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hget.c

/*** File libwcs/hget.c
 *** August 30, 2002
 *** By Doug Mink, dmink@cfa.harvard.edu
 *** Harvard-Smithsonian Center for Astrophysics
 *** Copyright (C) 1994-2002
 *** Smithsonian Astrophysical Observatory, Cambridge, MA, USA

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.
    
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Correspondence concerning WCSTools should be addressed as follows:
           Internet email: dmink@cfa.harvard.edu
           Postal address: Doug Mink
                           Smithsonian Astrophysical Observatory
                           60 Garden St.
                           Cambridge, MA 02138 USA

 * Module:  hget.c (Get FITS Header parameter values)
 * Purpose: Extract values for variables from FITS header string
 * Subroutine:    hgeti2 (hstring,keyword,ival) returns short integer
 * Subroutine:    hgeti4c (hstring,keyword,wchar,ival) returns long integer
 * Subroutine:    hgeti4 (hstring,keyword,ival) returns long integer
 * Subroutine:    hgetr4 (hstring,keyword,rval) returns real
 * Subroutine:    hgetra (hstring,keyword,ra) returns double RA in degrees
 * Subroutine:    hgetdec (hstring,keyword,dec) returns double Dec in degrees
 * Subroutine:    hgetr8c (hstring,keyword,wchar,dval) returns double
 * Subroutine:    hgetr8 (hstring,keyword,dval) returns double
 * Subroutine:    hgetl  (hstring,keyword,lval) returns logical int (0=F, 1=T)
 * Subroutine:    hgetsc (hstring,keyword,wchar,lstr,str) returns character string
 * Subroutine:    hgets  (hstring,keyword, lstr, str) returns character string
 * Subroutine:    hgetm  (hstring,keyword, lstr, str) returns multi-keyword string
 * Subroutine:    hgetdate (hstring,keyword,date) returns date as fractional year
 * Subroutine:  hgetndec (hstring, keyword, ndec) returns number of dec. places
 * Subroutine:    hgetc  (hstring,keyword) returns character string
 * Subroutine:    blsearch (hstring,keyword) returns pointer to blank lines
            before keyword
 * Subroutine:    ksearch (hstring,keyword) returns pointer to header string entry
 * Subroutine:    str2ra (in) converts string to right ascension in degrees
 * Subroutine:    str2dec (in) converts string to declination in degrees
 * Subroutine:    strsrch (s1, s2) finds string s2 in null-terminated string s1
 * Subroutine:    strnsrch (s1, s2, ls1) finds string s2 in ls1-byte string s1
 * Subroutine:    hlength (header,lhead) sets length of FITS header for searching
 * Subroutine:  isnum (string) returns 1 if integer, 2 if fp number, else 0
 * Subroutine:  notnum (string) returns 0 if number, else 1
 * Subroutine:  numdec (string) returns number of decimal places in numeric string
 */

#include <string.h>           /* NULL, strlen, strstr, strcpy */
#include <stdio.h>
#include "fitshead.h"   /* FITS header extraction subroutines */
#include <stdlib.h>
#ifndef VMS
#include <limits.h>
#else
#define INT_MAX  2147483647 /* Biggest number that can fit in long */
#define SHRT_MAX 32767
#endif
#define VLENGTH 81

#ifdef USE_SAOLIB
static int use_saolib=0;
#endif

char *hgetc ();

static char val[VLENGTH+1];
static int multiline = 0;

static int lhead0 = 0;  /* Length of header string */

/* Set the length of the header string, if not terminated by NULL */
int
hlength (header, lhead)
char  *header; /* FITS header */
int   lhead;      /* Maximum length of FITS header */
{
    char *hend;
    lhead0 = lhead;
    if (lhead < 1) {
      hend = ksearch (header,"END");
      lhead0 = hend + 80 - header;
      }
    return (lhead0);
}

/* Return the length of the header string, computing it if lhead0 not set */
int
gethlength (header)
char  *header; /* FITS header */
{
    if (lhead0 > 0)
      return (lhead0);
    else
      return (hlength (header, 0));
}


/* Extract Integer*4 value for variable from FITS header string */

int
hgeti4c (hstring,keyword,wchar,ival)

char  *hstring;   /* character string containing FITS header information
                     in the format <keyword>= <value> {/ <comment>} */
char  *keyword;   /* character string containing the name of the keyword
                     the value of which is returned.  hget searches for
                     a line beginning with this string.  if "[n]" is
                     present, the n'th token in the value is returned.
                     (the first 8 characters must be unique) */
unsigned char wchar;    /* Character of multiple WCS header; =0 if unused */
int   *ival;            /* Keyword value returned */
{
    char keyword1[16];
    int lkey;

    if (wchar < 64)
      return (hgeti4 (hstring, keyword, ival));
    else {
      strcpy (keyword1, keyword);
      lkey = strlen (keyword);
      keyword1[lkey] = wchar;
      keyword1[lkey+1] = (char) 0;
      return (hgeti4 (hstring, keyword1, ival));
      }
}


/* Extract long value for variable from FITS header string */

int
hgeti4 (hstring,keyword,ival)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
int *ival;
{
    char *value;
    double dval;
    int minint;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII to binary */
    if (value != NULL) {
      if (value[0] == '#') value++;
      minint = -INT_MAX - 1;
      lval = strlen (value);
      if (lval > VLENGTH) {
          strncpy (val, value, VLENGTH);
          val[VLENGTH] = (char) 0;
          }
      else
          strcpy (val, value);
      dval = atof (val);
      if (dval+0.001 > INT_MAX)
          *ival = INT_MAX;
      else if (dval >= 0)
          *ival = (int) (dval + 0.001);
      else if (dval-0.001 < minint)
          *ival = minint;
      else
          *ival = (int) (dval - 0.001);
      return (1);
      }
    else {
      return (0);
      }
}


