mirror of
https://github.com/eddyem/small_tel.git
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204 lines
7.5 KiB
C
204 lines
7.5 KiB
C
/*
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* This file is part of the mountdaemon_10micron project.
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* Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <usefull_macros.h>
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#include "fitshdr.h"
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#include "mount.h"
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static char *hdname = NULL;
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#ifndef FLT_EPSILON
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#define FLT_EPSILON 1e-6
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#endif
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/**
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* @brief set_header_name - check ability of witing into file and set given name
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* @param name - header filename
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* @return false if can't write into `name`
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*/
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bool set_header_name(const char *name){
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if(!name) return false;
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int fd;
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if((fd = open(name, O_WRONLY | O_TRUNC | O_CREAT, 0644)) < 0){ // test FITS-header file for writing
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WARN("Can't open %s for writing", name);
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return false;
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}
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close(fd);
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FREE(hdname);
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hdname = strdup(name);
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return true;
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}
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/**
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* @brief printhdr - write FITS record into output file
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* @param fd - fd to write
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* @param key - key
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* @param val - value
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* @param cmnt - comment
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* @return 0 if all OK
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*/
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static int printhdr(int fd, const char *key, const char *val, const char *cmnt){
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char tmp[81];
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char tk[9];
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if(strlen(key) > 8){
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snprintf(tk, 8, "%s", key);
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tk[8] = 0;
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key = tk;
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}
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size_t L = 0;
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if(cmnt){
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L = snprintf(tmp, 81, "%-8s= %-21s / %s", key, val, cmnt);
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}else{
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L = snprintf(tmp, 81, "%-8s= %s", key, val);
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}
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if(L > 80){
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tmp[80] = 0;
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L = 80;
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}
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tmp[L++] = '\n';
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if(write(fd, tmp, L) != (ssize_t)L){
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WARN("write()");
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return 1;
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}
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return 0;
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}
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/**
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* @brief wrhdr - try to write into header file
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*/
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void wrhdr(fitsheader_t *HDR){
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if(!HDR) return;
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static time_t lastcorr = 0; // last time of time/weather corrections sent to mount
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time_t curtime = time(NULL);
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bool haveweather = false;
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bool poweredON = (HDR->status == MNT_S_ERROR || HDR->status == MNT_S_OFF) ? false : true;
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// weather block
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if(HDR->weather.last_update < (int)(1 + MOUNT_CHECK_T * 2)){ // weather data is good
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if(time(NULL) - lastcorr > CORRECTIONS_TIMEDIFF){ // make correction once per hour
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if(mount_corrdata(&HDR->weather)) lastcorr = time(NULL);
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}
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haveweather = true;
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}
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if(!hdname){
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DBG("hdname not given!");
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return;
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}
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char aname[PATH_MAX];
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size_t L = snprintf(aname, PATH_MAX, "%sXXXXXX", hdname);
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if(L == PATH_MAX) aname[PATH_MAX-1] = 0;
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int fd = mkstemp(aname);
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if(fd < 0){
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WARN("Can't write header file: mkstemp()");
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return;
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}
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fchmod(fd, 0644);
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char val[23];
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val[22] = 0;
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#define WRHDR(k, v, c) do{if(printhdr(fd, k, v, c)){goto returning;}}while(0)
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WRHDR("TIMESYS", "'UTC'", "Time system");
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WRHDR("ORIGIN", "'SAO RAS'", "Organization responsible for the data");
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WRHDR("MOUNTNAM", HDR->mountname, "Mount name");
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if(fabs(HDR->dut.px) > FLT_EPSILON){
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snprintf(val, 22, "%.10f", HDR->dut.px);
