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@cygnus.com>, 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 <gconv.h>
23#include <stdlib.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__wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
39{
40 char buf[MB_LEN_MAX];
41 struct __gconv_step_data data;
42 int status;
43 size_t result;
44 size_t dummy;
45 const struct gconv_fcts *fcts;
46
47 /* Set information for this step. */
48 data.__invocation_counter = 0;
49 data.__internal_use = 1;
50 data.__flags = __GCONV_IS_LAST;
51 data.__statep = ps ?: &state;
52
53 /* A first special case is if S is NULL. This means put PS in the
54 initial state. */
55 if (s == NULL)
56 {
57 s = buf;
58 wc = L'\0';
59 }
60
61 /* Tell where we want to have the result. */
62 data.__outbuf = (unsigned char *) s;
63 data.__outbufend = (unsigned char *) s + MB_CUR_MAX;
64
65 /* Get the conversion functions. */
66 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
67 __gconv_fct fct = fcts->tomb->__fct;
68#ifdef PTR_DEMANGLE
69 if (fcts->tomb->__shlib_handle != NULL)
70 PTR_DEMANGLE (fct);
71#endif
72
73 /* If WC is the NUL character we write into the output buffer the byte
74 sequence necessary for PS to get into the initial state, followed
75 by a NUL byte. */
76 if (wc == L'\0')
77 {
78 status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
79 NULL, &dummy, 1, 1));
80
81 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
82 *data.__outbuf++ = '\0';
83 }
84 else
85 {
86 /* Do a normal conversion. */
87 const unsigned char *inbuf = (const unsigned char *) &wc;
88
89 status = DL_CALL_FCT (fct,
90 (fcts->tomb, &data, &inbuf,
91 inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
92 }
93
94 /* There must not be any problems with the conversion but illegal input
95 characters. The output buffer must be large enough, otherwise the
96 definition of MB_CUR_MAX is not correct. All the other possible
97 errors also must not happen. */
98 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
99 || status == __GCONV_ILLEGAL_INPUT
100 || status == __GCONV_INCOMPLETE_INPUT
101 || status == __GCONV_FULL_OUTPUT);
102
103 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
104 || status == __GCONV_FULL_OUTPUT)
105 result = data.__outbuf - (unsigned char *) s;
106 else
107 {
108 result = (size_t) -1;
109 __set_errno (EILSEQ);
110 }
111
112 return result;
113}
114weak_alias (__wcrtomb, wcrtomb)
115libc_hidden_weak (wcrtomb)
116