/* Extract integer*2 value for variable from fits header string */

int
hgeti2 (hstring,keyword,ival)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
short *ival;
{
    char *value;
    double dval;
    int minshort;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII to binary */
    if (value != NULL) {
      if (value[0] == '#') value++;
      lval = strlen (value);
      if (lval > VLENGTH) {
          strncpy (val, value, VLENGTH);
          val[VLENGTH] = (char) 0;
          }
      else
          strcpy (val, value);
      dval = atof (val);
      minshort = -SHRT_MAX - 1;
      if (dval+0.001 > SHRT_MAX)
          *ival = SHRT_MAX;
      else if (dval >= 0)
          *ival = (short) (dval + 0.001);
      else if (dval-0.001 < minshort)
          *ival = minshort;
      else
          *ival = (short) (dval - 0.001);
      return (1);
      }
    else {
      return (0);
      }
}

/* Extract real value for variable from FITS header string */

int
hgetr4 (hstring,keyword,rval)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
float *rval;
{
    char *value;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* translate value from ASCII to binary */
    if (value != NULL) {
      if (value[0] == '#') value++;
      lval = strlen (value);
      if (lval > VLENGTH) {
          strncpy (val, value, VLENGTH);
          val[VLENGTH] = (char) 0;
          }
      else
          strcpy (val, value);
      *rval = (float) atof (val);
      return (1);
      }
    else {
      return (0);
      }
}


/* Extract real*8 right ascension in degrees from FITS header string */

int
hgetra (hstring,keyword,dval)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
double *dval;     /* Right ascension in degrees (returned) */
{
    char *value;

    /* Get value from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII colon-delimited string to binary */
    if (value != NULL) {
      *dval = str2ra (value);
      return (1);
      }
    else
      return (0);
}


/* Extract real*8 declination in degrees from FITS header string */

int
hgetdec (hstring,keyword,dval)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
double *dval;     /* Right ascension in degrees (returned) */
{
    char *value;

    /* Get value from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII colon-delimited string to binary */
    if (value != NULL) {
      *dval = str2dec (value);
      return (1);
      }
    else
      return (0);
}


/* Extract real*8 value for variable from FITS header string */

int
hgetr8c (hstring,keyword,wchar,dval)

char  *hstring;   /* character string containing FITS header information
                     in the format <keyword>= <value> {/ <comment>} */
char  *keyword;   /* character string containing the name of the keyword
                     the value of which is returned.  hget searches for
                     a line beginning with this string.  if "[n]" is
                     present, the n'th token in the value is returned.
                     (the first 8 characters must be unique) */
unsigned char wchar;    /* Character of multiple WCS header; =0 if unused */
double      *dval;            /* Keyword value returned */
{
    char keyword1[16];
    int lkey;

    if (wchar < 64)
      return (hgetr8 (hstring, keyword, dval));
    else {
      strcpy (keyword1, keyword);
      lkey = strlen (keyword);
      keyword1[lkey] = wchar;
      keyword1[lkey+1] = (char) 0;
      return (hgetr8 (hstring, keyword1, dval));
      }
}



/* Extract real*8 value for variable from FITS header string */

int
hgetr8 (hstring,keyword,dval)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
double *dval;
{
    char *value;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII to binary */
    if (value != NULL) {
      if (value[0] == '#') value++;
      lval = strlen (value);
      if (lval > VLENGTH) {
          strncpy (val, value, VLENGTH);
          val[VLENGTH] = (char) 0;
          }
      else
          strcpy (val, value);
      *dval = atof (val);
      return (1);
      }
    else {
      return (0);
      }
}


/* Extract logical value for variable from FITS header string */

int
hgetl (hstring,keyword,ival)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
int *ival;
{
    char *value;
    char newval;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII to binary */
    if (value != NULL) {
      lval = strlen (value);
      if (lval > VLENGTH) {
          strncpy (val, value, VLENGTH);
          val[VLENGTH] = (char) 0;
          }
      else
          strcpy (val, value);
        newval = val[0];
      if (newval == 't' || newval == 'T')
          *ival = 1;
      else
          *ival = 0;
      return (1);
      }
    else {
      return (0);
      }
}


/* Extract real*8 date from FITS header string (dd/mm/yy or dd-mm-yy) */

int
hgetdate (hstring,keyword,dval)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
double *dval;
{
    double yeardays, seconds, fday;
    char *value,*sstr, *dstr, *tstr, *cstr, *nval;
    int year, month, day, yday, i, hours, minutes;
    static int mday[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Translate value from ASCII to binary */
    if (value != NULL) {
      sstr = strchr (value,'/');
      dstr = strchr (value,'-');

