scroll

commit 2a98acd428a2a330416a37bd68e2218042d3d013
parent c74dc9e7463ccac3a8a9d49737637419a1ab3ac6
Author: Jan Klemkow <j.klemkow@wemelug.de>
Date:   Wed,  1 Apr 2020 22:11:39 +0200

add some comments

Diffstat:
M
scroll.c
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/scroll.c b/scroll.c
@@ -182,7 +182,7 @@ strelen(const char *buf, size_t size)
 	return len;
 }
 
-/* alternate screen */
+/* detect alternative screen switching */
 bool
 isaltscreen(char c)
 {
@@ -213,11 +213,13 @@ isaltscreen(char c)
 			buf[i] = '\0';
 			i = 0;
 
+			/* esc seq. enable alternative screen */
 			if (strcmp(buf, "?1049h") == 0 ||
 			    strcmp(buf, "?1047h") == 0 ||
 			    strcmp(buf, "?47h"  ) == 0)
 				alt = true;
 
+			/* esc seq. disable alternative screen */
 			if (strcmp(buf, "?1049l") == 0 ||
 			    strcmp(buf, "?1047l") == 0 ||
 			    strcmp(buf, "?47l"  ) == 0)
@@ -292,7 +294,7 @@ scrolldown(char *buf, size_t size)
 		write(STDOUT_FILENO, bottom->buf, bottom->size);
 	}
 	if (rows < ws.ws_row && bottom == TAILQ_FIRST(&head)) {
-		write(STDOUT_FILENO, "\033[?25h", 6);
+		write(STDOUT_FILENO, "\033[?25h", 6);	/* show cursor */
 		write(STDOUT_FILENO, buf, size);
 	}
 }