sysdeps/posix/mk-stdiolim.c

   1 /* Copyright (C) 1991, 1992, 1993, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <bits/posix1_lim.h>
  20
  21 int
  22 main()
  23 {
  24   /* Print copyright message.  */
  25   printf ("\
  26 /* Stdio limits for POSIX systems.\n\
  27    Copyright (C) 1994, 1997 Free Software Foundation, Inc.\n\
  28    This file is part of the GNU C Library.\n\
  29 \n\
  30    The GNU C Library is free software; you can redistribute it and/or\n\
  31    modify it under the terms of the GNU Library General Public License as\n\
  32    published by the Free Software Foundation; either version 2 of the\n\
  33    License, or (at your option) any later version.\n\
  34 \n\
  35    The GNU C Library is distributed in the hope that it will be useful,\n\
  36    but WITHOUT ANY WARRANTY; without even the implied warranty of\n\
  37    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n\
  38    Library General Public License for more details.\n\
  39 \n\
  40    You should have received a copy of the GNU Library General Publicn\n\
  41    License along with the GNU C Library; see the file COPYING.LIB.  If not,\n\
  42    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,\n\
  43    Boston, MA 02111-1307, USA.  */\n\
  44 \n\
  45 #if !defined _STDIO_H && !defined __need_FOPEN_MAX\n\
  46 # error \"Never include <bits/stdio_lim.h> directly; use <stdio.h> instead.\"\n\
  47 #endif\n\
  48 \n");
  49
  50   /* These values correspond to the code in sysdeps/posix/tempname.c.
  51      Change the values here if you change that code.  */
  52   puts ("#ifdef _STDIO_H");
  53   printf ("# define L_tmpnam %u\n", sizeof ("/usr/tmp/") + 9);
  54   printf ("# define TMP_MAX %u\n", 62 * 62 * 62);
  55
  56   puts   ("# ifdef __USE_POSIX");
  57   printf ("#  define L_ctermid %u\n", sizeof ("/dev/tty"));
  58   printf ("#  define L_cuserid 9\n");
  59   puts   ("# endif");
  60
  61   printf (" #define FILENAME_MAX %u\n",
  62 #ifdef  PATH_MAX
  63           PATH_MAX
  64 #else
  65          /* This is supposed to be the size needed to hold the longest file
  66             name string the implementation guarantees can be opened.
  67             PATH_MAX not being defined means the actual limit on the length
  68             of a file name is runtime-variant (or it is unlimited).  ISO
  69             says in such a case FILENAME_MAX should be a good size to
  70             allocate for a file name string.  POSIX.1 guarantees that a
  71             file name up to _POSIX_PATH_MAX chars long can be opened, so
  72             this value must be at least that.  */
  73           1024          /* _POSIX_PATH_MAX is 255.  */
  74 #endif
  75           );
  76
  77   puts ("# undef __need_FOPEN_MAX");
  78   puts ("# define __need_FOPEN_MAX      1");
  79   puts ("#endif\n");
  80
  81   /* POSIX does not require that OPEN_MAX and PATH_MAX be defined, so
  82      <bits/local_lim.h> will not define them if they are run-time
  83      variant (which is the case in the Hurd).  ISO still requires
  84      that FOPEN_MAX and FILENAME_MAX be defined, however.  */
  85
  86   puts ("#if defined __need_FOPEN_MAX && !defined __defined_FOPEN_MAX");
  87   puts ("# define __defined_FOPEN_MAX");
  88   printf ("# define FOPEN_MAX %u\n",
  89 #ifdef  OPEN_MAX
  90
  91           OPEN_MAX
  92 #else
  93          /* This is the minimum number of files that the implementation
  94             guarantees can be open simultaneously.  OPEN_MAX not being
  95             defined means the maximum is run-time variant; but POSIX.1
  96             requires that it never be less than _POSIX_OPEN_MAX, so that is
  97             a good minimum to use.  */
  98           _POSIX_OPEN_MAX
  99 #endif
 100
 101           );
 102   puts ("#endif");
 103   puts ("#undef __need_FOPEN_MAX");
 104
 105   exit (0);
 106 }