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1 files changed, 38 insertions, 12 deletions

diff --git a/src/screen.c b/src/screen.c
index b98a26a..252d39d 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -25,14 +25,17 @@ void scr_waitvcount(u8 c) {
 }
 
 static void scr_clear(char s) {
-	memset(screen_addrs[s], 0, SCREEN_SIZE);
+	memset(screen_top_addrs[s], 0, 1000);
+	memset(screen_bot_addrs[s], 0, 1000);
 	memset(scr_names[s], 0, 32);
 	memset(scr_topics[s], 0, LINE_SIZE);
 }
 
 static void scr_scroll(char s) {
-	memmove(screen_addrs[s], screen_addrs[s] + 40, 880);
-	memset(screen_botlines[s], 0, 40);
+	memmove(screen_top_addrs[s], screen_top_addrs[s] + 40, 960);
+	memmove(screen_top_addrs[s] + 960, screen_bot_addrs[s], 40);
+	memmove(screen_bot_addrs[s], screen_bot_addrs[s] + 40, 920);
+	memset(screen_lastlines[s], 0, 40);
 }
 
 void scr_init(void) {
@@ -41,7 +44,7 @@ void scr_init(void) {
 	old_dma = OS.sdmctl;
 	OS.sdmctl = 0;
 	scr_waitvcount(112); /* after the last GR.0 line */
-	*SDLST = DLIST_ADDR;
+	*SDLST = DLIST_BOT_ADDR;
 	OS.chbas = FONT_ADDR_HI;
 
 	for(i = 0; i < MAX_SCREENS; i++) {
@@ -106,21 +109,36 @@ void scr_display(char s) {
 	scr_current = s;
 
 	scr_waitvcount(112);
-	*dlist_top_lms = (u16)screen_addrs[s];
+	*dlist_bot_lms = (u16)screen_bot_addrs[s];
 
 	scr_show_status(s);
 }
 
+void scr_scrollback(void) {
+	// OS.color2 = 0;
+	scr_waitvcount(112);
+	*dlist_top_lms = (u16)screen_top_addrs[scr_current];
+	*SDLST = (u16)dlist_top;
+}
+
+void scr_end_scrollback(void) {
+	// OS.color2 = 192;
+	scr_waitvcount(112);
+	*SDLST = (u16)dlist_bot;
+}
+
 void scr_show_status(char s) {
 	int i;
 	char *p, sc;
 
-	status_box[0] = s + 177; /* inverse number */
-	status_box[1] = ':';
-	strncpy(status_box + 2, scr_names[s], 32);
-	strncpy(status_box + 40, scr_topics[s], 40);
+	/* this part should be moved to _create() */
+	p = status_boxes[s];
+	p[0] = s + 177; /* inverse number */
+	p[1] = ':';
+	strncpy(p + 2, scr_names[s], 32);
+	strncpy(p + 40, scr_topics[s], 40);
 
-	p = status_box + 33;
+	p += 33;
 	for(i = 0; i < MAX_SCREENS; i++) {
 		switch(scr_status[i]) {
 			case SCR_ACTIVE:
@@ -134,7 +152,7 @@ void scr_show_status(char s) {
 	}
 
 	scr_waitvcount(112);
-	*dlist_bottom_lms = (u16)status_box;
+	*dlist_status_lms = (u16)status_boxes[s];
 }
 
 void scr_refresh(void) {
@@ -152,6 +170,14 @@ char scr_getbyname(const char *name) {
 	return 0;
 }
 
+void scr_putc_active(char c) {
+	scr_putc(scr_active, c);
+}
+
+void scr_eol_active(void) {
+	scr_putc(scr_active, '\n');
+}
+
 /* TODO: skip color codes (start with 0x03 or 0x04).
    if we're going to ever support utf-8, decode it here...
    also, 0x16 is supposed to be reverse video. not widely used/supported.
@@ -176,7 +202,7 @@ void scr_putc(char s, char c) {
 		xpos = 0;
 	}
 
-	dest = screen_botlines[s] + xpos;
+	dest = screen_lastlines[s] + xpos;
 
 	if(c & 0x80) {
 		/* utf-8 (or maybe latin-1), we don't support it yet */