1/* Copyright (C) 2002-2022 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 <ctype.h>
20#include <string.h>
21#include "wcsmbsload.h"
22#include <dlfcn.h>
23#include <errno.h>
24#include <gconv.h>
25#include <stdlib.h>
26#include <string.h>
27#include <wchar.h>
28#include <wcsmbsload.h>
29
30#include <sysdep.h>
31
32#ifndef EILSEQ
33# define EILSEQ EINVAL
34#endif
35
36
37size_t
38attribute_hidden
39__mbsrtowcs_l (wchar_t *dst, const char **src, size_t len, mbstate_t *ps,
40 locale_t l)
41{
42 struct __gconv_step_data data;
43 size_t result;
44 int status;
45 struct __gconv_step *towc;
46 size_t non_reversible;
47 const struct gconv_fcts *fcts;
48
49 /* Tell where we want the result. */
50 data.__invocation_counter = 0;
51 data.__internal_use = 1;
52 data.__flags = __GCONV_IS_LAST;
53 data.__statep = ps;
54
55 /* Get the conversion functions. */
56 fcts = get_gconv_fcts (l->__locales[LC_CTYPE]);
57
58 /* Get the structure with the function pointers. */
59 towc = fcts->towc;
60 __gconv_fct fct = towc->__fct;
61#ifdef PTR_DEMANGLE
62 if (towc->__shlib_handle != NULL)
63 PTR_DEMANGLE (fct);
64#endif
65
66 /* We have to handle DST == NULL special. */
67 if (dst == NULL)
68 {
69 mbstate_t temp_state;
70 wchar_t buf[64]; /* Just an arbitrary size. */
71 const unsigned char *inbuf = (const unsigned char *) *src;
72 const unsigned char *srcend = inbuf + strlen (*src) + 1;
73
74 temp_state = *data.__statep;
75 data.__statep = &temp_state;
76
77 result = 0;
78 data.__outbufend = (unsigned char *) buf + sizeof (buf);
79 do
80 {
81 data.__outbuf = (unsigned char *) buf;
82
83 status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL,
84 &non_reversible, 0, 1));
85
86 result += (wchar_t *) 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 wide char at the end. */
93 assert (((wchar_t *) data.__outbuf)[-1] == L'\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 unsigned char *srcp = (const unsigned char *) *src;
104 const unsigned char *srcend;
105
106 data.__outbuf = (unsigned char *) dst;
107 data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
108
109 status = __GCONV_FULL_OUTPUT;
110
111 while (len > 0)
112 {
113 /* Pessimistic guess as to how much input we can use. In the
114 worst case we need one input byte for one output wchar_t. */
115 srcend = srcp + __strnlen ((const char *) srcp, len) + 1;
116
117 status = DL_CALL_FCT (fct, (towc, &data, &srcp, srcend, NULL,
118 &non_reversible, 0, 1));
119 if ((status != __GCONV_EMPTY_INPUT
120 && status != __GCONV_INCOMPLETE_INPUT)
121 /* Not all input read. */
122 || srcp != srcend
123 /* Reached the end of the input. */
124 || srcend[-1] == '\0')
125 break;
126
127 len = (wchar_t *) data.__outbufend - (wchar_t *) data.__outbuf;
128 }
129
130 /* Make the end if the input known to the caller. */
131 *src = (const char *) srcp;
132
133 result = (wchar_t *) data.__outbuf - dst;
134
135 /* We have to determine whether the last character converted
136 is the NUL character. */
137 if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
138 && ((wchar_t *) dst)[result - 1] == L'\0')
139 {
140 assert (result > 0);
141 assert (__mbsinit (data.__statep));
142 *src = NULL;
143 --result;
144 }
145 }
146
147 /* There must not be any problems with the conversion but illegal input
148 characters. */
149 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
150 || status == __GCONV_ILLEGAL_INPUT
151 || status == __GCONV_INCOMPLETE_INPUT
152 || status == __GCONV_FULL_OUTPUT);
153
154 if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
155 && status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
156 {
157 result = (size_t) -1;
158 __set_errno (EILSEQ);
159 }
160
161 return result;
162}
163