/*! \defgroup PSIO libpsio: The PSI I/O Library */

/*!
** \file close.c
** \ingroup (PSIO)
*/

#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include "psio.h"

/*!
** \ingroup (PSIO)
** PSIO_CLOSE(): Closes a multivolume PSI direct access file.
**
**  \param unit = The PSI unit number used to identify the file to all read
**                and write functions.
**  \param keep = Boolean to indicate if the file should be deleted (0) or
**                retained (1).
*/

int psio_close(unsigned int unit, int keep)
{
  unsigned int i;
  psio_ud *this_unit;
  psio_tocentry *this_entry, *next_entry;

  this_unit = &(psio_unit[unit]);

  /* First check to see if this unit is already closed */
  if(this_unit->vol[0].stream == -1) psio_error(unit,PSIO_ERROR_RECLOSE);

  /* Dump the current TOC back out to disk */
  psio_tocwrite(unit);

  /* Free the TOC */
  this_entry = this_unit->toc;
  for(i=0; i < this_unit->toclen; i++) {
      next_entry = this_entry->next;
      free(this_entry);
      this_entry = next_entry;
    }

  /* Close each volume (remove if necessary) and free the path */
  for(i=0; i < this_unit->numvols; i++) {

      if(close(this_unit->vol[i].stream) == -1)
	  psio_error(unit,PSIO_ERROR_CLOSE);

      /* Delete the file completely if requested */
      if(!keep) unlink(this_unit->vol[i].path);

      free(this_unit->vol[i].path);
      this_unit->vol[i].path = NULL;
      this_unit->vol[i].stream = -1;
    }

  /* Reset the global page stats to zero */
  this_unit->numvols = 0;
  this_unit->toclen = 0;
  this_unit->tocaddress.page = 0;
  this_unit->tocaddress.offset = 0;

  return(0);
}
