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aprs_tt.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2013, 2014, 2015 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
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
/*------------------------------------------------------------------
*
* Module: aprs_tt.c
*
* Purpose: First half of APRStt gateway.
*
* Description: This file contains functions to parse the tone sequences
* and extract meaning from them.
*
* tt_user.c maintains information about users and
* generates the APRS Object Reports.
*
*
* References: This is based upon APRStt (TM) documents with some
* artistic freedom.
*
* http://www.aprs.org/aprstt.html
*
*---------------------------------------------------------------*/
#define APRS_TT_C 1
// TODO: clean up terminolgy.
// "Message" has a specific meaning in APRS and this is not it.
// Touch Tone sequence should be appropriate.
// What do we call the parts separated by * key? Entry? Field?
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <assert.h>
#include "direwolf.h"
#include "version.h"
#include "ax25_pad.h"
#include "hdlc_rec2.h" /* for process_rec_frame */
#include "textcolor.h"
#include "aprs_tt.h"
#include "tt_text.h"
#include "tt_user.h"
#include "symbols.h"
#include "latlong.h"
#include "dlq.h"
#include "demod.h" /* for alevel_t & demod_get_audio_level() */
#include "tq.h"
// geotranz
#include "utm.h"
#include "mgrs.h"
#include "usng.h"
#include "error_string.h"
/* Convert between degrees and radians. */
#define D2R(d) ((d) * M_PI / 180.)
#define R2D(r) ((r) * 180. / M_PI)
/*
* Touch Tone sequences are accumulated here until # terminator found.
* Kept separate for each audio channel so the gateway CAN be listening
* on multiple channels at the same time.
*/
#define MAX_MSG_LEN 100
static char msg_str[MAX_CHANS][MAX_MSG_LEN+1];
static int msg_len[MAX_CHANS];
static int parse_fields (char *msg);
static int parse_callsign (char *e);
static int parse_object_name (char *e);
static int parse_symbol (char *e);
static int parse_location (char *e);
static int parse_comment (char *e);
static int expand_macro (char *e);
static void raw_tt_data_to_app (int chan, char *msg);
static int find_ttloc_match (char *e, char *xstr, char *ystr, char *zstr, char *bstr, char *dstr, size_t valstrsize);
#if TT_MAIN
static void check_result (void);
#endif
/*------------------------------------------------------------------
*
* Name: aprs_tt_init
*
* Purpose: Initialize the APRStt gateway at system startup time.
*
* Inputs: Configuration options gathered by config.c.
*
* Global out: Make our own local copy of the structure here.
*
* Returns: None
*
* Description: The main program needs to call this at application
* start up time after reading the configuration file.
*
* TT_MAIN is defined for unit testing.
*
*----------------------------------------------------------------*/
static struct tt_config_s tt_config;
#if TT_MAIN
#define NUM_TEST_CONFIG (sizeof(test_config) / sizeof (struct ttloc_s))
static struct ttloc_s test_config[] = {
{ TTLOC_POINT, "B01", .point.lat = 12.25, .point.lon = 56.25 },
{ TTLOC_POINT, "B988", .point.lat = 12.50, .point.lon = 56.50 },
{ TTLOC_VECTOR, "B5bbbdddd", .vector.lat = 53., .vector.lon = -1., .vector.scale = 1000. }, /* km units */
/* Hilltop Tower http://www.aprs.org/aprs-jamboree-2013.html */
{ TTLOC_VECTOR, "B5bbbddd", .vector.lat = 37+55.37/60., .vector.lon = -(81+7.86/60.), .vector.scale = 16.09344 }, /* .01 mile units */
{ TTLOC_GRID, "B2xxyy", .grid.lat0 = 12.00, .grid.lon0 = 56.00,
.grid.lat9 = 12.99, .grid.lon9 = 56.99 },
{ TTLOC_GRID, "Byyyxxx", .grid.lat0 = 37 + 50./60.0, .grid.lon0 = 81,
.grid.lat9 = 37 + 59.99/60.0, .grid.lon9 = 81 + 9.99/60.0 },
{ TTLOC_MHEAD, "BAxxxxxx", .mhead.prefix = "326129" },
{ TTLOC_SATSQ, "BAxxxx" },
{ TTLOC_MACRO, "xxyyy", .macro.definition = "B9xx*AB166*AA2B4C5B3B0Ayyy" },
{ TTLOC_MACRO, "xxxxzzzzzzzzzz", .macro.definition = "BAxxxx*ACzzzzzzzzzz" },
};
#endif
void aprs_tt_init (struct tt_config_s *p)
{
int c;
#if TT_MAIN
/* For unit testing. */
memset (&tt_config, 0, sizeof(struct tt_config_s));
tt_config.ttloc_size = NUM_TEST_CONFIG;
tt_config.ttloc_ptr = test_config;
tt_config.ttloc_len = NUM_TEST_CONFIG;
/* Don't care about xmit timing or corral here. */
#else
// TODO: Keep ptr instead of making a copy.
