| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1996-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@gnu.org>, 1996. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 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. |
| 9 | |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <ctype.h> |
| 20 | #include <dlfcn.h> |
| 21 | #include <gconv.h> |
| 22 | #include <stdio.h> |
| 23 | #include <string.h> |
| 24 | #include <wchar.h> |
| 25 | #include <wcsmbsload.h> |
| 26 | #include <limits.h> |
| 27 | |
| 28 | #include <sysdep.h> |
| 29 | |
| 30 | |
| 31 | wint_t |
| 32 | __btowc (c) |
| 33 | int c; |
| 34 | { |
| 35 | const struct gconv_fcts *fcts; |
| 36 | |
| 37 | /* If the parameter does not fit into one byte or it is the EOF value |
| 38 | we can give the answer now. */ |
| 39 | if (c < SCHAR_MIN || c > UCHAR_MAX || c == EOF) |
| 40 | return WEOF; |
| 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 (isascii (c)) |
| 45 | return (wint_t) c; |
| 46 | |
| 47 | /* Get the conversion functions. */ |
| 48 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
| 49 | __gconv_btowc_fct btowc_fct = fcts->towc->__btowc_fct; |
| 50 | |
| 51 | if (__builtin_expect (fcts->towc_nsteps == 1, 1) |
| 52 | && __builtin_expect (btowc_fct != NULL, 1)) |
| 53 | { |
| 54 | /* Use the shortcut function. */ |
| 55 | #ifdef PTR_DEMANGLE |
| 56 | if (fcts->towc->__shlib_handle != NULL) |
| 57 | PTR_DEMANGLE (btowc_fct); |
| 58 | #endif |
| 59 | return DL_CALL_FCT (btowc_fct, (fcts->towc, (unsigned char) c)); |
| 60 | } |
| 61 | else |
| 62 | { |
| 63 | /* Fall back to the slow but generic method. */ |
| 64 | wchar_t result; |
| 65 | struct __gconv_step_data data; |
| 66 | unsigned char inbuf[1]; |
| 67 | const unsigned char *inptr = inbuf; |
| 68 | size_t dummy; |
| 69 | int status; |
| 70 | |
| 71 | /* Tell where we want the result. */ |
| 72 | data.__outbuf = (unsigned char *) &result; |
| 73 | data.__outbufend = data.__outbuf + sizeof (wchar_t); |
| 74 | data.__invocation_counter = 0; |
| 75 | data.__internal_use = 1; |
| 76 | data.__flags = __GCONV_IS_LAST; |
| 77 | data.__statep = &data.__state; |
| 78 | |
| 79 | /* Make sure we start in the initial state. */ |
| 80 | memset (&data.__state, '\0', sizeof (mbstate_t)); |
| 81 | |
| 82 | /* Create the input string. */ |
| 83 | inbuf[0] = c; |
| 84 | |
| 85 | __gconv_fct fct = fcts->towc->__fct; |
| 86 | #ifdef PTR_DEMANGLE |
| 87 | if (fcts->towc->__shlib_handle != NULL) |
| 88 | PTR_DEMANGLE (fct); |
| 89 | #endif |
| 90 | status = DL_CALL_FCT (fct, (fcts->towc, &data, &inptr, inptr + 1, |
| 91 | NULL, &dummy, 0, 1)); |
| 92 | |
| 93 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
| 94 | && status != __GCONV_EMPTY_INPUT) |
| 95 | /* The conversion failed. */ |
| 96 | result = WEOF; |
| 97 | |
| 98 | return result; |
| 99 | } |
| 100 | } |
| 101 | weak_alias (__btowc, btowc) |