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	Add support for DSR response "OK" escape sequence - st - simple terminal
	git clone git://git.suckless.org/st
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	commit f17abd25b376c292f783062ecf821453eaa9cc4c
	parent 7e8050cc621f27002eaf1be8114dee2497beff91
	Author: Adam Price <[email protected]>
	Date: Tue, 7 Feb 2023 19:54:29 +0100

	Add support for DSR response "OK" escape sequence

	"VT100 defines an escape sequence [1] called Device Status Report (DSR). When
	the DSR sequence received is `csi 5n`, an "OK" response `csi 0n` is returned.
	This patch adds that "OK" response.

	I encountered this missing sequence when I noticed that fzf [2] would clobber
	my prompt whenever completing a find.

	To test that ST doesn't currently respond to `csi 5n`, use fzf's shell
	extension in ST's repo to complete the path for a file.

	my-fancy-prompt $ vim **<tab>
	<select a file>
	st.c

	Select a file with <enter>, and notice that fzf clobbers some or all of your
	prompt.

	After applying this patch, do the same test as above and notice that fzf has no
	longer clobbered your prompt by placing the file name in the correct position
	in your command.

	my-fancy-prompt $ vim **<tab>
	<select a file>
	my-fancy prompt $ vim st.c

	Thank you for considering my first patch submission.

	[1] https://www.xfree86.org/current/ctlseqs.html#VT100%20Mode
	[2] https://github.com/junegunn/fzf
	"

	Patch slightly adapted with input from the mailinglist,

	Diffstat:
	M st.c \| 13 ++++++++++---

	1 file changed, 10 insertions(+), 3 deletions(-)
	---
	diff --git a/st.c b/st.c
	@@ -1769,11 +1769,18 @@ csihandle(void)
	case 'm': /* SGR -- Terminal attribute (color) */
	tsetattr(csiescseq.arg, csiescseq.narg);
	break;
	- case 'n': /* DSR – Device Status Report (cursor position) */
	- if (csiescseq.arg[0] == 6) {
	+ case 'n': /* DSR -- Device Status Report */
	+ switch (csiescseq.arg[0]) {
	+ case 5: /* Status Report "OK" `0n` */
	+ ttywrite("\033[0n", sizeof("\033[0n") - 1, 0);
	+ break;
	+ case 6: /* Report Cursor Position (CPR) "<row>;<column>R" */
	len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
	- term.c.y+1, term.c.x+1);
	+ term.c.y+1, term.c.x+1);
	ttywrite(buf, len, 0);
	+ break;
	+ default:
	+ goto unknown;
	}
	break;
	case 'r': /* DECSTBM -- Set Scrolling Region */