kc3-lang/libiconv/lib/utf32be.h

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• Hash : eed6782c
  Author :
  Date : 2024-10-05T02:24:01
  

  Fix undefined behaviour caused by shifting (unsigned char) << 24.
  
  Reported by Tim Sweet <tsweet64@protonmail.com>
  at <https://savannah.gnu.org/bugs/?66289>.
  
  * lib/ucs4.h (ucs4_mbtowc): Cast 'unsigned char' values to ucs4_t before
  shifting them to the left.
  * lib/ucs4be.h (ucs4be_mbtowc): Likewise.
  * lib/ucs4le.h (ucs4le_mbtowc): Likewise.
  * lib/utf32.h (utf32_mbtowc): Likewise.
  * lib/utf32be.h (utf32be_mbtowc): Likewise.
  * lib/utf32le.h (utf32le_mbtowc): Likewise.
  

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• lib/utf32be.h

• /*
   * Copyright (C) 1999-2001, 2016, 2024 Free Software Foundation, Inc.
   * This file is part of the GNU LIBICONV Library.
   *
   * The GNU LIBICONV Library 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.
   *
   * The GNU LIBICONV Library 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 the GNU LIBICONV Library; see the file COPYING.LIB.
   * If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * UTF-32BE
   */
  
  /* Specification: Unicode 3.1 Standard Annex #19 */
  
  static int
  utf32be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    if (n >= 4) {
      ucs4_t wc =   ((ucs4_t) s[0] << 24)
                  + ((ucs4_t) s[1] << 16)
                  + ((ucs4_t) s[2] << 8)
                  +  (ucs4_t) s[3];
      if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
        *pwc = wc;
        return 4;
      } else
        return RET_ILSEQ;
    }
    return RET_TOOFEW(0);
  }
  
  static int
  utf32be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
      if (n >= 4) {
        r[0] = 0;
        r[1] = (unsigned char) (wc >> 16);
        r[2] = (unsigned char) (wc >> 8);
        r[3] = (unsigned char) wc;
        return 4;
      } else
        return RET_TOOSMALL;
    }
    return RET_ILUNI;
  }
  

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