lib-src/test-distrib.c

   1 /* test-distrib.c --- testing distribution of nonprinting chars
   2
   3 Copyright (C) 1987, 1993-1995, 1999, 2001-2015 Free Software Foundation,
   4 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 #include <unistd.h>
  26
  27 /* Break string in two parts to avoid buggy C compilers that ignore characters
  28    after nulls in strings.  */
  29
  30 static char string1[] = "Testing distribution of nonprinting chars:\n\
  31 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  32 Should be 0000: ";
  33
  34 static char string2[] = ".\n\
  35 This file is read by the `test-distribution' program.\n\
  36 If you change it, you will make that program fail.\n";
  37
  38 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  39 static int
  40 cool_read (int fd, char *buf, size_t size)
  41 {
  42   ssize_t num;
  43   ssize_t sofar = 0;
  44
  45   while (1)
  46     {
  47       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  48         return sofar;
  49       else if (num < 0)
  50         return num;
  51       sofar += num;
  52     }
  53 }
  54
  55 int
  56 main (int argc, char **argv)
  57 {
  58   int fd;
  59   char buf[300];
  60
  61   if (argc != 2)
  62     {
  63       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  64       exit (EXIT_FAILURE);
  65     }
  66   fd = open (argv[1], O_RDONLY);
  67   if (fd < 0)
  68     {
  69       perror (argv[1]);
  70       exit (EXIT_FAILURE);
  71     }
  72   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  73       strcmp (buf, string1) ||
  74       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  75       strncmp (buf, string2, sizeof string2 - 1))
  76     {
  77       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  78 Most likely this means that many nonprinting characters\n\
  79 have been corrupted in the files of Emacs, and it will not work.\n",
  80                argv[1]);
  81       exit (EXIT_FAILURE);
  82     }
  83   close (fd);
  84   return EXIT_SUCCESS;
  85 }
  86
  87
  88 /* test-distrib.c ends here */