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
  20    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31
  32 #ifndef O_RDONLY
  33 #define O_RDONLY 0
  34 #endif
  35
  36 /* Break string in two parts to avoid buggy C compilers that ignore characters
  37    after nulls in strings.  */
  38
  39 char string1[] = "Testing distribution of nonprinting chars:\n\
  40 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  41 Should be 0000: ";
  42
  43 char string2[] = ".\n\
  44 This file is read by the `test-distribution' program.\n\
  45 If you change it, you will make that program fail.\n";
  46
  47 char buf[300];
  48
  49 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  50 int
  51 cool_read (fd, buf, size)
  52      int fd;
  53      char *buf;
  54      int size;
  55 {
  56   int num, sofar = 0;
  57
  58   while (1)
  59     {
  60       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  61         return sofar;
  62       else if (num < 0)
  63         return num;
  64       sofar += num;
  65     }
  66 }
  67
  68 int
  69 main (argc, argv)
  70      int argc;
  71      char **argv;
  72 {
  73   int fd;
  74
  75   if (argc != 2)
  76     {
  77       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  78       exit (2);
  79     }
  80   fd = open (argv[1], O_RDONLY);
  81   if (fd < 0)
  82     {
  83       perror (argv[1]);
  84       exit (2);
  85     }
  86   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  87       strcmp (buf, string1) ||
  88       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  89       strncmp (buf, string2, sizeof string2 - 1))
  90     {
  91       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  92 Most likely this means that many nonprinting characters\n\
  93 have been corrupted in the files of Emacs, and it will not work.\n",
  94                argv[1]);
  95       exit (2);
  96     }
  97   close (fd);
  98 #ifdef VMS
  99   exit (1);                     /* On VMS, success is 1.  */
 100 #endif
 101   return (0);
 102 }