Adding scrollback patch

patch/scrollback.c

@@ -0,0 +1,38 @@
+void
+kscrolldown(const Arg* a)
+{
+	int n = a->i;
+
+	if (n < 0)
+		n = term.row + n;
+
+	if (n > term.scr)
+		n = term.scr;
+
+	if (term.scr > 0) {
+		term.scr -= n;
+		selscroll(0, -n);
+		tfulldirt();
+	}
+}
+
+void
+kscrollup(const Arg* a)
+{
+	int n = a->i;
+	if (n < 0)
+		n = term.row + n;
+
+	if (term.scr <= HISTSIZE-n) {
+		term.scr += n;
+		selscroll(0, n);
+		tfulldirt();
+	}
+}
+
+#if SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+int tisaltscr(void)
+{
+	return IS_SET(MODE_ALTSCREEN);
+}
+#endif // SCROLLBACK_MOUSE_ALTSCREEN_PATCH

patch/scrollback.h

@@ -0,0 +1,21 @@
+#define TLINE(y) ((y) < term.scr ? term.hist[((y) + term.histi - \
+                     term.scr + HISTSIZE + 1) % HISTSIZE] : \
+                     term.line[(y) - term.scr])
+
+void kscrolldown(const Arg *);
+void kscrollup(const Arg *);
+
+#if SCROLLBACK_MOUSE_PATCH || SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+typedef struct {
+	 uint b;
+	 uint mask;
+	 void (*func)(const Arg *);
+	 const Arg arg;
+} MouseKey;
+
+extern MouseKey mkeys[];
+#endif // SCROLLBACK_MOUSE_PATCH / SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+
+#if SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+int tisaltscr(void);
+#endif // SCROLLBACK_MOUSE_ALTSCREEN_PATCH

patch/st_include.c

@@ -6,4 +6,8 @@
 
 #if NEWTERM_PATCH
 #include "newterm.c"
+#endif
+
+#if SCROLLBACK_PATCH || SCROLLBACK_MOUSE_PATCH || SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+#include "scrollback.c"
 #endif

patch/st_include.h

@@ -10,4 +10,8 @@ void xximspot(int, int);
 
 #if NEWTERM_PATCH
 #include "newterm.h"
+#endif
+
+#if SCROLLBACK_PATCH || SCROLLBACK_MOUSE_PATCH || SCROLLBACK_MOUSE_ALTSCREEN_PATCH
+#include "scrollback.h"
 #endif