1/* Conversion from UTF-8 to legacy encodings.
2   Copyright (C) 2002, 2006-2007, 2009-2010 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 <http://www.gnu.org/licenses/>.  */
16
17/* Written by Bruno Haible <bruno@clisp.org>.  */
18
19#include <config.h>
20
21/* Specification.  */
22#include "uniconv.h"
23
24#include <errno.h>
25#include <stdlib.h>
26#include <string.h>
27
28#include "c-strcaseeq.h"
29#include "striconveha.h"
30#include "unistr.h"
31
32char *
33u8_conv_to_encoding (const char *tocode,
34                     enum iconv_ilseq_handler handler,
35                     const uint8_t *src, size_t srclen,
36                     size_t *offsets,
37                     char *resultbuf, size_t *lengthp)
38{
39  if (STRCASEEQ (tocode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
40    {
41      char *result;
42
43      /* Conversion from UTF-8 to UTF-8.  No need to go through iconv().  */
44#if CONFIG_UNICODE_SAFETY
45      if (u8_check (src, srclen))
46        {
47          errno = EILSEQ;
48          return NULL;
49        }
50#endif
51
52      /* Memory allocation.  */
53      if (resultbuf != NULL && *lengthp >= srclen)
54        result = resultbuf;
55      else
56        {
57          result = (char *) malloc (srclen > 0 ? srclen : 1);
58          if (result == NULL)
59            {
60              errno = ENOMEM;
61              return NULL;
62            }
63        }
64
65      memcpy (result, (const char *) src, srclen);
66      *lengthp = srclen;
67      return result;
68    }
69  else
70    {
71      char *result = resultbuf;
72      size_t length = *lengthp;
73
74      if (mem_iconveha ((const char *) src, srclen,
75                        "UTF-8", tocode,
76                        handler == iconveh_question_mark, handler,
77                        offsets, &result, &length) < 0)
78        return NULL;
79
80      if (result == NULL) /* when (resultbuf == NULL && length == 0)  */
81        {
82          result = (char *) malloc (1);
83          if (result == NULL)
84            {
85              errno = ENOMEM;
86              return NULL;
87            }
88        }
89      *lengthp = length;
90      return result;
91    }
92}
93