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[glibc/history.git] / libio / bug-ungetwc1.c
blob8ed6acd175e8685892c5cc01de1d444f7914289a
1 #define _XOPEN_SOURCE 500
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <locale.h>
5 #include <wchar.h>
7 const char write_chars[] = "ABC"; /* Characters on testfile. */
8 const wint_t unget_wchar = L'A'; /* Ungotten wide character. */
10 char *fname;
13 static int do_test (void);
14 #define TEST_FUNCTION do_test ()
16 #include "../test-skeleton.c"
19 static int
20 do_test (void)
22 wint_t wc;
23 FILE *fp;
24 int fd;
26 fname = (char *) malloc (strlen (test_dir) + sizeof "/bug-ungetwc1.XXXXXX");
27 if (fname == NULL)
29 puts ("no memory");
30 return 1;
32 strcpy (stpcpy (fname, test_dir), "/bug-ungetwc1.XXXXXX");
33 fd = mkstemp (fname);
34 if (fd == -1)
36 printf ("cannot open temporary file: %m\n");
37 return 1;
39 add_temp_file (fname);
41 setlocale(LC_ALL, "");
43 /* Output to the file. */
44 if ((fp = fdopen (fd, "w")) == NULL)
46 fprintf (stderr, "Cannot make `%s' file\n", fname);
47 exit (EXIT_FAILURE);
50 fprintf (fp, "%s", write_chars);
51 fclose (fp);
53 /* Read from the file. */
54 fp = fopen (fname, "r");
56 while (!feof (fp))
57 wc = getwc (fp);
58 printf ("\nThe end-of-file indicator is set.\n");
60 /* Unget a wide character. */
61 ungetwc (unget_wchar, fp);
62 printf ("< `%lc' is ungotten.\n", unget_wchar);
64 /* Check the end-of-file indicator. */
65 if (feof (fp))
66 printf ("The end-of-file indicator is still set.\n");
67 else
68 printf ("The end-of-file flag is cleared.\n");
70 fflush (stdout);
71 fclose (fp);
73 return 0;