stdio-common/bug5.c

   1 /* If stdio is working correctly, after this is run infile and outfile
   2    will have the same contents.  If the bug (found in GNU C library 0.3)
   3    exhibits itself, outfile will be missing the 2nd through 1023rd
   4    characters.  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 #include <support/support.h>
  11
  12 static char buf[8192];
  13
  14 int
  15 main (void)
  16 {
  17   FILE *in;
  18   FILE *out;
  19   static char inname[] = OBJPFX "bug5test.in";
  20   static char outname[] = OBJPFX "bug5test.out";
  21   char *printbuf;
  22   size_t i;
  23   int result;
  24
  25   /* Create a test file.  */
  26   in = fopen (inname, "w+");
  27   if (in == NULL)
  28     {
  29       perror (inname);
  30       return 1;
  31     }
  32   for (i = 0; i < 1000; ++i)
  33     fprintf (in, "%Zu\n", i);
  34
  35   out = fopen (outname, "w");
  36   if (out == NULL)
  37     {
  38       perror (outname);
  39       return 1;
  40     }
  41   if (fseek (in, 0L, SEEK_SET) != 0)
  42     abort ();
  43   putc (getc (in), out);
  44   i = fread (buf, 1, sizeof (buf), in);
  45   if (i == 0)
  46     {
  47       perror ("fread");
  48       return 1;
  49     }
  50   if (fwrite (buf, 1, i, out) != i)
  51     {
  52       perror ("fwrite");
  53       return 1;
  54     }
  55   fclose (in);
  56   fclose (out);
  57
  58   puts ("There should be no further output from this test.");
  59   fflush (stdout);
  60
  61   /* We must remove this entry to assure the `cmp' binary does not use
  62      the perhaps incompatible new shared libraries.  */
  63   unsetenv ("LD_LIBRARY_PATH");
  64
  65   printbuf = xasprintf ("cmp %s %s", inname, outname);
  66   result = system (printbuf);
  67   remove (inname);
  68   remove (outname);
  69
  70   exit ((result != 0));
  71 }