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04277e02 | 1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
33a934a3 | 2 | This file is part of the GNU C Library. |
34992338 | 3 | Contributed by Ulrich Drepper <drepper@gnu.org>, 1996. |
30de3b18 | 4 | |
33a934a3 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
30de3b18 | 9 | |
33a934a3 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
30de3b18 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
30de3b18 | 18 | |
91682d70 | 19 | #include <ctype.h> |
55985355 | 20 | #include <dlfcn.h> |
4bca4c17 | 21 | #include <gconv.h> |
30de3b18 | 22 | #include <stdio.h> |
4bca4c17 | 23 | #include <string.h> |
30de3b18 | 24 | #include <wchar.h> |
4bca4c17 | 25 | #include <wcsmbsload.h> |
34992338 | 26 | #include <limits.h> |
30de3b18 | 27 | |
915a6c51 UD |
28 | #include <sysdep.h> |
29 | ||
30de3b18 RM |
30 | |
31 | wint_t | |
9d46370c | 32 | __btowc (int c) |
30de3b18 | 33 | { |
96310297 | 34 | const struct gconv_fcts *fcts; |
4bca4c17 UD |
35 | |
36 | /* If the parameter does not fit into one byte or it is the EOF value | |
37 | we can give the answer now. */ | |
34992338 | 38 | if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF) |
4bca4c17 UD |
39 | return WEOF; |
40 | ||
91682d70 UD |
41 | /* We know that only ASCII compatible encodings are used for the |
42 | locale and that the wide character encoding is ISO 10646. */ | |
43 | if (isascii (c)) | |
44 | return (wint_t) c; | |
45 | ||
96310297 RM |
46 | /* Get the conversion functions. */ |
47 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
915a6c51 | 48 | __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct; |
1cf1232c PF |
49 | #ifdef PTR_DEMANGLE |
50 | if (fcts->towc->__shlib_handle != NULL) | |
51 | PTR_DEMANGLE (btowc_fct); | |
52 | #endif | |
4bca4c17 | 53 | |
f9ad060c | 54 | if (__builtin_expect (fcts->towc_nsteps == 1, 1) |
915a6c51 | 55 | && __builtin_expect (btowc_fct != NULL, 1)) |
f9ad060c UD |
56 | { |
57 | /* Use the shortcut function. */ | |
915a6c51 | 58 | return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c)); |
f9ad060c UD |
59 | } |
60 | else | |
61 | { | |
62 | /* Fall back to the slow but generic method. */ | |
63 | wchar_t result; | |
64 | struct __gconv_step_data data; | |
65 | unsigned char inbuf[1]; | |
66 | const unsigned char *inptr = inbuf; | |
67 | size_t dummy; | |
68 | int status; | |
69 | ||
70 | /* Tell where we want the result. */ | |
71 | data.__outbuf = (unsigned char *) &result; | |
72 | data.__outbufend = data.__outbuf + sizeof (wchar_t); | |
73 | data.__invocation_counter = 0; | |
74 | data.__internal_use = 1; | |
75 | data.__flags = __GCONV_IS_LAST; | |
76 | data.__statep = &data.__state; | |
f9ad060c UD |
77 | |
78 | /* Make sure we start in the initial state. */ | |
79 | memset (&data.__state, '\0', sizeof (mbstate_t)); | |
80 | ||
81 | /* Create the input string. */ | |
82 | inbuf[0] = c; | |
83 | ||
915a6c51 UD |
84 | __gconv_fct fct = fcts->towc->__fct; |
85 | #ifdef PTR_DEMANGLE | |
86 | if (fcts->towc->__shlib_handle != NULL) | |
87 | PTR_DEMANGLE (fct); | |
88 | #endif | |
89 | status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1, | |
90 | NULL, &dummy, 0, 1)); | |
4bca4c17 | 91 | |
f9ad060c UD |
92 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
93 | && status != __GCONV_EMPTY_INPUT) | |
94 | /* The conversion failed. */ | |
95 | result = WEOF; | |
4bca4c17 | 96 | |
f9ad060c UD |
97 | return result; |
98 | } | |
30de3b18 | 99 | } |
2ad4fab2 | 100 | weak_alias (__btowc, btowc) |