#include "pq_defs.h"
#include "pq_functions.h"
#include "constants.h"

/* set up a temporary file and return an appropriate FILE_TYPE indicator; 
   if in Unix environment, open temporary file in directory specified 
   by value of environment variable TMPDIR, else on /var/tmp */

FILE_TYPE TemporaryFile ()
{
   FILE_TYPE file;

#if defined (UNIX)

   char *name;

#if defined (HAS_NO_TEMPNAM)
   if ( (name = tmpnam(0)) == NULL ) {
      perror ("Cannot open temporary file");
      exit (FAILURE);
   }
#else
   if ((name = tempnam (NULL, "PQ")) == NULL) {
      perror ("Cannot open temporary file");
      exit (FAILURE);
   }
#endif

   file = OpenFile (name, "w+");

   if (unlink (name) != 0) {
      perror ("Cannot unlink temporary file");
      exit (FAILURE);
   }

#else 

   if ((file = tmpfile ()) == NULL) {
      perror ("Cannot open temporary file");
      exit (FAILURE);
   }

#endif

   return file;
}