| 1 | /* Convert multibyte character to wide character.
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| 2 | Copyright (C) 1999-2002, 2005-2012 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2008.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #include <config.h>
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| 19 |
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| 20 | /* Specification. */
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| 21 | #include <wchar.h>
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| 22 |
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| 23 | #if GNULIB_defined_mbstate_t
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| 24 | /* Implement mbrtowc() on top of mbtowc(). */
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| 25 |
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| 26 | # include <errno.h>
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| 27 | # include <stdlib.h>
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| 28 |
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| 29 | # include "localcharset.h"
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| 30 | # include "streq.h"
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| 31 | # include "verify.h"
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| 32 |
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| 33 |
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| 34 | verify (sizeof (mbstate_t) >= 4);
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| 35 |
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| 36 | static char internal_state[4];
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| 37 |
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| 38 | size_t
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| 39 | mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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| 40 | {
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| 41 | char *pstate = (char *)ps;
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| 42 |
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| 43 | if (s == NULL)
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| 44 | {
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| 45 | pwc = NULL;
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| 46 | s = "";
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| 47 | n = 1;
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| 48 | }
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| 49 |
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| 50 | if (n == 0)
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| 51 | return (size_t)(-2);
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| 52 |
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| 53 | /* Here n > 0. */
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| 54 |
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| 55 | if (pstate == NULL)
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| 56 | pstate = internal_state;
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| 57 |
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| 58 | {
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| 59 | size_t nstate = pstate[0];
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| 60 | char buf[4];
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| 61 | const char *p;
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| 62 | size_t m;
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| 63 |
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| 64 | switch (nstate)
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| 65 | {
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| 66 | case 0:
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| 67 | p = s;
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| 68 | m = n;
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| 69 | break;
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| 70 | case 3:
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| 71 | buf[2] = pstate[3];
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| 72 | /*FALLTHROUGH*/
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| 73 | case 2:
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| 74 | buf[1] = pstate[2];
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| 75 | /*FALLTHROUGH*/
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| 76 | case 1:
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| 77 | buf[0] = pstate[1];
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| 78 | p = buf;
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| 79 | m = nstate;
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| 80 | buf[m++] = s[0];
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| 81 | if (n >= 2 && m < 4)
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| 82 | {
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| 83 | buf[m++] = s[1];
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| 84 | if (n >= 3 && m < 4)
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| 85 | buf[m++] = s[2];
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| 86 | }
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| 87 | break;
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| 88 | default:
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| 89 | errno = EINVAL;
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| 90 | return (size_t)(-1);
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| 91 | }
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| 92 |
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| 93 | /* Here m > 0. */
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| 94 |
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| 95 | # if __GLIBC__ || defined __UCLIBC__
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| 96 | /* Work around bug <http://sourceware.org/bugzilla/show_bug.cgi?id=9674> */
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| 97 | mbtowc (NULL, NULL, 0);
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| 98 | # endif
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| 99 | {
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| 100 | int res = mbtowc (pwc, p, m);
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| 101 |
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| 102 | if (res >= 0)
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| 103 | {
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| 104 | if (pwc != NULL && ((*pwc == 0) != (res == 0)))
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| 105 | abort ();
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| 106 | if (nstate >= (res > 0 ? res : 1))
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| 107 | abort ();
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| 108 | res -= nstate;
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| 109 | pstate[0] = 0;
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| 110 | return res;
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| 111 | }
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| 112 |
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| 113 | /* mbtowc does not distinguish between invalid and incomplete multibyte
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| 114 | sequences. But mbrtowc needs to make this distinction.
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| 115 | There are two possible approaches:
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| 116 | - Use iconv() and its return value.
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| 117 | - Use built-in knowledge about the possible encodings.
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| 118 | Given the low quality of implementation of iconv() on the systems that
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| 119 | lack mbrtowc(), we use the second approach.
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| 120 | The possible encodings are:
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| 121 | - 8-bit encodings,
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| 122 | - EUC-JP, EUC-KR, GB2312, EUC-TW, BIG5, GB18030, SJIS,
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| 123 | - UTF-8.
