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  }