/src/libidn/lib/gl/striconv.c

Source (jump to first uncovered line)
/* Charset conversion.
   Copyright (C) 2001-2007, 2010-2023 Free Software Foundation, Inc.
   Written by Bruno Haible and Simon Josefsson.

   This file 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.

   This file 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include "striconv.h"

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#if HAVE_ICONV
# include <iconv.h>
/* Get MB_LEN_MAX, CHAR_BIT.  */
# include <limits.h>
#endif

#include "c-strcase.h"

#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif


#if HAVE_ICONV

int
mem_cd_iconv (const char *src, size_t srclen, iconv_t cd,
              char **resultp, size_t *lengthp)
{
# define tmpbufsize 4096
  size_t length;
  char *result;

  /* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
  /* Set to the initial state.  */
  iconv (cd, NULL, NULL, NULL, NULL);
# endif

  /* Determine the length we need.  */
  {
    size_t count = 0;
    /* The alignment is needed when converting e.g. to glibc's WCHAR_T or
       libiconv's UCS-4-INTERNAL encoding.  */
    union { unsigned int align; char buf[tmpbufsize]; } tmp;
# define tmpbuf tmp.buf
    const char *inptr = src;
    size_t insize = srclen;

    while (insize > 0)
      {
        char *outptr = tmpbuf;
        size_t outsize = tmpbufsize;
        size_t res = iconv (cd,
                            (ICONV_CONST char **) &inptr, &insize,
                            &outptr, &outsize);

        if (res == (size_t)(-1))
          {
            if (errno == E2BIG)
              ;
            else if (errno == EINVAL)
              break;
            else
              return -1;
          }
# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
        /* Irix iconv() inserts a NUL byte if it cannot convert.
           NetBSD iconv() inserts a question mark if it cannot convert.
           Only GNU libiconv and GNU libc are known to prefer to fail rather
           than doing a lossy conversion.  */
        else if (res > 0)
          {
            errno = EILSEQ;
            return -1;
          }
# endif
        count += outptr - tmpbuf;
      }
    /* Avoid glibc-2.1 bug and Solaris 2.7 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
    {
      char *outptr = tmpbuf;
      size_t outsize = tmpbufsize;
      size_t res = iconv (cd, NULL, NULL, &outptr, &outsize);

      if (res == (size_t)(-1))
        return -1;
      count += outptr - tmpbuf;
    }
# endif
    length = count;
# undef tmpbuf
  }

  if (length == 0)
    {
      *lengthp = 0;
      return 0;
    }
  if (*resultp != NULL && *lengthp >= length)
    result = *resultp;
  else
    {
      result = (char *) malloc (length);
      if (result == NULL)
        {
          errno = ENOMEM;
          return -1;
        }
    }

  /* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
  /* Return to the initial state.  */
  iconv (cd, NULL, NULL, NULL, NULL);
# endif

  /* Do the conversion for real.  */
  {
    const char *inptr = src;
    size_t insize = srclen;
    char *outptr = result;
    size_t outsize = length;

    while (insize > 0)
      {
        size_t res = iconv (cd,
                            (ICONV_CONST char **) &inptr, &insize,
                            &outptr, &outsize);

        if (res == (size_t)(-1))
          {
            if (errno == EINVAL)
              break;
            else
              goto fail;
          }
# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
        /* Irix iconv() inserts a NUL byte if it cannot convert.
           NetBSD iconv() inserts a question mark if it cannot convert.
           Only GNU libiconv and GNU libc are known to prefer to fail rather
           than doing a lossy conversion.  */
        else if (res > 0)
          {
            errno = EILSEQ;
            goto fail;
          }
# endif
      }
    /* Avoid glibc-2.1 bug and Solaris 2.7 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
    {
      size_t res = iconv (cd, NULL, NULL, &outptr, &outsize);

      if (res == (size_t)(-1))
        goto fail;
    }
# endif
    if (outsize != 0)
      abort ();
  }