      /* Original FITS date format: dd/mm/yy */
      if (sstr > value) {
          *sstr = '\0';
          day = (int) atof (value);
          *sstr = '/';
          nval = sstr + 1;
          sstr = strchr (nval,'/');
          if (sstr == NULL)
            sstr = strchr (nval,'-');
          if (sstr > value) {
            *sstr = '\0';
            month = (int) atof (nval);
            *sstr = '/';
            nval = sstr + 1;
            year = (int) atof (nval);
            if (day > 31) {
                yday = year;
                year = day;
                day = yday;
                }
            if (year >= 0 && year <= 49)
                year = year + 2000;
            else if (year < 100)
                year = year + 1900;
            if ((year % 4) == 0)
                mday[1] = 29;
            else
                mday[1] = 28;
            if ((year % 100) == 0 && (year % 400) != 0)
                mday[1] = 28;
            if (day > mday[month-1])
                day = mday[month-1];
            else if (day < 1)
                day = 1;
            if (mday[1] == 28)
                yeardays = 365.0;
            else
                yeardays = 366.0;
            yday = day - 1;
            for (i = 0; i < month-1; i++)
                yday = yday + mday[i];
            *dval = (double) year + ((double)yday / yeardays);
            return (1);
            }
          else
            return (0);
          }

      /* New FITS date format: yyyy-mm-ddThh:mm:ss[.sss] */
      else if (dstr > value) {
          *dstr = '\0';
          year = (int) atof (value);
          *dstr = '-';
          nval = dstr + 1;
          dstr = strchr (nval,'-');
          month = 1;
          day = 1;
          tstr = NULL;
          if (dstr > value) {
            *dstr = '\0';
            month = (int) atof (nval);
            *dstr = '-';
            nval = dstr + 1;
            tstr = strchr (nval,'T');
            if (tstr > value)
                *tstr = '\0';
            day = (int) atof (nval);
            if (tstr > value)
                *tstr = 'T';
            }

          /* If year is < 32, it is really day of month in old format */
          if (year < 32) {
            i = year;
            year = day + 1900;
            day = i;
            }

          if ((year % 4) == 0)
            mday[1] = 29;
          else
            mday[1] = 28;
          if ((year % 100) == 0 && (year % 400) != 0)
            mday[1] = 28;
          if (day > mday[month-1])
            day = mday[month-1];
          else if (day < 1)
            day = 1;
          if (mday[1] == 28)
            yeardays = 365.0;
          else
            yeardays = 366.0;
          yday = day - 1;
          for (i = 0; i < month-1; i++)
            yday = yday + mday[i];
          *dval = (double) year + ((double)yday / yeardays);

          /* Extract time, if it is present */
          if (tstr > value) {
            nval = tstr + 1;
            hours = 0.0;
            minutes = 0.0;
            seconds = 0.0;
            cstr = strchr (nval,':');
            if (cstr > value) {
                *cstr = '\0';
                hours = (int) atof (nval);
                *cstr = ':';
                nval = cstr + 1;
                cstr = strchr (nval,':');
                if (cstr > value) {
                  *cstr = '\0';
                  minutes = (int) atof (nval);
                  *cstr = ':';
                  nval = cstr + 1;
                  seconds = atof (nval);
                  }
                else {
                  minutes = (int) atof (nval);
                  seconds = 0.0;
                  }
                }
            fday = ((3.6e3 * (double)hours) + (6.e1 * (double)minutes) +
                   seconds) / 8.64e4;
            *dval = *dval + (fday / yeardays);
            }
          return (1);
          }
      else
          return (0);
      }
    else
      return (0);
}


/* Extract IRAF multiple-keyword string value from FITS header string */

int
hgetm (hstring, keyword, lstr, str)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the root name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
int lstr;   /* Size of str in characters */
char *str;  /* String (returned) */
{
    char *value;
    char *stri;
    char keywordi[16];
    int lval, lstri, ikey;
    char keyform[8];

    stri = str;
    lstri = lstr;

    sprintf (keywordi, "%s_1", keyword);
    if (ksearch (hstring, keywordi))
      strcpy (keyform, "%s_%d");
    else {
      sprintf (keywordi, "%s_01", keyword);
      if (ksearch (hstring, keywordi))
          strcpy (keyform, "%s_%02d");
      else {
          sprintf (keywordi, "%s_001", keyword);
          if (ksearch (hstring, keywordi))
            strcpy (keyform, "%s_%03d");
          else
            return (0);
          }
      }

    /* Loop through sequentially-named keywords */
    multiline = 1;
    for (ikey = 1; ikey < 20; ikey++) {
      sprintf (keywordi, keyform, keyword, ikey);

      /* Get value for this keyword */
      value = hgetc (hstring, keywordi);
      if (value != NULL) {
          lval = strlen (value);
          if (lval < lstri)
            strcpy (stri, value);
          else if (lstri > 1) {
            strncpy (stri, value, lstri-1);
            stri[lstri] = (char) 0;
            break;
            }
          else {
            str[0] = value[0];
            break;
            }
          }
      else
          break;
      stri = stri + lval;
      lstri = lstri - lval;
      }
    multiline = 0;

    /* Return 1 if any keyword found, else 0 */
    if (ikey > 1)
      return (1);
    else
      return (0);
}


/* Extract string value for variable from FITS header string */

int
hgetsc (hstring,keyword,wchar,lstr,str)

char  *hstring;   /* character string containing FITS header information
                     in the format <keyword>= <value> {/ <comment>} */
char  *keyword;   /* character string containing the name of the keyword
                     the value of which is returned.  hget searches for
                     a line beginning with this string.  if "[n]" is
                     present, the n'th token in the value is returned.
                     (the first 8 characters must be unique) */
unsigned char wchar;    /* Character of multiple WCS header; =0 if unused */
int   lstr;       /* Size of str in characters */
char  *str;       /* String (returned) */
{
    char keyword1[16];
    int lkey;

    if (wchar < 64)
      return (hgets (hstring, keyword, lstr, str));
    else {
      strcpy (keyword1, keyword);
      lkey = strlen (keyword);
      keyword1[lkey] = wchar;
      keyword1[lkey+1] = (char) 0;
      return (hgets (hstring, keyword1, lstr, str));
      }
}


