1  /* Regression test for fseek and freopen bugs.  */
       2  
       3  #include <stdio.h>
       4  #include <stdlib.h>
       5  #include <unistd.h>
       6  
       7  int
       8  main (int argc, char *argv[])
       9  {
      10    int lose = 0;
      11    char filename[] = "/tmp/bug7.XXXXXX";
      12    FILE *fp;
      13  
      14    int fd = mkstemp (filename);
      15    if (fd == -1)
      16      {
      17        printf ("mkstemp failed\n");
      18        lose = 1;
      19      }
      20    else
      21      {
      22        close (fd);
      23        fp = fopen (filename, "w+");
      24        fprintf (fp, "Hello world!\n");
      25        fflush (fp);
      26        fseek (fp, 5L, SEEK_SET);
      27        if (fseek (fp, -1L, SEEK_CUR) < 0)
      28  	{
      29  	  printf ("seek failed\n");
      30  	  lose = 1;
      31  	}
      32        fclose (fp);
      33        remove (filename);
      34      }
      35  
      36    {
      37      FILE *file1;
      38      FILE *file2;
      39      char filename1[] = "/tmp/bug7.XXXXXX";
      40      char filename2[] = "/tmp/bug7.XXXXXX";
      41      int ch;
      42  
      43      int fd1 = mkstemp (filename1);
      44      int fd2 = mkstemp (filename2);
      45      if (fd1 == -1 || fd2 == -1)
      46        {
      47  	printf ("mkstemp failed\n");
      48  	lose = 1;
      49        }
      50      else
      51        {
      52  	close (fd1);
      53  	close (fd2);
      54  
      55  	file1 = fopen (filename1, "w");
      56  	fclose (file1);
      57  
      58  	file2 = fopen (filename2, "w");
      59  	fputc ('x', file2);
      60  	fclose (file2);
      61  
      62  	file1 = fopen (filename1, "r");
      63  	file2 = freopen (filename2, "r", file1);
      64  	if ((ch = fgetc (file2)) != 'x')
      65  	  {
      66  	    printf ("wrong character in reopened file, value = %d\n", ch);
      67  	    lose = 1;
      68  	  }
      69  	fclose (file2);
      70  	remove (filename1);
      71  	remove (filename2);
      72        }
      73    }
      74  
      75    puts (lose ? "Test FAILED!" : "Test succeeded.");
      76    return lose;
      77  }