kc3-lang/gnulib/lib/mbsrtowcs-impl.h

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/mbsrtowcs-impl.h

• /* Convert string to wide string.
     Copyright (C) 2008-2023 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2008.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file 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 Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  size_t
  FUNC (DCHAR_T *dest, const char **srcp, size_t len, mbstate_t *ps)
  {
    if (ps == NULL)
      ps = &INTERNAL_STATE;
    {
      const char *src = *srcp;
  
      if (dest != NULL)
        {
          DCHAR_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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