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	blind-split-chan: add -c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	LICENSE
	---
	commit f70ffc7f6e6331a56be4a52882c432133e40bd01
	parent 509cd22048a070317e43a53c5c733f61d01e20a4
	Author: Mattias Andrée <[email protected]>
	Date: Fri, 21 Jul 2017 17:15:09 +0200

	blind-split-chan: add -c

	Signed-off-by: Mattias Andrée <[email protected]>

	Diffstat:
	M man/blind-split-chans.1 \| 10 ++++++++++
	M src/blind-split-chans.c \| 52 +++++++++++++++++++++++------…

	2 files changed, 49 insertions(+), 13 deletions(-)
	---
	diff --git a/man/blind-split-chans.1 b/man/blind-split-chans.1
	@@ -3,6 +3,7 @@
	blind-split-chans - Split colour channels into separate videos
	.SH SYNOPSIS
	.B blind-split-chans
	+[-c]
	.I X-file
	.I Y-file
	.I Z-file
	@@ -37,6 +38,15 @@ in
	.IR Y-file ,
	and
	.IR Z-file .
	+.SH OPTIONS
	+.TP
	+.B -c
	+Set the values to zero in all channels
	+except for channels matching their file. If
	+.I alpha-file
	+is omitted, the alpha values are still
	+stored in the alpha channel of the other
	+files.
	.SH SEE ALSO
	.BR blind (7),
	.BR blind-arithm (1),
	diff --git a/src/blind-split-chans.c b/src/blind-split-chans.c
	@@ -1,17 +1,27 @@
	/* See LICENSE file for copyright and license details. */
	#include "common.h"

	-USAGE("X-file Y-file Z-file [alpha-file]")
	+USAGE("[-c] X-file Y-file Z-file [alpha-file]")

	int
	main(int argc, char *argv[])
	{
	struct stream stream;
	- char xbuf[BUFSIZ], ybuf[BUFSIZ], zbuf[BUFSIZ], abuf[BUFSIZ];
	+ char xbuf[sizeof(stream.buf)], ybuf[sizeof(xbuf)], zbuf[sizeof(xbuf)],…
	int xfd, yfd, zfd, afd = -1;
	- size_t i, n, ptr;
	+ size_t i, n, ptr, cs;
	+ int all_channels = 1;

	- UNOFLAGS(argc != 3 && argc != 4);
	+ ARGBEGIN {
	+ case 'c':
	+ all_channels = 0;
	+ break;
	+ default:
	+ usage();
	+ } ARGEND;
	+
	+ if (argc != 3 && argc != 4)
	+ usage();

	eopen_stream(&stream, NULL);

	@@ -30,20 +40,36 @@ main(int argc, char *argv[])
	if (afd >= 0 && DPRINTF_HEAD(afd, stream.frames, stream.width, stream.…
	eprintf("dprintf %s:", argv[3]);

	- n = (stream.n_chan - (afd < 0)) * stream.chan_size;
	+ if (!all_channels) {
	+ memset(xbuf, 0, sizeof(xbuf));
	+ memset(ybuf, 0, sizeof(ybuf));
	+ memset(zbuf, 0, sizeof(zbuf));
	+ memset(abuf, 0, sizeof(abuf));
	+ }
	+
	+ cs = stream.chan_size;
	+ n = (stream.n_chan - (afd < 0)) * cs;
	do {
	for (ptr = 0; ptr + stream.pixel_size <= stream.ptr; ptr += st…
	- for (i = 0; i < n; i += stream.chan_size) {
	- memcpy(xbuf + ptr + i, stream.buf + ptr + 0 * …
	- memcpy(ybuf + ptr + i, stream.buf + ptr + 1 * …
	- memcpy(zbuf + ptr + i, stream.buf + ptr + 2 * …
	+ if (all_channels) {
	+ for (i = 0; i < n; i += cs) {
	+ memcpy(xbuf + ptr + i, stream.buf + pt…
	+ memcpy(ybuf + ptr + i, stream.buf + pt…
	+ memcpy(zbuf + ptr + i, stream.buf + pt…
	+ if (afd >= 0)
	+ memcpy(abuf + ptr + i, stream.…
	+ }
	+ } else {
	+ memcpy(xbuf + ptr + 0 * cs, stream.buf + ptr +…
	+ memcpy(ybuf + ptr + 1 * cs, stream.buf + ptr +…
	+ memcpy(zbuf + ptr + 2 * cs, stream.buf + ptr +…
	if (afd >= 0)
	- memcpy(abuf + ptr + i, stream.buf + pt…
	+ memcpy(abuf + ptr + 3 * cs, stream.buf…
	}
	if (afd < 0) {
	- memcpy(xbuf + ptr + n, stream.buf + ptr + 3 * …
	- memcpy(ybuf + ptr + n, stream.buf + ptr + 3 * …
	- memcpy(zbuf + ptr + n, stream.buf + ptr + 3 * …
	+ memcpy(xbuf + ptr + n, stream.buf + ptr + 3 * …
	+ memcpy(ybuf + ptr + n, stream.buf + ptr + 3 * …
	+ memcpy(zbuf + ptr + n, stream.buf + ptr + 3 * …
	}
	}
	ewriteall(xfd, xbuf, ptr, argv[0]);