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403 lines
11 KiB
C
403 lines
11 KiB
C
/* Convert multibyte character to wide character.
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Copyright (C) 1999-2002, 2005-2013 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2008.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <wchar.h>
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#if GNULIB_defined_mbstate_t
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/* Implement mbrtowc() on top of mbtowc(). */
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# include <errno.h>
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# include <stdlib.h>
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# include "localcharset.h"
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# include "streq.h"
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# include "verify.h"
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verify (sizeof (mbstate_t) >= 4);
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static char internal_state[4];
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size_t
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mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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{
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char *pstate = (char *)ps;
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if (s == NULL)
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{
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pwc = NULL;
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s = "";
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n = 1;
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}
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if (n == 0)
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return (size_t)(-2);
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/* Here n > 0. */
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if (pstate == NULL)
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pstate = internal_state;
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{
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size_t nstate = pstate[0];
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char buf[4];
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const char *p;
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size_t m;
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switch (nstate)
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{
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case 0:
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p = s;
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m = n;
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break;
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case 3:
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buf[2] = pstate[3];
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/*FALLTHROUGH*/
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case 2:
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buf[1] = pstate[2];
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/*FALLTHROUGH*/
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case 1:
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buf[0] = pstate[1];
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p = buf;
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m = nstate;
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buf[m++] = s[0];
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if (n >= 2 && m < 4)
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{
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buf[m++] = s[1];
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if (n >= 3 && m < 4)
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buf[m++] = s[2];
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}
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break;
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default:
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errno = EINVAL;
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return (size_t)(-1);
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}
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/* Here m > 0. */
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# if __GLIBC__ || defined __UCLIBC__
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/* Work around bug <http://sourceware.org/bugzilla/show_bug.cgi?id=9674> */
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mbtowc (NULL, NULL, 0);
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# endif
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{
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int res = mbtowc (pwc, p, m);
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if (res >= 0)
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{
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if (pwc != NULL && ((*pwc == 0) != (res == 0)))
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abort ();
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if (nstate >= (res > 0 ? res : 1))
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abort ();
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res -= nstate;
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pstate[0] = 0;
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return res;
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}
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/* mbtowc does not distinguish between invalid and incomplete multibyte
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sequences. But mbrtowc needs to make this distinction.
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There are two possible approaches:
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- Use iconv() and its return value.
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- Use built-in knowledge about the possible encodings.
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Given the low quality of implementation of iconv() on the systems that
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lack mbrtowc(), we use the second approach.
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The possible encodings are:
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- 8-bit encodings,
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- EUC-JP, EUC-KR, GB2312, EUC-TW, BIG5, GB18030, SJIS,
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- UTF-8.
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Use specialized code for each. */
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if (m >= 4 || m >= MB_CUR_MAX)
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goto invalid;
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/* Here MB_CUR_MAX > 1 and 0 < m < 4. */
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{
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const char *encoding = locale_charset ();
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if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
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{
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/* Cf. unistr/u8-mblen.c. */
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unsigned char c = (unsigned char) p[0];
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if (c >= 0xc2)
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{
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if (c < 0xe0)
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{
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if (m == 1)
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goto incomplete;
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}
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else if (c < 0xf0)
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{
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if (m == 1)
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goto incomplete;
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if (m == 2)
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{
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unsigned char c2 = (unsigned char) p[1];
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if ((c2 ^ 0x80) < 0x40
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&& (c >= 0xe1 || c2 >= 0xa0)
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&& (c != 0xed || c2 < 0xa0))
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goto incomplete;
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}
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}
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else if (c <= 0xf4)
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{
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if (m == 1)
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goto incomplete;
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else /* m == 2 || m == 3 */
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{
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unsigned char c2 = (unsigned char) p[1];
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if ((c2 ^ 0x80) < 0x40
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&& (c >= 0xf1 || c2 >= 0x90)
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&& (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
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{
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if (m == 2)
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goto incomplete;
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else /* m == 3 */
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{
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unsigned char c3 = (unsigned char) p[2];
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if ((c3 ^ 0x80) < 0x40)
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goto incomplete;
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}
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}
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}
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}
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}
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goto invalid;
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}
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/* As a reference for this code, you can use the GNU libiconv
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implementation. Look for uses of the RET_TOOFEW macro. */
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if (STREQ_OPT (encoding,
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"EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0xa1 && c < 0xff) || c == 0x8e || c == 0x8f)
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goto incomplete;
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}
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if (m == 2)
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{
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unsigned char c = (unsigned char) p[0];
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if (c == 0x8f)
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{
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unsigned char c2 = (unsigned char) p[1];
