xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1996-2016 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 <assert.h> |
| 20 | #include <dlfcn.h> |
| 21 | #include <errno.h> |
| 22 | #include <gconv.h> |
| 23 | #include <string.h> |
| 24 | #include <wchar.h> |
| 25 | #include <wcsmbsload.h> |
| 26 | |
| 27 | #include <sysdep.h> |
| 28 | |
| 29 | #ifndef EILSEQ |
| 30 | # define EILSEQ EINVAL |
| 31 | #endif |
| 32 | |
| 33 | |
| 34 | /* This is the private state used if PS is NULL. */ |
| 35 | static mbstate_t state; |
| 36 | |
| 37 | /* This is a non-standard function but it is very useful in the |
| 38 | implementation of stdio because we have to deal with unterminated |
| 39 | buffers. At most NMC bytes will be converted. */ |
| 40 | size_t |
| 41 | __mbsnrtowcs (wchar_t *dst, const char **src, size_t nmc, size_t len, |
| 42 | mbstate_t *ps) |
| 43 | { |
| 44 | const unsigned char *srcend; |
| 45 | struct __gconv_step_data data; |
| 46 | size_t result; |
| 47 | int status; |
| 48 | struct __gconv_step *towc; |
| 49 | size_t dummy; |
| 50 | const struct gconv_fcts *fcts; |
| 51 | |
| 52 | /* Tell where we want the result. */ |
| 53 | data.__invocation_counter = 0; |
| 54 | data.__internal_use = 1; |
| 55 | data.__flags = __GCONV_IS_LAST; |
| 56 | data.__statep = ps ?: &state; |
| 57 | |
| 58 | if (nmc == 0) |
| 59 | return 0; |
| 60 | srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1; |
| 61 | |
| 62 | /* Get the conversion functions. */ |
| 63 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); |
| 64 | |
| 65 | /* Get the structure with the function pointers. */ |
| 66 | towc = fcts->towc; |
| 67 | __gconv_fct fct = towc->__fct; |
| 68 | #ifdef PTR_DEMANGLE |
| 69 | if (towc->__shlib_handle != NULL) |
| 70 | PTR_DEMANGLE (fct); |
| 71 | #endif |
| 72 | |
| 73 | /* We have to handle DST == NULL special. */ |
| 74 | if (dst == NULL) |
| 75 | { |
| 76 | mbstate_t temp_state; |
| 77 | wchar_t buf[64]; /* Just an arbitrary size. */ |
| 78 | const unsigned char *inbuf = (const unsigned char *) *src; |
| 79 | |
| 80 | temp_state = *data.__statep; |
| 81 | data.__statep = &temp_state; |
| 82 | |
| 83 | result = 0; |
| 84 | data.__outbufend = (unsigned char *) buf + sizeof (buf); |
| 85 | do |
| 86 | { |
| 87 | data.__outbuf = (unsigned char *) buf; |
| 88 | |
| 89 | status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL, |
| 90 | &dummy, 0, 1)); |
| 91 | |
| 92 | result += (wchar_t *) data.__outbuf - buf; |
| 93 | } |
| 94 | while (status == __GCONV_FULL_OUTPUT); |
| 95 | |
| 96 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
| 97 | && ((wchar_t *) data.__outbuf)[-1] == L'\0') |
| 98 | /* Don't count the NUL character in. */ |
| 99 | --result; |
| 100 | } |
| 101 | else |
| 102 | { |
| 103 | /* This code is based on the safe assumption that all internal |
| 104 | multi-byte encodings use the NUL byte only to mark the end |
| 105 | of the string. */ |
| 106 | data.__outbuf = (unsigned char *) dst; |
| 107 | data.__outbufend = data.__outbuf + len * sizeof (wchar_t); |
| 108 | |
| 109 | status = DL_CALL_FCT (fct, |
| 110 | (towc, &data, (const unsigned char **) src, srcend, |
| 111 | NULL, &dummy, 0, 1)); |
| 112 | |
| 113 | result = (wchar_t *) data.__outbuf - dst; |
| 114 | |
| 115 | /* We have to determine whether the last character converted |
| 116 | is the NUL character. */ |
| 117 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
| 118 | && (assert (result > 0), |
| 119 | ((wchar_t *) dst)[result - 1] == L'\0')) |
| 120 | { |
| 121 | assert (__mbsinit (data.__statep)); |
| 122 | *src = NULL; |
| 123 | --result; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /* There must not be any problems with the conversion but illegal input |
| 128 | characters. */ |
| 129 | assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT |
| 130 | || status == __GCONV_ILLEGAL_INPUT |
| 131 | || status == __GCONV_INCOMPLETE_INPUT |
| 132 | || status == __GCONV_FULL_OUTPUT); |
| 133 | |
| 134 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
| 135 | && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT) |
| 136 | { |
| 137 | result = (size_t) -1; |
| 138 | __set_errno (EILSEQ); |
| 139 | } |
| 140 | |
| 141 | return result; |
| 142 | } |
| 143 | weak_alias (__mbsnrtowcs, mbsnrtowcs) |