Repatch (from linux) of OSX IRAF

1 files changed, 743 insertions, 0 deletions

diff --git a/pkg/tbtables/cfitsio/getcols.c b/pkg/tbtables/cfitsio/getcols.c
new file mode 100644
index 00000000..b3c25209
--- /dev/null
+++ b/pkg/tbtables/cfitsio/getcols.c
@@ -0,0 +1,743 @@
+/*  This file, getcols.c, contains routines that read data elements from   */
+/*  a FITS image or table, with a character string datatype.               */
+
+/*  The FITSIO software was written by William Pence at the High Energy    */
+/*  Astrophysic Science Archive Research Center (HEASARC) at the NASA      */
+/*  Goddard Space Flight Center.                                           */
+
+#include <stdlib.h>
+#include <string.h>
+/* stddef.h is apparently needed to define size_t */
+#include <stddef.h>
+#include <ctype.h>
+#include "fitsio2.h"
+/*--------------------------------------------------------------------------*/
+int ffgcvs( fitsfile *fptr,   /* I - FITS file pointer                       */
+            int  colnum,      /* I - number of column to read (1 = 1st col)  */
+            long  firstrow,   /* I - first row to read (1 = 1st row)         */
+            long  firstelem,  /* I - first vector element to read (1 = 1st)  */
+            long  nelem,      /* I - number of strings to read               */
+            char *nulval,     /* I - string for null pixels                  */
+            char **array,     /* O - array of values that are read           */
+            int  *anynul,     /* O - set to 1 if any values are null; else 0 */
+            int  *status)     /* IO - error status                           */
+/*
+  Read an array of string values from a column in the current FITS HDU.
+  Any undefined pixels will be set equal to the value of 'nulval' unless
+  nulval = null in which case no checks for undefined pixels will be made.
+*/
+{
+    char cdummy[2];
+
+    ffgcls(fptr, colnum, firstrow, firstelem, nelem, 1, nulval,
+           array, cdummy, anynul, status);
+    return(*status);
+}
+/*--------------------------------------------------------------------------*/
+int ffgcfs( fitsfile *fptr,   /* I - FITS file pointer                       */
+            int  colnum,      /* I - number of column to read (1 = 1st col) */
+            long  firstrow,   /* I - first row to read (1 = 1st row)        */
+            long  firstelem,  /* I - first vector element to read (1 = 1st) */
+            long  nelem,      /* I - number of strings to read              */
+            char **array,     /* O - array of values that are read           */
+            char *nularray,   /* O - array of flags = 1 if nultyp = 2        */
+            int  *anynul,     /* O - set to 1 if any values are null; else 0 */
+            int  *status)     /* IO - error status                           */
+/*
+  Read an array of string values from a column in the current FITS HDU.
+  Nularray will be set = 1 if the corresponding array pixel is undefined, 
+  otherwise nularray will = 0.
+*/
+{
+    char dummy[2];
+
+    ffgcls(fptr, colnum, firstrow, firstelem, nelem, 2, dummy,
+           array, nularray, anynul, status);
+    return(*status);
+}
+/*--------------------------------------------------------------------------*/
+int ffgcls( fitsfile *fptr,   /* I - FITS file pointer                       */
+            int  colnum,      /* I - number of column to read (1 = 1st col) */
+            long  firstrow,   /* I - first row to read (1 = 1st row)        */
+            long  firstelem,  /* I - first vector element to read (1 = 1st) */
+            long  nelem,      /* I - number of strings to read              */
+            int   nultyp,     /* I - null value handling code:               */
+                              /*     1: set undefined pixels = nulval        */
+                              /*     2: set nularray=1 for undefined pixels  */
+            char  *nulval,    /* I - value for null pixels if nultyp = 1     */
+            char **array,     /* O - array of values that are read           */
+            char *nularray,   /* O - array of flags = 1 if nultyp = 2        */
+            int  *anynul,     /* O - set to 1 if any values are null; else 0 */
+            int  *status)     /* IO - error status                           */
+/*
+  Read an array of string values from a column in the current FITS HDU.
