lib-src/test-distrib.c

   1 /* test-distrib.c --- testing distribution of nonprinting chars
   2
   3    Copyright (C) 1987, 1993, 1994, 1995, 1999, 2001
   4       Free Software Foundation Inc.
   5
   6    This file is part of GNU Emacs.
   7
   8    GNU Emacs is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GNU Emacs is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GNU Emacs; see the file COPYING.  If not, write to the
  20    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28
  29 #ifdef HAVE_FCNTL_H
  30 #include <fcntl.h>
  31 #endif
  32
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36
  37 #ifndef O_RDONLY
  38 #define O_RDONLY 0
  39 #endif
  40
  41 /* Break string in two parts to avoid buggy C compilers that ignore characters
  42    after nulls in strings.  */
  43
  44 char string1[] = "Testing distribution of nonprinting chars:\n\
  45 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  46 Should be 0000: ";
  47
  48 char string2[] = ".\n\
  49 This file is read by the `test-distribution' program.\n\
  50 If you change it, you will make that program fail.\n";
  51
  52 char buf[300];
  53
  54 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  55 int
  56 cool_read (fd, buf, size)
  57      int fd;
  58      char *buf;
  59      int size;
  60 {
  61   int num, sofar = 0;
  62
  63   while (1)
  64     {
  65       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  66         return sofar;
  67       else if (num < 0)
  68         return num;
  69       sofar += num;
  70     }
  71 }
  72
  73 int
  74 main (argc, argv)
  75      int argc;
  76      char **argv;
  77 {
  78   int fd;
  79
  80   if (argc != 2)
  81     {
  82       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  83       exit (2);
  84     }
  85   fd = open (argv[1], O_RDONLY);
  86   if (fd < 0)
  87     {
  88       perror (argv[1]);
  89       exit (2);
  90     }
  91   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  92       strcmp (buf, string1) ||
  93       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  94       strncmp (buf, string2, sizeof string2 - 1))
  95     {
  96       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  97 Most likely this means that many nonprinting characters\n\
  98 have been corrupted in the files of Emacs, and it will not work.\n",
  99                argv[1]);
 100       exit (2);
 101     }
 102   close (fd);
 103 #ifdef VMS
 104   exit (1);                     /* On VMS, success is 1.  */
 105 #endif
 106   return (0);
 107 }