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91682d70 | 1 | /* Copyright (C) 1996-2000,2002,2005 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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
30de3b18 | 19 | |
91682d70 | 20 | #include <ctype.h> |
55985355 | 21 | #include <dlfcn.h> |
4bca4c17 | 22 | #include <gconv.h> |
30de3b18 | 23 | #include <stdio.h> |
4bca4c17 | 24 | #include <string.h> |
30de3b18 | 25 | #include <wchar.h> |
4bca4c17 | 26 | #include <wcsmbsload.h> |
34992338 | 27 | #include <limits.h> |
30de3b18 RM |
28 | |
29 | ||
30 | wint_t | |
2ad4fab2 | 31 | __btowc (c) |
30de3b18 RM |
32 | int c; |
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)); | |
4bca4c17 | 48 | |
f9ad060c | 49 | if (__builtin_expect (fcts->towc_nsteps == 1, 1) |
a334319f | 50 | && __builtin_expect (fcts->towc->__btowc_fct != NULL, 1)) |
f9ad060c UD |
51 | { |
52 | /* Use the shortcut function. */ | |
a334319f UD |
53 | return DL_CALL_FCT (fcts->towc->__btowc_fct, |
54 | (fcts->towc, (unsigned char) c)); | |
f9ad060c UD |
55 | } |
56 | else | |
57 | { | |
58 | /* Fall back to the slow but generic method. */ | |
59 | wchar_t result; | |
60 | struct __gconv_step_data data; | |
61 | unsigned char inbuf[1]; | |
62 | const unsigned char *inptr = inbuf; | |
63 | size_t dummy; | |
64 | int status; | |
65 | ||
66 | /* Tell where we want the result. */ | |
67 | data.__outbuf = (unsigned char *) &result; | |
68 | data.__outbufend = data.__outbuf + sizeof (wchar_t); | |
69 | data.__invocation_counter = 0; | |
70 | data.__internal_use = 1; | |
71 | data.__flags = __GCONV_IS_LAST; | |
72 | data.__statep = &data.__state; | |
73 | data.__trans = NULL; | |
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 | ||
a334319f UD |
81 | status = DL_CALL_FCT (fcts->towc->__fct, |
82 | (fcts->towc, &data, &inptr, inptr + 1, | |
83 | NULL, &dummy, 0, 1)); | |
4bca4c17 | 84 | |
f9ad060c UD |
85 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
86 | && status != __GCONV_EMPTY_INPUT) | |
87 | /* The conversion failed. */ | |
88 | result = WEOF; | |
4bca4c17 | 89 | |
f9ad060c UD |
90 | return result; |
91 | } | |
30de3b18 | 92 | } |
2ad4fab2 | 93 | weak_alias (__btowc, btowc) |