Add EOT message

When program keeps running, the ### EOT message allows the user
to know that the stdin has been fully transmitted.

src/minimodem.1.in

@@ -190,6 +190,9 @@ Filter the received text output, replacing any "non-printable" bytes
 with a '.' character.
 (This option applies to \-\-rx mode only).
 .TP
+.B \-\-print-eot
+Print "### EOT" to stderr after each transmit completes.
+.TP
 .B \-\-tx-carrier
 When transmitting from a blocking source, keep a carrier going while waiting
 for more data.

src/minimodem.c

@@ -46,6 +46,7 @@
 char *program_name = "";
 
 int		tx_transmitting = 0;
+int		tx_print_eot = 0;
 int		tx_leader_bits_len = 2;
 int		tx_trailer_bits_len = 2;
 
@@ -67,6 +68,8 @@ tx_stop_transmit_sighandler( int sig )
 	simpleaudio_tone(tx_sa_out, 0, tx_flush_nsamples);
 
     tx_transmitting = 0;
+    if ( tx_print_eot )
+	fprintf(stderr, "### EOT\n");
 }
 
 
@@ -418,6 +421,7 @@ usage()
     "		    --binary-output\n"
     "		    --binary-raw {nbits}\n"
     "		    --print-filter\n"
+    "		    --print-eot\n"
     "		    --tx-carrier\n"
     "		{baudmode}\n"
     "	    any_number_N       Bell-like      N bps --ascii\n"
@@ -577,6 +581,7 @@ main( int argc, char*argv[] )
 	MINIMODEM_OPT_BINARY_RAW,
 	MINIMODEM_OPT_PRINT_FILTER,
 	MINIMODEM_OPT_XRXNOISE,
+	MINIMODEM_OPT_PRINT_EOT,
 	MINIMODEM_OPT_TXCARRIER
     };
 
@@ -616,6 +621,7 @@ main( int argc, char*argv[] )
 	    { "binary-output",	0, 0, MINIMODEM_OPT_BINARY_OUTPUT },
 	    { "binary-raw",	1, 0, MINIMODEM_OPT_BINARY_RAW },
 	    { "print-filter",	0, 0, MINIMODEM_OPT_PRINT_FILTER },
+	    { "print-eot",	0, 0, MINIMODEM_OPT_PRINT_EOT },
 	    { "Xrxnoise",	1, 0, MINIMODEM_OPT_XRXNOISE },
 	    { "tx-carrier",      0, 0, MINIMODEM_OPT_TXCARRIER },
 	    { 0 }
@@ -749,6 +755,9 @@ main( int argc, char*argv[] )
 	    case MINIMODEM_OPT_TXCARRIER:
 			txcarrier = 1;
 			break;
+	    case MINIMODEM_OPT_PRINT_EOT:
+			tx_print_eot = 1;
+			break;
 	    default:
 			usage();
 	}

tests/16-verify-tx-consistent.test

@@ -19,32 +19,22 @@ trap "rm -f $TMPF.*" 0
 set -e
 
 $MINIMODEM --tx --file $TMPF.1.wav $minimodem_tx_args < "$textfile"
-sum1=$(md5sum -b < $TMPF.1.wav)
-echo "$sum1 $TMPF.1.wav"
-
 sleep 1
-
 $MINIMODEM --tx --file $TMPF.2.wav $minimodem_tx_args < "$textfile"
-sum2=$(md5sum -b < $TMPF.2.wav)
-echo "$sum2 $TMPF.2.wav"
-
 sleep 1
-
 $MINIMODEM --tx --file $TMPF.3.wav $minimodem_tx_args < "$textfile"
-sum3=$(md5sum -b < $TMPF.3.wav)
-echo "$sum3 $TMPF.3.wav"
 
-[ "$sum1" == "$sum2" ] || {
+cmp -s $TMPF.1.wav $TMPF.2.wav || {
     echo -e "TX-NOT-CONSISTENT"
     exit 1
 }
 
-[ "$sum1" == "$sum3" ] || {
+cmp -s $TMPF.1.wav $TMPF.3.wav || {
     echo -e "TX-NOT-CONSISTENT"
     exit 1
 }
 
-stats="$sum1"
+stats="three runs of '--tx $minimodem_tx_args' created identical output"
 
 result="OK     "
 exitcode=0