lib/uniconv/u-strconv-to-enc.h

   1 /* Conversion from UTF-16/UTF-32 to legacy encodings.
   2    Copyright (C) 2002, 2006-2007, 2009-2019 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify it
   5    under the terms of the GNU Lesser General Public License as published
   6    by the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 char *
  18 FUNC (const UNIT *string,
  19       const char *tocode,
  20       enum iconv_ilseq_handler handler)
  21 {
  22 #if HAVE_UTF_NAME
  23   char *result = NULL;
  24   size_t length = 0;
  25
  26   if (mem_iconveha ((const char *) string, (U_STRLEN (string) + 1) * sizeof (UNIT),
  27                     UTF_NAME, tocode,
  28                     handler == iconveh_question_mark, handler,
  29                     NULL, &result, &length) < 0)
  30     return NULL;
  31   /* Verify the result has exactly one NUL byte, at the end.  */
  32   if (!(length > 0 && result[length-1] == '\0' && strlen (result) == length-1))
  33     {
  34       free (result);
  35       errno = EILSEQ;
  36       return NULL;
  37     }
  38   return result;
  39 #else
  40   uint8_t tmpbuf[4096];
  41   size_t tmpbufsize = SIZEOF (tmpbuf);
  42   uint8_t *utf8_string;
  43   char *result;
  44
  45   utf8_string = U_TO_U8 (string, U_STRLEN (string) + 1, tmpbuf, &tmpbufsize);
  46   if (utf8_string == NULL)
  47     return NULL;
  48   result = u8_strconv_to_encoding (utf8_string, tocode, handler);
  49   if (result == NULL)
  50     {
  51       if (utf8_string != tmpbuf)
  52         {
  53           int saved_errno = errno;
  54           free (utf8_string);
  55           errno = saved_errno;
  56         }
  57       return NULL;
  58     }
  59   if (utf8_string != tmpbuf)
  60     free (utf8_string);
  61   return result;
  62 #endif
  63 }