stdio-common/bug7.c

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