memcpy (&tt_config, p, sizeof(struct tt_config_s));
#endif
for (c=0; c<MAX_CHANS; c++) {
msg_len[c] = 0;
msg_str[c][0] = '\0';
}
}
/*------------------------------------------------------------------
*
* Name: aprs_tt_button
*
* Purpose: Process one received button press.
*
* Inputs: chan - Audio channel it came from.
*
* button 0123456789ABCD*# - Received button press.
* $ - No activity timeout.
* space - Quiet time filler.
*
* Returns: None
*
* Description: Individual key presses are accumulated here until
* the # message terminator is found.
* The complete message is then processed.
* The touch tone decoder sends $ if no activity
* for some amount of time, perhaps 5 seconds.
* A partially accumulated messge is discarded if
* there is a long gap.
*
* '.' means no activity during processing period.
* space, between blocks, shouldn't get here.
*
*----------------------------------------------------------------*/
#ifndef TT_MAIN
void aprs_tt_button (int chan, char button)
{
static int poll_period = 0;
assert (chan >= 0 && chan < MAX_CHANS);
//if (button != '.') {
// dw_printf ("aprs_tt_button (%d, '%c')\n", chan, button);
//}
// TODO: Might make more sense to put timeout here rather in the dtmf decoder.
if (button == '$') {
/* Timeout reset. */
msg_len[chan] = 0;
msg_str[chan][0] = '\0';
}
else if (button != '.' && button != ' ') {
if (msg_len[chan] < MAX_MSG_LEN) {
msg_str[chan][msg_len[chan]++] = button;
msg_str[chan][msg_len[chan]] = '\0';
}
if (button == '#') {
/*
* Put into the receive queue like any other packet.
* This way they are all processed by the common receive thread
* rather than the thread associated with the particular audio device.
*/
raw_tt_data_to_app (chan, msg_str[chan]);
msg_len[chan] = 0;
msg_str[chan][0] = '\0';
}
}
else {
/*
* Idle time. Poll occasionally for processing.
* Timing would be off we we are listening to more than
* one channel so do this only for the one specified
* in the TTOBJ command.
*/
if (chan == tt_config.obj_recv_chan) {
poll_period++;
if (poll_period >= 39) {
poll_period = 0;
tt_user_background ();
}
}
}
} /* end aprs_tt_button */
#endif
/*------------------------------------------------------------------
*
* Name: aprs_tt_sequence
*
* Purpose: Process complete received touch tone sequence
* terminated by #.
*
* Inputs: chan - Audio channel it came from.
*
* msg - String of DTMF buttons.
* # should be the final character.
*
* Returns: None
*
* Description: Process a complete tone sequence.
* It should have one or more fields separated by *
* and terminated by a final # like these:
*
* callsign #
* entry1 * callsign #
* entry1 * entry * callsign #
*
* Limitation: Has one set of static data for communication among
* group of functions. This shouldn't be a problem
* when receiving on multiple channels at once
* because they get serialized thru the receive packet queue.
*
*----------------------------------------------------------------*/
static char m_callsign[20]; /* really object name */
/*
* Standard APRStt has symbol code 'A' (box) with overlay of 0-9, A-Z.
*
* Dire Wolf extension allows:
* Symbol table '/' (primary), any symbol code.
* Symbol table '\' (alternate), any symbol code.
* Alternate table symbol code, overlay of 0-9, A-Z.
