More error checking.

src/config.c

@@ -1,7 +1,7 @@
 //
 //    This file is part of Dire Wolf, an amateur radio packet TNC.
 //
-//    Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2021  John Langner, WB2OSZ
+//    Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2021, 2023  John Langner, WB2OSZ
 //
 //    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
@@ -755,12 +755,13 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	  strlcpy (p_audio_config->adev[adevice].adevice_out, DEFAULT_ADEVICE, sizeof(p_audio_config->adev[adevice].adevice_out));
 
 	  p_audio_config->adev[adevice].defined = 0;
+	  p_audio_config->adev[adevice].copy_from = -1;
 	  p_audio_config->adev[adevice].num_channels = DEFAULT_NUM_CHANNELS;		/* -2 stereo */
 	  p_audio_config->adev[adevice].samples_per_sec = DEFAULT_SAMPLES_PER_SEC;	/* -r option */
 	  p_audio_config->adev[adevice].bits_per_sample = DEFAULT_BITS_PER_SAMPLE;	/* -8 option for 8 instead of 16 bits */
 	}
 
-	p_audio_config->adev[0].defined = 1;
+	p_audio_config->adev[0].defined = 2;		// 2 means it was done by default and not the user's config file.
 
 	for (channel=0; channel<MAX_CHANS; channel++) {
 	  int ot, it;
@@ -925,10 +926,13 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 
 	p_misc_config->maxframe_extended = AX25_K_MAXFRAME_EXTENDED_DEFAULT;	/* Max frames to send before ACK.  mod 128 "Window" size. */
 
-	p_misc_config->maxv22 = AX25_N2_RETRY_DEFAULT / 3;	/* Max SABME before falling back to SABM. */
+	p_misc_config->maxv22 = AX25_N2_RETRY_DEFAULT / 3;	/* Send SABME this many times before falling back to SABM. */
-	p_misc_config->v20_addrs = NULL;			/* Go directly to v2.0 for stations listed. */
+	p_misc_config->v20_addrs = NULL;			/* Go directly to v2.0 for stations listed */
+								/* without trying v2.2 first. */
 	p_misc_config->v20_count = 0;
 	p_misc_config->noxid_addrs = NULL;			/* Don't send XID to these stations. */
+								/* Might work with a partial v2.2 implementation */
+								/* on the other end. */
 	p_misc_config->noxid_count = 0;
 
 /* 
@@ -1013,6 +1017,10 @@ void config_init (char *fname, struct audio_s *p_audio_config,
  *			ADEVICE	   plughw:2,0  plughw:3,0	-- different in/out for a channel or channel pair.
  *			ADEVICE1   udp:7355  default		-- from Software defined radio (SDR) via UDP.
  *
+ *	New in 1.8: Ability to map to another audio device.
+ *	This allows multiple modems (i.e. data speeds) on the same audio interface.
+ *
+ *			ADEVICEn   = n				-- Copy from different already defined channel.
  */
 
 	  /* Note that ALSA name can contain comma such as hw:1,0 */
@@ -1040,9 +1048,32 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	      exit(EXIT_FAILURE);
 	    }
 
+	    // Do not allow same adevice to be defined more than once.
+	    // Overriding the default for adevice 0 is ok.
+	    // In that case definded was 2.  That's why we check for 1, not just non-zero.
+
+	    if (p_audio_config->adev[adevice].defined == 1) {		// 1 means defined by user.
+	      text_color_set(DW_COLOR_ERROR);
+	      dw_printf ("Config file: ADEVICE%d can't be defined more than once. Line %d.\n", adevice, line);
+	      continue;
+	    }
+
 	    p_audio_config->adev[adevice].defined = 1;
 
+	    // New case for release 1.8.
+
+	    if (strcmp(t, "=") == 0) {
+	      t = split(NULL,0);
+	      if (t != NULL) {
+	        
+	      }
+
+/////////  to be continued....  FIXME
+
+	    }
+	    else {
 	      /* First channel of device is valid. */
+	      // This might be changed to UDP or STDIN when the device name is examined.
 	      p_audio_config->chan_medium[ADEVFIRSTCHAN(adevice)] = MEDIUM_RADIO;
 
 	      strlcpy (p_audio_config->adev[adevice].adevice_in, t, sizeof(p_audio_config->adev[adevice].adevice_in));
@@ -1050,9 +1081,11 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 
 	      t = split(NULL,0);
 	      if (t != NULL) {
+		// Different audio devices for receive and transmit.
 	        strlcpy (p_audio_config->adev[adevice].adevice_out, t, sizeof(p_audio_config->adev[adevice].adevice_out));
 	      }
 	    }
+	  }
 
 
 /*
@@ -2173,7 +2206,7 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	    else {
 	      p_audio_config->achan[channel].slottime = DEFAULT_SLOTTIME;
 	      text_color_set(DW_COLOR_ERROR);
-              dw_printf ("Line %d: Invalid delay time for persist algorithm. Using %d.\n", 
+              dw_printf ("Line %d: Invalid delay time for persist algorithm. Using default %d.\n", 
 			line, p_audio_config->achan[channel].slottime);
    	    }
 	  }
@@ -2197,7 +2230,7 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	    else {
 	      p_audio_config->achan[channel].persist = DEFAULT_PERSIST;
 	      text_color_set(DW_COLOR_ERROR);
-              dw_printf ("Line %d: Invalid probability for persist algorithm. Using %d.\n", 
+              dw_printf ("Line %d: Invalid probability for persist algorithm. Using default %d.\n", 
 			line, p_audio_config->achan[channel].persist);
    	    }
 	  }
@@ -2216,6 +2249,19 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	    }
 	    n = atoi(t);
             if (n >= 0 && n <= 255) {
+	      text_color_set(DW_COLOR_ERROR);
+	      if (n == 0) {
+                dw_printf ("Line %d: Setting TXDELAY to 0 is a REALLY BAD idea if you want other stations to hear you.\n", 
+			line);
+                dw_printf ("Line %d: See User Guide, \"Radio Channel - Transmit Timing\" for an explanation.\n", 
+			line);
+	      }
+	      if (n >= 100) {
+                dw_printf ("Line %d: Keeping with tradition, going back to the 1980s, TXDELAY is in 10 millisecond units.\n", 
+			line);
+                dw_printf ("Line %d: The value %d would be %.3f seconds which seems rather excessive.  Are you sure you want that?\n", 
+			line, n, (double)n * 10. / 1000.);
+	      }
 	      p_audio_config->achan[channel].txdelay = n;
 	    }
 	    else {
@@ -2240,6 +2286,18 @@ void config_init (char *fname, struct audio_s *p_audio_config,
 	    }
 	    n = atoi(t);
             if (n >= 0 && n <= 255) {
+	      if (n == 0) {
+                dw_printf ("Line %d: Setting TXTAIL to 0 is a REALLY BAD idea if you want other stations to hear you.\n", 
+			line);
+                dw_printf ("Line %d: See User Guide, \"Radio Channel - Transmit Timing\" for an explanation.\n", 
+			line);
+	      }
+	      if (n >= 50) {
+                dw_printf ("Line %d: Keeping with tradition, going back to the 1980s, TXTAIL is in 10 millisecond units.\n", 
+			line);
+                dw_printf ("Line %d: The value %d would be %.3f seconds which seems rather excessive.  Are you sure you want that?\n", 
+			line, n, (double)n * 10. / 1000.);
+	      }
 	      p_audio_config->achan[channel].txtail = n;
 	    }
 	    else {