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#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "watdefs.h"
#include "afuncs.h"
#include "date.h"
/* Code to extract TLEs for a particular date (MJD). It looks
through all TLEs listed in 'tle_list.txt' and outputs those matching
the MJD given on the command line. */
char path[100];
int verbose;
static void extract_tle_for_date( const char *fname, const double mjd)
{
char prev_line[100], buff[100];
FILE *ifile = fopen( fname, "rb");
double step = 0.;
assert( strlen( fname) < 20);
assert( strlen( path) < 60);
strcpy( buff, path);
strcat( buff, fname);
ifile = fopen( buff, "rb");
if( !ifile)
{
printf( "'%s' not opened\n", fname);
exit( -1);
}
if( verbose)
printf( "Looking at '%s' for %f\n", fname, mjd);
*prev_line = '\0';
while( fgets( buff, sizeof( buff), ifile))
{
if( !memcmp( buff, "# MJD ", 6) && atof( buff + 6) <= mjd
&& atof( buff + 6) + step > mjd)
{
size_t i;
printf( "%s", prev_line); /* show 'worst residual' data */
for( i = 0; i < 3 && fgets( buff, sizeof( buff), ifile); i++)
printf( "%s", buff); /* obj name, lines 1 and 2 of TLE */
fclose( ifile);
return;
}
else if( !memcmp( buff, "# Ephem range: ", 15))
{
double mjd1, mjd2;
if( sscanf( buff + 15, "%lf %lf %lf", &mjd1, &mjd2, &step) != 3)
{
printf( "Ephem step problem in '%s'\n'%s'\n",
fname, buff);
exit( -2);
}
if( mjd < mjd1 || mjd > mjd2)
{
if( verbose)
printf( "'%s': outside range\n", fname);
fclose( ifile);
return;
}
}
else if( !memcmp( buff, "# Include ", 10))
{
int i = 0;
char *filename = buff + 10;
while( buff[i] >= ' ')
i++;
buff[i] = '\0';
if( memcmp( filename, "classfd", 7) && memcmp( filename, "inttles", 7)
&& memcmp( filename, "all_tle", 7)
&& memcmp( filename, "old_tle", 7))
extract_tle_for_date( filename, mjd);
}
strcpy( prev_line, buff);
}
fclose( ifile);
}
static void err_exit( void)
{
printf( "tle_date (MJD)\n");
exit( -1);
}
#ifdef ON_LINE_VERSION
int dummy_main( const int argc, const char **argv)
#else
int main( const int argc, const char **argv)
#endif
{
const double jan_1_1970 = 2440587.5;
const double curr_t = jan_1_1970 + (double)time( NULL) / seconds_per_day;
double mjd;
if( argc < 2)
err_exit( );
mjd = atof( argv[1]);
mjd = get_time_from_string( curr_t, argv[1], FULL_CTIME_YMD, NULL)
- 2400000.5;
if( mjd < 40000 || mjd > 65000)
err_exit( );
if( argc > 2)
strcpy( path, argv[2]);
if( argc > 3)
verbose = 1;
extract_tle_for_date( "tle_list.txt", mjd);
return( 0);
}
#ifdef ON_LINE_VERSION
void avoid_runaway_process( const int max_time_to_run); /* cgi_func.c */
int get_urlencoded_form_data( const char **idata, /* cgi_func.c */
char *field, const size_t max_field,
char *buff, const size_t max_buff);
int main( const int unused_argc, const char **unused_argv)
{
const char *argv[20];
const size_t max_buff_size = 40000;
char *buff = (char *)malloc( max_buff_size);
char *idata = (char *)malloc( max_buff_size);
const char *tptr = idata;
char field[30], date_text[80];
FILE *lock_file = fopen( "lock.txt", "w");
extern char **environ;
avoid_runaway_process( 15);
*idata = '\0';
for( size_t i = 0; environ[i]; i++)
if( !memcmp( environ[i], "QUERY_STRING=", 13))
strcpy( idata, environ[i] + 13);
printf( "Content-type: text/html\n\n");
printf( "<html> <body> <pre>\n");
if( !lock_file)
{
printf( "<p> Server is busy. Try again in a minute or two. </p>");
printf( "<p> Your TLEs are very important to us! </p>");
return( 0);
}
fprintf( lock_file, "We're in\n");
for( size_t i = 0; environ[i]; i++)
fprintf( lock_file, "%s\n", environ[i]);
if( !*idata) /* must be POST rather than GET */
if( !fgets( idata, max_buff_size, stdin))
{
printf( "<p> Well, that's weird. There's no input. </p>");
return( -1);
}
strcpy( date_text, "now");
while( !get_urlencoded_form_data( &tptr, field, sizeof( field),
buff, max_buff_size))
{
if( !strcmp( field, "date") && strlen( buff) < 70)
{
strncpy( date_text, buff, sizeof( date_text));
date_text[sizeof( date_text) - 1] = '\0';
}
}
free( buff);
free( idata);
argv[0] = "tle_date";
argv[1] = date_text;
argv[2] = "/home/projectp/public_html/tles/";
argv[3] = NULL;
dummy_main( 3, argv);
printf( "</pre> </body> </html>");
fclose( lock_file);
return( 0);
}
#endif
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