lib-src/test-distrib.c

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