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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/queue.h>
33
34 #include <assert.h>
35 #include <errno.h>
36 #include <langinfo.h>
37 #include <limits.h>
38 #include <string.h>
39 #include <uchar.h>
40
41 #include "../iconv/citrus_hash.h"
42 #include "../iconv/citrus_module.h"
43 #include "../iconv/citrus_iconv.h"
44 #include "mblocal.h"
45
46 typedef struct {
47         bool                    initialized;
48         struct _citrus_iconv    iconv;
49         char                    srcbuf[MB_LEN_MAX];
50         size_t                  srcbuf_len;
51         union {
52                 charXX_t        widechar[DSTBUF_LEN];
53                 char            bytes[sizeof(charXX_t) * DSTBUF_LEN];
54         } dstbuf;
55         size_t                  dstbuf_len;
56 } _ConversionState;
57 _Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
58     "Size of _ConversionState must not exceed mbstate_t's size.");
59
60 size_t
61 mbrtocXX_l(charXX_t * __restrict pc, const char * __restrict s, size_t n,
62     mbstate_t * __restrict ps, locale_t locale)
63 {
64         _ConversionState *cs;
65         struct _citrus_iconv *handle;
66         size_t i, retval;
67         charXX_t retchar;
68
69         FIX_LOCALE(locale);
70         if (ps == NULL)
71                 ps = &(XLOCALE_CTYPE(locale)->mbrtocXX);
72         cs = (_ConversionState *)ps;
73         handle = &cs->iconv;
74
75         /* Reinitialize mbstate_t. */
76         if (s == NULL || !cs->initialized) {
77                 if (_citrus_iconv_open(&handle,
78                     nl_langinfo_l(CODESET, locale), UTF_XX_INTERNAL) != 0) {
79                         cs->initialized = false;
80                         errno = EINVAL;
81                         return (-1);
82                 }
83                 handle->cv_shared->ci_discard_ilseq = true;
84                 handle->cv_shared->ci_hooks = NULL;
85                 cs->srcbuf_len = cs->dstbuf_len = 0;
86                 cs->initialized = true;
87                 if (s == NULL)
88                         return (0);
89         }
90
91         /* See if we still have characters left from the previous invocation. */
92         if (cs->dstbuf_len > 0) {
93                 retval = (size_t)-3;
94                 goto return_char;
95         }
96
97         /* Fill up the read buffer as far as possible. */
98         if (n > sizeof(cs->srcbuf) - cs->srcbuf_len)
99                 n = sizeof(cs->srcbuf) - cs->srcbuf_len;
100         memcpy(cs->srcbuf + cs->srcbuf_len, s, n);
101
102         /* Convert as few characters to the dst buffer as possible. */
103         for (i = 0; ; i++) {
104                 char *src, *dst;
105                 size_t srcleft, dstleft, invlen;
106                 int err;
107
108                 src = cs->srcbuf;
109                 srcleft = cs->srcbuf_len + n;
110                 dst = cs->dstbuf.bytes;
111                 dstleft = i * sizeof(charXX_t);
112                 assert(srcleft <= sizeof(cs->srcbuf) &&
113                     dstleft <= sizeof(cs->dstbuf.bytes));
114                 err = _citrus_iconv_convert(handle, &src, &srcleft,
115                     &dst, &dstleft, 0, &invlen);
116                 cs->dstbuf_len = (dst - cs->dstbuf.bytes) / sizeof(charXX_t);
117
118                 /* Got new character(s). Return the first. */
119                 if (cs->dstbuf_len > 0) {
120                         assert(src - cs->srcbuf > cs->srcbuf_len);
121                         retval = src - cs->srcbuf - cs->srcbuf_len;
122                         cs->srcbuf_len = 0;
123                         goto return_char;
124                 }
125
126                 /* Increase dst buffer size, to obtain the surrogate pair. */
127                 if (err == E2BIG)
128                         continue;
129
130                 /* Illegal sequence. */
131                 if (invlen > 0) {
132                         cs->srcbuf_len = 0;
133                         errno = EILSEQ;
134                         return ((size_t)-1);
135                 }
136
137                 /* Save unprocessed remainder for the next invocation. */
138                 memmove(cs->srcbuf, src, srcleft);
139                 cs->srcbuf_len = srcleft;
140                 return ((size_t)-2);
141         }
142
143 return_char:
144         retchar = cs->dstbuf.widechar[0];
145         memmove(&cs->dstbuf.widechar[0], &cs->dstbuf.widechar[1],
146             --cs->dstbuf_len * sizeof(charXX_t));
147         if (pc != NULL)
148                 *pc = retchar;
149         if (retchar == 0)
150                 return (0);
151         return (retval);
152 }
153
154 size_t
155 mbrtocXX(charXX_t * __restrict pc, const char * __restrict s, size_t n,
156     mbstate_t * __restrict ps)
157 {
158
159         return (mbrtocXX_l(pc, s, n, ps, __get_locale()));
160 }