Rewrite terminal emulator

1 files changed, 81 insertions, 0 deletions

diff --git a/term.h b/term.h
new file mode 100644
index 0000000..03d9ac5
--- /dev/null
+++ b/term.h
@@ -0,0 +1,81 @@
+/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdbool.h>
+#include <wchar.h>
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+typedef unsigned uint;
+
+enum {
+	NUL, SOH, STX, ETX, EOT, ENQ, ACK, BEL,
+	BS, HT, NL, VT, NP, CR, SO, SI,
+	DLE, DC1, DC2, DC3, DC4, NAK, SYN, ETB,
+	CAN, EM, SUB, ESC, FS, GS, RS, US,
+	DEL = 0x7F,
+};
+
+enum Attr {
+	Bold      = 1 << 0,
+	Dim       = 1 << 1,
+	Italic    = 1 << 2,
+	Underline = 1 << 3,
+	Blink     = 1 << 4,
+	Reverse   = 1 << 5,
+};
+
+struct Style {
+	enum Attr attr;
+	int bg, fg;
+};
+
+struct Cell {
+	struct Style style;
+	wchar_t ch;
+};
+
+enum Mode {
+	Insert = 1 << 0,
+	Wrap   = 1 << 1,
+	Cursor = 1 << 2,
+};
+
+enum { ParamCap = 16 };
+
+struct Term {
+	uint rows, cols;
+	char state;
+	struct {
+		bool q;
+		uint s[ParamCap];
+		uint n, i;
+	} param;
+	enum Mode mode;
+	struct {
+		uint y, x;
+	} save;
+	struct {
+		uint top, bot;
+	} scroll;
+	uint y, x;
+	struct Style style;
+	struct Cell cells[];
+};
+
+struct Term *termAlloc(uint rows, uint cols);
+void termUpdate(struct Term *term, wchar_t ch);
+int termSnapshot(struct Term *term, int fd);