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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 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: APRStt gateway.
*
* Description: Transfer touch tone messages into the APRS network.
*
* 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 might be appropriate.
// What do we call the parts separated by * key? Entry? Field?
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <assert.h>
#include "direwolf.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"
#if __WIN32__
char *strtok_r(char *str, const char *delim, char **saveptr);
#endif
#include "utm/LatLong-UTMconversion.h"
//TODO: #include "tt_user.h"
/*
* Touch Tone sequences are accumulated here until # terminator found.
* Kept separate for each audio channel.
*/
#define MAX_MSG_LEN 100
static char msg_str[MAX_CHANS][MAX_MSG_LEN+1];
static int msg_len[MAX_CHANS];
static void aprs_tt_message (int chan, char *msg);
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);
/*------------------------------------------------------------------
*
* 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_MACRO, "xxyyy", .macro.definition = "B9xx*AB166*AA2B4C5B3B0Ayyy" },
};
#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
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);
// 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 == '#') {
/* Process complete message. */
aprs_tt_message (chan, msg_str[chan]);
msg_len[chan] = 0;
msg_str[chan][0] = '\0';
}
}
else {
/* Idle time. Poll occasionally for processing. */
poll_period++;
if (poll_period >= 39) {
poll_period = 0;
tt_user_background ();
}
}
} /* end aprs_tt_button */
#endif
/*------------------------------------------------------------------
*
* Name: aprs_tt_message
*
* 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 message.
* It should have one or more fields separatedy by *
* and terminated by a final # like these:
*
* callsign #
* entry1 * callsign #
* entry1 * entry * callsign #
*
*----------------------------------------------------------------*/
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;
static double m_longitude;
static double m_latitude;
static char m_comment[200];
static char m_freq[12];
static char m_mic_e;
static char m_dao[6];
static int m_ssid;
//#define G_UNKNOWN -999999
void aprs_tt_message (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;
/*
* This takes the place of the usual line with audio level.
* Do it here, rather than in process_rec_frame, so any
* error messages are associated with the DTMF message
* rather than the most recent regular AX.25 frame.
*/
#ifndef TT_MAIN
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\nDTMF message\n");
#endif
/*
* The parse functions will fill these in.
*/
strcpy (m_callsign, "");
m_symtab_or_overlay = '\\';
m_symbol_code = 'A';
m_longitude = G_UNKNOWN;
m_latitude = G_UNKNOWN;
strcpy (m_comment, "");
strcpy (m_freq, "");
m_mic_e = ' ';
strcpy (m_dao, "!T !"); /* start out unknown */
m_ssid = 12;
/*
* Send raw touch tone data to application.
*/
raw_tt_data_to_app (chan, msg);
/*
* Parse the touch tone sequence.
*/
err = parse_fields (msg);
#if defined(DEBUG) || defined(TT_MAIN)
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 (err == 0) {
/*
* Digested successfully. Add to our list of users and schedule transmissions.
*/
#ifndef TT_MAIN
err = tt_user_heard (m_callsign, m_ssid, m_symtab_or_overlay, m_symbol_code, m_latitude, m_longitude,
m_freq, m_comment, m_mic_e, m_dao);
#endif
}
// TODO send response to user.
// err == 0 OK, others, suitable error response.
} /* end aprs_tt_message */
/*------------------------------------------------------------------
*
* 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 separatedy 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;
strcpy (stemp, msg);
e = strtok_r (stemp, "*#", &save);
while (e != NULL) {
switch (*e) {
case 'A':
switch (e[1]) {
case 'A':
parse_object_name (e);
break;
case 'B':
parse_symbol (e);
break;
default:
parse_callsign (e);
break;
}
break;
case 'B':
parse_location (e);
break;
case 'C':
parse_comment (e);
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
expand_macro (e);
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 ("Entry does not start with A, B, C, or digit: \"%s\"\n", msg);
return (TT_ERROR_D_MSG);
}
e = strtok_r (NULL, "*#", &save);
}
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.
*
*----------------------------------------------------------------*/
static int expand_macro (char *e)
{
int len;
int ipat;
char xstr[20], ystr[20], zstr[20], bstr[20], dstr[20];
char stemp[MAX_MSG_LEN+1];
char *d, *s;
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);
if (ipat >= 0) {
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 ("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.
