Coverage Report

Created: 2025-03-06 07:58

/src/gnutls/lib/unistring/unistr/u32-to-u8.c
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/* Convert UTF-32 string to 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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#define FUNC u32_to_u8
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#define SRC_UNIT uint32_t
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#define DST_UNIT uint8_t
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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DST_UNIT *
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FUNC (const SRC_UNIT *s, size_t n, DST_UNIT *resultbuf, size_t *lengthp)
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{
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  const SRC_UNIT *s_end = s + n;
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  /* Output string accumulator.  */
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  DST_UNIT *result;
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  size_t allocated;
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  size_t length;
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  if (resultbuf != NULL)
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    {
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      result = resultbuf;
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      allocated = *lengthp;
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    }
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  else
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    {
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      result = NULL;
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      allocated = 0;
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    }
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  length = 0;
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  /* Invariants:
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     result is either == resultbuf or == NULL or malloc-allocated.
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     If length > 0, then result != NULL.  */
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  while (s < s_end)
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    {
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      ucs4_t uc;
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      int count;
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      /* Fetch a Unicode character from the input string.  */
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      uc = *s++;
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      /* No need to call the safe variant u32_mbtouc, because
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         u8_uctomb will verify uc anyway.  */
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      /* Store it in the output string.  */
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      count = u8_uctomb (result + length, uc, allocated - length);
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      if (count == -1)
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        {
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          if (!(result == resultbuf || result == NULL))
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            free (result);
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          errno = EILSEQ;
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          return NULL;
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        }
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      if (count == -2)
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        {
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          DST_UNIT *memory;
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          allocated = (allocated > 0 ? 2 * allocated : 12);
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          if (length + 6 > allocated)
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            allocated = length + 6;
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          if (result == resultbuf || result == NULL)
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            memory = (DST_UNIT *) malloc (allocated * sizeof (DST_UNIT));
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          else
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            memory =
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              (DST_UNIT *) realloc (result, allocated * sizeof (DST_UNIT));
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          if (memory == NULL)
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            {
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              if (!(result == resultbuf || result == NULL))
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                free (result);
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              errno = ENOMEM;
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              return NULL;
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            }
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          if (result == resultbuf && length > 0)
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            memcpy ((char *) memory, (char *) result,
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                    length * sizeof (DST_UNIT));
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          result = memory;
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          count = u8_uctomb (result + length, uc, allocated - length);
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          if (count < 0)
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            abort ();
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        }
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      length += count;
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    }
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  if (length == 0)
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    {
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      if (result == NULL)
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        {
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          /* Return a non-NULL value.  NULL means error.  */
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          result = (DST_UNIT *) malloc (1);
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          if (result == NULL)
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            {
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              errno = ENOMEM;
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              return NULL;
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            }
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        }
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    }
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  else if (result != resultbuf && length < allocated)
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    {
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      /* Shrink the allocated memory if possible.  */
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      DST_UNIT *memory;
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      memory = (DST_UNIT *) realloc (result, length * sizeof (DST_UNIT));
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      if (memory != NULL)
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        result = memory;
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    }
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  *lengthp = length;
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  return result;
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}