+ fputs ("Failed to read next byte after fseek.\n", stderr);
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ /* For deterministic results, ensure f read a bigger buffer. */
+ if (lseek (fd, 0, SEEK_CUR) == 6)
+ {
+ fputs ("Sample file was not buffered after fgetc.\n", stderr);
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ /* POSIX requires fflush-fseeko to set file offset of fd. */
+ if (fflush (f) != 0 || fseeko (f, 0, SEEK_CUR) != 0)
+ {
+ fputs ("Failed to flush-fseeko sample file.\n", stderr);
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ /* Check that offset is correct. */
+ if (lseek (fd, 0, SEEK_CUR) != 6)
+ {
+ fprintf (stderr, "File offset is wrong after fseeko: %ld.\n",
+ (long) lseek (fd, 0, SEEK_CUR));
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ if (ftell (f) != 6)
+ {
+ fprintf (stderr, "ftell result is wrong after fseeko: %ld.\n",
+ (long) ftell (f));
+ fclose (f);
+ unlink ("test-fflush.txt");
+ return 1;
+ }
+ /* Check that file reading resumes at correct location. */
+ if (fgetc (f) != '7')
+ {
+ fputs ("Failed to read next byte after fseeko.\n", stderr);