/* Extract string value for variable from FITS header string */

int
hgets (hstring, keyword, lstr, str)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
int lstr;   /* Size of str in characters */
char *str;  /* String (returned) */
{
    char *value;
    int lval;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    if (value != NULL) {
      lval = strlen (value);
      if (lval < lstr)
          strcpy (str, value);
      else if (lstr > 1)
          strncpy (str, value, lstr-1);
      else
          str[0] = value[0];
      return (1);
      }
    else
      return (0);
}


/* Extract number of decimal places for value in FITS header string */

int
hgetndec (hstring, keyword, ndec)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword;    /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
int *ndec;  /* Number of decimal places in keyword value */
{
    char *value;
    int i, nchar;

    /* Get value and comment from header string */
    value = hgetc (hstring,keyword);

    /* Find end of string and count backward to decimal point */
    *ndec = 0;
    if (value != NULL) {
      nchar = strlen (value);
      for (i = nchar-1; i >= 0; i--) {
          if (value[i] == '.')
            return (1);
          *ndec = *ndec + 1;
          }
      return (1);
      }
    else
      return (0);
}


/* Extract character value for variable from FITS header string */

char *
hgetc (hstring,keyword0)

char *hstring;    /* character string containing FITS header information
               in the format <keyword>= <value> {/ <comment>} */
char *keyword0;   /* character string containing the name of the keyword
               the value of which is returned.  hget searches for a
               line beginning with this string.  if "[n]" is present,
               the n'th token in the value is returned.
               (the first 8 characters must be unique) */
{
    static char cval[80];
    char *value;
    char cwhite[2];
    char squot[2], dquot[2], lbracket[2], rbracket[2], slash[2], comma[2];
    char keyword[81]; /* large for ESO hierarchical keywords */
    char line[100];
    char *vpos, *cpar;
    char *q1, *q2, *v1, *v2, *c1, *brack1, *brack2;
    int ipar, i;

#ifdef USE_SAOLIB
    int iel=1, ip=1, nel, np, ier;
    char *get_fits_head_str();

    if( !use_saolib ){
#endif

    squot[0] = (char) 39;
    squot[1] = (char) 0;
    dquot[0] = (char) 34;
    dquot[1] = (char) 0;
    lbracket[0] = (char) 91;
    lbracket[1] = (char) 0;
    comma[0] = (char) 44;
    comma[1] = (char) 0;
    rbracket[0] = (char) 93;
    rbracket[1] = (char) 0;
    slash[0] = (char) 47;
    slash[1] = (char) 0;

    /* Find length of variable name */
    strncpy (keyword,keyword0, sizeof(keyword)-1);
    brack1 = strsrch (keyword,lbracket);
    if (brack1 == NULL)
      brack1 = strsrch (keyword,comma);
    if (brack1 != NULL) {
      *brack1 = '\0';
      brack1++;
      }

    /* Search header string for variable name */
    vpos = ksearch (hstring,keyword);

    /* Exit if not found */
    if (vpos == NULL) {
      return (NULL);
      }

    /* Initialize line to nulls */
    for (i = 0; i < 100; i++)
      line[i] = 0;

/* In standard FITS, data lasts until 80th character */

    /* Extract entry for this variable from the header */
    strncpy (line,vpos,80);

    /* Check for quoted value */
    q1 = strsrch (line,squot);
    c1 = strsrch (line,slash);
    if (q1 != NULL) {
      if (c1 != NULL && q1 < c1)
          q2 = strsrch (q1+1,squot);
      else if (c1 == NULL)
          q2 = strsrch (q1+1,squot);
      else
          q1 = NULL;
      }
    else {
      q1 = strsrch (line,dquot);
      if (q1 != NULL) {
          if (c1 != NULL && q1 < c1)
            q2 = strsrch (q1+1,dquot);
          else if (c1 == NULL)
            q2 = strsrch (q1+1,dquot);
          else
            q1 = NULL;
          }
      else {
          q1 = NULL;
          q2 = line + 10;
          }
      }

    /* Extract value and remove excess spaces */
    if (q1 != NULL) {
      v1 = q1 + 1;;
      if (q2 != NULL) {
          v2 = q2;
          c1 = strsrch (q2,"/");
          }
      else {
          c1 = strsrch (line,"/");
          if (c1 != NULL)
            v2 = c1;
          else
            v2 = line + 79;
          }
      }
    else {
      v1 = strsrch (line,"=");
      if (v1 == NULL)
          v1 = line + 9;
      else
          v1 = v1 + 1;
      c1 = strsrch (line,"/");
      if (c1 != NULL)
          v2 = c1;
      else
          v2 = line + 79;
      }

    /* Ignore leading spaces if not multiline */
    if (!multiline) {
      while (*v1 == ' ' && v1 < v2) {
          v1++;
          }
      }

    /* Drop trailing spaces */
    *v2 = '\0';
    if (!multiline) {
      v2--;
      while ((*v2 == ' ' || *v2 == (char) 13) && v2 > v1) {
          *v2 = '\0';
          v2--;
          }
      }