*/
static char m_symtab_or_overlay;
static char m_symbol_code; // Default 'A'
static char m_loc_text[24];
static double m_longitude; // Set to G_UNKNOWN if not defined.
static double m_latitude; // Set to G_UNKNOWN if not defined.
static int m_ambiguity;
static char m_comment[200];
static char m_freq[12];
static char m_mic_e;
static char m_dao[6];
static int m_ssid; // Default 12 for APRStt user.
void aprs_tt_sequence (int chan, char *msg)
{
int err;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n\"%s\"\n", msg);
#endif
/*
* Discard empty message.
* In case # is there as optional start.
*/
if (msg[0] == '#') return;
/*
* The parse functions will fill these in.
*/
strlcpy (m_callsign, "", sizeof(m_callsign));
m_symtab_or_overlay = '\\';
m_symbol_code = 'A';
strlcpy (m_loc_text, "", sizeof(m_loc_text));
m_longitude = G_UNKNOWN;
m_latitude = G_UNKNOWN;
m_ambiguity = 0;
strlcpy (m_comment, "", sizeof(m_comment));
strlcpy (m_freq, "", sizeof(m_freq));
m_mic_e = ' ';
strlcpy (m_dao, "!T !", sizeof(m_dao)); /* start out unknown */
m_ssid = 12;
/*
* Parse the touch tone sequence.
*/
err = parse_fields (msg);
#if defined(DEBUG)
text_color_set(DW_COLOR_DEBUG);
dw_printf ("callsign=\"%s\", ssid=%d, symbol=\"%c%c\", freq=\"%s\", comment=\"%s\", lat=%.4f, lon=%.4f, dao=\"%s\"\n",
m_callsign, m_ssid, m_symtab_or_overlay, m_symbol_code, m_freq, m_comment, m_latitude, m_longitude, m_dao);
#endif
#if TT_MAIN
check_result (); // for unit testing.
#else
/*
* If digested successfully. Add to our list of users and schedule transmissions.
*/
if (err == 0) {
err = tt_user_heard (m_callsign, m_ssid, m_symtab_or_overlay, m_symbol_code,
m_loc_text, m_latitude, m_longitude, m_ambiguity,
m_freq, m_comment, m_mic_e, m_dao);
}
/*
* If a command / script was supplied, run it now.
* This can do additional processing and provide a custom audible response.
* This is done even for the error case.
*/
char script_response[1000];
strlcpy (script_response, "", sizeof(script_response));
if (strlen(tt_config.ttcmd) > 0) {
dw_run_cmd (tt_config.ttcmd, 1, script_response, sizeof(script_response));
}
/*
* Send response to user by constructing packet with SPEECH or MORSE as destination.
* Source shouldn't matter because it doesn't get transmitted as AX.25 frame.
* Use high priority queue for consistent timing.
*/
char audible_response[1000];
snprintf (audible_response, sizeof(audible_response),
"APRSTT>%s:%s",
tt_config.response[err].method,
(strlen(script_response) > 0) ? script_response : tt_config.response[err].mtext);
packet_t pp;
pp = ax25_from_text (audible_response, 0);
if (pp == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error. Couldn't make frame from \"%s\"\n", audible_response);
return;
}
tq_append (chan, TQ_PRIO_0_HI, pp);
#endif /* ifndef TT_MAIN */
} /* end aprs_tt_sequence */
/*------------------------------------------------------------------
*
* Name: parse_fields
*
* Purpose: Separate the complete string of touch tone characters
* into fields, delimited by *, and process each.
*
* Inputs: msg - String of DTMF buttons.
*
* Returns: None
*
* Description: It should have one or more fields separated by *.
*
* callsign #
* entry1 * callsign #
* entry1 * entry * callsign #
*
* Note that this will be used recursively when macros
* are expanded.
*
* "To iterate is human, to recurse divine."