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| 124 | Use specialized code for each. */
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| 125 | if (m >= 4 || m >= MB_CUR_MAX)
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| 126 | goto invalid;
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| 127 | /* Here MB_CUR_MAX > 1 and 0 < m < 4. */
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| 128 | {
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| 129 | const char *encoding = locale_charset ();
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| 130 |
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| 131 | if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
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| 132 | {
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| 133 | /* Cf. unistr/u8-mblen.c. */
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| 134 | unsigned char c = (unsigned char) p[0];
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| 135 |
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| 136 | if (c >= 0xc2)
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| 137 | {
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| 138 | if (c < 0xe0)
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| 139 | {
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| 140 | if (m == 1)
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| 141 | goto incomplete;
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| 142 | }
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| 143 | else if (c < 0xf0)
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| 144 | {
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| 145 | if (m == 1)
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| 146 | goto incomplete;
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| 147 | if (m == 2)
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| 148 | {
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| 149 | unsigned char c2 = (unsigned char) p[1];
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| 150 |
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| 151 | if ((c2 ^ 0x80) < 0x40
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| 152 | && (c >= 0xe1 || c2 >= 0xa0)
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| 153 | && (c != 0xed || c2 < 0xa0))
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| 154 | goto incomplete;
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| 155 | }
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| 156 | }
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| 157 | else if (c <= 0xf4)
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| 158 | {
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| 159 | if (m == 1)
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| 160 | goto incomplete;
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| 161 | else /* m == 2 || m == 3 */
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| 162 | {
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| 163 | unsigned char c2 = (unsigned char) p[1];
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| 164 |
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| 165 | if ((c2 ^ 0x80) < 0x40
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| 166 | && (c >= 0xf1 || c2 >= 0x90)
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| 167 | && (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
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| 168 | {
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| 169 | if (m == 2)
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| 170 | goto incomplete;
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| 171 | else /* m == 3 */
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| 172 | {
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| 173 | unsigned char c3 = (unsigned char) p[2];
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| 174 |
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| 175 | if ((c3 ^ 0x80) < 0x40)
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| 176 | goto incomplete;
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| 177 | }
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| 178 | }
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| 179 | }
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| 180 | }
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| 181 | }
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| 182 | goto invalid;
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| 183 | }
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| 184 |
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| 185 | /* As a reference for this code, you can use the GNU libiconv
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| 186 | implementation. Look for uses of the RET_TOOFEW macro. */
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| 187 |
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| 188 | if (STREQ_OPT (encoding,
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| 189 | "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
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| 190 | {
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| 191 | if (m == 1)
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| 192 | {
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| 193 | unsigned char c = (unsigned char) p[0];
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| 194 |
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| 195 | if ((c >= 0xa1 && c < 0xff) || c == 0x8e || c == 0x8f)
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| 196 | goto incomplete;
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| 197 | }
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| 198 | if (m == 2)
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| 199 | {
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| 200 | unsigned char c = (unsigned char) p[0];
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| 201 |
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| 202 | if (c == 0x8f)
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| 203 | {
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| 204 | unsigned char c2 = (unsigned char) p[1];
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| 205 |
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| 206 | if (c2 >= 0xa1 && c2 < 0xff)
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| 207 | goto incomplete;
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| 208 | }
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| 209 | }
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| 210 | goto invalid;
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| 211 | }
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| 212 | if (STREQ_OPT (encoding,
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| 213 | "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
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| 214 | || STREQ_OPT (encoding,
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| 215 | "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
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| 216 | || STREQ_OPT (encoding,
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| 217 | "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
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| 218 | {
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| 219 | if (m == 1)
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| 220 | {
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| 221 | unsigned char c = (unsigned char) p[0];
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| 222 |
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| 223 | if (c >= 0xa1 && c < 0xff)
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| 224 | goto incomplete;
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| 225 | }
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| 226 | goto invalid;
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| 227 | }
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| 228 | if (STREQ_OPT (encoding,
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| 229 | "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
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| 230 | {
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| 231 | if (m == 1)
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| 232 | {
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| 233 | unsigned char c = (unsigned char) p[0];
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| 234 |
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| 235 | if ((c >= 0xa1 && c < 0xff) || c == 0x8e)
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| 236 | goto incomplete;
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| 237 | }
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| 238 | else /* m == 2 || m == 3 */
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| 239 | {
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| 240 | unsigned char c = (unsigned char) p[0];
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| 241 |
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| 242 | if (c == 0x8e)
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| 243 | goto incomplete;
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| 244 | }
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| 245 | goto invalid;
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| 246 | }
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| 247 | if (STREQ_OPT (encoding,
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| 248 | "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
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| 249 | {
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| 250 | if (m == 1)
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| 251 | {
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| 252 | unsigned char c = (unsigned char) p[0];
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| 253 |
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| 254 | if ((c >= 0x90 && c <= 0xe3) || (c >= 0xf8 && c <= 0xfe))
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| 255 | goto incomplete;
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| 256 | }
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| 257 | else /* m == 2 || m == 3 */
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| 258 | {
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| 259 | unsigned char c = (unsigned char) p[0];
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| 260 |
