+++ /dev/null
-/* Convert multibyte character to wide character.
- Copyright (C) 1999-2002, 2005-2009 Free Software Foundation, Inc.
- Written by Bruno Haible <bruno@clisp.org>, 2008.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-/* Specification. */
-#include <wchar.h>
-
-#if GNULIB_defined_mbstate_t
-/* Implement mbrtowc() on top of mbtowc(). */
-
-# include <errno.h>
-# include <stdlib.h>
-
-# include "localcharset.h"
-# include "streq.h"
-# include "verify.h"
-
-
-verify (sizeof (mbstate_t) >= 4);
-
-static char internal_state[4];
-
-size_t
-mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
-{
- char *pstate = (char *)ps;
-
- if (pstate == NULL)
- pstate = internal_state;
-
- if (s == NULL)
- {
- pwc = NULL;
- s = "";
- n = 1;
- }
-
- if (n == 0)
- return (size_t)(-2);
-
- /* Here n > 0. */
- {
- size_t nstate = pstate[0];
- char buf[4];
- const char *p;
- size_t m;
-
- switch (nstate)
- {
- case 0:
- p = s;
- m = n;
- break;
- case 3:
- buf[2] = pstate[3];
- /*FALLTHROUGH*/
- case 2:
- buf[1] = pstate[2];
- /*FALLTHROUGH*/
- case 1:
- buf[0] = pstate[1];
- p = buf;
- m = nstate;
- buf[m++] = s[0];
- if (n >= 2 && m < 4)
- {
- buf[m++] = s[1];
- if (n >= 3 && m < 4)
- buf[m++] = s[2];
- }
- break;
- default:
- errno = EINVAL;
- return (size_t)(-1);
- }
-
- /* Here m > 0. */
-
-# if __GLIBC__
- /* Work around bug <http://sourceware.org/bugzilla/show_bug.cgi?id=9674> */
- mbtowc (NULL, NULL, 0);
-# endif
- {
- int res = mbtowc (pwc, p, m);
-
- if (res >= 0)
- {
- if (pwc != NULL && ((*pwc == 0) != (res == 0)))
- abort ();
- if (nstate >= (res > 0 ? res : 1))
- abort ();
- res -= nstate;
- pstate[0] = 0;
- return res;
- }
-
- /* mbtowc does not distinguish between invalid and incomplete multibyte
- sequences. But mbrtowc needs to make this distinction.
- There are two possible approaches:
- - Use iconv() and its return value.
- - Use built-in knowledge about the possible encodings.
- Given the low quality of implementation of iconv() on the systems that
- lack mbrtowc(), we use the second approach.
- The possible encodings are:
- - 8-bit encodings,
- - EUC-JP, EUC-KR, GB2312, EUC-TW, BIG5, GB18030, SJIS,
- - UTF-8.
- Use specialized code for each. */
- if (m >= 4 || m >= MB_CUR_MAX)
- goto invalid;
- /* Here MB_CUR_MAX > 1 and 0 < m < 4. */
- {
- const char *encoding = locale_charset ();
-
- if (STREQ (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
- {
- /* Cf. unistr/u8-mblen.c. */
- unsigned char c = (unsigned char) p[0];
-
- if (c >= 0xc2)
- {
- if (c < 0xe0)
- {
- if (m == 1)
- goto incomplete;
- }
- else if (c < 0xf0)
- {
- if (m == 1)
- goto incomplete;
- if (m == 2)
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if ((c2 ^ 0x80) < 0x40
- && (c >= 0xe1 || c2 >= 0xa0)
- && (c != 0xed || c2 < 0xa0))
- goto incomplete;
- }
- }
- else if (c <= 0xf4)
- {
- if (m == 1)
- goto incomplete;
- else /* m == 2 || m == 3 */
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if ((c2 ^ 0x80) < 0x40
- && (c >= 0xf1 || c2 >= 0x90)
- && (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
- {
- if (m == 2)
- goto incomplete;
- else /* m == 3 */
- {
- unsigned char c3 = (unsigned char) p[2];
-
- if ((c3 ^ 0x80) < 0x40)
- goto incomplete;
- }
- }
- }
- }
- }
- goto invalid;
- }
-
- /* As a reference for this code, you can use the GNU libiconv
