1/* Copyright (C) 1996-2023 Free Software Foundation, Inc.
2 Copyright The GNU Toolchain Authors.
3 This file is part of the GNU C Library.
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 <gconv.h>
23#include <stdlib.h>
24#include <string.h>
25#include <wchar.h>
26#include <wcsmbsload.h>
27
28#include <pointer_guard.h>
29
30#ifndef EILSEQ
31# define EILSEQ EINVAL
32#endif
33
34
35/* This is the private state used if PS is NULL. */
36static mbstate_t state;
37
38size_t
39__wcrtomb_internal (char *s, wchar_t wc, mbstate_t *ps, size_t s_size)
40{
41 char buf[MB_LEN_MAX];
42 struct __gconv_step_data data;
43 int status;
44 size_t result;
45 size_t dummy;
46 const struct gconv_fcts *fcts;
47
48 /* Set information for this step. */
49 data.__invocation_counter = 0;
50 data.__internal_use = 1;
51 data.__flags = __GCONV_IS_LAST;
52 data.__statep = ps ?: &state;
53
54 /* A first special case is if S is NULL. This means put PS in the
55 initial state. */
56 if (s == NULL)
57 wc = L'\0';
58
59 /* Tell where we want to have the result. */
60 data.__outbuf = (unsigned char *) buf;
61 data.__outbufend = (unsigned char *) buf + sizeof buf;
62
63 /* Get the conversion functions. */
64 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
65 __gconv_fct fct = fcts->tomb->__fct;
66 if (fcts->tomb->__shlib_handle != NULL)
67 PTR_DEMANGLE (fct);
68
69 /* If WC is the NUL character we write into the output buffer the byte
70 sequence necessary for PS to get into the initial state, followed
71 by a NUL byte. */
72 if (wc == L'\0')
73 {
74 status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
75 NULL, &dummy, 1, 1));
76
77 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
78 *data.__outbuf++ = '\0';
79 }
80 else
81 {
82 /* Do a normal conversion. */
83 const unsigned char *inbuf = (const unsigned char *) &wc;
84
85 status = DL_CALL_FCT (fct,
86 (fcts->tomb, &data, &inbuf,
87 inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
88 }
89
90 /* There must not be any problems with the conversion but illegal input
91 characters. The output buffer must be large enough, otherwise the
92 definition of MB_CUR_MAX is not correct. All the other possible
93 errors also must not happen. */
94 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
95 || status == __GCONV_ILLEGAL_INPUT
96 || status == __GCONV_INCOMPLETE_INPUT
97 || status == __GCONV_FULL_OUTPUT);
98
99 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
100 || status == __GCONV_FULL_OUTPUT)
101 {
102 result = data.__outbuf - (unsigned char *) buf;
103
104 if (s != NULL)
105 {
106 if (result > s_size)
107 __chk_fail ();
108
109 memcpy (s, buf, result);
110 }
111 }
112 else
113 {
114 result = (size_t) -1;
115 __set_errno (EILSEQ);
116 }
117
118 return result;
119}
120
121size_t
122__wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
123{
124 return __wcrtomb_internal (s, wc, ps, (size_t) -1);
125}
126weak_alias (__wcrtomb, wcrtomb)
127libc_hidden_weak (wcrtomb)
128