glibc/sysdeps/posix/mk-stdiolim.c

/* Copyright (C) 1991, 1992, 1993, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

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

   The GNU C 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <bits/posix1_lim.h>

int
main()
{
  /* Print copyright message.  */
  printf ("\
/* Stdio limits for POSIX systems.\n\
   Copyright (C) 1994, 1997 Free Software Foundation, Inc.\n\
   This file is part of the GNU C Library.\n\
\n\
   The GNU C Library is free software; you can redistribute it and/or\n\
   modify it under the terms of the GNU Library General Public License as\n\
   published by the Free Software Foundation; either version 2 of the\n\
   License, or (at your option) any later version.\n\
\n\
   The GNU C Library is distributed in the hope that it will be useful,\n\
   but WITHOUT ANY WARRANTY; without even the implied warranty of\n\
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n\
   Library General Public License for more details.\n\
\n\
   You should have received a copy of the GNU Library General Publicn\n\
   License along with the GNU C Library; see the file COPYING.LIB.  If not,\n\
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,\n\
   Boston, MA 02111-1307, USA.  */\n\
\n\
#if !defined _STDIO_H && !defined __need_FOPEN_MAX\n\
# error \"Never include <bits/stdio_lim.h> directly; use <stdio.h> instead.\"\n\
#endif\n\
\n");

  /* These values correspond to the code in sysdeps/posix/tempname.c.
     Change the values here if you change that code.  */
  puts ("#ifdef _STDIO_H");
  printf ("# define L_tmpnam %u\n", sizeof ("/usr/tmp/") + 9);
  printf ("# define TMP_MAX %u\n", 62 * 62 * 62);

  puts   ("# ifdef __USE_POSIX");
  printf ("#  define L_ctermid %u\n", sizeof ("/dev/tty"));
  printf ("#  define L_cuserid 9\n");
  puts   ("# endif");

  printf (" #define FILENAME_MAX %u\n",
#ifdef	PATH_MAX
	  PATH_MAX
#else
	 /* This is supposed to be the size needed to hold the longest file
	    name string the implementation guarantees can be opened.
	    PATH_MAX not being defined means the actual limit on the length
	    of a file name is runtime-variant (or it is unlimited).  ISO
	    says in such a case FILENAME_MAX should be a good size to
	    allocate for a file name string.  POSIX.1 guarantees that a
	    file name up to _POSIX_PATH_MAX chars long can be opened, so
	    this value must be at least that.  */
	  1024		/* _POSIX_PATH_MAX is 255.  */
#endif
	  );

  puts ("# undef __need_FOPEN_MAX");
  puts ("# define __need_FOPEN_MAX	1");
  puts ("#endif\n");

  /* POSIX does not require that OPEN_MAX and PATH_MAX be defined, so
     <bits/local_lim.h> will not define them if they are run-time
     variant (which is the case in the Hurd).  ISO still requires
     that FOPEN_MAX and FILENAME_MAX be defined, however.  */

  puts ("#if defined __need_FOPEN_MAX && !defined __defined_FOPEN_MAX");
  puts ("# define __defined_FOPEN_MAX");
  printf ("# define FOPEN_MAX %u\n",
#ifdef	OPEN_MAX

	  OPEN_MAX
#else
	 /* This is the minimum number of files that the implementation
	    guarantees can be open simultaneously.  OPEN_MAX not being
	    defined means the maximum is run-time variant; but POSIX.1
	    requires that it never be less than _POSIX_OPEN_MAX, so that is
	    a good minimum to use.  */
	  _POSIX_OPEN_MAX
#endif

	  );
  puts ("#endif");
  puts ("#undef __need_FOPEN_MAX");

  exit (0);
}