swuart/: convert "hammering the peer" demo into a primitive interactive chat

Also rename directory from swuart/ to swuart-chat/, and application from
"swuart" to "chat".

swuart-chat/Makefile

@@ -3,8 +3,8 @@ CFLAGS = -g -Wall -O9 -I../libubb/include
 LDFLAGS = -static
 LDLIBS = -L../libubb -lubb
 
-MAIN = swuart
+MAIN = chat
-OBJS = test.o
+OBJS = chat.o
 
 .PHONY:		all clean spotless
 

swuart-chat/chat.c

@@ -0,0 +1,105 @@
+
+/*
+ * swuart-chat/chat.c - Simple two-way chat using swuart
+ *
+ * Written 2012 by Werner Almesberger
+ * Copyright 2012 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <ubb/ubb.h>
+#include <ubb/swuart.h>
+
+
+#define	RX	UBB_DAT0
+#define	TX	UBB_DAT1
+
+
+/* ----- TTY raw mode ------------------------------------------------------ */
+
+
+static struct termios old_term;
+
+static void raw(void)
+{
+	struct termios term;
+
+	if (tcgetattr(0, &old_term) < 0) {
+		perror("tcgetattr");
+		exit(1);
+	}
+	term = old_term;
+	cfmakeraw(&term);
+	if (tcsetattr(0, TCSAFLUSH, &term) < 0) {
+		perror("tcsetattr");
+		exit(1);
+	}
+	if (fcntl(0, F_SETFL, O_NONBLOCK) < 0) {
+		perror("fcntl");
+		exit(1);
+	}
+}
+
+
+static void restore_term(void)
+{
+	if (tcsetattr(0, TCSAFLUSH, &old_term) < 0)
+		perror("tcsetattr");
+}
+
+
+static void at_exit(void)
+{
+	restore_term();
+	swuart_close();
+}
+
+
+int main(int argc, char **argv)
+{
+	uint8_t local[10], remote[100];
+	int got, i;
+
+	raw();
+	atexit(at_exit);
+	swuart_open(TX, RX, 38400);
+
+	while (1) {
+		got = read(0, local, sizeof(local));
+		if (got < 0 && errno == EAGAIN)
+			got = 0;
+		if (got < 0) {
+			perror("read");
+			exit(1);
+		}
+		if (memchr(local, 3, got))
+			break;
+		got = swuart_trx(local, got, remote, sizeof(remote),
+		    1000, 100);
+		for (i = 0; i != got; i++)
+			if (remote[i] >= ' ' && remote[i] <= '~')
+				printf("%c", remote[i]);
+			else if (remote[i] == 13)
+				printf("\r\n");
+			else if (remote[i] == 8 || remote[i] == 127)
+				printf("\b \b");
+			else
+				printf("\\%02o", remote[i]);
+		fflush(stdout);
+	}
+	printf("\r\n");
+	return 0;
+}

swuart/test.c

@@ -1,56 +0,0 @@
-
-/*
- * swuart/test.c - Software-implemented UART for UBB
- *
- * Written 2012 by Werner Almesberger
- * Copyright 2012 Werner Almesberger
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-
-#include <ubb/ubb.h>
-#include <ubb/swuart.h>
-
-
-#define	RX	UBB_DAT0
-#define	TX	UBB_DAT1
-
-
-static void at_exit(void)
-{
-	swuart_close();
-}
-
-
-int main(int argc, char **argv)
-{
-	uint8_t buf[40];
-	struct swuart_err err;
-	int got, i;
-
-	swuart_open(TX, RX, atoi(argv[1]));
-	atexit(at_exit);
-	while (1) {
-		got = swuart_trx(argv[2], strlen(argv[2]), buf, sizeof(buf),
-		    10000, 100);
-		swuart_get_errors(&err);
-		printf("%d (%d %d %d): ", got,
-		    err.glitch, err.framing, err.overflow);
-		for (i = 0; i != got; i++)
-			if (buf[i] >= ' ' && buf[i] <= '~')
-				printf("%c", buf[i]);
-			else
-				printf("\\%02o", buf[i]);
-		printf("\n");
-		usleep(100);
-	}
-}