From 2300d2813a524cbfeabac794335e7abe99263df6 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Tue, 29 Dec 2015 23:10:50 -0500
Subject: initial commit

---
 oldcurses.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 oldcurses.c

(limited to 'oldcurses.c')

diff --git a/oldcurses.c b/oldcurses.c
new file mode 100644
index 0000000..44ff6b3
--- /dev/null
+++ b/oldcurses.c
@@ -0,0 +1,138 @@
+/* curses wrappers.
+	The original code uses curses, cc65 uses conio, so I wrote this stuff
+	to map the curses calls to conio ones.
+	Later on, just replaced all the curses stuff (except clrtobot() and
+	clrtoeol()) with direct calls to conio.
+	Keeping this around in case it's useful for porting some other
+	curses app to cc65. */
+
+/* original plan was to use time() or _systime(). It turns out that
+	these are not implemented on the Atari, and always return -1.
+	So, use the OS's countdown timer instead.
+	Anyone porting to another cc65 platform needs to rewrite this.
+
+	TODO: rewrite in terms of clock() and CLOCKS_PER_SEC. Will make it
+	less atari-specific, plus auto-adjust for pal/ntsc.
+
+	TODO: there is atari-specific stuff elsewhere in the code :(
+ */
+
+static unsigned int tmout_jiffies = 0;
+
+/*
+void timeout(unsigned int msec) {
+	if(msec > 0)
+		tmout_jiffies = (msec / 100) * 6; // TODO: should be 5 for PAL
+	else
+		tmout_jiffies = 0;
+}
+*/
+
+/* set timer with interrupts disabled, to avoid race condition
+   where an interrupt happens between setting the high & low bytes. */
+void start_timer() {
+	__asm__("SEI");
+	POKE(541, tmout_jiffies / 256);
+	POKE(540, tmout_jiffies % 256);
+	__asm__("CLI");
+}
+
+/* this getch() works like curses, except it always acts
+	like it's in cbreak mode. */
+int getch() {
+	int ret = -1;
+
+	if(tmout_jiffies == 0) return cgetc();
+
+	start_timer();
+
+	do {
+		if(kbhit()) {
+			ret = cgetc();
+			break;
+		}
+	} while (timer_running());
+
+	return ret;
+}
+
+#define timer_running() (PEEK(541) || PEEK(540))
+#define timer_expired() (!timer_running())
+
+int flushinp() {
+	POKE(764, 255);
+	return 0;
+}
+
+void clrtobot() {
+	unsigned char rows, cols, y, oldx, oldy;
+	oldx = wherex();
+	oldy = wherey();
+	screensize(&cols, &rows);
+	cclear(cols - wherex()); /* leaves cursor at start of next line */
+	for(y = wherey(); y < rows; y++)
+		cclearxy(0, y, cols);
+	gotoxy(oldx, oldy);
+}
+
+/* one-to-one mapping between some of the conio API and the curses one */
+#define clear() clrscr()
+#define printw cprintf
+#define curs_set(x) cursor(x)
+
+/* conio doesn't do deferred printing, refresh() is a no-op */
+#define refresh()
+
+/* we don't support cooked or raw mode, cbreak() is a no-op */
+#define cbreak()
+
+/* we don't support echo mode */
+#define noecho()
+
+/* curses move() takes args in the opposite order to gotoxy() */
+#define move(a, b) gotoxy(b, a)
+
+/* our attrset() only supports A_NORMAL and A_REVERSE, since
+	the Atari can only print normal and reverse video. */
+#define A_NORMAL 0
+#define A_REVERSE 1
+#define attrset(x) revers(x)
+
+/**** atari-specific stuff */
+
+/* original plan was to use time() or _systime(). It turns out that
+	these are not implemented on the Atari, and always return -1.
+	So, use the OS's countdown timer instead.
+	Anyone porting to another cc65 platform needs to rewrite this.
+
+	TODO: rewrite in terms of clock() and CLOCKS_PER_SEC. Will make it
+	less atari-specific, plus auto-adjust for pal/ntsc.
+
+	TODO: there is atari-specific stuff elsewhere in the code :(
+ */
+
+static unsigned int tmout_jiffies = 0;
+
+void timeout(unsigned int msec) {
+	if(msec > 0)
+		tmout_jiffies = (msec / 100) * 6; // TODO: should be 5 for PAL
+	else
+		tmout_jiffies = 0;
+}
+
+/* set timer with interrupts disabled, to avoid race condition
+   where an interrupt happens between setting the high & low bytes. */
+void start_timer() {
+	__asm__("SEI");
+	POKE(541, tmout_jiffies / 256);
+	POKE(540, tmout_jiffies % 256);
+	__asm__("CLI");
+}
+
+#define timer_running() (PEEK(541) || PEEK(540))
+#define timer_expired() (!timer_running())
+
+int flushinp() {
+	POKE(764, 255);
+	return 0;
+}
-- 
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