+#if 0
+#include "con.h"
+
+
+
+#define NCOLS 80
+#define NROWS 25
+
+/* must be pow2 */
+#define TEXTBUF_SIZE 256
+
+static char textbuf[TEXTBUF_SIZE][NCOLS];
+static int tbuf_first, tbuf_last;
+
+static int curx, cury, scroll;
+
+#define CURSTACK_SIZE 16
+static unsigned int savecur[CURSTACK_SIZE];
+static int savecur_top;
+
+
+static void newline(void);
+
+
+void con_init(void)
+{
+ con_reset();
+}
+
+void con_reset(void)
+{
+ vga_reset();
+
+ curx = cury = scroll = 0;
+ tbuf_first = tbuf_last = 0;
+ memset(textbuf[0], 0, sizeof textbuf[0]);
+
+ savecur_top = 0;
+}
+
+void con_setcur(int x, int y)
+{
+ curx = x < 0 ? 0 : (x >= NCOLS ? NCOLS - 1 : x);
+ cury = y < 0 ? 0 : (y >= NROWS ? NROWS - 1 : y);
+}
+
+void con_getcur(int *x, int *y)
+{
+ *x = curx;
+ *y = cury;
+}
+
+void con_pushcur(void)
+{
+ if(savecur_top >= CURSTACK_SIZE) return;
+
+ savecur[savecur_top++] = curx | (cury << 16);
+}
+
+void con_popcur(void)
+{
+ if(savecur_top <= 0) return;
+
+ savecur_top--;
+ curx = savecur[savecur_top] & 0xffff;
+ cury = savecur[savecur_top] >> 16;
+}
+
+void con_putchar(int c)
+{
+ switch(c) {
+ case '\t':
+ curx = (curx + 8) & 0xfffffff8;
+ if(curx >= NCOLS) {
+ newline();
+ }
+ break;
+
+ case '\r':
+ curx = 0;
+ break;
+
+ case '\n':
+ newline();
+ break;
+
+ case '\b':
+ if(curx > 0) {
+ textbuf[tbuf_last][--curx] = 0;
+ vga_drawchar(curx, cury, 0);
+ }
+ break;
+
+ default:
+ textbuf[tbuf_last][curx] = c;
+ vga_drawchar(curx, cury, c);
+ if(++curx >= NCOLS) {
+ newline();
+ }
+ break;
+ }
+
+ if(cury >= NROWS) {
+ cury--;
+ vga_scroll(++scroll);
+ vga_clearline(NROWS - 1);
+ }
+
+ vid_set_cursor(curx, cury);
+}
+
+static void newline(void)
+{
+ int num;
+
+ curx = 0;
+ cury++;
+
+ num = (tbuf_last + 1) & (TEXTBUF_SIZE - 1);
+
+ if(tbuf_last == tbuf_first) {
+ tbuf_first = num;
+ }
+ tbuf_last = num;
+}
+#endif