1 files changed, 47 insertions, 0 deletions
diff --git a/src/blind-split-cols.c b/src/blind-split-cols.c
new file mode 100644
index 0000000..e8b4185
--- /dev/null
+++ b/src/blind-split-cols.c
@@ -0,0 +1,47 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+USAGE("(file columns) ...")
+
+int
+main(int argc, char *argv[])
+{
+	struct stream stream;
+	size_t *cols, period = 0, parts, i;
+	int *fds;
+
+	UNOFLAGS(argc % 2 || !argc);
+
+	eopen_stream(&stream, NULL);
+
+	parts = (size_t)argc / 2;
+	cols  = alloca(parts * sizeof(*cols));
+	fds   = alloca(parts * sizeof(*fds));
+
+	for (i = 0; i < parts; i++) {
+		fds[i] = eopen(argv[i * 2], O_WRONLY | O_CREAT | O_TRUNC, 0666);
+		cols[i] = etozu_arg("columns", argv[i * 2 + 1], 1, SIZE_MAX);
+	}
+	for (i = 0; i < parts; i++) {
+		if (cols[i] > SIZE_MAX - period)
+			goto bad_col_count;
+		period += cols[i];
+	}
+	if (period != stream.width)
+		goto bad_col_count;
+
+	for (i = 0; i < parts; i++)
+		if (DPRINTF_HEAD(fds[i], stream.frames, cols[i], stream.height, stream.pixfmt) < 0)
+			eprintf("dprintf %s:", argv[i * 2]);
+	for (i = 0; i < parts; i++, i = i == parts ? 0 : i)
+		if (esend_pixels(&stream, fds[i], cols[i], argv[i * 2]) != cols[i])
+			break;
+	for (i = 0; i < parts; i++)
+		close(fds[i]);
+
+	return 0;
+
+bad_col_count:
+	eprintf("the sum of all columns must add up to the width of the input video\n");
+	return 1;
+}