+  Returns a formated string value, regardless of the datatype of the column
+*/
+{
+    int tcode, hdutype, tstatus, scaled, intcol, dwidth, nulwidth, ll;
+    long ii, jj;
+    tcolumn *colptr;
+    char message[FLEN_ERRMSG], *carray, keyname[FLEN_KEYWORD];
+    char cform[20], dispfmt[20], tmpstr[80];
+    unsigned char byteval;
+    float *earray;
+    double *darray, tscale = 1.0;
+
+    if (*status > 0 || nelem == 0)  /* inherit input status value if > 0 */
+        return(*status);
+
+    /* reset position to the correct HDU if necessary */
+    if (fptr->HDUposition != (fptr->Fptr)->curhdu)
+        ffmahd(fptr, (fptr->HDUposition) + 1, NULL, status);
+
+    /* rescan header if data structure is undefined */
+    else if ((fptr->Fptr)->datastart == DATA_UNDEFINED)
+        if ( ffrdef(fptr, status) > 0)               
+            return(*status);
+
+    if (colnum < 1 || colnum > (fptr->Fptr)->tfield)
+    {
+        sprintf(message, "Specified column number is out of range: %d",
+                colnum);
+        ffpmsg(message);
+        return(*status = BAD_COL_NUM);
+    }
+
+    colptr  = (fptr->Fptr)->tableptr;   /* point to first column */
+    colptr += (colnum - 1);     /* offset to correct column structure */
+    tcode = abs(colptr->tdatatype);
+
+    if (tcode == TSTRING)
+    {
+      /* simply call the string column reading routine */
+      ffgcls2(fptr, colnum, firstrow, firstelem, nelem, nultyp, nulval,
+           array, nularray, anynul, status);
+    }
+    else if (tcode == TLOGICAL)
+    {
+      /* allocate memory for the array of logical values */
+      carray = (char *) malloc(nelem);
+
+      /*  call the logical column reading routine */
+      ffgcll(fptr, colnum, firstrow, firstelem, nelem, nultyp, *nulval,
+           carray, nularray, anynul, status); 
+
+      if (*status <= 0)
+      {
+         /* convert logical values to "T", "F", or "N" (Null) */
+         for (ii = 0; ii < nelem; ii++)
+         {
+           if (carray[ii] == 1)
+              strcpy(array[ii], "T");
+           else if (carray[ii] == 0)
+              strcpy(array[ii], "F");
+           else  /* undefined values = 2 */
+              strcpy(array[ii],"N");
+         }
+      }
+
+      free(carray);  /* free the memory */
+    }
+    else if (tcode == TCOMPLEX)
+    {
+      /* allocate memory for the array of double values */
+      earray = (float *) calloc(nelem * 2, sizeof(float) );
+      
+      ffgcle(fptr, colnum, firstrow, (firstelem - 1) * 2 + 1, nelem * 2,
+        1, 1, FLOATNULLVALUE, earray, nularray, anynul, status);
+
+      if (*status <= 0)
+      {
+
+         /* determine the format for the output strings */
+
+         ffgcdw(fptr, colnum, &dwidth, status);
+         dwidth = (dwidth - 3) / 2;
+ 
+         /* use the TDISPn keyword if it exists */
+         ffkeyn("TDISP", colnum, keyname, status);
+         tstatus = 0;
+         cform[0] = '\0';
+
+         if (ffgkys(fptr, keyname, dispfmt, NULL, &tstatus) == 0)
+         {
+             /* convert the Fortran style format to a C style format */
+             ffcdsp(dispfmt, cform);
+         }
+
+         if (!cform[0])
+             strcpy(cform, "%14.6E");
+
+         /* write the formated string for each value:  "(real,imag)" */
+         jj = 0;
+         for (ii = 0; ii < nelem; ii++)
+         {
+           strcpy(array[ii], "(");
+
+           /* test for null value */
+           if (earray[jj] == FLOATNULLVALUE)
+           {
+             strcpy(tmpstr, "NULL");
+             if (nultyp == 2)
+                nularray[ii] = 1;
+           }
+           else
+             sprintf(tmpstr, cform, earray[jj]);
