1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
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.
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
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <assert.h>
19 #include <dlfcn.h>
20 #include <errno.h>
21 #include <stdlib.h>
22 #include <gconv.h>
23 #include <wchar.h>
24 #include <wcsmbsload.h>
25
26 #include <sysdep.h>
27
28 #ifndef EILSEQ
29 # define EILSEQ EINVAL
30 #endif
31
32
33 /* This is the private state used if PS is NULL. */
34 static mbstate_t state;
35
36 size_t
__wcsrtombs(char * dst,const wchar_t ** src,size_t len,mbstate_t * ps)37 __wcsrtombs (char *dst, const wchar_t **src, size_t len, mbstate_t *ps)
38 {
39 struct __gconv_step_data data;
40 int status;
41 size_t result;
42 struct __gconv_step *tomb;
43 const struct gconv_fcts *fcts;
44
45 /* Tell where we want the result. */
46 data.__invocation_counter = 0;
47 data.__internal_use = 1;
48 data.__flags = __GCONV_IS_LAST;
49 data.__statep = ps ?: &state;
50
51 /* Get the conversion functions. */
52 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
53
54 /* Get the structure with the function pointers. */
55 tomb = fcts->tomb;
56 __gconv_fct fct = tomb->__fct;
57 #ifdef PTR_DEMANGLE
58 if (tomb->__shlib_handle != NULL)
59 PTR_DEMANGLE (fct);
60 #endif
61
62 /* We have to handle DST == NULL special. */
63 if (dst == NULL)
64 {
65 mbstate_t temp_state;
66 unsigned char buf[256]; /* Just an arbitrary value. */
67 const wchar_t *srcend = *src + __wcslen (*src) + 1;
68 const unsigned char *inbuf = (const unsigned char *) *src;
69 size_t dummy;
70
71 temp_state = *data.__statep;
72 data.__statep = &temp_state;
73
74 result = 0;
75 data.__outbufend = buf + sizeof (buf);
76
77 do
78 {
79 data.__outbuf = buf;
80
81 status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
82 (const unsigned char *) srcend, NULL,
83 &dummy, 0, 1));
84
85 /* Count the number of bytes. */
86 result += data.__outbuf - buf;
87 }
88 while (status == __GCONV_FULL_OUTPUT);
89
90 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
91 {
92 /* There better should be a NUL byte at the end. */
93 assert (data.__outbuf[-1] == '\0');
94 /* Don't count the NUL character in. */
95 --result;
96 }
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. */
103 const wchar_t *srcend = *src + __wcsnlen (*src, len) + 1;
104 size_t dummy;
105
106 data.__outbuf = (unsigned char *) dst;
107 data.__outbufend = (unsigned char *) dst + len;
108
109 status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
110 (const unsigned char *) srcend, NULL,
111 &dummy, 0, 1));
112
113 /* Count the number of bytes. */
114 result = data.__outbuf - (unsigned char *) dst;
115
116 /* We have to determine whether the last character converted
117 is the NUL character. */
118 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
119 && data.__outbuf[-1] == '\0')
120 {
121 assert (data.__outbuf != (unsigned char *) dst);
122 assert (__mbsinit (data.__statep));
123 *src = NULL;
124 --result;
125 }
126 }
127
128 /* There must not be any problems with the conversion but illegal input
129 characters. */
130 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
131 || status == __GCONV_ILLEGAL_INPUT
132 || status == __GCONV_INCOMPLETE_INPUT
133 || status == __GCONV_FULL_OUTPUT);
134
135 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
136 && status != __GCONV_EMPTY_INPUT)
137 {
138 result = (size_t) -1;
139 __set_errno (EILSEQ);
140 }
141
142 return result;
143 }
144 weak_alias (__wcsrtombs, wcsrtombs)
145