1/* Copyright (C) 1996-2021 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 <https://www.gnu.org/licenses/>. */
18
19#include <assert.h>
20#include <dlfcn.h>
21#include <errno.h>
22#include <stdlib.h>
23#include <gconv.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. */
35static mbstate_t state;
36
37size_t
38__wcsrtombs (char *dst, const wchar_t **src, size_t len, mbstate_t *ps)
39{
40 struct __gconv_step_data data;
41 int status;
42 size_t result;
43 struct __gconv_step *tomb;
44 const struct gconv_fcts *fcts;
45
46 /* Tell where we want the result. */
47 data.__invocation_counter = 0;
48 data.__internal_use = 1;
49 data.__flags = __GCONV_IS_LAST;
50 data.__statep = ps ?: &state;
51
52 /* Get the conversion functions. */
53 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
54
55 /* Get the structure with the function pointers. */
56 tomb = fcts->tomb;
57 __gconv_fct fct = tomb->__fct;
58#ifdef PTR_DEMANGLE
59 if (tomb->__shlib_handle != NULL)
60 PTR_DEMANGLE (fct);
61#endif
62
63 /* We have to handle DST == NULL special. */
64 if (dst == NULL)
65 {
66 mbstate_t temp_state;
67 unsigned char buf[256]; /* Just an arbitrary value. */
68 const wchar_t *srcend = *src + __wcslen (*src) + 1;
69 const unsigned char *inbuf = (const unsigned char *) *src;
70 size_t dummy;
71
72 temp_state = *data.__statep;
73 data.__statep = &temp_state;
74
75 result = 0;
76 data.__outbufend = buf + sizeof (buf);
77
78 do
79 {
80 data.__outbuf = buf;
81
82 status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
83 (const unsigned char *) srcend, NULL,
84 &dummy, 0, 1));
85
86 /* Count the number of bytes. */
87 result += data.__outbuf - buf;
88 }
89 while (status == __GCONV_FULL_OUTPUT);
90
91 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
92 {
93 /* There better should be a NUL byte at the end. */
94 assert (data.__outbuf[-1] == '\0');
95 /* Don't count the NUL character in. */
96 --result;
97 }
98 }
99 else
100 {
101 /* This code is based on the safe assumption that all internal
102 multi-byte encodings use the NUL byte only to mark the end
103 of the string. */
104 const wchar_t *srcend = *src + __wcsnlen (*src, len) + 1;
105 size_t dummy;
106
107 data.__outbuf = (unsigned char *) dst;
108 data.__outbufend = (unsigned char *) dst + len;
109
110 status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
111 (const unsigned char *) srcend, NULL,
112 &dummy, 0, 1));
113
114 /* Count the number of bytes. */
115 result = data.__outbuf - (unsigned char *) dst;
116
117 /* We have to determine whether the last character converted
118 is the NUL character. */
119 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
120 && data.__outbuf[-1] == '\0')
121 {
122 assert (data.__outbuf != (unsigned char *) dst);
123 assert (__mbsinit (data.__statep));
124 *src = NULL;
125 --result;
126 }
127 }
128
129 /* There must not be any problems with the conversion but illegal input
130 characters. */
131 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
132 || status == __GCONV_ILLEGAL_INPUT
133 || status == __GCONV_INCOMPLETE_INPUT
134 || status == __GCONV_FULL_OUTPUT);
135
136 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
137 && status != __GCONV_EMPTY_INPUT)
138 {
139 result = (size_t) -1;
140 __set_errno (EILSEQ);
141 }
142
143 return result;
144}
145weak_alias (__wcsrtombs, wcsrtombs)
146