+
+           strncat(array[ii], tmpstr, dwidth);
+           strcat(array[ii], ",");
+           jj++;
+
+           /* test for null value */
+           if (earray[jj] == FLOATNULLVALUE)
+           {
+             strcpy(tmpstr, "NULL");
+             if (nultyp == 2)
+                nularray[ii] = 1;
+           }
+           else
+             sprintf(tmpstr, cform, earray[jj]);
+
+           strncat(array[ii], tmpstr, dwidth);
+           strcat(array[ii], ")");
+           jj++;
+         }
+      }
+
+      free(earray);  /* free the memory */
+    }
+    else if (tcode == TDBLCOMPLEX)
+    {
+      /* allocate memory for the array of double values */
+      darray = (double *) calloc(nelem * 2, sizeof(double) );
+      
+      ffgcld(fptr, colnum, firstrow, (firstelem - 1) * 2 + 1, nelem * 2,
+        1, 1, DOUBLENULLVALUE, darray, nularray, anynul, status);
+
+      if (*status <= 0)
+      {
+         /* determine the format for the output strings */
+
+         ffgcdw(fptr, colnum, &dwidth, status);
+         dwidth = (dwidth - 3) / 2;
+
+         /* use the TDISPn keyword if it exists */
+         ffkeyn("TDISP", colnum, keyname, status);
+         tstatus = 0;
+         cform[0] = '\0';
+ 
+         if (ffgkys(fptr, keyname, dispfmt, NULL, &tstatus) == 0)
+         {
+             /* convert the Fortran style format to a C style format */
+             ffcdsp(dispfmt, cform);
+         }
+
+         if (!cform[0])
+            strcpy(cform, "%23.15E");
+
+         /* write the formated string for each value:  "(real,imag)" */
+         jj = 0;
+         for (ii = 0; ii < nelem; ii++)
+         {
+           strcpy(array[ii], "(");
+
+           /* test for null value */
+           if (darray[jj] == DOUBLENULLVALUE)
+           {
+             strcpy(tmpstr, "NULL");
+             if (nultyp == 2)
+                nularray[ii] = 1;
+           }
+           else
+             sprintf(tmpstr, cform, darray[jj]);
+
+           strncat(array[ii], tmpstr, dwidth);
+           strcat(array[ii], ",");
+           jj++;
+
+           /* test for null value */
+           if (darray[jj] == DOUBLENULLVALUE)
+           {
+             strcpy(tmpstr, "NULL");
+             if (nultyp == 2)
+                nularray[ii] = 1;
+           }
+           else
+             sprintf(tmpstr, cform, darray[jj]);
+
+           strncat(array[ii], tmpstr, dwidth);
+           strcat(array[ii], ")");
+           jj++;
+         }
+      }
+
+      free(darray);  /* free the memory */
+    }
+    else
+    {
+      /* allocate memory for the array of double values */
+      darray = (double *) calloc(nelem, sizeof(double) );
+      
+      /* read all other numeric type columns as doubles */
+      if (ffgcld(fptr, colnum, firstrow, firstelem, nelem, 1, nultyp, 
+           DOUBLENULLVALUE, darray, nularray, anynul, status) > 0)
+      {
+         free(darray);
+         return(*status);
+      }
+
+      /* determine the format for the output strings */
+
+      ffgcdw(fptr, colnum, &dwidth, status);
+
+      /* check if  column is scaled */
+      ffkeyn("TSCAL", colnum, keyname, status);
+      tstatus = 0;
+      scaled = 0;
+      if (ffgkyd(fptr, keyname, &tscale, NULL, &tstatus) == 0)
+      {
+            if (tscale != 1.0)
+                scaled = 1;    /* yes, this is a scaled column */
+      }
+
+      intcol = 0;
+      if (tcode <= TLONG && !scaled)
+             intcol = 1;   /* this is an unscaled integer column */
+
+      /* use the TDISPn keyword if it exists */
+      ffkeyn("TDISP", colnum, keyname, status);
+      tstatus = 0;
+      cform[0] = '\0';
+
