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/*

FUNCTION

<<tmpfile>>---create a temporary file

INDEX

        tmpfile

INDEX

        _tmpfile_r

ANSI_SYNOPSIS

        #include <stdio.h>

        FILE *tmpfile(void);

        FILE *_tmpfile_r(struct _reent *<[reent]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        FILE *tmpfile();

        FILE *_tmpfile_r(<[reent]>)

        struct _reent *<[reent]>;

DESCRIPTION

Create a temporary file (a file which will be deleted automatically),

using a name generated by <<tmpnam>>.  The temporary file is opened with

the mode <<"wb+">>, permitting you to read and write anywhere in it

as a binary file (without any data transformations the host system may

perform for text files).

The alternate function <<_tmpfile_r>> is a reentrant version.  The

argument <[reent]> is a pointer to a reentrancy structure.

RETURNS

<<tmpfile>> normally returns a pointer to the temporary file.  If no

temporary file could be created, the result is NULL, and <<errno>>

records the reason for failure.

PORTABILITY

Both ANSI C and the System V Interface Definition (Issue 2) require

<<tmpfile>>.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<getpid>>,

<<isatty>>, <<lseek>>, <<open>>, <<read>>, <<sbrk>>, <<write>>.

<<tmpfile>> also requires the global pointer <<environ>>.

*/

#include <_ansi.h>

#include <reent.h>

#include <stdio.h>

#include <errno.h>

#include <fcntl.h>

#include <sys/stat.h>

#ifndef O_BINARY

# define O_BINARY 0

#endif

FILE *

_DEFUN(_tmpfile_r, (ptr),

       struct _reent *ptr)

{

  FILE *fp;

  int e;

  char *f;

  char buf[L_tmpnam];

  int fd;

  do

    {

      if ((f = _tmpnam_r (ptr, buf)) == NULL)

        return NULL;

      fd = _open_r (ptr, f, O_RDWR | O_CREAT | O_EXCL | O_BINARY,

                    S_IRUSR | S_IWUSR);

    }

  while (fd < 0 && ptr->_errno == EEXIST);

  if (fd < 0)

    return NULL;

  fp = _fdopen_r (ptr, fd, "wb+");

  e = ptr->_errno;

  if (!fp)

    _close_r (ptr, fd);

  _CAST_VOID _remove_r (ptr, f);

  ptr->_errno = e;

  return fp;

}

#ifndef _REENT_ONLY

FILE *

_DEFUN_VOID(tmpfile)

{

  return _tmpfile_r (_REENT);

}

#endif