- implementation. Look for uses of the RET_TOOFEW macro. */
-
- if (STREQ (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0xa1 && c < 0xff) || c == 0x8e || c == 0x8f)
- goto incomplete;
- }
- if (m == 2)
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c == 0x8f)
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if (c2 >= 0xa1 && c2 < 0xff)
- goto incomplete;
- }
- }
- goto invalid;
- }
- if (STREQ (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
- || STREQ (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
- || STREQ (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c >= 0xa1 && c < 0xff)
- goto incomplete;
- }
- goto invalid;
- }
- if (STREQ (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0xa1 && c < 0xff) || c == 0x8e)
- goto incomplete;
- }
- else /* m == 2 || m == 3 */
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c == 0x8e)
- goto incomplete;
- }
- goto invalid;
- }
- if (STREQ (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0x90 && c <= 0xe3) || (c >= 0xf8 && c <= 0xfe))
- goto incomplete;
- }
- else /* m == 2 || m == 3 */
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c >= 0x90 && c <= 0xe3)
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if (c2 >= 0x30 && c2 <= 0x39)
- {
- if (m == 2)
- goto incomplete;
- else /* m == 3 */
- {
- unsigned char c3 = (unsigned char) p[2];
-
- if (c3 >= 0x81 && c3 <= 0xfe)
- goto incomplete;
- }
- }
- }
- }
- goto invalid;
- }
- if (STREQ (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)
- || (c >= 0xf0 && c <= 0xf9))
- goto incomplete;
- }
- goto invalid;
- }
-
- /* An unknown multibyte encoding. */
- goto incomplete;
- }
-
- incomplete:
- {
- size_t k = nstate;
- /* Here 0 <= k < m < 4. */
- pstate[++k] = s[0];
- if (k < m)
- {
- pstate[++k] = s[1];
- if (k < m)
- pstate[++k] = s[2];
- }
- if (k != m)
- abort ();
- }
- pstate[0] = m;
- return (size_t)(-2);
-
- invalid:
- errno = EILSEQ;
- /* The conversion state is undefined, says POSIX. */
- return (size_t)(-1);
- }
- }
-}
-
-#else
-/* Override the system's mbrtowc() function. */
-
-# undef mbrtowc
-
-size_t
-rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
-{
-# if MBRTOWC_NULL_ARG_BUG || MBRTOWC_RETVAL_BUG
- if (s == NULL)
- {
- pwc = NULL;
- s = "";
- n = 1;
- }
-# endif
-
-# if MBRTOWC_RETVAL_BUG
- {
- static mbstate_t internal_state;
-
- /* Override mbrtowc's internal state. We can not call mbsinit() on the
- hidden internal state, but we can call it on our variable. */
- if (ps == NULL)
- ps = &internal_state;
-
- if (!mbsinit (ps))
- {
- /* Parse the rest of the multibyte character byte for byte. */
- size_t count = 0;
- for (; n > 0; s++, n--)
- {
- wchar_t wc;
- size_t ret = mbrtowc (&wc, s, 1, ps);
-
- if (ret == (size_t)(-1))
- return (size_t)(-1);
- count++;
- if (ret != (size_t)(-2))
- {
- /* The multibyte character has been completed. */
- if (pwc != NULL)
- *pwc = wc;
- return (wc == 0 ? 0 : count);
- }
- }
- return (size_t)(-2);
- }
- }
-# endif
-
-# if MBRTOWC_NUL_RETVAL_BUG
- {
- wchar_t wc;
- size_t ret = mbrtowc (&wc, s, n, ps);
-
- if (ret != (size_t)(-1) && ret != (size_t)(-2))
- {
- if (pwc != NULL)
- *pwc = wc;
- if (wc == 0)
- ret = 0;
- }
- return ret;
- }
-# else
- return mbrtowc (pwc, s, n, ps);
-# endif
-}
-
-#endif
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