+      if (ffgkys(fptr, keyname, dispfmt, NULL, &tstatus) == 0)
+      {
+           /* convert the Fortran style TDISPn to a C style format */
+           ffcdsp(dispfmt, cform);
+      }
+
+      if (!cform[0])
+      {
+            /* no TDISPn keyword; use TFORMn instead */
+
+            ffkeyn("TFORM", colnum, keyname, status);
+            ffgkys(fptr, keyname, dispfmt, NULL, status);
+
+            if (scaled && tcode <= TSHORT)
+            {
+                  /* scaled short integer column == float */
+                  strcpy(cform, "%#14.6G");
+            }
+            else if (scaled && tcode == TLONG)
+            {
+                  /* scaled long integer column == double */
+                  strcpy(cform, "%#23.15G");
+            }
+            else
+            {
+               ffghdt(fptr, &hdutype, status);
+               if (hdutype == ASCII_TBL)
+               {
+                  /* convert the Fortran style TFORMn to a C style format */
+                  ffcdsp(dispfmt, cform);
+               }
+               else
+               {
+                 /* this is a binary table, need to convert the format */
+                  if (tcode == TBIT) {            /* 'X' */
+                     strcpy(cform, "%4d");
+                  } else if (tcode == TBYTE) {    /* 'B' */
+                     strcpy(cform, "%4d");
+                  } else if (tcode == TSHORT) {   /* 'I' */
+                     strcpy(cform, "%6d");
+                  } else if (tcode == TLONG) {    /* 'J' */
+                     strcpy(cform, "%11.0f");
+                     intcol = 0;  /* needed to support unsigned int */
+                  } else if (tcode == TFLOAT) {   /* 'E' */
+                     strcpy(cform, "%#14.6G");
+                  } else if (tcode == TDOUBLE) {  /* 'D' */
+                     strcpy(cform, "%#23.15G");
+                  }
+               }
+            }
+      } 
+
+      /* write the formated string for each value */
+      nulwidth = strlen(nulval);
+      for (ii = 0; ii < nelem; ii++)
+      {
+           if (tcode == TBIT)
+           {
+               byteval = (char) darray[ii];
+
+               for (ll=0; ll < 8; ll++)
+               {
+                   if ( ((unsigned char) (byteval << ll)) >> 7 )
+                       *(array[ii] + ll) = '1';
+                   else
+                       *(array[ii] + ll) = '0';
+               }
+               *(array[ii] + 8) = '\0';
+           }
+           /* test for null value */
+           else if ( (nultyp == 1 && darray[ii] == DOUBLENULLVALUE) ||
+                (nultyp == 2 && nularray[ii]) )
+           {
+              *array[ii] = '\0';
+              if (dwidth < nulwidth)
+                  strncat(array[ii], nulval, dwidth);
+              else
+                  sprintf(array[ii],"%*s",dwidth,nulval);
+           }
+           else
+           {
+              if (intcol)    
+                sprintf(tmpstr, cform, (int) darray[ii]);
+              else
+                sprintf(tmpstr, cform, darray[ii]);
+
+              *array[ii] = '\0';
+              strncat(array[ii], tmpstr, dwidth);
+           }
+      }
+
+      free(darray);  /* free the memory */
+    }
+    return(*status);
+}
+/*--------------------------------------------------------------------------*/
+int ffgcdw( fitsfile *fptr,   /* I - FITS file pointer                       */
+            int  colnum,      /* I - number of column (1 = 1st col)      */
+            int  *width,      /* O - display width                       */
+            int  *status)     /* IO - error status                           */
+/*
+  Get Column Display Width.
