1#define _XOPEN_SOURCE 500
2#include <errno.h>
3#include <error.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <locale.h>
7#include <wchar.h>
8
9const char test_locale[] = "de_DE.UTF-8";
10const wchar_t write_wchars[] = {L'A', 0x00C4, L'B', L'\0'};
11 /* `0x00C4' is A with diaeresis. */
12size_t last_pos = 2; /* Which character is last one to read. */
13wint_t unget_wchar = L'C'; /* Ungotten ide characters. */
14
15char *fname;
16
17
18static int do_test (void);
19#define TEST_FUNCTION do_test ()
20
21#include "../test-skeleton.c"
22
23
24static int
25do_test (void)
26{
27 size_t i;
28 wint_t wc;
29 FILE *fp;
30 int fd;
31
32 fname = (char *) malloc (size: strlen (test_dir) + sizeof "/bug-ungetwc2.XXXXXX");
33 if (fname == NULL)
34 {
35 puts (s: "no memory");
36 return 1;
37 }
38 strcpy (stpcpy (fname, test_dir), "/bug-ungetwc2.XXXXXX");
39 fd = mkstemp (template: fname);
40 if (fd == -1)
41 {
42 printf (format: "cannot open temporary file: %m\n");
43 return 1;
44 }
45 add_temp_file (name: fname);
46
47 printf (format: "\nNote: This program runs on %s locale.\n\n", test_locale);
48
49 if (setlocale (LC_ALL, test_locale) == NULL)
50 {
51 fprintf (stderr, "Cannot use `%s' locale.\n", test_locale);
52 exit (EXIT_FAILURE);
53 }
54
55 /* Output to the file. */
56 if ((fp = fdopen (fd, "w")) == NULL)
57 {
58 setlocale (LC_ALL, "C");
59 fprintf (stderr, "Cannot make `%s' file.\n", fname);
60 exit (EXIT_FAILURE);
61 }
62 fprintf (fp, "%ls", write_wchars);
63 fclose (fp);
64
65 /* Read from the file. */
66 fp = fopen (fname, "r");
67 if (fp == NULL)
68 {
69 setlocale (LC_ALL, "C");
70 error (EXIT_FAILURE, errno, format: "cannot open %s", fname);
71 }
72
73 printf (format: "%s is opened.\n", fname);
74
75 for (i = 0; i < last_pos; i++)
76 {
77 wc = getwc (stream: fp);
78 printf (format: "> `%lc' is gotten.\n", wc);
79 }
80
81 /* Unget a wide character. */
82 ungetwc (wc: unget_wchar, stream: fp);
83 printf (format: "< `%lc' is ungotten.\n", unget_wchar);
84
85 /* Reget the wide character. */
86 wc = getwc (stream: fp);
87 printf (format: "> `%lc' is regotten.\n", wc);
88
89 fflush (stdout);
90 fclose (fp);
91
92 return 0;
93}
94

source code of glibc/libio/bug-ungetwc2.c