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
*----------------------------------------------------------------*/
static int parse_fields (char *msg)
{
char stemp[MAX_MSG_LEN+1];
char *e;
char *save;
int err;
//text_color_set(DW_COLOR_DEBUG);
//dw_printf ("parse_fields (%s).\n", msg);
strlcpy (stemp, msg, sizeof(stemp));
e = strtok_r (stemp, "*#", &save);
while (e != NULL) {
//text_color_set(DW_COLOR_DEBUG);
//dw_printf ("parse_fields () field = %s\n", e);
switch (*e) {
case 'A':
switch (e[1]) {
case 'A':
err = parse_object_name (e);
if (err != 0) return (err);
break;
case 'B':
err = parse_symbol (e);
if (err != 0) return (err);
break;
case 'C':
/*
* New in 1.2: test for 10 digit callsign.
*/
if (tt_call10_to_text(e+2,1,stemp) == 0) {
strlcpy(m_callsign, stemp, sizeof(m_callsign));
}
// TODO1.3: else return (?)
break;
default:
err = parse_callsign (e);
break;
}
break;
case 'B':
err = parse_location (e);
if (err != 0) return (err);
break;
case 'C':
err = parse_comment (e);
if (err != 0) return (err);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
err = expand_macro (e);
if (err != 0) return (err);
break;
case '\0':
/* Empty field. Just ignore it. */
/* This would happen if someone uses a leading *. */
break;
default:
text_color_set(DW_COLOR_ERROR);
dw_printf ("Field does not start with A, B, C, or digit: \"%s\"\n", msg);
return (TT_ERROR_D_MSG);
}
e = strtok_r (NULL, "*#", &save);
}
//text_color_set(DW_COLOR_DEBUG);
//dw_printf ("parse_fields () normal return\n");
return (0);
} /* end parse_fields */
/*------------------------------------------------------------------
*
* Name: expand_macro
*
* Purpose: Expand compact form "macro" to full format then process.
*
* Inputs: e - An "entry" extracted from a complete
* APRStt messsage.
* In this case, it should contain only digits.
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
* Description: Separate out the fields, perform substitution,
* call parse_fields for processing.
*
*
* Future: Generalize this to allow any lower case letter for substitution?
*
*----------------------------------------------------------------*/
#define VALSTRSIZE 20
static int expand_macro (char *e)
{
//int len;
int ipat;
char xstr[VALSTRSIZE], ystr[VALSTRSIZE], zstr[VALSTRSIZE], bstr[VALSTRSIZE], dstr[VALSTRSIZE];
char stemp[MAX_MSG_LEN+1];
char *d;
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Macro tone sequence: '%s'\n", e);
//len = strlen(e);
ipat = find_ttloc_match (e, xstr, ystr, zstr, bstr, dstr, VALSTRSIZE);
if (ipat >= 0) {
// Why did we print b & d here?
// Documentation says only x, y, z can be used with macros.
// Only those 3 are processed below.
//dw_printf ("Matched pattern %3d: '%s', x=%s, y=%s, z=%s, b=%s, d=%s\n", ipat, tt_config.ttloc_ptr[ipat].pattern, xstr, ystr, zstr, bstr, dstr);
dw_printf ("Matched pattern %3d: '%s', x=%s, y=%s, z=%s\n", ipat, tt_config.ttloc_ptr[ipat].pattern, xstr, ystr, zstr);
dw_printf ("Replace with: '%s'\n", tt_config.ttloc_ptr[ipat].macro.definition);
if (tt_config.ttloc_ptr[ipat].type != TTLOC_MACRO) {
/* Found match to a different type. Really shouldn't be here. */
/* Print internal error message... */
dw_printf ("expand_macro: type != TTLOC_MACRO\n");
return (TT_ERROR_INTERNAL);
}
/*
* We found a match for the length and any fixed digits.
* Substitute values in to the definition.
*/
strlcpy (stemp, "", sizeof(stemp));
for (d = tt_config.ttloc_ptr[ipat].macro.definition; *d != '\0'; d++) {
while (( *d == 'x' || *d == 'y' || *d == 'z') && *d == d[1]) {
/* Collapse adjacent matching substitution characters. */
d++;
}
switch (*d) {
case 'x':
strlcat (stemp, xstr, sizeof(stemp));
break;
case 'y':
strlcat (stemp, ystr, sizeof(stemp));
break;
case 'z':
strlcat (stemp, zstr, sizeof(stemp));
break;
default:
{
char c1[2];
c1[0] = *d;
c1[1] = '\0';
strlcat (stemp, c1, sizeof(stemp));
}
break;
}
}
/*
* Process as if we heard this over the air.
