stdio-common/bug7.c

   1 /* Regression test for fseek and freopen bugs.  */
   2
   3 #include <stdio.h>
   4
   5 int
   6 main ()
   7 {
   8   int lose = 0;
   9   char filename[] = "/tmp/foo";
  10   FILE *fp;
  11
  12   fp = fopen (filename, "w+");
  13   fprintf (fp, "Hello world!\n");
  14   fflush (fp);
  15   fseek (fp, 5L, SEEK_SET);
  16   if (fseek (fp, -1L, SEEK_CUR) < 0)
  17     {
  18       printf ("seek failed\n");
  19       lose = 1;
  20     }
  21   fclose (fp);
  22   remove (filename);
  23
  24   {
  25     FILE *file1;
  26     FILE *file2;
  27     char filename1[] = "/tmp/foo";
  28     char filename2[] = "/tmp/bar";
  29     int ch;
  30
  31     file1 = fopen (filename1, "w");
  32     fclose (file1);
  33
  34     file2 = fopen (filename2, "w");
  35     fputc ('x', file2);
  36     fclose (file2);
  37
  38     file1 = fopen (filename1, "r");
  39     file2 = freopen (filename2, "r", file1);
  40     if ((ch = fgetc (file2)) != 'x')
  41       {
  42         printf ("wrong character in reopened file, value = %d\n", ch);
  43         lose = 1;
  44       }
  45     fclose (file1);
  46     fclose (file2);
  47     remove (filename1);
  48     remove (filename2);
  49   }
  50
  51   puts (lose ? "Test FAILED!" : "Test succeeded.");
  52   return lose;
  53 }