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if (c2 >= 0xa1 && c2 < 0xff)
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goto incomplete;
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}
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}
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goto invalid;
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}
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if (STREQ_OPT (encoding,
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"EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
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|| STREQ_OPT (encoding,
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"GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
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|| STREQ_OPT (encoding,
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"BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if (c >= 0xa1 && c < 0xff)
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goto incomplete;
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}
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goto invalid;
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}
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if (STREQ_OPT (encoding,
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"EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0xa1 && c < 0xff) || c == 0x8e)
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goto incomplete;
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}
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else /* m == 2 || m == 3 */
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{
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unsigned char c = (unsigned char) p[0];
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if (c == 0x8e)
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goto incomplete;
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}
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goto invalid;
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}
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if (STREQ_OPT (encoding,
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"GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0x90 && c <= 0xe3) || (c >= 0xf8 && c <= 0xfe))
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goto incomplete;
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}
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else /* m == 2 || m == 3 */
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{
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unsigned char c = (unsigned char) p[0];
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if (c >= 0x90 && c <= 0xe3)
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{
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unsigned char c2 = (unsigned char) p[1];
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if (c2 >= 0x30 && c2 <= 0x39)
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{
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if (m == 2)
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goto incomplete;
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else /* m == 3 */
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{
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unsigned char c3 = (unsigned char) p[2];
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if (c3 >= 0x81 && c3 <= 0xfe)
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goto incomplete;
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}
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}
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}
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}
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goto invalid;
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}
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if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
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{
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if (m == 1)
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{
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unsigned char c = (unsigned char) p[0];
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if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)
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|| (c >= 0xf0 && c <= 0xf9))
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goto incomplete;
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}
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goto invalid;
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}
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/* An unknown multibyte encoding. */
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goto incomplete;
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}
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incomplete:
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{
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size_t k = nstate;
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/* Here 0 <= k < m < 4. */
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pstate[++k] = s[0];
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if (k < m)
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{
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pstate[++k] = s[1];
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if (k < m)
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pstate[++k] = s[2];
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}
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if (k != m)
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abort ();
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}
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pstate[0] = m;
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return (size_t)(-2);
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invalid:
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errno = EILSEQ;
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/* The conversion state is undefined, says POSIX. */
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return (size_t)(-1);
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}
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}
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}
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#else
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/* Override the system's mbrtowc() function. */
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# undef mbrtowc
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size_t
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rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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{
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# if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG
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if (s == NULL)
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{
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pwc = NULL;
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s = "";
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n = 1;
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}
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# endif
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# if MBRTOWC_RETVAL_BUG
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{
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static mbstate_t internal_state;
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/* Override mbrtowc's internal state. We cannot call mbsinit() on the
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hidden internal state, but we can call it on our variable. */
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if (ps == NULL)
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ps = &internal_state;
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if (!mbsinit (ps))
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{
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/* Parse the rest of the multibyte character byte for byte. */
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size_t count = 0;
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for (; n > 0; s++, n--)
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{
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wchar_t wc;
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size_t ret = mbrtowc (&wc, s, 1, ps);
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if (ret == (size_t)(-1))
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return (size_t)(-1);
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count++;
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if (ret != (size_t)(-2))
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{
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/* The multibyte character has been completed. */
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if (pwc != NULL)
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*pwc = wc;
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return (wc == 0 ? 0 : count);
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}
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}
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return (size_t)(-2);
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}
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}
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# endif
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# if MBRTOWC_NUL_RETVAL_BUG
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{
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wchar_t wc;
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size_t ret = mbrtowc (&wc, s, n, ps);
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if (ret != (size_t)(-1) && ret != (size_t)(-2))
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{
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if (pwc != NULL)
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*pwc = wc;
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if (wc == 0)
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ret = 0;
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}
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return ret;
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}
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# else
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{
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# if MBRTOWC_NULL_ARG1_BUG
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wchar_t dummy;
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if (pwc == NULL)
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pwc = &dummy;
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# endif
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return mbrtowc (pwc, s, n, ps);
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}
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# endif
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}
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#endif
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