    /* Convert -zero to just plain 0 */
    if (!strcmp (v1, "-0"))
      v1++;
    strcpy (cval,v1);
    value = cval;

    /* If keyword has brackets, extract appropriate token from value */
    if (brack1 != NULL) {
      brack2 = strsrch (brack1,rbracket);
      if (brack2 != NULL)
          *brack2 = '\0';
      ipar = atoi (brack1);
      cwhite[0] = ' ';
      cwhite[1] = '\0';
      if (ipar > 0) {
          for (i = 1; i <= ipar; i++) {
            cpar = strtok (v1,cwhite);
            v1 = NULL;
            }
          if (cpar != NULL) {
            strcpy (cval,cpar);
            value = cval;
            }
          else
            value = NULL;
          }

      /* If token counter is negative, include rest of value from token on */
      else if (ipar < 0) {
          for (i = 1; i < -ipar; i++) {
            v1 = strchr (v1, ' ');
            if (v1 == NULL)
                break;
            else
                v1 = v1 + 1;
            }
          if (v1 != NULL) {
            strcpy (cval, v1);
            value = cval;
            }
          else
            value = NULL;
          }
      }

    return (value);
#ifdef USE_SAOLIB
    } else {
      return(get_fits_head_str(keyword0, iel, ip, &nel, &np, &ier, hstring));
    }
#endif
}


/* Find beginning of fillable blank line before FITS header keyword line */

char *
blsearch (hstring,keyword)

/* Find entry for keyword keyword in FITS header string hstring.
   (the keyword may have a maximum of eight letters)
   NULL is returned if the keyword is not found */

char *hstring;    /* character string containing fits-style header
            information in the format <keyword>= <value> {/ <comment>}
            the default is that each entry is 80 characters long;
            however, lines may be of arbitrary length terminated by
            nulls, carriage returns or linefeeds, if packed is true.  */
char *keyword;    /* character string containing the name of the variable
            to be returned.  ksearch searches for a line beginning
            with this string.  The string may be a character
            literal or a character variable terminated by a null
            or '$'.  it is truncated to 8 characters. */
{
    char *loc, *headnext, *headlast, *pval, *lc, *line;
    char *bval;
    int icol, nextchar, lkey, nleft, lhstr;

    pval = 0;

    /* Search header string for variable name */
    if (lhead0)
      lhstr = lhead0;
    else {
      lhstr = 0;
      while (lhstr < 256000 && hstring[lhstr] != 0)
          lhstr++;
      }
    headlast = hstring + lhstr;
    headnext = hstring;
    pval = NULL;
    while (headnext < headlast) {
      nleft = headlast - headnext;
      loc = strnsrch (headnext, keyword, nleft);

      /* Exit if keyword is not found */
      if (loc == NULL) {
          break;
          }

      icol = (loc - hstring) % 80;
      lkey = strlen (keyword);
      nextchar = (int) *(loc + lkey);

      /* If this is not in the first 8 characters of a line, keep searching */
      if (icol > 7)
          headnext = loc + 1;

      /* If parameter name in header is longer, keep searching */
      else if (nextchar != 61 && nextchar > 32 && nextchar < 127)
          headnext = loc + 1;

      /* If preceeding characters in line are not blanks, keep searching */
      else {
          line = loc - icol;
          for (lc = line; lc < loc; lc++) {
            if (*lc != ' ')
                headnext = loc + 1;
            }

      /* Return pointer to start of line if match */
          if (loc >= headnext) {
            pval = line;
            break;
            }
          }
      }

    /* Return NULL to calling program if keyword is not found */
    if (pval == NULL)
      return (pval);

    /* Return NULL if keyword is found at start of FITS header string */
    if (pval == hstring)
      return (NULL);

    /* Find last nonblank in FITS header string line before requested keyword */
    bval = pval - 80;
    while (!strncmp (bval,"        ",8) && bval >= hstring)
      bval = bval - 80;
    bval = bval + 80;

    /* Return pointer to calling program if blank lines found */
    if (bval < pval && bval >= hstring)
      return (bval);
    else
      return (NULL);
}


/* Find FITS header line containing specified keyword */

char *
ksearch (hstring,keyword)

/* Find entry for keyword keyword in FITS header string hstring.
   (the keyword may have a maximum of eight letters)
   NULL is returned if the keyword is not found */

char *hstring;    /* character string containing fits-style header
            information in the format <keyword>= <value> {/ <comment>}
            the default is that each entry is 80 characters long;
            however, lines may be of arbitrary length terminated by
            nulls, carriage returns or linefeeds, if packed is true.  */
char *keyword;    /* character string containing the name of the variable
            to be returned.  ksearch searches for a line beginning
            with this string.  The string may be a character
            literal or a character variable terminated by a null
            or '$'.  it is truncated to 8 characters. */
{
    char *loc, *headnext, *headlast, *pval, *lc, *line;
    int icol, nextchar, lkey, nleft, lhead, lmax;

#ifdef USE_SAOLIB
      int iel=1, ip=1, nel, np, ier;
      char *get_fits_head_str();

      if( !use_saolib ){
#endif

    pval = 0;

/* Find current length of header string */
    if (lhead0)
      lmax = lhead0;
    else
      lmax = 256000;
    for (lhead = 0; lhead < lmax; lhead++) {
      if (hstring[lhead] == (char) 0)
          break;
      }

