Provide local-echo option.

Can be switched on with -e on the command line.
Can be toggled with Ctrl t e while program is running.

man/tio.1

@@ -51,6 +51,11 @@ However, if the
 .B \-\-no\-autoconnect
 option is provided, tio will exit if the device is not present or an established connection is lost.
 
+.TP
+.BR \-e ", " "\-\-local\-echo
+
+Enable local echo.
+
 .TP
 .BR \-l ", " "\-\-log " \fI<filename>
 
@@ -100,6 +105,8 @@ List available key commands
 Send serial break (triggers SysRq on Linux, etc.)
 .IP "\fBctrl-t c"
 Show configuration (baudrate, databits, etc.)
+.IP "\fBctrl-t e"
+Toggle local echo mode
 .IP "\fBctrl-t h"
 Toggle hexadecimal mode
 .IP "\fBctrl-t l"

src/bash-completion/tio.in

@@ -33,6 +33,10 @@ _tio()
             COMPREPLY=( $(compgen -W "5 6 7 8" -- ${cur}) )
             return 0
             ;;
+        -h | --local-echo)
+            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+            return 0
+            ;;
         -f | --flow)
             COMPREPLY=( $(compgen -W "hard soft none" -- ${cur}) )
             return 0

src/include/tio/options.h

@@ -39,6 +39,7 @@ struct option_t
     int output_delay;
     bool no_autoconnect;
     bool log;
+    bool local_echo;
     const char *log_filename;
     const char *map;
 };

src/include/tio/tty.h

@@ -25,6 +25,7 @@
 #define KEY_QUESTION 0x3f
 #define KEY_B 0x62
 #define KEY_C 0x63
+#define KEY_E 0x65
 #define KEY_H 0x68
 #define KEY_L 0x6C
 #define KEY_Q 0x71

src/options.c

@@ -45,6 +45,7 @@ struct option_t option =
     0,        // No output delay
     false,    // No autoconnect
     false,    // No log
+    false,    // No local echo
     "",       // Log filename
     ""        // Map string
 };
@@ -61,6 +62,7 @@ void print_help(char *argv[])
     printf("  -p, --parity odd|even|none  Parity (default: none)\n");
     printf("  -o, --output-delay <ms>     Output delay (default: 0)\n");
     printf("  -n, --no-autoconnect        Disable automatic connect\n");
+    printf("  -e, --local-echo            Do local echo\n");
     printf("  -l, --log <filename>        Log to file\n");
     printf("  -m, --map <flags>           Map special characters\n");
     printf("  -v, --version               Display version\n");
@@ -108,6 +110,7 @@ void parse_options(int argc, char *argv[])
             {"stopbits",       required_argument, 0, 's'},
             {"parity",         required_argument, 0, 'p'},
             {"output-delay",   required_argument, 0, 'o'},
+            {"local-echo",     no_argument,       0, 'e'},
             {"no-autoconnect", no_argument,       0, 'n'},
             {"log",            required_argument, 0, 'l'},
             {"map",            required_argument, 0, 'm'},
@@ -120,7 +123,7 @@ void parse_options(int argc, char *argv[])
         int option_index = 0;
 
         /* Parse argument using getopt_long */
-        c = getopt_long(argc, argv, "b:d:f:s:p:o:nl:m:vh", long_options, &option_index);
+        c = getopt_long(argc, argv, "b:d:f:s:p:o:nl:m:vhe", long_options, &option_index);
 
         /* Detect the end of the options */
         if (c == -1)
@@ -146,6 +149,10 @@ void parse_options(int argc, char *argv[])
                 option.databits = string_to_long(optarg);
                 break;
 
+            case 'e':
+		option.local_echo = true;
+                break;
+
             case 'f':
                 option.flow = optarg;
                 break;

src/tty.c

@@ -100,6 +100,7 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
                 tio_printf(" ctrl-t ?   List available key commands");
                 tio_printf(" ctrl-t b   Send break");
                 tio_printf(" ctrl-t c   Show configuration");
+                tio_printf(" ctrl-t e   Toggle local echo mode");
                 tio_printf(" ctrl-t h   Toggle hexadecimal mode");
                 tio_printf(" ctrl-t l   Clear screen");
                 tio_printf(" ctrl-t q   Quit");
@@ -119,6 +120,7 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
                 tio_printf(" Flow: %s", option.flow);
                 tio_printf(" Stopbits: %d", option.stopbits);
                 tio_printf(" Parity: %s", option.parity);
+                tio_printf(" Local Echo: %s", option.local_echo ? "yes":"no");
                 tio_printf(" Output delay: %d", option.output_delay);
                 if (option.map[0] != 0)
                     tio_printf(" Map flags: %s", option.map);
@@ -126,6 +128,10 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
                     tio_printf(" Log file: %s", option.log_filename);
                 break;
 
+            case KEY_E:
+                option.local_echo = !option.local_echo;
+                break;
+
             case KEY_H:
                 /* Toggle hexadecimal printing mode */
                 if (print_mode == NORMAL)
@@ -511,6 +517,15 @@ void tty_restore(void)
         tty_disconnect();
 }
 
+static void optional_local_echo(char c)
+{
+    if (!option.local_echo)
+        return;
+    print(c);
+    if (option.log)
+        log_write(c);
+}
+
 int tty_connect(void)
 {
     fd_set rdfs;           /* Read file descriptor set */
@@ -657,6 +672,7 @@ int tty_connect(void)
                     if ((output_char == '\n') && (map_onlcrnl)) {
                         char r = '\r';
 
+                        optional_local_echo(r);
                         status = write(fd, &r, 1);
                         if (status < 0)
                             warning_printf("Could not write to tty device");
@@ -666,6 +682,7 @@ int tty_connect(void)
                     }
 
                     /* Send output to tty device */
+                    optional_local_echo(output_char);
                     status = write(fd, &output_char, 1);
                     if (status < 0)
                         warning_printf("Could not write to tty device");