*/
dw_printf ("After substitution: '%s'\n", stemp);
return (parse_fields (stemp));
}
else {
/* Send reject sound. */
/* Does not match any macro definitions. */
text_color_set(DW_COLOR_ERROR);
dw_printf ("Tone sequence did not match any pattern\n");
return (TT_ERROR_MACRO_NOMATCH);
}
/* should be unreachable */
return (0);
}
/*------------------------------------------------------------------
*
* Name: parse_callsign
*
* Purpose: Extract callsign or object name from touch tone message.
*
* Inputs: e - An "entry" extracted from a complete
* APRStt messsage.
* In this case, it should start with "A".
*
* Outputs: m_callsign
*
* m_symtab_or_overlay - Set to 0-9 or A-Z if specified.
*
* m_symbol_code - Always set to 'A'.
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
* Description: We recognize 3 different formats:
*
* Annn - 3 digits are a tactical callsign. No overlay.
*
* Annnvk - Abbreviation with 3 digits, numeric overlay, checksum.
* Annnvvk - Abbreviation with 3 digits, letter overlay, checksum.
*
* Att...ttvk - Full callsign in two key method, numeric overlay, checksum.
* Att...ttvvk - Full callsign in two key method, letter overlay, checksum.
*
*
*----------------------------------------------------------------*/
static int checksum_not_ok (char *str, int len, char found)
{
int i;
int sum;
char expected;
sum = 0;
for (i=0; i<len; i++) {
if (isdigit(str[i])) {
sum += str[i] - '0';
}
else if (str[i] >= 'A' && str[i] <= 'D') {
sum += str[i] - 'A' + 10;
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("aprs_tt: checksum: bad character \"%c\" in checksum calculation!\n", str[i]);
}
}
expected = '0' + (sum % 10);
if (expected != found) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Bad checksum for \"%.*s\". Expected %c but received %c.\n", len, str, expected, found);
return (TT_ERROR_BAD_CHECKSUM);
}
return (0);
}
static int parse_callsign (char *e)
{
int len;
//int c_length;
char tttemp[40], stemp[30];
assert (*e == 'A');
len = strlen(e);
/*
* special case: 3 digit tactical call.
*/
if (len == 4 && isdigit(e[1]) && isdigit(e[2]) && isdigit(e[3])) {
strlcpy (m_callsign, e+1, sizeof(m_callsign));
return (0);
}
/*
* 3 digit abbreviation: We only do the parsing here.
* Another part of application will try to find corresponding full call.
*/
if ((len == 6 && isdigit(e[1]) && isdigit(e[2]) && isdigit(e[3]) && isdigit(e[4]) && isdigit(e[5])) ||
(len == 7 && isdigit(e[1]) && isdigit(e[2]) && isdigit(e[3]) && isdigit(e[4]) && isupper(e[5]) && isdigit(e[6]))) {
int cs_err = checksum_not_ok (e+1, len-2, e[len-1]);
if (cs_err != 0) {
return (cs_err);
}
strncpy (m_callsign, e+1, 3);
m_callsign[3] = '\0';
if (len == 7) {
tttemp[0] = e[len-3];
tttemp[1] = e[len-2];
tttemp[2] = '\0';
tt_two_key_to_text (tttemp, 0, stemp);
m_symbol_code = 'A';
m_symtab_or_overlay = stemp[0];
}
else {
m_symbol_code = 'A';
m_symtab_or_overlay = e[len-2];
}
return (0);
}
/*
* Callsign in two key format.
*/
if (len >= 7 && len <= 24) {
int cs_err = checksum_not_ok (e+1, len-2, e[len-1]);
if (cs_err != 0) {
return (cs_err);
}
if (isupper(e[len-2])) {
strncpy (tttemp, e+1, len-4);
tttemp[len-4] = '\0';
tt_two_key_to_text (tttemp, 0, m_callsign);
tttemp[0] = e[len-3];
tttemp[1] = e[len-2];
tttemp[2] = '\0';
tt_two_key_to_text (tttemp, 0, stemp);
m_symbol_code = 'A';
m_symtab_or_overlay = stemp[0];
}
else {
strncpy (tttemp, e+1, len-3);
tttemp[len-3] = '\0';
tt_two_key_to_text (tttemp, 0, m_callsign);
m_symbol_code = 'A';
m_symtab_or_overlay = e[len-2];
}
return (0);
}
text_color_set(DW_COLOR_ERROR);
dw_printf ("Touch tone callsign not valid: \"%s\"\n", e);
return (TT_ERROR_INVALID_CALL);
}
/*------------------------------------------------------------------
*
* Name: parse_object_name
*
* Purpose: Extract object name from touch tone message.