  *resultp = result;
  *lengthp = length;

  return 0;

 fail:
  {
    if (result != *resultp)
      free (result);
    return -1;
  }
# undef tmpbufsize
}

char *
str_cd_iconv (const char *src, iconv_t cd)
{
  /* For most encodings, a trailing NUL byte in the input will be converted
     to a trailing NUL byte in the output.  But not for UTF-7.  So that this
     function is usable for UTF-7, we have to exclude the NUL byte from the
     conversion and add it by hand afterwards.  */
# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
  /* Irix iconv() inserts a NUL byte if it cannot convert.
     NetBSD iconv() inserts a question mark if it cannot convert.
     Only GNU libiconv and GNU libc are known to prefer to fail rather
     than doing a lossy conversion.  For other iconv() implementations,
     we have to look at the number of irreversible conversions returned;
     but this information is lost when iconv() returns for an E2BIG reason.
     Therefore we cannot use the second, faster algorithm.  */

  char *result = NULL;
  size_t length = 0;
  int retval = mem_cd_iconv (src, strlen (src), cd, &result, &length);
  char *final_result;

  if (retval < 0)
    {
      if (result != NULL)
        abort ();
      return NULL;
    }

  /* Add the terminating NUL byte.  */
  final_result =
    (result != NULL ? realloc (result, length + 1) : malloc (length + 1));
  if (final_result == NULL)
    {
      free (result);
      errno = ENOMEM;
      return NULL;
    }
  final_result[length] = '\0';

  return final_result;

# else
  /* This algorithm is likely faster than the one above.  But it may produce
     iconv() returns for an E2BIG reason, when the output size guess is too
     small.  Therefore it can only be used when we don't need the number of
     irreversible conversions performed.  */
  char *result;
  size_t result_size;
  size_t length;
  const char *inptr = src;
  size_t inbytes_remaining = strlen (src);

  /* Make a guess for the worst-case output size, in order to avoid a
     realloc.  It's OK if the guess is wrong as long as it is not zero and
     doesn't lead to an integer overflow.  */
  result_size = inbytes_remaining;
  {
    size_t approx_sqrt_SIZE_MAX = SIZE_MAX >> (sizeof (size_t) * CHAR_BIT / 2);
    if (result_size <= approx_sqrt_SIZE_MAX / MB_LEN_MAX)
      result_size *= MB_LEN_MAX;
  }
  result_size += 1; /* for the terminating NUL */

  result = (char *) malloc (result_size);
  if (result == NULL)
    {
      errno = ENOMEM;
      return NULL;
    }

  /* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
  /* Set to the initial state.  */
  iconv (cd, NULL, NULL, NULL, NULL);
# endif

  /* Do the conversion.  */
  {
    char *outptr = result;
    size_t outbytes_remaining = result_size - 1;

    for (;;)
      {
        /* Here inptr + inbytes_remaining = src + strlen (src),
                outptr + outbytes_remaining = result + result_size - 1.  */
        size_t res = iconv (cd,
                            (ICONV_CONST char **) &inptr, &inbytes_remaining,
                            &outptr, &outbytes_remaining);

        if (res == (size_t)(-1))
          {
            if (errno == EINVAL)
              break;
            else if (errno == E2BIG)
              {
                size_t used = outptr - result;
                size_t newsize = result_size * 2;
                char *newresult;

                if (!(newsize > result_size))
                  {
                    errno = ENOMEM;
                    goto failed;
                  }
                newresult = (char *) realloc (result, newsize);
                if (newresult == NULL)
                  {
                    errno = ENOMEM;
                    goto failed;
                  }
                result = newresult;
                result_size = newsize;
                outptr = result + used;
                outbytes_remaining = result_size - 1 - used;
              }
            else
              goto failed;
          }
        else
          break;
      }
    /* Avoid glibc-2.1 bug and Solaris 2.7 bug.  */
# if defined _LIBICONV_VERSION \
     || !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
          || defined __sun)
    for (;;)
      {
        /* Here outptr + outbytes_remaining = result + result_size - 1.  */
        size_t res = iconv (cd, NULL, NULL, &outptr, &outbytes_remaining);

        if (res == (size_t)(-1))
          {
            if (errno == E2BIG)
              {
                size_t used = outptr - result;
                size_t newsize = result_size * 2;
                char *newresult;

                if (!(newsize > result_size))
                  {
                    errno = ENOMEM;
                    goto failed;
                  }
                newresult = (char *) realloc (result, newsize);
                if (newresult == NULL)
                  {
                    errno = ENOMEM;
                    goto failed;
                  }
                result = newresult;
                result_size = newsize;
                outptr = result + used;
                outbytes_remaining = result_size - 1 - used;
              }
            else
              goto failed;
          }
        else
          break;
      }
# endif

