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 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #ifdef HAVE_FCNTL_H
  29 #include <fcntl.h>
  30 #endif
  31
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35
  36 #ifndef O_RDONLY
  37 #define O_RDONLY 0
  38 #endif
  39
  40 /* Break string in two parts to avoid buggy C compilers that ignore characters
  41    after nulls in strings.  */
  42
  43 char string1[] = "Testing distribution of nonprinting chars:\n\
  44 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  45 Should be 0000: ";
  46
  47 char string2[] = ".\n\
  48 This file is read by the `test-distribution' program.\n\
  49 If you change it, you will make that program fail.\n";
  50
  51 char buf[300];
  52
  53 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  54 int
  55 cool_read (int fd, char *buf, int size)
  56 {
  57   int num, sofar = 0;
  58
  59   while (1)
  60     {
  61       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  62         return sofar;
  63       else if (num < 0)
  64         return num;
  65       sofar += num;
  66     }
  67 }
  68
  69 int
  70 main (int argc, char **argv)
  71 {
  72   int fd;
  73
  74   if (argc != 2)
  75     {
  76       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  77       exit (EXIT_FAILURE);
  78     }
  79   fd = open (argv[1], O_RDONLY);
  80   if (fd < 0)
  81     {
  82       perror (argv[1]);
  83       exit (EXIT_FAILURE);
  84     }
  85   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  86       strcmp (buf, string1) ||
  87       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  88       strncmp (buf, string2, sizeof string2 - 1))
  89     {
  90       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  91 Most likely this means that many nonprinting characters\n\
  92 have been corrupted in the files of Emacs, and it will not work.\n",
  93                argv[1]);
  94       exit (EXIT_FAILURE);
  95     }
  96   close (fd);
  97   return EXIT_SUCCESS;
  98 }
  99
 100 /* arch-tag: 3a89005d-df98-4c32-aa9f-33570e16a26a
 101    (do not change this comment) */
 102
 103 /* test-distrib.c ends here */