lib-src/test-distrib.c

   1 /* test-distrib.c --- testing distribution of nonprinting chars
   2
   3 Copyright (C) 1987, 1993, 1994, 1995, 1999, 2001, 2002, 2003, 2004, 2005,
   4               2006, 2007, 2008, 2009, 2010  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 3 of the License, or
  11 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include <config.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25
  26 #ifdef HAVE_UNISTD_H
  27 #include <unistd.h>
  28 #endif
  29
  30 /* Break string in two parts to avoid buggy C compilers that ignore characters
  31    after nulls in strings.  */
  32
  33 char string1[] = "Testing distribution of nonprinting chars:\n\
  34 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  35 Should be 0000: ";
  36
  37 char string2[] = ".\n\
  38 This file is read by the `test-distribution' program.\n\
  39 If you change it, you will make that program fail.\n";
  40
  41 char buf[300];
  42
  43 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  44 int
  45 cool_read (int fd, char *buf, size_t size)
  46 {
  47   ssize_t num;
  48   ssize_t sofar = 0;
  49
  50   while (1)
  51     {
  52       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  53         return sofar;
  54       else if (num < 0)
  55         return num;
  56       sofar += num;
  57     }
  58 }
  59
  60 int
  61 main (int argc, char **argv)
  62 {
  63   int fd;
  64
  65   if (argc != 2)
  66     {
  67       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  68       exit (EXIT_FAILURE);
  69     }
  70   fd = open (argv[1], O_RDONLY);
  71   if (fd < 0)
  72     {
  73       perror (argv[1]);
  74       exit (EXIT_FAILURE);
  75     }
  76   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  77       strcmp (buf, string1) ||
  78       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  79       strncmp (buf, string2, sizeof string2 - 1))
  80     {
  81       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  82 Most likely this means that many nonprinting characters\n\
  83 have been corrupted in the files of Emacs, and it will not work.\n",
  84                argv[1]);
  85       exit (EXIT_FAILURE);
  86     }
  87   close (fd);
  88   return EXIT_SUCCESS;
  89 }
  90
  91 /* arch-tag: 3a89005d-df98-4c32-aa9f-33570e16a26a
  92    (do not change this comment) */
  93
  94 /* test-distrib.c ends here */