/* Search header string for variable name */
    headlast = hstring + lhead;
    headnext = hstring;
    pval = NULL;
    while (headnext < headlast) {
      nleft = headlast - headnext;
      loc = strnsrch (headnext, keyword, nleft);

      /* Exit if keyword is not found */
      if (loc == NULL) {
          break;
          }

      icol = (loc - hstring) % 80;
      lkey = strlen (keyword);
      nextchar = (int) *(loc + lkey);

      /* If this is not in the first 8 characters of a line, keep searching */
      if (icol > 7)
          headnext = loc + 1;

      /* If parameter name in header is longer, keep searching */
      else if (nextchar != 61 && nextchar > 32 && nextchar < 127)
          headnext = loc + 1;

      /* If preceeding characters in line are not blanks, keep searching */
      else {
          line = loc - icol;
          for (lc = line; lc < loc; lc++) {
            if (*lc != ' ')
                headnext = loc + 1;
            }

      /* Return pointer to start of line if match */
          if (loc >= headnext) {
            pval = line;
            break;
            }
          }
      }

/* Return pointer to calling program */
      return (pval);

#ifdef USE_SAOLIB
      }
      else {
          if (get_fits_head_str(keyword,iel,ip,&nel,&np,&ier,hstring) != NULL)
            return(hstring);
          else
            return(NULL);
          }
#endif
}


/* Return the right ascension in degrees from sexagesimal hours or decimal degrees */

double
str2ra (in)

char  *in;  /* Character string of sexigesimal hours or decimal degrees */

{
    double ra;    /* Right ascension in degrees (returned) */

    ra = str2dec (in);
    if (strsrch (in,":"))
      ra = ra * 15.0;

    return (ra);
}


/* Return the declination in degrees from sexagesimal or decimal degrees */

double
str2dec (in)

char  *in;  /* Character string of sexigesimal or decimal degrees */

{
    double dec;         /* Declination in degrees (returned) */
    double deg, min, sec, sign;
    char *value, *c1, *c2;
    int lval;

    dec = 0.0;

    /* Return 0.0 if string is null */
    if (in == NULL)
      return (dec);

    /* Translate value from ASCII colon-delimited string to binary */
    if (in[0]) {
      value = in;

      /* Remove leading spaces */
      while (*value == ' ')
          value++;

      /* Save sign */
      if (*value == '-') {
          sign = -1.0;
          value++;
          }
      else if (*value == '+') {
          sign = 1.0;
          value++;
          }
      else
          sign = 1.0;

      /* Remove trailing spaces */
      lval = strlen (value);
      while (value[lval-1] == ' ')
          lval--;
      
      if ((c1 = strsrch (value,":")) == NULL)
          c1 = strnsrch (value," ",lval);
      if (c1 != NULL) {
          *c1 = 0;
          deg = (double) atoi (value);
          *c1 = ':';
          value = c1 + 1;
          if ((c2 = strsrch (value,":")) == NULL)
            c2 = strsrch (value," ");
          if (c2 != NULL) {
            *c2 = 0;
            min = (double) atoi (value);
            *c2 = ':';
            value = c2 + 1;
            sec = atof (value);
            }
          else {
            sec = 0.0;
            if ((c1 = strsrch (value,".")) != NULL)
                min = atof (value);
            if (strlen (value) > 0)
                min = (double) atoi (value);
            }
          dec = sign * (deg + (min / 60.0) + (sec / 3600.0));
          }
      else if ((c1 = strsrch (value,".")) != NULL)
          dec = sign * atof (value);
      else 
          dec = sign * (double) atoi (value);
      }
    return (dec);
}


/* Find string s2 within null-terminated string s1 */

char *
strsrch (s1, s2)

char *s1;   /* String to search */
char *s2;   /* String to look for */

{
    int ls1;
    ls1 = strlen (s1);
    return (strnsrch (s1, s2, ls1));
}


/* Find string s2 within string s1 */

char *
strnsrch (s1, s2, ls1)

char  *s1;  /* String to search */
char  *s2;  /* String to look for */
int   ls1;  /* Length of string being searched */

{
    char *s,*s1e;
    char cfirst,clast;
    int i,ls2;

    /* Return null string if either pointer is NULL */
    if (s1 == NULL || s2 == NULL)
      return (NULL);

    /* A zero-length pattern is found in any string */
    ls2 = strlen (s2);
    if (ls2 ==0)
      return (s1);

    /* Only a zero-length string can be found in a zero-length string */
    if (ls1 ==0)
      return (NULL);

    cfirst = s2[0];
    clast = s2[ls2-1];
    s1e = s1 + ls1 - ls2 + 1;
    s = s1;
    while (s < s1e) { 

      /* Search for first character in pattern string */
      if (*s == cfirst) {

          /* If single character search, return */
          if (ls2 == 1)
            return (s);

          /* Search for last character in pattern string if first found */
          if (s[ls2-1] == clast) {

            /* If two-character search, return */
            if (ls2 == 2)
                return (s);

            /* If 3 or more characters, check for rest of search string */
            i = 1;
            while (i < ls2 && s[i] == s2[i])
                i++;

            /* If entire string matches, return */
            if (i >= ls2)
                return (s);
            }
          }
      s++;
      }
    return (NULL);
}


/* Find string s2 within null-terminated string s1 (case-free search) */

char *
strcsrch (s1, s2)

char *s1;   /* String to search */
char *s2;   /* String to look for */

{
    int ls1;
    ls1 = strlen (s1);
    return (strncsrch (s1, s2, ls1));
}


/* Find string s2 within string s1 (case-free search) */

char *
strncsrch (s1, s2, ls1)

char  *s1;  /* String to search */
char  *s2;  /* String to look for */
int   ls1;  /* Length of string being searched */

