Coverage Report

Created: 2025-03-06 07:58

/src/gnutls/lib/unistring/unistr/u8-check.c
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Source (jump to first uncovered line)
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/* Check UTF-8 string.
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   Copyright (C) 2002, 2006-2007, 2009-2025 Free Software Foundation, Inc.
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   Written by Bruno Haible <bruno@clisp.org>, 2002.
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   This file is free software: you can redistribute it and/or modify
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   it under the terms of the GNU Lesser General Public License as
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   published by the Free Software Foundation; either version 2.1 of the
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   License, or (at your option) any later version.
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   This file is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public License
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   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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/* Specification.  */
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#include "unistr.h"
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const uint8_t *
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u8_check (const uint8_t *s, size_t n)
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0
{
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0
  const uint8_t *s_end = s + n;
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  while (s < s_end)
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    {
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      /* Keep in sync with unistr.h and u8-mbtouc-aux.c.  */
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      uint8_t c = *s;
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      if (c < 0x80)
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        {
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          s++;
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          continue;
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        }
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      if (c >= 0xc2)
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        {
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          if (c < 0xe0)
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            {
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              if (s + 2 <= s_end
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                  && (s[1] ^ 0x80) < 0x40)
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                {
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                  s += 2;
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                  continue;
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                }
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0
            }
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          else if (c < 0xf0)
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            {
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              if (s + 3 <= s_end
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                  && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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                  && (c >= 0xe1 || s[1] >= 0xa0)
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                  && (c != 0xed || s[1] < 0xa0))
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                {
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0
                  s += 3;
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                  continue;
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0
                }
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0
            }
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0
          else if (c <= 0xf4)
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            {
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              if (s + 4 <= s_end
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                  && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
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                  && (s[3] ^ 0x80) < 0x40
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                  && (c >= 0xf1 || s[1] >= 0x90)
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                  && (c < 0xf4 || (/* c == 0xf4 && */ s[1] < 0x90)))
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                {
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                  s += 4;
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                  continue;
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                }
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            }
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        }
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      /* invalid or incomplete multibyte character */
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      return s;
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0
    }
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  return NULL;
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}