lib-src/test-distrib.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4
   5 /* Cancel substitutions made by config.h for Emacs.  */
   6 #undef open
   7 #undef read
   8 #undef write
   9 #undef close
  10
  11 #include <stdio.h>
  12
  13 #ifndef O_RDONLY
  14 #define O_RDONLY 0
  15 #endif
  16
  17
  18 /* Break string in two parts to avoid buggy C compilers that ignore characters
  19    after nulls in strings.  */
  20
  21 char string1[] = "Testing distribution of nonprinting chars:\n\
  22 Should be 0177: \177 Should be 0377: \377 Should be 0212: \212.\n\
  23 Should be 0000: ";
  24
  25 char string2[] = ".\n\
  26 This file is read by the `test-distribution' program.\n\
  27 If you change it, you will make that program fail.\n";
  28
  29 char buf[300];
  30
  31 /* Like `read' but keeps trying until it gets SIZE bytes or reaches eof.  */
  32 int
  33 cool_read (fd, buf, size)
  34      int fd;
  35      char *buf;
  36      int size;
  37 {
  38   int num, sofar = 0;
  39
  40   while (1)
  41     {
  42       if ((num = read (fd, buf + sofar, size - sofar)) == 0)
  43         return sofar;
  44       else if (num < 0)
  45         return num;
  46       sofar += num;
  47     }
  48 }
  49
  50 int
  51 main (argc, argv)
  52      int argc;
  53      char **argv;
  54 {
  55   int fd;
  56
  57   if (argc != 2)
  58     {
  59       fprintf (stderr, "Usage: %s testfile\n", argv[0]);
  60       exit (2);
  61     }
  62   fd = open (argv[1], O_RDONLY);
  63   if (fd < 0)
  64     {
  65       perror (argv[1]);
  66       exit (2);
  67     }
  68   if (cool_read (fd, buf, sizeof string1) != sizeof string1 ||
  69       strcmp (buf, string1) ||
  70       cool_read (fd, buf, sizeof string2) != sizeof string2 - 1 ||
  71       strncmp (buf, string2, sizeof string2 - 1))
  72     {
  73       fprintf (stderr, "Data in file `%s' has been damaged.\n\
  74 Most likely this means that many nonprinting characters\n\
  75 have been corrupted in the files of Emacs, and it will not work.\n",
  76                argv[1]);
  77       exit (2);
  78     }
  79   close (fd);
  80 #ifdef VMS
  81   exit (1);                     /* On VMS, success is 1.  */
  82 #endif
  83   return (0);
  84 }