2 files changed, 208 insertions, 0 deletions
diff --git a/src/kernel/ui/vt.cpp b/src/kernel/ui/vt.cpp
new file mode 100644
index 0000000..4675cdc
--- /dev/null
+++ b/src/kernel/ui/vt.cpp
@@ -0,0 +1,159 @@
+#include "vt.h"
+#include <dev/display.h>
+
+vt *ke_vt = 0;
+
+vt::vt(node* parent, int ww, int hh) : node(parent, FT_TERMINAL) {
+	w = ww; h = hh;
+	fgcolor = TC_LIGHTGRAY;
+	bgcolor = TC_BLACK;
+	output = 0;
+	cursor_visible = true;
+	
+	text = 0;
+	if (w != 0 && h != 0) {
+		text = (vt_char*)kmalloc(w * h * sizeof(vt_char));
+		clear();
+	}
+}
+
+void vt::put_at(int l, int c, int ch) {
+	text[l * w + c].fgcolor = fgcolor;
+	text[l * w + c].bgcolor = bgcolor;
+	text[l * w + c].ch = ch;
+	if (output != 0) output->text_put(l, c, ch, fgcolor, bgcolor);
+}
+
+void vt::put(int c) {
+	if (text == 0) return;
+
+	if (c == '\b' && csr_c != 0) {
+		csr_c--;
+		put_at(csr_l, csr_c, ' ');
+	} else if (c == '\t') {
+		int csr_nc = (csr_c + 8) & ~(8 - 1);
+		for (int i = csr_c; i < csr_nc && i < w; i++) put_at(csr_l, i, ' ');
+		csr_c = csr_nc;
+	} else if (c == '\r') {
+		csr_c = 0;
+	} else if (c == '\n') {
+		csr_c = 0;
+		csr_l++;
+	} else if (c >= ' ') {
+		put_at(csr_l, csr_c, c);
+		csr_c++;
+	}
+	if (csr_c >= w) {
+		csr_c = 0;
+		csr_l++;
+	}
+	if (csr_l == h) {
+		if (output != 0 && output->connected_vt == this) {
+			output->text_scroll(1, fgcolor, bgcolor);
+		}
+		for (int j = 0; j < w * (h-1); j++) {
+			text[j] = text[j + w];
+		}
+		for (int j = w * (h-1); j < w * h; j++) {
+			text[j].fgcolor = fgcolor;
+			text[j].bgcolor = bgcolor;
+			text[j].ch = ' ';
+		}
+		csr_l--;
+	}
+	if (output != 0 && output->connected_vt == this) output->text_setcsr(csr_l, csr_c, cursor_visible);
+}
+
+void vt::clear() {
+	for (int i = 0; i < w; i++) {
+		for (int j = 0; j < h; j++) {
+			put_at(j, i, ' ');
+		}
+	}
+	csr_c = csr_l = 0;
+}
+
+void vt::writeStr(char *s) {
+	while (*s) {
+		put(*(s++));
+	}
+}
+
+void vt::writeHex(uint32_t v) {
+	int i;
+
+	put('0'); put('x');
+	char hexdigits[] = "0123456789abcdef";
+
+	for (i = 0; i < 8; i++) {
+		put(hexdigits[v >> 28]);
+		v = v << 4;
+	}
+}
+
+void vt::writeDec(uint32_t v) {
+	if (v == 0) {
+		put('0');
+		return;
+	}
+
+	char numbers[] = "0123456789";
+	while (v > 0) {
+		int order = 1, no = 1;
+		while (v / order > 0) order *= 10;
+		order /= 10;
+		put(numbers[v / order]);
+		v = v - (v / order * order);
+		while (v / no > 0) no *= 10;
+		while (no < order) {
+			put('0');
+			no *= 10;
+		}
+	}
+}
+
+// *******
+
+int vt::outputTo(display *display) {
+	output = display;
+	if (output == 0) return 0;
+	output->connected_vt = this;
+	
+	if (output->text_w() != w || output->text_h() != h) {
+		int ow = w, oh = h;
+		vt_char *old_text = text;
+
+		w = output->text_w();
+		h = output->text_h();
+		text = (vt_char*)malloc(w * h * sizeof(vt_char));
+		for (int c = 0; c < w; c++) {
+			for (int l = 0; l < h; l++) {
+				if (c < ow && l < oh) {
+					put_at(l, c, old_text[l * ow + c].ch);
+				} else {
+					put_at(l, c, ' ');
+				}
+			}
+		}
+		if (old_text != 0) free(old_text);
+		if (csr_c >= w) csr_c = w;
+		if (csr_l >= h) csr_l = h;
+	} else {
+		for (int c = 0; c < w; c++) {
+			for (int l = 0; l < h; l++) {
+				output->text_put(l, c, text[l*w+c].ch, text[l*w+c].fgcolor, text[l*w+c].bgcolor);
+			}
+		}
+	}
+	return 0;
+}
+
+int vt::write(size_t offset, size_t len, char* buffer) {
+	// ignore offset
+	for (unsigned i = 0; i < len; i++) put(buffer[i]);
+	return len;
+}
+
+size_t vt::get_size() {
+	return ((w << 16) + h);
+}
diff --git a/src/kernel/ui/vt.h b/src/kernel/ui/vt.h
new file mode 100644
index 0000000..b4f3672
--- /dev/null
+++ b/src/kernel/ui/vt.h
@@ -0,0 +1,49 @@
+#ifndef DEF_UI_VT_H
+#define DEF_UI_VT_H
+
+#include <vfs/node.h>
+#include <dev/display.h>
+
+struct vt_char {
+	int ch;
+	uint8_t fgcolor, bgcolor;
+};
+
+class vt : public node {
+	private:
+	display *output;
+	int w, h, csr_l, csr_c;
+	vt_char *text;
+
+	void put_at(int l, int c, int ch);
+	bool cursor_visible;
+
+	public:
+	uint8_t fgcolor, bgcolor;
+
+	vt(node* parent, int w, int h);
+
+	// internal use
+	void put(int c);
+	void clear();
+	void writeStr(char* str);
+	void writeHex(uint32_t v);
+	void writeDec(uint32_t v);
+
+	int outputTo(display *display);
+
+	virtual int write(size_t offset, size_t len, char* buffer);
+	virtual size_t get_size();
+};
+
+extern vt *ke_vt;
+#define NL ke_vt->writeStr("\n");
+#define TAB ke_vt->writeStr("\t");
+#define WHERE { ke_vt->writeStr("(ke:");	\
+				ke_vt->writeStr(__FILE__);	\
+				ke_vt->writeStr(":");		\
+				ke_vt->writeDec(__LINE__);	\
+				ke_vt->writeStr(")  "); }
+
+#endif
+