+*/
+{
+    tcolumn *colptr;
+    char *cptr;
+    char message[FLEN_ERRMSG], keyname[FLEN_KEYWORD], dispfmt[20];
+    int tcode, hdutype, tstatus, scaled;
+    double tscale;
+
+    if (*status > 0)  /* inherit input status value if > 0 */
+        return(*status);
+
+    if (fptr->HDUposition != (fptr->Fptr)->curhdu)
+        ffmahd(fptr, (fptr->HDUposition) + 1, NULL, status);
+
+    if (colnum < 1 || colnum > (fptr->Fptr)->tfield)
+    {
+        sprintf(message, "Specified column number is out of range: %d",
+                colnum);
+        ffpmsg(message);
+        return(*status = BAD_COL_NUM);
+    }
+
+    colptr  = (fptr->Fptr)->tableptr;   /* point to first column */
+    colptr += (colnum - 1);     /* offset to correct column structure */
+    tcode = abs(colptr->tdatatype);
+
+    /* use the TDISPn keyword if it exists */
+    ffkeyn("TDISP", colnum, keyname, status);
+
+    *width = 0;
+    tstatus = 0;
+    if (ffgkys(fptr, keyname, dispfmt, NULL, &tstatus) == 0)
+    {
+          /* parse TDISPn get the display width */
+          cptr = dispfmt;
+          while(*cptr == ' ') /* skip leading blanks */
+              cptr++;
+
+          if (*cptr == 'A' || *cptr == 'a' ||
+              *cptr == 'I' || *cptr == 'i' ||
+              *cptr == 'O' || *cptr == 'o' ||
+              *cptr == 'Z' || *cptr == 'z' ||
+              *cptr == 'F' || *cptr == 'f' ||
+              *cptr == 'E' || *cptr == 'e' ||
+              *cptr == 'D' || *cptr == 'd' ||
+              *cptr == 'G' || *cptr == 'g')
+          {
+
+            while(!isdigit((int) *cptr) && *cptr != '\0') /* find 1st digit */
+              cptr++;
+
+            *width = atoi(cptr);
+            if (tcode >= TCOMPLEX)
+              *width = (2 * (*width)) + 3;
+          }
+    }
+
+    if (*width == 0)
+    {
+        /* no valid TDISPn keyword; use TFORMn instead */
+
+        ffkeyn("TFORM", colnum, keyname, status);
+        ffgkys(fptr, keyname, dispfmt, NULL, status);
+
+        /* check if  column is scaled */
+        ffkeyn("TSCAL", colnum, keyname, status);
+        tstatus = 0;
+        scaled = 0;
+
+        if (ffgkyd(fptr, keyname, &tscale, NULL, &tstatus) == 0)
+        {
+            if (tscale != 1.0)
+                scaled = 1;    /* yes, this is a scaled column */
+        }
+
+        if (scaled && tcode <= TSHORT)
+        {
+            /* scaled short integer col == float; default format is 14.6G */
+            *width = 14;
+        }
+        else if (scaled && tcode == TLONG)
+        {
+            /* scaled long integer col == double; default format is 23.15G */
+            *width = 23;
+        }
+        else
+        {
+           ffghdt(fptr, &hdutype, status);  /* get type of table */
+           if (hdutype == ASCII_TBL)
+           {
+              /* parse TFORMn get the display width */
+              cptr = dispfmt;
+              while(!isdigit((int) *cptr) && *cptr != '\0') /* find 1st digit */
+                 cptr++;
+
+              *width = atoi(cptr);
+           }
+           else
+           {
+                 /* this is a binary table */
+                  if (tcode == TBIT)           /* 'X' */
+                     *width = 8;
+                  else if (tcode == TBYTE)          /* 'B' */
+                     *width = 4;
+                  else if (tcode == TSHORT)    /* 'I' */
+                     *width = 6;
+                  else if (tcode == TLONG)     /* 'J' */
+                     *width = 11;
+                  else if (tcode == TFLOAT)    /* 'E' */
+                     *width = 14;
+                  else if (tcode == TDOUBLE)   /* 'D' */
+                     *width = 23;
+                  else if (tcode == TCOMPLEX)  /* 'C' */
+                     *width = 31;
+                  else if (tcode == TDBLCOMPLEX)  /* 'M' */
+                     *width = 49;
+                  else if (tcode == TLOGICAL)  /* 'L' */
+                     *width = 1;
