->seek) {
	+ if (ddc->seek && !ddc->notrunc) {
	if (fstat(*ofd, &st) < 0)
	return -1;
	if (!S_ISREG(st.st_mode))
	@@ -238,7 +238,8 @@ static void
	usage(void)
	{
	eprintf("usage: %s [-h] [if=infile] [of=outfile] [bs[=N]] [seek=N] "
	- "[skip=N] [count=N] [direct] [quiet] [nosync]\n", argv0);
	+ "[skip=N] [count=N] [direct] [quiet] [nosync]"
	+ "[conv=notrunc]\n", argv0);
	}

	int
	@@ -278,6 +279,8 @@ main(int argc, char *argv[])
	config.quiet = 1;
	else if (strcmp(argv[i], "nosync") == 0)
	config.nosync = 1;
	+ else if (strcmp(argv[i], "conv=notrunc") == 0)
	+ config.notrunc = 1;
	else if (strcmp(argv[i], "-h") == 0)
	usage();
	}