From: Alan Cox <alan@linux.intel.com>
Date: Wed, 10 Jun 2015 22:22:35 +0000 (+0100)
Subject: vt: add bits for attribute setting/reporting
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=f57a87ec8089e7803206af2b159b4eef35cae26b;p=FUZIX.git

vt: add bits for attribute setting/reporting

Done with a single escape code to make the parsing tiny. It's then up to the
platform what if anything to offer, but if nothing is supported then the
platform needs the vtattr_cap byte defining.
---

diff --git a/Kernel/include/tty.h b/Kernel/include/tty.h
index 2218fe8b..1ca66620 100644
--- a/Kernel/include/tty.h
+++ b/Kernel/include/tty.h
@@ -143,6 +143,7 @@ struct termios {
 #define KBMAPGET	0x21
 #define VTSIZE		0x22
 #define KBSETTRANS	0x23
+#define VTATTRS		0x24
 
 /* Character Input Queue size */
 #define TTYSIZ 132
diff --git a/Kernel/include/vt.h b/Kernel/include/vt.h
index ed87d166..9509a735 100644
--- a/Kernel/include/vt.h
+++ b/Kernel/include/vt.h
@@ -19,6 +19,15 @@
 
 struct vt_switch {
   uint8_t vtmode;
+  uint8_t vtattr;
+#define VTA_INVERSE	1
+#define VTA_UNDERLINE	2
+#define VTA_ITALIC	4
+#define VTA_FLASH	8
+#define VTA_BOLD	16
+#define VTA_OVERSTRIKE	32
+  /* 64 is set to ensure a valid normal character */
+#define VTA_NOCURSOR	128
   signed char cursorx;
   signed char cursory;
   signed char ncursory;
@@ -41,5 +50,6 @@ void plot_char(int8_t y, int8_t x, uint16_t c);
 void do_beep(void);
 int vt_ioctl(uint8_t minor, uarg_t op, char *ptr);
 int vt_inproc(uint8_t minor, unsigned char c);
+extern uint8_t vtattr_cap;
 
-#endif
\ No newline at end of file
+#endif
diff --git a/Kernel/vt.c b/Kernel/vt.c
index 1329df0f..2c6eb0b2 100644
--- a/Kernel/vt.c
+++ b/Kernel/vt.c
@@ -39,11 +39,24 @@
  *	This code can be banked on its own. If you touch it on Z80 make
  *	very sure you inspect the asm output for calls to compiler helpers
  *	and don't add any.
- *	
+ *
+ *	Possible VT extensions to look at
+ *	- Esc-L		Insert blank line, move lines below down
+ *	- ESC-M		Delete cursor line, move up blank bottom
+ *	-		Colour setting (Atari ST uses esc b/c) but we need
+ *			more flexibility and border
+ *	- ESC-d		erase start to cursor inclusive
+ *	- ESC-j		save cursor y/x
+ *	- ESC-k		restore cursor
+ *	- ESC-l		erase line, cursor to left
+ *	- ESC-o		erase from start of line to cursor (inclusive)
+ *
+ *	Would tty be a better graphics interface than direct ? Probably not ?
  */
 
 
 static uint8_t vtmode;
+uint8_t vtattr;
 static signed char cursorx;
 static signed char cursory = VT_INITIAL_LINE;
 static signed char ncursory;
@@ -153,7 +166,8 @@ static int escout(unsigned char c)
 	}
 	if (c == 'Y')
 		return 2;
-
+	if (c == 'a')
+		return 4;
 	return 0;
 }
 
@@ -176,13 +190,17 @@ void vtoutput(unsigned char *p, unsigned int len)
 			ncursory = c - ' ';
 			vtmode++;
 			continue;
-		} else {
+		} else if (vtmode == 3) {
 			int ncursorx = c - ' ';
 			if (ncursory >= 0 && ncursorx <= VT_BOTTOM)
 				cursory = ncursory;
 			if (ncursorx >= 0 && ncursorx <= VT_RIGHT)
 				cursorx = ncursorx;
 			vtmode = 0;
+		} else {
+			vtattr = c;
+			vtmode = 0;
+			continue;
 		}
 	}
 	cursor_on(cursory, cursorx);
@@ -210,6 +228,8 @@ int vt_ioctl(uint8_t minor, uarg_t request, char *data)
 #endif					
 			case VTSIZE:
 				return VT_HEIGHT << 8 | VT_WIDTH;
+			case VTATTRS:
+				return vtattr_cap;
 		}
 	}
 	return tty_ioctl(minor, request, data);
@@ -259,6 +279,7 @@ void vtinit(void)
 void vt_save(struct vt_switch *vt)
 {
 	vt->vtmode = vtmode;
+	vt->vtattr = vtattr;
 	vt->cursorx = cursorx;
 	vt->cursory = cursory;
 	vt->ncursory = ncursory;
@@ -267,6 +288,7 @@ void vt_save(struct vt_switch *vt)
 void vt_load(struct vt_switch *vt)
 {
 	vtmode = vt->vtmode;
+	vtattr = vt->vtattr;
 	cursorx = vt->cursorx;
 	cursory = vt->cursory;
 	ncursory = vt->ncursory;