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 static char buf[8192];
  11
  12 int
  13 main (void)
  14 {
  15   FILE *in;
  16   FILE *out;
  17   static char inname[] = "/tmp/bug5.in";
  18   static char outname[] = "/tmp/bug5.out";
  19   char *printbuf;
  20   size_t i;
  21   int result;
  22
  23   /* Create a test file.  */
  24   in = fopen (inname, "w+");
  25   if (in == NULL)
  26     {
  27       perror (inname);
  28       return 1;
  29     }
  30   for (i = 0; i < 1000; ++i)
  31     fprintf (in, "%Zu\n", i);
  32
  33   out = fopen (outname, "w");
  34   if (out == NULL)
  35     {
  36       perror (outname);
  37       return 1;
  38     }
  39   if (fseek (in, 0L, SEEK_SET) != 0)
  40     abort ();
  41   putc (getc (in), out);
  42   i = fread (buf, 1, sizeof (buf), in);
  43   if (i == 0)
  44     {
  45       perror ("fread");
  46       return 1;
  47     }
  48   if (fwrite (buf, 1, i, out) != i)
  49     {
  50       perror ("fwrite");
  51       return 1;
  52     }
  53   fclose (in);
  54   fclose (out);
  55
  56   puts ("There should be no further output from this test.");
  57   fflush (stdout);
  58
  59   /* We must remove this entry to assure the `cmp' binary does not use
  60      the perhaps incompatible new shared libraries.  */
  61   unsetenv ("LD_LIBRARY_PATH");
  62
  63   asprintf (&printbuf, "cmp %s %s", inname, outname);
  64   result = system (printbuf);
  65   remove (inname);
  66   remove (outname);
  67
  68   exit ((result != 0));
  69 }