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dff8da6b | 1 | /* Copyright (C) 1996-2024 Free Software Foundation, Inc. |
33a934a3 | 2 | This file is part of the GNU C Library. |
30de3b18 | 3 | |
33a934a3 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
30de3b18 | 8 | |
33a934a3 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
30de3b18 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
30de3b18 | 17 | |
91682d70 | 18 | #include <ctype.h> |
55985355 | 19 | #include <dlfcn.h> |
4bca4c17 | 20 | #include <gconv.h> |
30de3b18 | 21 | #include <stdio.h> |
4bca4c17 | 22 | #include <string.h> |
30de3b18 | 23 | #include <wchar.h> |
4bca4c17 | 24 | #include <wcsmbsload.h> |
34992338 | 25 | #include <limits.h> |
30de3b18 | 26 | |
88f4b692 | 27 | #include <pointer_guard.h> |
915a6c51 | 28 | |
30de3b18 RM |
29 | |
30 | wint_t | |
9d46370c | 31 | __btowc (int c) |
30de3b18 | 32 | { |
96310297 | 33 | const struct gconv_fcts *fcts; |
4bca4c17 UD |
34 | |
35 | /* If the parameter does not fit into one byte or it is the EOF value | |
36 | we can give the answer now. */ | |
34992338 | 37 | if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF) |
4bca4c17 UD |
38 | return WEOF; |
39 | ||
91682d70 UD |
40 | /* We know that only ASCII compatible encodings are used for the |
41 | locale and that the wide character encoding is ISO 10646. */ | |
42 | if (isascii (c)) | |
43 | return (wint_t) c; | |
44 | ||
96310297 RM |
45 | /* Get the conversion functions. */ |
46 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
915a6c51 | 47 | __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct; |
1cf1232c PF |
48 | if (fcts->towc->__shlib_handle != NULL) |
49 | PTR_DEMANGLE (btowc_fct); | |
4bca4c17 | 50 | |
f9ad060c | 51 | if (__builtin_expect (fcts->towc_nsteps == 1, 1) |
915a6c51 | 52 | && __builtin_expect (btowc_fct != NULL, 1)) |
f9ad060c UD |
53 | { |
54 | /* Use the shortcut function. */ | |
915a6c51 | 55 | return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c)); |
f9ad060c UD |
56 | } |
57 | else | |
58 | { | |
59 | /* Fall back to the slow but generic method. */ | |
60 | wchar_t result; | |
61 | struct __gconv_step_data data; | |
62 | unsigned char inbuf[1]; | |
63 | const unsigned char *inptr = inbuf; | |
64 | size_t dummy; | |
65 | int status; | |
66 | ||
67 | /* Tell where we want the result. */ | |
68 | data.__outbuf = (unsigned char *) &result; | |
69 | data.__outbufend = data.__outbuf + sizeof (wchar_t); | |
70 | data.__invocation_counter = 0; | |
71 | data.__internal_use = 1; | |
72 | data.__flags = __GCONV_IS_LAST; | |
73 | data.__statep = &data.__state; | |
f9ad060c UD |
74 | |
75 | /* Make sure we start in the initial state. */ | |
76 | memset (&data.__state, '\0', sizeof (mbstate_t)); | |
77 | ||
78 | /* Create the input string. */ | |
79 | inbuf[0] = c; | |
80 | ||
915a6c51 | 81 | __gconv_fct fct = fcts->towc->__fct; |
915a6c51 UD |
82 | if (fcts->towc->__shlib_handle != NULL) |
83 | PTR_DEMANGLE (fct); | |
915a6c51 UD |
84 | status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1, |
85 | NULL, &dummy, 0, 1)); | |
4bca4c17 | 86 | |
f9ad060c UD |
87 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
88 | && status != __GCONV_EMPTY_INPUT) | |
89 | /* The conversion failed. */ | |
90 | result = WEOF; | |
4bca4c17 | 91 | |
f9ad060c UD |
92 | return result; |
93 | } | |
30de3b18 | 94 | } |
2ad4fab2 | 95 | weak_alias (__btowc, btowc) |