+
−/* Convert multibyte character to wide character.
+
−   Copyright (C) 1999-2002, 2005-2013 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 (s == NULL)
+
−    {
+
−      pwc = NULL;
+
−      s = "";
+
−      n = 1;
+
−    }
+
−
+
−  if (n == 0)
+
−    return (size_t)(-2);
+
−
+
−  /* Here n > 0.  */
+
−
+
−  if (pstate == NULL)
+
−    pstate = internal_state;
+
−
+
−  {
+
−    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__ || defined __UCLIBC__
+
−    /* 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_OPT (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_OPT (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_OPT (encoding,
+
−                       "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
+
−            || STREQ_OPT (encoding,
+
−                          "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
+
−            || STREQ_OPT (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_OPT (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_OPT (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_OPT (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_ARG2_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 cannot 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
+
−  {
+
−#   if MBRTOWC_NULL_ARG1_BUG
+
−    wchar_t dummy;
+
−
+
−    if (pwc == NULL)
+
−      pwc = &dummy;
+
−#   endif
+
−
+
−    return mbrtowc (pwc, s, n, ps);
+
−  }
+
−# endif
+
−}
+
−
+
−#endif