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| 261 | if (c >= 0x90 && c <= 0xe3)
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| 262 | {
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| 263 | unsigned char c2 = (unsigned char) p[1];
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| 264 |
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| 265 | if (c2 >= 0x30 && c2 <= 0x39)
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| 266 | {
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| 267 | if (m == 2)
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| 268 | goto incomplete;
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| 269 | else /* m == 3 */
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| 270 | {
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| 271 | unsigned char c3 = (unsigned char) p[2];
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| 272 |
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| 273 | if (c3 >= 0x81 && c3 <= 0xfe)
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| 274 | goto incomplete;
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| 275 | }
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| 276 | }
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| 277 | }
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| 278 | }
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| 279 | goto invalid;
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| 280 | }
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| 281 | if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
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| 282 | {
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| 283 | if (m == 1)
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| 284 | {
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| 285 | unsigned char c = (unsigned char) p[0];
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| 286 |
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| 287 | if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)
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| 288 | || (c >= 0xf0 && c <= 0xf9))
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| 289 | goto incomplete;
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| 290 | }
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| 291 | goto invalid;
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| 292 | }
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| 293 |
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| 294 | /* An unknown multibyte encoding. */
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| 295 | goto incomplete;
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| 296 | }
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| 297 |
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| 298 | incomplete:
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| 299 | {
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| 300 | size_t k = nstate;
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| 301 | /* Here 0 <= k < m < 4. */
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| 302 | pstate[++k] = s[0];
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| 303 | if (k < m)
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| 304 | {
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| 305 | pstate[++k] = s[1];
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| 306 | if (k < m)
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| 307 | pstate[++k] = s[2];
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| 308 | }
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| 309 | if (k != m)
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| 310 | abort ();
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| 311 | }
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| 312 | pstate[0] = m;
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| 313 | return (size_t)(-2);
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| 314 |
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| 315 | invalid:
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| 316 | errno = EILSEQ;
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| 317 | /* The conversion state is undefined, says POSIX. */
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| 318 | return (size_t)(-1);
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| 319 | }
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| 320 | }
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| 321 | }
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| 322 |
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| 323 | #else
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| 324 | /* Override the system's mbrtowc() function. */
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| 325 |
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| 326 | # undef mbrtowc
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| 327 |
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| 328 | size_t
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| 329 | rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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| 330 | {
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| 331 | # if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG
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| 332 | if (s == NULL)
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| 333 | {
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| 334 | pwc = NULL;
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| 335 | s = "";
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| 336 | n = 1;
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| 337 | }
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| 338 | # endif
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| 339 |
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| 340 | # if MBRTOWC_RETVAL_BUG
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| 341 | {
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| 342 | static mbstate_t internal_state;
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| 343 |
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| 344 | /* Override mbrtowc's internal state. We cannot call mbsinit() on the
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| 345 | hidden internal state, but we can call it on our variable. */
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| 346 | if (ps == NULL)
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| 347 | ps = &internal_state;
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| 348 |
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| 349 | if (!mbsinit (ps))
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| 350 | {
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| 351 | /* Parse the rest of the multibyte character byte for byte. */
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| 352 | size_t count = 0;
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| 353 | for (; n > 0; s++, n--)
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| 354 | {
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| 355 | wchar_t wc;
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| 356 | size_t ret = mbrtowc (&wc, s, 1, ps);
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| 357 |
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| 358 | if (ret == (size_t)(-1))
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| 359 | return (size_t)(-1);
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| 360 | count++;
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| 361 | if (ret != (size_t)(-2))
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| 362 | {
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| 363 | /* The multibyte character has been completed. */
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| 364 | if (pwc != NULL)
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| 365 | *pwc = wc;
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| 366 | return (wc == 0 ? 0 : count);
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| 367 | }
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| 368 | }
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| 369 | return (size_t)(-2);
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| 370 | }
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| 371 | }
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| 372 | # endif
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| 373 |
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| 374 | # if MBRTOWC_NUL_RETVAL_BUG
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| 375 | {
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| 376 | wchar_t wc;
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| 377 | size_t ret = mbrtowc (&wc, s, n, ps);
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| 378 |
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| 379 | if (ret != (size_t)(-1) && ret != (size_t)(-2))
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| 380 | {
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| 381 | if (pwc != NULL)
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| 382 | *pwc = wc;
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| 383 | if (wc == 0)
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| 384 | ret = 0;
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| 385 | }
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| 386 | return ret;
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| 387 | }
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| 388 | # else
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| 389 | {
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| 390 | # if MBRTOWC_NULL_ARG1_BUG
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| 391 | wchar_t dummy;
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| 392 |
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| 393 | if (pwc == NULL)
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| 394 | pwc = &dummy;
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| 395 | # endif
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| 396 |
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| 397 | return mbrtowc (pwc, s, n, ps);
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| 398 | }
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| 399 | # endif
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| 400 | }
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| 401 |
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| 402 | #endif
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