1 | /* Copyright (C) 1996-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <dlfcn.h> |
19 | #include <gconv.h> |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | #include <wchar.h> |
23 | #include <wcsmbsload.h> |
24 | |
25 | #include <pointer_guard.h> |
26 | |
27 | |
28 | int |
29 | wctob (wint_t c) |
30 | { |
31 | unsigned char buf[MB_LEN_MAX]; |
32 | struct __gconv_step_data data; |
33 | wchar_t inbuf[1]; |
34 | wchar_t *inptr = inbuf; |
35 | size_t dummy; |
36 | int status; |
37 | const struct gconv_fcts *fcts; |
38 | |
39 | if (c == WEOF) |
40 | return EOF; |
41 | |
42 | /* We know that only ASCII compatible encodings are used for the |
43 | locale and that the wide character encoding is ISO 10646. */ |
44 | if (c >= L'\0' && c <= L'\x7f') |
45 | return (int) c; |
46 | |
47 | /* Tell where we want the result. */ |
48 | data.__outbuf = buf; |
49 | data.__outbufend = buf + MB_LEN_MAX; |
50 | data.__invocation_counter = 0; |
51 | data.__internal_use = 1; |
52 | data.__flags = __GCONV_IS_LAST; |
53 | data.__statep = &data.__state; |
54 | |
55 | /* Make sure we start in the initial state. */ |
56 | memset (&data.__state, '\0', sizeof (mbstate_t)); |
57 | |
58 | /* Get the conversion functions. */ |
59 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
60 | |
61 | /* Create the input string. */ |
62 | inbuf[0] = c; |
63 | |
64 | const unsigned char *argptr = (const unsigned char *) inptr; |
65 | __gconv_fct fct = fcts->tomb->__fct; |
66 | if (fcts->tomb->__shlib_handle != NULL) |
67 | PTR_DEMANGLE (fct); |
68 | status = DL_CALL_FCT (fct, |
69 | (fcts->tomb, &data, &argptr, |
70 | argptr + sizeof (inbuf[0]), NULL, &dummy, 0, 1)); |
71 | |
72 | /* The conversion failed or the output is too long. */ |
73 | if ((status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
74 | && status != __GCONV_EMPTY_INPUT) |
75 | || data.__outbuf != (unsigned char *) (buf + 1)) |
76 | return EOF; |
77 | |
78 | return buf[0]; |
79 | } |
80 | |