From d4fa36ec446e758a7c167cb2e9c7ce6a69678853 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Haoran=20S=2E=20Diao=20=28=E5=88=81=E6=B5=A9=E7=84=B6=29?=
 <0@hairydiode.xyz>
Date: Fri, 12 Sep 2025 22:59:16 -0700
Subject: Added scroll region restriction

---
 im.h    | 12 ++++++++++++
 ptyim.c |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/im.h b/im.h
index 47ae538..b08b74a 100644
--- a/im.h
+++ b/im.h
@@ -212,6 +212,14 @@ void im_preview(int fd, int trows, int tcols) {
 	//writes the preview
 	write(fd,preview_buffer,strlen(preview_buffer));
 }
+void restrict_scroll(int fd, int trows, int tcols) {
+	char pos_str[32] = "";
+	int l = snprintf(pos_str, 32, "\033[0;%dr", trows-1);
+	write(fd, pos_str,l);
+}
+void unrestrict_scroll(int fd) {
+	write(fd,"\033[0;0r", 6);
+}
 //Displays the IM on the bottom line, input is the number of actual physical
 //rows and columns on the terminal descibed by fd
 void disp_im(int fd, int trows, int tcols) {
@@ -225,6 +233,7 @@ void disp_im(int fd, int trows, int tcols) {
 	int l = snprintf(pos_str, 32, "\033[%d;%df", trows, im_col);
 
 	write(fd,"\0337",2); //saves previous cursor position
+	unrestrict_scroll(fd); //unrestricts the scrolling region
 	write(fd, pos_str,l);
 	write(fd,"\033[7m",4); //invert video
 
@@ -249,6 +258,9 @@ void disp_im(int fd, int trows, int tcols) {
 	if (IM_PREVIEW) {
 		im_preview(fd, trows, tcols);
 	}
+	//restricts scroll region again
+	restrict_scroll(fd, trows, tcols);
+	//resets scroll region
 	//restore cursor pos and attrbutes
 	write(fd,"\033[0m",4);
 	write(fd,"\0338",2);
diff --git a/ptyim.c b/ptyim.c
index eedffd3..f6434c8 100644
--- a/ptyim.c
+++ b/ptyim.c
@@ -95,6 +95,8 @@ void exit_main() {
 	restore_stdin();
 	//clears the screen so the im statusline goes away
 	write(STDIN_FILENO,"\033[2J", 4);
+	//resets scroll region
+	unrestrict_scroll(STDIN_FILENO);
 	_exit(0);
 }
 //hook for when the pty child process dies
-- 
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