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6d7e8eda | 1 | /* Copyright (C) 1996-2023 Free Software Foundation, Inc. |
33a934a3 | 2 | This file is part of the GNU C Library. |
33a934a3 UD |
3 | |
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. | |
33a934a3 UD |
8 | |
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. |
33a934a3 | 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/>. */ |
036cc82f | 17 | |
915a6c51 | 18 | #include <assert.h> |
55985355 | 19 | #include <dlfcn.h> |
036cc82f | 20 | #include <errno.h> |
4bca4c17 UD |
21 | #include <gconv.h> |
22 | #include <string.h> | |
036cc82f | 23 | #include <wchar.h> |
4bca4c17 UD |
24 | #include <wcsmbsload.h> |
25 | ||
88f4b692 | 26 | #include <pointer_guard.h> |
036cc82f RM |
27 | |
28 | #ifndef EILSEQ | |
4bca4c17 | 29 | # define EILSEQ EINVAL |
036cc82f RM |
30 | #endif |
31 | ||
32 | ||
4bca4c17 UD |
33 | /* This is the private state used if PS is NULL. */ |
34 | static mbstate_t state; | |
036cc82f RM |
35 | |
36 | /* This is a non-standard function but it is very useful in the | |
37 | implementation of stdio because we have to deal with unterminated | |
38 | buffers. At most NMC bytes will be converted. */ | |
39 | size_t | |
9dd346ff JM |
40 | __mbsnrtowcs (wchar_t *dst, const char **src, size_t nmc, size_t len, |
41 | mbstate_t *ps) | |
036cc82f | 42 | { |
b117f744 | 43 | const unsigned char *srcend; |
d64b6ad0 | 44 | struct __gconv_step_data data; |
1da6cab2 | 45 | size_t result; |
4bca4c17 | 46 | int status; |
d64b6ad0 | 47 | struct __gconv_step *towc; |
55985355 | 48 | size_t dummy; |
96310297 | 49 | const struct gconv_fcts *fcts; |
036cc82f | 50 | |
4bca4c17 | 51 | /* Tell where we want the result. */ |
d64b6ad0 UD |
52 | data.__invocation_counter = 0; |
53 | data.__internal_use = 1; | |
85830c4c | 54 | data.__flags = __GCONV_IS_LAST; |
d64b6ad0 | 55 | data.__statep = ps ?: &state; |
036cc82f | 56 | |
4bca4c17 UD |
57 | if (nmc == 0) |
58 | return 0; | |
1c99f950 | 59 | srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1; |
f4017d20 | 60 | |
96310297 RM |
61 | /* Get the conversion functions. */ |
62 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
036cc82f | 63 | |
d64b6ad0 | 64 | /* Get the structure with the function pointers. */ |
96310297 | 65 | towc = fcts->towc; |
915a6c51 | 66 | __gconv_fct fct = towc->__fct; |
915a6c51 UD |
67 | if (towc->__shlib_handle != NULL) |
68 | PTR_DEMANGLE (fct); | |
d64b6ad0 | 69 | |
4bca4c17 UD |
70 | /* We have to handle DST == NULL special. */ |
71 | if (dst == NULL) | |
036cc82f | 72 | { |
bf93cd3b | 73 | mbstate_t temp_state; |
4bca4c17 | 74 | wchar_t buf[64]; /* Just an arbitrary size. */ |
1c99f950 | 75 | const unsigned char *inbuf = (const unsigned char *) *src; |
4bca4c17 | 76 | |
bf93cd3b UD |
77 | temp_state = *data.__statep; |
78 | data.__statep = &temp_state; | |
79 | ||
1da6cab2 UD |
80 | result = 0; |
81 | data.__outbufend = (unsigned char *) buf + sizeof (buf); | |
4bca4c17 | 82 | do |
d079f321 | 83 | { |
1da6cab2 | 84 | data.__outbuf = (unsigned char *) buf; |
d079f321 | 85 | |
915a6c51 UD |
86 | status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL, |
87 | &dummy, 0, 1)); | |
1da6cab2 UD |
88 | |
89 | result += (wchar_t *) data.__outbuf - buf; | |
d079f321 | 90 | } |
d64b6ad0 | 91 | while (status == __GCONV_FULL_OUTPUT); |
f4017d20 | 92 | |
d64b6ad0 UD |
93 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
94 | && ((wchar_t *) data.__outbuf)[-1] == L'\0') | |
4bca4c17 UD |
95 | /* Don't count the NUL character in. */ |
96 | --result; | |
97 | } | |
98 | else | |
99 | { | |
100 | /* This code is based on the safe assumption that all internal | |
101 | multi-byte encodings use the NUL byte only to mark the end | |
102 | of the string. */ | |
d64b6ad0 UD |
103 | data.__outbuf = (unsigned char *) dst; |
104 | data.__outbufend = data.__outbuf + len * sizeof (wchar_t); | |
4bca4c17 | 105 | |
915a6c51 | 106 | status = DL_CALL_FCT (fct, |
55985355 | 107 | (towc, &data, (const unsigned char **) src, srcend, |
f1d5c60d | 108 | NULL, &dummy, 0, 1)); |
1da6cab2 UD |
109 | |
110 | result = (wchar_t *) data.__outbuf - dst; | |
4bca4c17 UD |
111 | |
112 | /* We have to determine whether the last character converted | |
113 | is the NUL character. */ | |
d64b6ad0 | 114 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
1da6cab2 UD |
115 | && (assert (result > 0), |
116 | ((wchar_t *) dst)[result - 1] == L'\0')) | |
036cc82f | 117 | { |
d64b6ad0 | 118 | assert (__mbsinit (data.__statep)); |
036cc82f | 119 | *src = NULL; |
4bca4c17 | 120 | --result; |
036cc82f | 121 | } |
036cc82f RM |
122 | } |
123 | ||
4bca4c17 UD |
124 | /* There must not be any problems with the conversion but illegal input |
125 | characters. */ | |
1da6cab2 | 126 | assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT |
d64b6ad0 UD |
127 | || status == __GCONV_ILLEGAL_INPUT |
128 | || status == __GCONV_INCOMPLETE_INPUT | |
129 | || status == __GCONV_FULL_OUTPUT); | |
4bca4c17 | 130 | |
d64b6ad0 | 131 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
1da6cab2 | 132 | && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT) |
4bca4c17 UD |
133 | { |
134 | result = (size_t) -1; | |
135 | __set_errno (EILSEQ); | |
136 | } | |
036cc82f | 137 | |
4bca4c17 | 138 | return result; |
036cc82f RM |
139 | } |
140 | weak_alias (__mbsnrtowcs, mbsnrtowcs) |