+                  else if (tcode == TSTRING)   /* 'A' */
+                  {
+                     cptr = dispfmt;
+                     while(!isdigit((int) *cptr) && *cptr != '\0') 
+                         cptr++;
+
+                     *width = atoi(cptr);
+
+                     if (*width < 1)
+                         *width = 1;  /* default is at least 1 column */
+                  }
+            }
+        }
+    } 
+    return(*status);
+}
+/*--------------------------------------------------------------------------*/
+int ffgcls2 ( fitsfile *fptr,   /* I - FITS file pointer                       */
+            int  colnum,      /* I - number of column to read (1 = 1st col) */
+            long  firstrow,   /* I - first row to read (1 = 1st row)        */
+            long  firstelem,  /* I - first vector element to read (1 = 1st) */
+            long  nelem,      /* I - number of strings to read              */
+            int   nultyp,     /* I - null value handling code:               */
+                              /*     1: set undefined pixels = nulval        */
+                              /*     2: set nularray=1 for undefined pixels  */
+            char  *nulval,    /* I - value for null pixels if nultyp = 1     */
+            char **array,     /* O - array of values that are read           */
+            char *nularray,   /* O - array of flags = 1 if nultyp = 2        */
+            int  *anynul,     /* O - set to 1 if any values are null; else 0 */
+            int  *status)     /* IO - error status                           */
+/*
+  Read an array of string values from a column in the current FITS HDU.
+*/
+{
+    long nullen; 
+    int tcode, maxelem, hdutype, nulcheck;
+    long twidth, incre, rownum;
+    long ii, jj, ntodo, tnull, remain, next;
+    OFF_T repeat, startpos, elemnum, readptr, rowlen;
+    double scale, zero;
+    char tform[20];
+    char message[FLEN_ERRMSG];
+    char snull[20];   /*  the FITS null value  */
+    tcolumn *colptr;
+
+    double cbuff[DBUFFSIZE / sizeof(double)]; /* align cbuff on word boundary */
+    char *buffer, *arrayptr;
+
+    if (*status > 0 || nelem == 0)  /* inherit input status value if > 0 */
+        return(*status);
+
+    if (fptr->HDUposition != (fptr->Fptr)->curhdu)
+        ffmahd(fptr, (fptr->HDUposition) + 1, NULL, status);
+
+    if (anynul)
+        *anynul = 0;
+
+    if (nultyp == 2)
+        memset(nularray, 0, nelem);   /* initialize nullarray */
+
+    /*---------------------------------------------------*/
+    /*  Check input and get parameters about the column: */
+    /*---------------------------------------------------*/
+    if (colnum < 1 || colnum > (fptr->Fptr)->tfield)
+    {
+        sprintf(message, "Specified column number is out of range: %d",
+                colnum);
+        ffpmsg(message);
+        return(*status = BAD_COL_NUM);
+    }
+
+    colptr  = (fptr->Fptr)->tableptr;   /* point to first column */
+    colptr += (colnum - 1);     /* offset to correct column structure */
+    tcode = colptr->tdatatype;
+
+    if (tcode == -TSTRING) /* variable length column in a binary table? */
+    {
+      /* only read a single string; ignore value of firstelem */
+
+      if (ffgcpr( fptr, colnum, firstrow, 1, 1, 0, &scale, &zero,
+        tform, &twidth, &tcode, &maxelem, &startpos,  &elemnum, &incre,
+        &repeat, &rowlen, &hdutype, &tnull, snull, status) > 0)
+        return(*status);
+
+      remain = 1;
+      twidth = repeat;  
+    }
+    else if (tcode == TSTRING)
+    {
+      if (ffgcpr( fptr, colnum, firstrow, firstelem, nelem, 0, &scale, &zero,
+        tform, &twidth, &tcode, &maxelem, &startpos,  &elemnum, &incre,
+        &repeat, &rowlen, &hdutype, &tnull, snull, status) > 0)
+        return(*status);
+
+      remain = nelem;
+    }
+    else
+        return(*status = NOT_ASCII_COL);
+
+    nullen = strlen(snull);   /* length of the undefined pixel string */