{
    char *s,*s1e, sl, *os2;
    char cfirst,clast,ocfirst,oclast;
    int i,ls2;

    /* Return null string if either pointer is NULL */
    if (s1 == NULL || s2 == NULL)
      return (NULL);

    /* A zero-length pattern is found in any string */
    ls2 = strlen (s2);
    if (ls2 ==0)
      return (s1);

    /* Only a zero-length string can be found in a zero-length string */
    if (ls1 ==0)
      return (NULL);

    /* For one or two characters, set opposite case first and last letters */
    if (ls2 < 3) {
      cfirst = s2[0];
      if (cfirst > 96 && cfirst < 123)
          ocfirst = cfirst - 32;
      else if (cfirst > 64 && cfirst < 91)
          ocfirst = cfirst + 32;
      else
          ocfirst = cfirst;
      if (ls2 > 1) {
          clast = s2[1];
          if (clast > 96 && clast < 123)
            oclast = clast - 32;
          else if (clast > 64 && clast < 91)
            oclast = clast + 32;
          else
            oclast = clast;
          }
      }

    /* Else duplicate string with opposite case letters for comparison */
    else {
      os2 = (char *) calloc (ls2, 1);
      for (i = 0; i < ls2; i++) {
          if (s2[i] > 96 && s2[i] < 123)
            os2[i] = s2[i] - 32;
          else if (s2[i] > 64 && s2[i] < 91)
            os2[i] = s2[i] + 32;
          else
            os2[i] = s2[i];
          }
      cfirst = s2[0];
      ocfirst = os2[0];
      clast = s2[ls2-1];
      oclast = os2[ls2-1];
      }

    /* Loop through input string, character by character */
    s1e = s1 + ls1 - ls2 + 1;
    s = s1;
    while (s < s1e) { 

      /* Search for first character in pattern string */
      if (*s == cfirst || *s == ocfirst) {

          /* If single character search, return */
          if (ls2 == 1)
            return (s);

          /* Search for last character in pattern string if first found */
          sl = s[ls2-1];
          if (sl == clast || sl == oclast) {

            /* If two-character search, return */
            if (ls2 == 2)
                return (s);

            /* If 3 or more characters, check for rest of search string */
            i = 1;
            while (i < ls2 && (s[i] == s2[i] || s[i] == os2[i]))
                i++;

            /* If entire string matches, return */
            if (i >= ls2) {
                free (os2);
                return (s);
                }
            }
          }
      s++;
      }
    free (os2);
    return (NULL);
}


int
notnum (string)

char *string;     /* Character string */
{
    if (isnum (string))
      return (0);
    else
      return (1);
}


/* ISNUM-- Return 1 if string is an integer number, 2 if floating point, else 0
 */

int
isnum (string)

char *string;     /* Character string */
{
    int lstr, i, nd;
    char cstr, cstr1;
    int fpcode;

    /* Return 0 if string is NULL */
    if (string == NULL)
      return (0);

    lstr = strlen (string);
    nd = 0;
    fpcode = 1;

    /* Return 0 if string starts with a D or E */
    cstr = string[0];
    if (cstr == 'D' || cstr == 'd' ||
      cstr == 'E' || cstr == 'e') {
      return (0);
      }

    /* Remove trailing spaces */
    while (string[lstr-1] == ' ')
      lstr--;

    /* Numeric strings contain 0123456789-+ and d or e for exponents */
    for (i = 0; i < lstr; i++) {
      cstr = string[i];
      if (cstr == '\n')
          break;

      /* Ignore leading spaces */
      if (cstr == ' ' && nd == 0)
          continue;

      if ((cstr < 48 || cstr > 57) &&
          cstr != '+' && cstr != '-' &&
          cstr != 'D' && cstr != 'd' &&
          cstr != 'E' && cstr != 'e' &&
          cstr != '.')
          return (0);
      else if (cstr == '+' || cstr == '-') {
          if (string[i+1] == '-' || string[i+1] == '+')
            return (0);
          else if (i > 0) {
            cstr1 = string[i-1];
            if (cstr1 != 'D' && cstr1 != 'd' &&
                cstr1 != 'E' && cstr1 != 'e' &&
                cstr1 != ' ')
                return (0);
            }
          }
      else if (cstr >= 47 && cstr <= 57)
          nd++;
      if (cstr=='.' || cstr=='d' || cstr=='e' || cstr=='d' || cstr=='e')
          fpcode = 2;
      }
    if (nd > 0)
      return (fpcode);
    else
      return (0);
}


/* NUMDEC -- Return number of decimal places in numeric string (-1 if not number) */

int
numdec (string)

char *string;   /* Numeric string */
{
    char *cdot;
    int lstr;

    if (notnum (string))
        return (-1);
    else {
        lstr = strlen (string);
        if ((cdot = strchr (string, '.')) == NULL)
            return (0);
        else
            return (lstr - (cdot - string));
        }
}


#ifdef USE_SAOLIB
int set_saolib(hstring)
    void *hstring;
{
    if( *((int *)hstring) == 142857 )
      use_saolib = 1;
    else
      use_saolib = 0;
}

