1 /* Copyright (C) 1996-2021 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 <gconv.h>
22 #include <stdlib.h>
23 #include <wchar.h>
24 #include <wcsmbsload.h>
25
26 #include <sysdep.h>
27
28 #ifndef EILSEQ
29 # define EILSEQ EINVAL
30 #endif
31
32
33 /* This is the private state used if PS is NULL. */
34 static mbstate_t state;
35
36 size_t
__wcrtomb(char * s,wchar_t wc,mbstate_t * ps)37 __wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
38 {
39 char buf[MB_LEN_MAX];
40 struct __gconv_step_data data;
41 int status;
42 size_t result;
43 size_t dummy;
44 const struct gconv_fcts *fcts;
45
46 /* Set information for this step. */
47 data.__invocation_counter = 0;
48 data.__internal_use = 1;
49 data.__flags = __GCONV_IS_LAST;
50 data.__statep = ps ?: &state;
51
52 /* A first special case is if S is NULL. This means put PS in the
53 initial state. */
54 if (s == NULL)
55 {
56 s = buf;
57 wc = L'\0';
58 }
59
60 /* Tell where we want to have the result. */
61 data.__outbuf = (unsigned char *) s;
62 data.__outbufend = (unsigned char *) s + MB_CUR_MAX;
63
64 /* Get the conversion functions. */
65 fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
66 __gconv_fct fct = fcts->tomb->__fct;
67 #ifdef PTR_DEMANGLE
68 if (fcts->tomb->__shlib_handle != NULL)
69 PTR_DEMANGLE (fct);
70 #endif
71
72 /* If WC is the NUL character we write into the output buffer the byte
73 sequence necessary for PS to get into the initial state, followed
74 by a NUL byte. */
75 if (wc == L'\0')
76 {
77 status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
78 NULL, &dummy, 1, 1));
79
80 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
81 *data.__outbuf++ = '\0';
82 }
83 else
84 {
85 /* Do a normal conversion. */
86 const unsigned char *inbuf = (const unsigned char *) &wc;
87
88 status = DL_CALL_FCT (fct,
89 (fcts->tomb, &data, &inbuf,
90 inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
91 }
92
93 /* There must not be any problems with the conversion but illegal input
94 characters. The output buffer must be large enough, otherwise the
95 definition of MB_CUR_MAX is not correct. All the other possible
96 errors also must not happen. */
97 assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
98 || status == __GCONV_ILLEGAL_INPUT
99 || status == __GCONV_INCOMPLETE_INPUT
100 || status == __GCONV_FULL_OUTPUT);
101
102 if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
103 || status == __GCONV_FULL_OUTPUT)
104 result = data.__outbuf - (unsigned char *) s;
105 else
106 {
107 result = (size_t) -1;
108 __set_errno (EILSEQ);
109 }
110
111 return result;
112 }
113 weak_alias (__wcrtomb, wcrtomb)
114 libc_hidden_weak (wcrtomb)
115