*/
strcpy (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':
strcat (stemp, xstr);
break;
case 'y':
strcat (stemp, ystr);
break;
case 'z':
strcat (stemp, zstr);
break;
default:
{
char c1[2];
c1[0] = *d;
c1[1] = '\0';
strcat (stemp, c1);
}
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])) {
strcpy (m_callsign, e+1);
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], 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[4];
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 4 groups:
*
* * points
* * vector
* * grid
* * utm
*
*----------------------------------------------------------------*/
/* Average radius of earth in meters. */
#define R 6371000.
/* Convert between degrees and radians. */
#define D2R(a) ((a) * 2. * M_PI / 360.)
#define R2D(a) ((a) * 360. / (2*M_PI))
static int parse_location (char *e)
{
int len;
int ipat;
char xstr[20], ystr[20], zstr[20], bstr[20], dstr[20];
double x, y, dist, bearing;
double lat0, lon0;
double lat9, lon9;
double easting, northing;
assert (*e == 'B');
m_dao[2] = e[0];
m_dao[3] = e[1]; /* Type of location. e.g. !TB6! */
/* Will be changed by point types. */
/* If this ever changes, be sure to update corresponding */
/* section in process_comment() in decode_aprs.c */
len = strlen(e);
ipat = find_ttloc_match (e, xstr, ystr, zstr, bstr, dstr);
if (ipat >= 0) {
//dw_printf ("ipat=%d, x=%s, y=%s, b=%s, d=%s\n", ipat, xstr, ystr, bstr, dstr);
switch (tt_config.ttloc_ptr[ipat].type) {
case TTLOC_POINT:
m_latitude = tt_config.ttloc_ptr[ipat].point.lat;
m_longitude = tt_config.ttloc_ptr[ipat].point.lon;
/* Is it one of ten or a hundred positions? */
/* It's not hardwired to always be B0n or B9nn. */
/* This is a pretty good approximation. */
if (strlen(e) == 3) { /* probably B0n --> !Tn ! */
m_dao[2] = e[2];
m_dao[3] = ' ';
}
if (strlen(e) == 4) { /* probably B9nn --> !Tnn! */
m_dao[2] = e[2];
m_dao[3] = e[3];
}
break;
case TTLOC_VECTOR:
if (strlen(bstr) != 3) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Bearing \"%s\" should be 3 digits.\n", bstr);
// return error code?
}
if (strlen(dstr) < 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Distance \"%s\" should 1 or more digits.\n", dstr);
// return error code?
}
lat0 = D2R(tt_config.ttloc_ptr[ipat].vector.lat);
lon0 = D2R(tt_config.ttloc_ptr[ipat].vector.lon);
dist = atof(dstr) * tt_config.ttloc_ptr[ipat].vector.scale;
bearing = D2R(atof(bstr));
/* Equations and caluculators found here: */
/* http://movable-type.co.uk/scripts/latlong.html */
m_latitude = R2D(asin(sin(lat0) * cos(dist/R) + cos(lat0) * sin(dist/R) * cos(bearing)));
m_longitude = R2D(lon0 + atan2(sin(bearing) * sin(dist/R) * cos(lat0),
cos(dist/R) - sin(lat0) * sin(D2R(m_latitude))));
break;
case TTLOC_GRID:
if (strlen(xstr) == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Missing X coordinate.\n");
strcpy (xstr, "0");
}
if (strlen(ystr) == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Missing Y coordinate.\n");
strcpy (ystr, "0");
}
lat0 = tt_config.ttloc_ptr[ipat].grid.lat0;
lat9 = tt_config.ttloc_ptr[ipat].grid.lat9;
y = atof(ystr);
m_latitude = lat0 + y * (lat9-lat0) / (pow(10., strlen(ystr)) - 1.);
lon0 = tt_config.ttloc_ptr[ipat].grid.lon0;
lon9 = tt_config.ttloc_ptr[ipat].grid.lon9;
x = atof(xstr);
m_longitude = lon0 + x * (lon9-lon0) / (pow(10., strlen(xstr)) - 1.);