From 38c5ae5b60eae9562b97da42f47af3861847f8e5 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sun, 8 May 2022 15:51:35 -0700
Subject: *Proper* serial port for memory downloads. 115200 8O2 RS232 with
 CRTRTS.

---
 tool/con.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 tool/con.c

(limited to 'tool/con.c')

diff --git a/tool/con.c b/tool/con.c
new file mode 100644
index 0000000..8522786
--- /dev/null
+++ b/tool/con.c
@@ -0,0 +1,106 @@
+/* con device */
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <unistd.h>
+
+struct termios save;
+
+void
+host(int fd)
+{
+	int cc;
+	char buf[128];
+
+	for (;;) {
+		cc = read(fd, buf, sizeof buf);
+#ifdef HEX
+		if (cc < 0)
+			break;
+		for (int i = 0; i < cc; ++i) {
+			char hex[3];
+			sprintf(hex, "%02X", (unsigned char) buf[i]);
+			write(1, hex, 2);
+		}
+#else
+		if (cc > 0)
+			write(1, buf, cc);
+		else if (cc < 0)
+			break;
+#endif
+	}
+}
+
+void
+hup(int signo)
+{
+	write(1, "HUP\n", 4);
+	tcsetattr(0, TCSADRAIN, &save);
+	_exit(0);
+}
+
+void
+user(int fd)
+{
+	char c, last = '\r';
+
+	signal(SIGHUP, hup);
+	for (;;)
+		while (read(0, &c, 1) > 0) {
+			if (c == '~' && (last == '\n' || last == '\r'
+					 || last == 4)) {
+				read(0, &c, 1);
+				if (c == '.')
+					return;
+			}
+			write(fd, &c, 1);
+			last = c;
+		}
+}
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	pid_t pid;
+	struct termios t;
+
+	if (argc != 2)
+		exit(1);
+
+	fd = open(argv[1], O_RDWR | O_NDELAY);
+	if (fd < 0)
+		exit(2);
+	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) & ~O_NDELAY);
+	tcgetattr(fd, &t);
+	t.c_cc[VMIN] = 1;
+	t.c_cc[VTIME] = 0;
+	tcsetattr(fd, TCSADRAIN, &t);
+
+	tcgetattr(0, &t);
+	save = t;
+	t.c_iflag = 0;
+	t.c_oflag = 0;
+	t.c_lflag = 0;
+	t.c_cc[VMIN] = 1;
+	t.c_cc[VTIME] = 0;
+	tcsetattr(0, TCSADRAIN, &t);
+
+	if ((pid = fork()) > 0) {
+		user(fd);
+	} else if (pid == 0) {
+		host(fd);
+	} else {
+		perror("fork");
+		_exit(EXIT_FAILURE);
+	}
+
+	tcsetattr(0, TCSADRAIN, &save);
+	kill(pid, SIGKILL);
+	close(fd);
+	_exit(EXIT_SUCCESS);
+}
-- 
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