*
* Inputs: e - An "entry" extracted from a complete
* APRStt messsage.
* In this case, it should start with "AA".
*
* Outputs: m_callsign
*
* m_ssid - Cleared to remove the default of 12.
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
* Description: Data format
*
* AAtt...tt - Symbol name, two key method, up to 9 characters.
*
*----------------------------------------------------------------*/
static int parse_object_name (char *e)
{
int len;
//int c_length;
//char tttemp[40];
//char stemp[30];
assert (e[0] == 'A');
assert (e[1] == 'A');
len = strlen(e);
/*
* Object name in two key format.
*/
if (len >= 2 + 1 && len <= 30) {
if (tt_two_key_to_text (e+2, 0, m_callsign) == 0) {
m_callsign[9] = '\0'; /* truncate to 9 */
m_ssid = 0; /* No ssid for object name */
return (0);
}
}
text_color_set(DW_COLOR_ERROR);
dw_printf ("Touch tone object name not valid: \"%s\"\n", e);
return (TT_ERROR_INVALID_OBJNAME);
} /* end parse_oject_name */
/*------------------------------------------------------------------
*
* Name: parse_symbol
*
* Purpose: Extract symbol from touch tone message.
*
* Inputs: e - An "entry" extracted from a complete
* APRStt messsage.
* In this case, it should start with "AB".
*
* Outputs: m_symtab_or_overlay
*
* m_symbol_code
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
* Description: Data format
*
* AB1nn - Symbol from primary symbol table.
* Two digits nn are the same as in the GPSCnn
* generic address used as a destination.
*
* AB2nn - Symbol from alternate symbol table.
* Two digits nn are the same as in the GPSEnn
* generic address used as a destination.
*
* AB0nnvv - Symbol from alternate symbol table.
* Two digits nn are the same as in the GPSEnn
* generic address used as a destination.
* vv is an overlay digit or letter in two key method.
*
*----------------------------------------------------------------*/
static int parse_symbol (char *e)
{
int len;
char nstr[3];
int nn;
char stemp[10];
assert (e[0] == 'A');
assert (e[1] == 'B');
len = strlen(e);
if (len >= 4 && len <= 10) {
nstr[0] = e[3];
nstr[1] = e[4];
nstr[2] = '\0';
nn = atoi (nstr);
if (nn < 1) {
nn = 1;
}
else if (nn > 94) {
nn = 94;
}
switch (e[2]) {
case '1':
m_symtab_or_overlay = '/';
m_symbol_code = 32 + nn;
return (0);
break;
case '2':
m_symtab_or_overlay = '\\';
m_symbol_code = 32 + nn;
return (0);
break;
case '0':
if (len >= 6) {
if (tt_two_key_to_text (e+5, 0, stemp) == 0) {
m_symbol_code = 32 + nn;
m_symtab_or_overlay = stemp[0];
return (0);
}
}
break;
}
}
text_color_set(DW_COLOR_ERROR);
dw_printf ("Touch tone symbol not valid: \"%s\"\n", e);
return (TT_ERROR_INVALID_SYMBOL);
} /* end parse_oject_name */
/*------------------------------------------------------------------
*
* Name: parse_location
*
* Purpose: Extract location from touch tone message.
*
* Inputs: e - An "entry" extracted from a complete
* APRStt messsage.
* In this case, it should start with "B".
*
* Outputs: m_latitude
* m_longitude
* m_dao
*
* Returns: 0 for success or one of the TT_ERROR_... codes.
*
* Description: There are many different formats recognizable
* by total number of digits and sometimes the first digit.
*
* We handle most of them in a general way, processing
* them in 5 groups:
*
* * points
* * vector
* * grid