/*
*				header.c
*
* Read external ASCII headers.
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
*	This file part of:	SExtractor
*
*	Copyright:		(C) 2010 Emmanuel Bertin -- IAP/CNRS/UPMC
*
*	License:		GNU General Public License
*
*	SExtractor 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 3 of the License, or
*	(at your option) any later version.
*	SExtractor 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 SExtractor. If not, see <http://www.gnu.org/licenses/>.
*
*	Last modified:		07/09/2022
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifdef HAVE_CONFIG_H
#include	"config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "define.h"
#include "globals.h"
#include "fits/fitscat.h"
#include "header.h"
#include "prefs.h"

/****** read_aschead ********************************************************
PROTO	int	read_aschead(char *filename, int frameno, tabstruct *tab)
PURPOSE	Read a ASCII header file and update the current field's tab
INPUT	Name of the ASCII file,
	Frame number (if extensions): 0=first,
	Tab structure.
OUTPUT	RETURN_OK if the file was found, RETURN_ERROR otherwise.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	07/09/2022
 ***/
int     read_aschead(char *filename, int frameno, tabstruct *tab)
  {
   char         keyword[88],data[88],comment[88], str[88];
   FILE         *file;
   h_type       htype;
   t_type       ttype;
   int          i, flag;

  if ((file=fopen(filename, "r")))
    {
/*- Skip previous ENDs in multi-FITS extension headers */
    for (i=frameno-1; i--;)
      while (fgets(str, 88, file)
		&& strncmp(str,"END ",4)
		&& strncmp(str,"END\n",4));
    memset(str, ' ', 80);
    flag = RETURN_ERROR;
    while (fgets(str, 81, file) && strncmp(str,"END ",4)
			&& strncmp(str,"END\n",4))
      {
      if (fitspick(str, keyword, data, &htype, &ttype, comment) != RETURN_OK)
        {
        memset(str, ' ', 80);
        continue;
        }
/*---- Block critical keywords */
      if (!wstrncmp(keyword, "SIMPLE  ", 8)
	||!wstrncmp(keyword, "BITPIX  ", 8)
	||!wstrncmp(keyword, "NAXIS   ", 8)
	||!wstrncmp(keyword, "BSCALE  ", 8)
	||!wstrncmp(keyword, "BZERO   ", 8))
        continue;
      addkeywordto_head(tab, keyword, comment);
      fitswrite(tab->headbuf, keyword, data, htype, ttype);
      memset(str, ' ', 80);
      flag = RETURN_OK;
      }
    fclose(file);
/*-- Update the tab data */
    readbasic_head(tab);
    return flag;
    }
  else
    return RETURN_ERROR;
  }