+    if (nullen == 0)
+        nullen = 1;
+ 
+    /*------------------------------------------------------------------*/
+    /*  Decide whether to check for null values in the input FITS file: */
+    /*------------------------------------------------------------------*/
+    nulcheck = nultyp; /* by default check for null values in the FITS file */
+
+    if (nultyp == 1 && nulval[0] == 0)
+       nulcheck = 0;    /* calling routine does not want to check for nulls */
+
+    else if (snull[0] == ASCII_NULL_UNDEFINED)
+       nulcheck = 0;   /* null value string in ASCII table not defined */
+
+    else if (nullen > twidth)
+       nulcheck = 0;   /* null value string is longer than width of column  */
+                       /* thus impossible for any column elements to = null */
+
+    /*---------------------------------------------------------------------*/
+    /*  Now read the strings one at a time from the FITS column.           */
+    /*---------------------------------------------------------------------*/
+    next = 0;                 /* next element in array to be read  */
+    rownum = 0;               /* row number, relative to firstrow     */
+
+    while (remain)
+    {
+      /* limit the number of pixels to process a one time to the number that
+         will fit in the buffer space or to the number of pixels that remain
+         in the current vector, which ever is smaller.
+      */
+      ntodo = minvalue(remain, maxelem);      
+      ntodo = minvalue(ntodo, (repeat - elemnum));
+
+      readptr = startpos + ((OFF_T)rownum * rowlen) + (elemnum * incre);
+      ffmbyt(fptr, readptr, REPORT_EOF, status);  /* move to read position */
+
+      /* read the array of strings from the FITS file into the buffer */
+
+      if (incre == twidth)
+         ffgbyt(fptr, ntodo * twidth, cbuff, status);
+      else
+         ffgbytoff(fptr, twidth, ntodo, incre - twidth, cbuff, status);
+
+      /* copy from the buffer into the user's array of strings */
+      /* work backwards from last char of last string to 1st char of 1st */
+
+      buffer = ((char *) cbuff) + (ntodo * twidth) - 1;
+
+      for (ii = next + ntodo - 1; ii >= next; ii--)
+      {
+         arrayptr = array[ii] + twidth - 1;
+
+         for (jj = twidth - 1; jj > 0; jj--)  /* ignore trailing blanks */
+         {
+            if (*buffer == ' ')
+            {
+              buffer--;
+              arrayptr--;
+            }
+            else
+              break;
+         }
+         *(arrayptr + 1) = 0;  /* write the string terminator */
+         
+         for (; jj >= 0; jj--)    /* copy the string itself */
+         {
+           *arrayptr = *buffer;
+           buffer--;
+           arrayptr--;
+         }
+
+         /* check if null value is defined, and if the   */
+         /* column string is identical to the null string */
+         if (nulcheck && !strncmp(snull, array[ii], nullen) )
+         {
+           *anynul = 1;   /* this is a null value */
+           if (nultyp == 1)
+             strcpy(array[ii], nulval);
+           else
+             nularray[ii] = 1;
+         }
+      }
+    
+      if (*status > 0)  /* test for error during previous read operation */
+      {
+         sprintf(message,
+          "Error reading elements %ld thru %ld of data array (ffpcls).",
+             next+1, next+ntodo);
+
+         ffpmsg(message);
+         return(*status);
+      }
+
+      /*--------------------------------------------*/
+      /*  increment the counters for the next loop  */
+      /*--------------------------------------------*/
+      next += ntodo;
+      remain -= ntodo;
+      if (remain)
+      {
+          elemnum += ntodo;
+          if (elemnum == repeat)  /* completed a row; start on next row */
+          {
+              elemnum = 0;
+              rownum++;
+          }
+      }
+    }  /*  End of main while Loop  */
+
+    return(*status);
+}
+