lib/libc/locale/mbrtocXX_iconv.h

   1 /*-
   2  * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: head/lib/libc/locale/mbrtocXX_iconv.h 281550 2015-04-15 09:09:20Z tijl $
  27  */
  28
  29 #include <sys/queue.h>
  30
  31 #include <assert.h>
  32 #include <errno.h>
  33 #include <langinfo.h>
  34 #include <limits.h>
  35 #include <string.h>
  36 #include <uchar.h>
  37
  38 #include "../citrus/citrus_hash.h"
  39 #include "../citrus/citrus_module.h"
  40 #include "../citrus/citrus_iconv.h"
  41 #include "xlocale_private.h"
  42
  43 typedef struct {
  44         bool                    initialized;
  45         struct _citrus_iconv    iconv;
  46         char                    srcbuf[MB_LEN_MAX];
  47         size_t                  srcbuf_len;
  48         union {
  49                 charXX_t        widechar[DSTBUF_LEN];
  50                 char            bytes[sizeof(charXX_t) * DSTBUF_LEN];
  51         } dstbuf;
  52         size_t                  dstbuf_len;
  53 } _ConversionState;
  54 _Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
  55     "Size of _ConversionState must not exceed mbstate_t's size.");
  56
  57 size_t
  58 mbrtocXX_l(charXX_t * __restrict pc, const char * __restrict s, size_t n,
  59     mbstate_t * __restrict ps, locale_t locale)
  60 {
  61         _ConversionState *cs;
  62         struct _citrus_iconv *handle;
  63         size_t i, retval;
  64         charXX_t retchar;
  65
  66         FIX_LOCALE(locale);
  67         if (ps == NULL)
  68                 ps = &locale->mbrtocXX;
  69         cs = (_ConversionState *)ps;
  70         handle = &cs->iconv;
  71
  72         /* Reinitialize mbstate_t. */
  73         if (s == NULL || !cs->initialized) {
  74                 if (_citrus_iconv_open(&handle,
  75                     nl_langinfo_l(CODESET, locale), UTF_XX_INTERNAL) != 0) {
  76                         cs->initialized = false;
  77                         errno = EINVAL;
  78                         return (-1);
  79                 }
  80                 handle->cv_shared->ci_discard_ilseq = true;
  81                 handle->cv_shared->ci_hooks = NULL;
  82                 cs->srcbuf_len = cs->dstbuf_len = 0;
  83                 cs->initialized = true;
  84                 if (s == NULL)
  85                         return (0);
  86         }
  87
  88         /* See if we still have characters left from the previous invocation. */
  89         if (cs->dstbuf_len > 0) {
  90                 retval = (size_t)-3;
  91                 goto return_char;
  92         }
  93
  94         /* Fill up the read buffer as far as possible. */
  95         if (n > sizeof(cs->srcbuf) - cs->srcbuf_len)
  96                 n = sizeof(cs->srcbuf) - cs->srcbuf_len;
  97         memcpy(cs->srcbuf + cs->srcbuf_len, s, n);
  98
  99         /* Convert as few characters to the dst buffer as possible. */
 100         for (i = 0; ; i++) {
 101                 char *src, *dst;
 102                 size_t srcleft, dstleft, invlen;
 103                 int err;
 104
 105                 src = cs->srcbuf;
 106                 srcleft = cs->srcbuf_len + n;
 107                 dst = cs->dstbuf.bytes;
 108                 dstleft = i * sizeof(charXX_t);
 109                 assert(srcleft <= sizeof(cs->srcbuf) &&
 110                     dstleft <= sizeof(cs->dstbuf.bytes));
 111                 err = _citrus_iconv_convert(handle, &src, &srcleft,
 112                     &dst, &dstleft, 0, &invlen);
 113                 cs->dstbuf_len = (dst - cs->dstbuf.bytes) / sizeof(charXX_t);
 114
 115                 /* Got new character(s). Return the first. */
 116                 if (cs->dstbuf_len > 0) {
 117                         assert(src - cs->srcbuf > cs->srcbuf_len);
 118                         retval = src - cs->srcbuf - cs->srcbuf_len;
 119                         cs->srcbuf_len = 0;
 120                         goto return_char;
 121                 }
 122
 123                 /* Increase dst buffer size, to obtain the surrogate pair. */
 124                 if (err == E2BIG)
 125                         continue;
 126
 127                 /* Illegal sequence. */
 128                 if (invlen > 0) {
 129                         cs->srcbuf_len = 0;
 130                         errno = EILSEQ;
 131                         return ((size_t)-1);
 132                 }
 133
 134                 /* Save unprocessed remainder for the next invocation. */
 135                 memmove(cs->srcbuf, src, srcleft);
 136                 cs->srcbuf_len = srcleft;
 137                 return ((size_t)-2);
 138         }
 139
 140 return_char:
 141         retchar = cs->dstbuf.widechar[0];
 142         memmove(&cs->dstbuf.widechar[0], &cs->dstbuf.widechar[1],
 143             --cs->dstbuf_len * sizeof(charXX_t));
 144         if (pc != NULL)
 145                 *pc = retchar;
 146         if (retchar == 0)
 147                 return (0);
 148         return (retval);
 149 }
 150
 151 size_t
 152 mbrtocXX(charXX_t * __restrict pc, const char * __restrict s, size_t n,
 153     mbstate_t * __restrict ps)
 154 {
 155
 156         return (mbrtocXX_l(pc, s, n, ps, __get_locale()));
 157 }