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mbsrtowcs.c

/* Convert string to wide string.
   Copyright (C) 2008 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>

#include <errno.h>
#include <limits.h>
#include <stdlib.h>

#include "strnlen1.h"


extern mbstate_t _gl_mbsrtowcs_state;

size_t
mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps)
{
  if (ps == NULL)
    ps = &_gl_mbsrtowcs_state;
  {
    const char *src = *srcp;

    if (dest != NULL)
      {
      wchar_t *destptr = dest;

      for (; len > 0; destptr++, len--)
        {
          size_t src_avail;
          size_t ret;

          /* An optimized variant of
             src_avail = strnlen1 (src, MB_LEN_MAX);  */
          if (src[0] == '\0')
            src_avail = 1;
          else if (src[1] == '\0')
            src_avail = 2;
          else if (src[2] == '\0')
            src_avail = 3;
          else if (MB_LEN_MAX <= 4 || src[3] == '\0')
            src_avail = 4;
          else
            src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);

          /* Parse the next multibyte character.  */
          ret = mbrtowc (destptr, src, src_avail, ps);

          if (ret == (size_t)(-2))
            /* Encountered a multibyte character that extends past a '\0' byte
             or that is longer than MB_LEN_MAX bytes.  Cannot happen.  */
            abort ();

          if (ret == (size_t)(-1))
            goto bad_input;
          if (ret == 0)
            {
            src = NULL;
            /* Here mbsinit (ps).  */
            break;
            }
          src += ret;
        }

      *srcp = src;
      return destptr - dest;
      }
    else
      {
      /* Ignore dest and len, don't store *srcp at the end, and
         don't clobber *ps.  */
      mbstate_t state = *ps;
      size_t totalcount = 0;

      for (;; totalcount++)
        {
          size_t src_avail;
          size_t ret;

          /* An optimized variant of
             src_avail = strnlen1 (src, MB_LEN_MAX);  */
          if (src[0] == '\0')
            src_avail = 1;
          else if (src[1] == '\0')
            src_avail = 2;
          else if (src[2] == '\0')
            src_avail = 3;
          else if (MB_LEN_MAX <= 4 || src[3] == '\0')
            src_avail = 4;
          else
            src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);

          /* Parse the next multibyte character.  */
          ret = mbrtowc (NULL, src, src_avail, &state);

          if (ret == (size_t)(-2))
            /* Encountered a multibyte character that extends past a '\0' byte
             or that is longer than MB_LEN_MAX bytes.  Cannot happen.  */
            abort ();

          if (ret == (size_t)(-1))
            goto bad_input2;
          if (ret == 0)
            {
            /* Here mbsinit (&state).  */
            break;
            }
          src += ret;
        }

      return totalcount;
      }

   bad_input:
    *srcp = src;
   bad_input2:
    errno = EILSEQ;
    return (size_t)(-1);
  }
}

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