stdio-common/bug7.c

   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 }