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2b778ceb | 1 | /* Copyright (C) 1996-2021 Free Software Foundation, Inc. |
33a934a3 | 2 | This file is part of the GNU C Library. |
036cc82f | 3 | |
33a934a3 | 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. | |
036cc82f | 8 | |
33a934a3 UD |
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. |
036cc82f | 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 | 21 | #include <gconv.h> |
036cc82f | 22 | #include <wchar.h> |
4bca4c17 UD |
23 | #include <wcsmbsload.h> |
24 | ||
915a6c51 | 25 | #include <sysdep.h> |
036cc82f RM |
26 | |
27 | #ifndef EILSEQ | |
4bca4c17 | 28 | # define EILSEQ EINVAL |
036cc82f RM |
29 | #endif |
30 | ||
31 | ||
4bca4c17 UD |
32 | /* This is the private state used if PS is NULL. */ |
33 | static mbstate_t state; | |
036cc82f RM |
34 | |
35 | /* This is a non-standard function but it is very useful in the | |
36 | implementation of stdio because we have to deal with unterminated | |
37 | buffers. At most NWC wide character will be converted. */ | |
38 | size_t | |
9dd346ff JM |
39 | __wcsnrtombs (char *dst, const wchar_t **src, size_t nwc, size_t len, |
40 | mbstate_t *ps) | |
036cc82f | 41 | { |
d64b6ad0 | 42 | struct __gconv_step_data data; |
8619129f | 43 | const wchar_t *srcend; |
4bca4c17 | 44 | int status; |
23f0c99c | 45 | size_t result; |
d64b6ad0 | 46 | struct __gconv_step *tomb; |
96310297 | 47 | const struct gconv_fcts *fcts; |
036cc82f | 48 | |
4bca4c17 | 49 | /* Tell where we want the result. */ |
d64b6ad0 UD |
50 | data.__invocation_counter = 0; |
51 | data.__internal_use = 1; | |
85830c4c | 52 | data.__flags = __GCONV_IS_LAST; |
d64b6ad0 | 53 | data.__statep = ps ?: &state; |
036cc82f | 54 | |
4bca4c17 UD |
55 | if (nwc == 0) |
56 | return 0; | |
8619129f | 57 | srcend = *src + __wcsnlen (*src, nwc - 1) + 1; |
036cc82f | 58 | |
96310297 RM |
59 | /* Get the conversion functions. */ |
60 | fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE)); | |
f4017d20 | 61 | |
d64b6ad0 | 62 | /* Get the structure with the function pointers. */ |
96310297 | 63 | tomb = fcts->tomb; |
915a6c51 UD |
64 | __gconv_fct fct = tomb->__fct; |
65 | #ifdef PTR_DEMANGLE | |
66 | if (tomb->__shlib_handle != NULL) | |
67 | PTR_DEMANGLE (fct); | |
68 | #endif | |
d64b6ad0 | 69 | |
4bca4c17 UD |
70 | /* We have to handle DST == NULL special. */ |
71 | if (dst == NULL) | |
72 | { | |
72098116 | 73 | mbstate_t temp_state; |
b117f744 | 74 | unsigned char buf[256]; /* Just an arbitrary value. */ |
9c7ff11a | 75 | const unsigned char *inbuf = (const unsigned char *) *src; |
23f0c99c | 76 | size_t dummy; |
f4017d20 | 77 | |
72098116 UD |
78 | temp_state = *data.__statep; |
79 | data.__statep = &temp_state; | |
80 | ||
23f0c99c | 81 | result = 0; |
d64b6ad0 | 82 | data.__outbufend = buf + sizeof (buf); |
036cc82f | 83 | |
4bca4c17 | 84 | do |
d079f321 | 85 | { |
d64b6ad0 | 86 | data.__outbuf = buf; |
d079f321 | 87 | |
915a6c51 UD |
88 | status = DL_CALL_FCT (fct, (tomb, &data, &inbuf, |
89 | (const unsigned char *) srcend, NULL, | |
90 | &dummy, 0, 1)); | |
23f0c99c UD |
91 | |
92 | /* Count the number of bytes. */ | |
d64b6ad0 | 93 | result += data.__outbuf - buf; |
d079f321 | 94 | } |
d64b6ad0 | 95 | while (status == __GCONV_FULL_OUTPUT); |
036cc82f | 96 | |
d64b6ad0 UD |
97 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
98 | && data.__outbuf[-1] == '\0') | |
4bca4c17 UD |
99 | /* Don't count the NUL character in. */ |
100 | --result; | |
101 | } | |
102 | else | |
103 | { | |
104 | /* This code is based on the safe assumption that all internal | |
105 | multi-byte encodings use the NUL byte only to mark the end | |
106 | of the string. */ | |
23f0c99c UD |
107 | size_t dummy; |
108 | ||
1c99f950 UD |
109 | data.__outbuf = (unsigned char *) dst; |
110 | data.__outbufend = (unsigned char *) dst + len; | |
4bca4c17 | 111 | |
915a6c51 UD |
112 | status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src, |
113 | (const unsigned char *) srcend, NULL, | |
114 | &dummy, 0, 1)); | |
23f0c99c UD |
115 | |
116 | /* Count the number of bytes. */ | |
d64b6ad0 | 117 | result = data.__outbuf - (unsigned char *) dst; |
4bca4c17 UD |
118 | |
119 | /* We have to determine whether the last character converted | |
120 | is the NUL character. */ | |
d64b6ad0 UD |
121 | if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT) |
122 | && data.__outbuf[-1] == '\0') | |
036cc82f | 123 | { |
d64b6ad0 UD |
124 | assert (data.__outbuf != (unsigned char *) dst); |
125 | assert (__mbsinit (data.__statep)); | |
036cc82f | 126 | *src = NULL; |
4bca4c17 | 127 | --result; |
036cc82f | 128 | } |
4bca4c17 | 129 | } |
036cc82f | 130 | |
4bca4c17 UD |
131 | /* There must not be any problems with the conversion but illegal input |
132 | characters. */ | |
d64b6ad0 UD |
133 | assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT |
134 | || status == __GCONV_ILLEGAL_INPUT | |
135 | || status == __GCONV_INCOMPLETE_INPUT | |
136 | || status == __GCONV_FULL_OUTPUT); | |
036cc82f | 137 | |
d64b6ad0 UD |
138 | if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT |
139 | && status != __GCONV_EMPTY_INPUT) | |
4bca4c17 UD |
140 | { |
141 | result = (size_t) -1; | |
142 | __set_errno (EILSEQ); | |
036cc82f RM |
143 | } |
144 | ||
4bca4c17 | 145 | return result; |
036cc82f RM |
146 | } |
147 | weak_alias (__wcsnrtombs, wcsnrtombs) |