#endif

/* Oct 28 1994    New program
 *
 * Mar  1 1995    Search for / after second quote, not first one
 * May  2 1995    Initialize line in HGETC; deal with logicals in HGETL better
 * May  4 1995    Declare STRSRCH in KSEARCH
 * Aug  7 1995  Fix line initialization in HGETC
 * Dec 22 1995    Add HGETRA and HGETDEC to get degrees from xx:xx:xx.xxx string
 *
 * Jan 26 1996    Fix HGETL to not crash when parameter is not present
 * Feb  1 1996    Fix HGETC to deal with quotes correctly
 * Feb  1 1996    Fix HGETDEG to deal with sign correctly
 * Feb  6 1996    Add HGETS to update character strings
 * Feb  8 1996    Fix STRSRCH to find final characters in string
 * Feb 23 1996    Add string to degree conversions
 * Apr 26 1996    Add HGETDATE to get fractional year from date string
 * May 22 1996    Fix documentation; return double from STR2RA and STR2DEC
 * May 28 1996    Fix string translation of RA and Dec when no seconds
 * Jun 10 1996    Remove unused variables after running lint
 * Jun 17 1996    Fix bug which failed to return single character strings
 * Jul  1 1996    Skip sign when reading declination after testing for it
 * Jul 19 1996    Do not divide by 15 if RA header value is already in degrees
 * Aug  5 1996    Add STRNSRCH to search strings which are not null-terminated
 * Aug  6 1996    Make minor changes after lint
 * Aug  8 1996    Fix ksearch bug which finds wrong keywords
 * Aug 13 1996    Fix sign bug in STR2DEC for degrees
 * Aug 26 1996    Drop unused variables ICOL0, NLINE, PREVCHAR from KSEARCH
 * Sep 10 1996    Fix header length setting code
 * Oct 15 1996    Clean up loops and fix ICOL assignment
 * Nov 13 1996    Handle integer degrees correctly in STR2DEC
 * Nov 21 1996    Make changes for Linux thanks to Sidik Isani
 * Dec 12 1996    Add ISNUM to check to see whether strings are numbers
 *
 * Jan 22 1997    Add ifdefs for Eric Mandel (SAOtng)
 * Jan 27 1997    Convert to integer through ATOF so exponents are recognized
 * Jul 25 1997    Implement FITS version of ISO date format
 * 
 * Feb 24 1998    Implement code to return IRAF multiple-keyword strings
 * Mar 12 1998    Add subroutine NOTNUM
 * Mar 27 1998    Add changes to match SKYCAT version
 * Apr 30 1998    Add BLSEARCH() to find blank lines before END
 * May 27 1998    Add HGETNDEC() to get number of decimal places in entry
 * Jun  1 1998    Add VMS patch from Harry Payne at StSci
 * Jun 18 1998    Fix code which extracts tokens from string values
 * Jul 21 1998    Drop minus sign for values of -0
 * Sep 29 1998    Treat hyphen-separated date as old format if 2-digit year
 * Oct  7 1998    Clean up search for last blank line
 *
 * Apr  5 1999    Check lengths of strings before copying them
 * May  5 1999    values.h -> POSIX limits.h: MAXINT->INT_MAX, MAXSHORT->SHRT_MAX
 * Jul 15 1999    Add hgetm() options of 1- or 2-digit keyword extensions
 * Oct  6 1999    Add gethlength() to return header length
 * Oct 14 1999    In ksearch(), search only to null not to end of buffer
 * Oct 15 1999    Return 1 from hgetndec() if successful
 * Oct 20 1999    Drop unused variable after lint (val in hgetndec)
 * Dec  3 1999    Fix isnum() to reject strings starting with a d or e
 * Dec 20 1999    Update hgetdate() to get minutes and seconds right
 *
 * Feb 10 2000    Parse RA and Dec with spaces as well as colons as separators
 * Feb 11 2000    Add null at end of multi-line keyword value character string
 * Feb 25 2000    Change max search string length from 57600 to 256000
 * Mar 15 2000    Deal with missing second quotes in string values
 * Mar 17 2000    Return 2 from isnum() if number is floating point (.de)
 * Mar 17 2000    Ignore leading # for numeric values in header
 * Mar 21 2000    Implement -n to get string value starting with nth token
 * Apr  5 2000    Reject +- in isnum()
 * Jun  9 2000    Read keyword values even if no equal sign is present
 * Sep 20 2000    Ignore linefeed at end of number in isnum()
 * Oct 23 2000    Fix handling of embedded + or - in isnum()
 *
 * Jan 19 2000    Return 0 from isnum(), str2ra(), and str2dec() if string is null
 * Mar 30 2001    Fix header length finding algorithm in ksearch()
 * Jul 13 2001    Make val[] static int instead of int; drop unused variables
 * Sep 12 2001    Read yyyy/mm/dd dates as well as dd/mm/yyyy
 * Sep 20 2001    Ignore leading spaces in str2dec()
 * Sep 20 2001    Ignore trailing spaces in isnum()
 *
 * Apr  3 2002    Add hgetr8c(), hgeti4c(), and hgetsc() for multiple WCS handling
 * Apr 26 2002    Fix bug in hgetsc(), hgeti4c(), and hgetr8c() found by Bill Joye
 * Jun 26 2002    Do not drop leading or trailing spaces in multi-line values
 * Aug  6 2002    Add strcsrch() and strncsrch() for case-insensitive searches
 * Aug 30 2002    Fix bug so strcsrch() really is case-insensitive
 * Oct 20 2003    Add numdec() to return number of decimal places in a string
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