kc3-lang/gnulib/lib/unistr/u8-mbtouc-unsafe.c

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

  maint: run 'make update-copyright'
  

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• lib/unistr/u8-mbtouc-unsafe.c

• /* Look at first character in UTF-8 string.
     Copyright (C) 1999-2002, 2006-2007, 2009-2023 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2001.
  
     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/>.  */
  
  #include <config.h>
  
  #if defined IN_LIBUNISTRING
  /* Tell unistr.h to declare u8_mbtouc_unsafe as 'extern', not
     'static inline'.  */
  # include "unistring-notinline.h"
  #endif
  
  /* Specification.  */
  #include "unistr.h"
  
  #if !HAVE_INLINE
  
  int
  u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n)
  {
    uint8_t c = *s;
  
    if (c < 0x80)
      {
        *puc = c;
        return 1;
      }
    else if (c >= 0xc2)
      {
        if (c < 0xe0)
          {
            if (n >= 2)
              {
                if ((s[1] ^ 0x80) < 0x40)
                  {
                    *puc = ((unsigned int) (c & 0x1f) << 6)
                           | (unsigned int) (s[1] ^ 0x80);
                    return 2;
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                return 1;
              }
          }
        else if (c < 0xf0)
          {
            if (n >= 3)
              {
                if ((s[1] ^ 0x80) < 0x40)
                  {
                    if ((s[2] ^ 0x80) < 0x40)
                      {
                        if ((c >= 0xe1 || s[1] >= 0xa0)
                            && (c != 0xed || s[1] < 0xa0))
                          {
                            *puc = ((unsigned int) (c & 0x0f) << 12)
                                   | ((unsigned int) (s[1] ^ 0x80) << 6)
                                   | (unsigned int) (s[2] ^ 0x80);
                            return 3;
                          }
                        /* invalid multibyte character */
                        *puc = 0xfffd;
                        return 3;
                      }
                    /* invalid multibyte character */
                    *puc = 0xfffd;
                    return 2;
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                if (n == 1 || (s[1] ^ 0x80) >= 0x40)
                  return 1;
                else
                  return 2;
              }
          }
        else if (c < 0xf8)
          {
            if (n >= 4)
              {
                if ((s[1] ^ 0x80) < 0x40)
                  {
                    if ((s[2] ^ 0x80) < 0x40)
                      {
                        if ((s[3] ^ 0x80) < 0x40)
                          {
                            if ((c >= 0xf1 || s[1] >= 0x90)
                                && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
                               )
                              {
                                *puc = ((unsigned int) (c & 0x07) << 18)
                                       | ((unsigned int) (s[1] ^ 0x80) << 12)
                                       | ((unsigned int) (s[2] ^ 0x80) << 6)
                                       | (unsigned int) (s[3] ^ 0x80);
                                return 4;
                              }
                            /* invalid multibyte character */
                            *puc = 0xfffd;
                            return 4;
                          }
                        /* invalid multibyte character */
                        *puc = 0xfffd;
                        return 3;
                      }
                    /* invalid multibyte character */
                    *puc = 0xfffd;
                    return 2;
                  }
                /* invalid multibyte character */
              }
            else
              {
                /* incomplete multibyte character */
                *puc = 0xfffd;
                if (n == 1 || (s[1] ^ 0x80) >= 0x40)
                  return 1;
                else if (n == 2 || (s[2] ^ 0x80) >= 0x40)
                  return 2;
                else
                  return 3;
              }
          }
      }
    /* invalid multibyte character */
    *puc = 0xfffd;
    return 1;
  }
  
  #endif
  

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