Splitting into separate files.

term.c

@@ -0,0 +1,86 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include "abuf.h"
+#include "core.h"
+#include "term.h"
+
+#define ESCSEQ "\x1b["
+
+
+static struct termios saved_entry_term;
+
+
+void
+enable_termraw(void)
+{
+	struct termios raw;
+
+	if (tcgetattr(STDIN_FILENO, &raw) == -1) {
+		die("tcgetattr while enabling raw mode");
+	}
+
+	cfmakeraw(&raw);
+	raw.c_cc[VMIN]  = 0;
+	raw.c_cc[VTIME] = 1;
+
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
+		die("tcsetattr while enabling raw mode");
+	}
+}
+
+
+void
+display_clear(abuf *ab)
+{
+	if (ab == NULL) {
+		kwrite(STDOUT_FILENO, ESCSEQ "2J", 4);
+		kwrite(STDOUT_FILENO, ESCSEQ "H", 3);
+	} else {
+		ab_append(ab, ESCSEQ "2J", 4);
+		ab_append(ab, ESCSEQ "H", 3);
+	}
+}
+
+
+void
+disable_termraw(void)
+{
+	display_clear(NULL);
+
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_entry_term) == -1) {
+		die("couldn't disable terminal raw mode");
+	}
+}
+
+
+void
+setup_terminal(void)
+{
+	if (tcgetattr(STDIN_FILENO, &saved_entry_term) == -1) {
+		die("can't snapshot terminal settings");
+	}
+
+	enable_termraw();
+}
+
+
+int
+get_winsz(int *rows, int *cols)
+{
+	struct winsize ws;
+
+	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
+		return -1;
+	}
+
+	*cols = ws.ws_col;
+	*rows = ws.ws_row;
+
+	return 0;
+}