1/* Copyright (C) 1996-2023 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 <pointer_guard.h>
27
28#ifndef EILSEQ
29# define EILSEQ EINVAL
30#endif
31
32
33/* This is the private state used if PS is NULL. */
34static mbstate_t state;
35
36size_t
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 if (tomb->__shlib_handle != NULL)
58 PTR_DEMANGLE (fct);
59
60 /* We have to handle DST == NULL special. */
61 if (dst == NULL)
62 {
63 mbstate_t temp_state;
64 unsigned char buf[256]; /* Just an arbitrary value. */
65 const wchar_t *srcend = *src + __wcslen (*src) + 1;
66 const unsigned char *inbuf = (const unsigned char *) *src;
67 size_t dummy;
68
69 temp_state = *data.__statep;
70 data.__statep = &temp_state;
71
72 result = 0;
73 data.__outbufend = buf + sizeof (buf);
74
75 do
76 {
77 data.__outbuf = buf;
78
79 status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
80 (const unsigned char *) srcend, NULL,
81 &dummy, 0, 1));
82
83 /* Count the number of bytes. */
84 result += data.__outbuf - buf;
85 }
86 while (status == __GCONV_FULL_OUTPUT);
87
88 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
89 {
90 /* There better should be a NUL byte at the end. */
91 assert (data.__outbuf[-1] == '\0');
92 /* Don't count the NUL character in. */
93 --result;
94 }
95 }
96 else
97 {
98 /* This code is based on the safe assumption that all internal
99 multi-byte encodings use the NUL byte only to mark the end
100 of the string. */
101 const wchar_t *srcend = *src + __wcsnlen (*src, len) + 1;
102 size_t dummy;
103
104 data.__outbuf = (unsigned char *) dst;
105 data.__outbufend = (unsigned char *) dst + len;
106
107 status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
108 (const unsigned char *) srcend, NULL,
109 &dummy, 0, 1));
110
111 /* Count the number of bytes. */
112 result = data.__outbuf - (unsigned char *) dst;
113
114 /* We have to determine whether the last character converted
115 is the NUL character. */
116 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
117 && data.__outbuf[-1] == '\0')
118 {
119 assert (data.__outbuf != (unsigned char *) dst);
120 assert (__mbsinit (data.__statep));
121 *src = NULL;
122 --result;
123 }
124 }
125
126 /* There must not be any problems with the conversion but illegal input
127 characters. */
128 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
129 || status == __GCONV_ILLEGAL_INPUT
130 || status == __GCONV_INCOMPLETE_INPUT
131 || status == __GCONV_FULL_OUTPUT);
132
133 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
134 && status != __GCONV_EMPTY_INPUT)
135 {
136 result = (size_t) -1;
137 __set_errno (EILSEQ);
138 }
139
140 return result;
141}
142weak_alias (__wcsrtombs, wcsrtombs)
143