lib-src/test-distrib.c

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