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WRHDR("POLARX", val, "IERS pole X coordinate, arcsec");
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}
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if(fabs(HDR->dut.py) > FLT_EPSILON){
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snprintf(val, 22, "%.10f", HDR->dut.py);
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WRHDR("POLARY", val, "IERS pole Y coordinate, arcsec");
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}
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if(fabs(HDR->dut.DUT1) > FLT_EPSILON){
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snprintf(val, 22, "%.10f", HDR->dut.DUT1);
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WRHDR("DUT1", val, "IERS `UT1-UTC`, sec");
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}
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polarCrds_t polar;
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horizCrds_t horiz;
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double pt = mount_getInpCoords(&polar), ht = mount_getInpHor(&horiz);
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if(pt > ht){ // horcrds is older -> show polar
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if(curtime - pt < COORDS_OLD_T){
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snprintf(val, 22, "%.10f", RAD2DEG(polar.ra));
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WRHDR("TAGRA", val, "Target RA (J2000), degrees");
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snprintf(val, 22, "%.10f", RAD2DEG(polar.dec));
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WRHDR("TAGDEC", val, "Target DEC (J2000), degrees");
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}
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}else{ // show horiz
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if(curtime - ht < COORDS_OLD_T){
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snprintf(val, 22, "%.10f", RAD2DEG(horiz.az));
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WRHDR("TAGAZ", val, "Target Azimuth, degrees");
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snprintf(val, 22, "%.10f", RAD2DEG(horiz.zd));
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WRHDR("TAGZD", val, "Target Zenith dist., degrees");
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}
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}
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if(poweredON){
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->polar.ra)); // convert RA to degrees
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WRHDR("RA", val, "Telescope right ascension, current epoch, deg");
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->polar.dec));
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WRHDR("DEC", val, "Telescope declination, current epoch, deg");
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->altaz.az));
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WRHDR("AZ", val, "Telescope azimuth, current epoch, deg");
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->altaz.zd));
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WRHDR("ZD", val, "Telescope zenith distance, current epoch, deg");
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}
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WRHDR("TELSTAT", mount_status_str(HDR->status), "Telescope mount status");
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double mjd;
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mount_getInpMJD(&mjd);
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snprintf(val, 22, "%.10f", 2000.+(mjd - ERFA_DJM00)/365.25); // calculate EPOCH/EQUINOX
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WRHDR("INPEQUIN", val, "Equinox of input celestial coordinate system");
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if(poweredON){
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snprintf(val, 22, "%.10f", 2000.+(HDR->MJD.MJD - ERFA_DJM00)/365.25); // telescope coordinates: JNOW
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WRHDR("EQUINOX", val, "Equinox of telescope celestial coordinate sys.");
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snprintf(val, 22, "%.10f", HDR->MJD.MJD);
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WRHDR("MJD", val, "Modified Julian date of file creation");
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if(*HDR->pierside) WRHDR("PIERSIDE", HDR->pierside, "Pier side of telescope mount");
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}
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snprintf(val, 22, "%.1f", HDR->place.salt);
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WRHDR("ELEVAT", val, "Elevation of site over the sea level");
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->place.slong));
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WRHDR("LONGITUD", val, "Geo longitude of site (east negative)");
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snprintf(val, 22, "%.10f", RAD2DEG(HDR->place.slat));
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WRHDR("LATITUDE", val, "Geo latitude of site (south negative)");
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snprintf(val, 22, "%.4f", RAD2HRS(HDR->sidtime));
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WRHDR("LSTEND", val, "Local sidereal time of file creation");
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if(haveweather){
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snprintf(val, 22, "%.1f", HDR->weather.humidity);
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WRHDR("HUMIDITY", val, "Relative humidity, %%");
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snprintf(val, 22, "%.1f", HDR->weather.pressure);
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WRHDR("PRESSURE", val, "Atmospheric pressure, mmHg");
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snprintf(val, 22, "%.1f", HDR->weather.exttemp);
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WRHDR("EXTTEMP", val, "External temperature, degrC");
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snprintf(val, 22, "%d", HDR->weather.rain);
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WRHDR("RAIN", val, "Rain conditions");
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snprintf(val, 22, "%.1f", HDR->weather.clouds);
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WRHDR("SKYQUAL", val, "Sky quality (0 - wery bad, >2500 - good)");
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snprintf(val, 22, "%.1f", HDR->weather.wind);
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WRHDR("WINDSPD", val, "Wind speed (m/s)");
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snprintf(val, 22, "%.1f", HDR->weather.windmax);
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WRHDR("WINDMAX", val, "Last hour maximal wind speed (m/s)");
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snprintf(val, 22, "%zd", HDR->weather.last_update);
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WRHDR("WEATTIME", val, "Unix time of weather measurements");
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}
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// WRHDR("", , "");
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#undef WRHDR
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returning:
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close(fd);
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rename(aname, hdname);
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}
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