    /* Add the terminating NUL byte.  */
    *outptr++ = '\0';

    length = outptr - result;
  }

  /* Give away unused memory.  */
  if (length < result_size)
    {
      char *smaller_result = (char *) realloc (result, length);

      if (smaller_result != NULL)
        result = smaller_result;
    }

  return result;

 failed:
  free (result);
  return NULL;

# endif
}

#endif

char *
str_iconv (const char *src, const char *from_codeset, const char *to_codeset)
{
  if (*src == '\0' || c_strcasecmp (from_codeset, to_codeset) == 0)
    {
      char *result = strdup (src);

      if (result == NULL)
        errno = ENOMEM;
      return result;
    }
  else
    {
#if HAVE_ICONV
      iconv_t cd;
      char *result;

      /* Avoid glibc-2.1 bug with EUC-KR.  */
# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
     && !defined _LIBICONV_VERSION
      if (c_strcasecmp (from_codeset, "EUC-KR") == 0
          || c_strcasecmp (to_codeset, "EUC-KR") == 0)
        {
          errno = EINVAL;
          return NULL;
        }
# endif
      cd = iconv_open (to_codeset, from_codeset);
      if (cd == (iconv_t) -1)
        return NULL;

      result = str_cd_iconv (src, cd);

      if (result == NULL)
        {
          /* Close cd, but preserve the errno from str_cd_iconv.  */
          int saved_errno = errno;
          iconv_close (cd);
          errno = saved_errno;
        }
      else
        {
          if (iconv_close (cd) < 0)
            {
              free (result);
              return NULL;
            }
        }
      return result;
#else
      /* This is a different error code than if iconv_open existed but didn't
         support from_codeset and to_codeset, so that the caller can emit
         an error message such as
           "iconv() is not supported. Installing GNU libiconv and
            then reinstalling this package would fix this."  */
      errno = ENOSYS;
      return NULL;
#endif
    }
}

Coverage Report

Created: 2023-06-07 07:17

Line	Count	Source (jump to first uncovered line)
1		/* Charset conversion.
2		Copyright (C) 2001-2007, 2010-2023 Free Software Foundation, Inc.
3		Written by Bruno Haible and Simon Josefsson.
4
5		This file is free software: you can redistribute it and/or modify
6		it under the terms of the GNU Lesser General Public License as
7		published by the Free Software Foundation; either version 2.1 of the
8		License, or (at your option) any later version.
9
10		This file is distributed in the hope that it will be useful,
11		but WITHOUT ANY WARRANTY; without even the implied warranty of
12		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13		GNU Lesser General Public License for more details.
14
15		You should have received a copy of the GNU Lesser General Public License
16		along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18		#include <config.h>
19
20		/* Specification. */
21		#include "striconv.h"
22
23		#include <errno.h>
24		#include <stdlib.h>
25		#include <string.h>
26
27		#if HAVE_ICONV
28		# include <iconv.h>
29		/* Get MB_LEN_MAX, CHAR_BIT. */
30		# include <limits.h>
31		#endif
32
33		#include "c-strcase.h"
34
35		#ifndef SIZE_MAX
36	0	# define SIZE_MAX ((size_t) -1)
37		#endif
38
39
40		#if HAVE_ICONV
41
42		int
43		mem_cd_iconv (const char *src, size_t srclen, iconv_t cd,
44		char *resultp, size_t lengthp)
45	0	{
46	0	# define tmpbufsize 4096
47	0	size_t length;
48	0	char *result;
49
50		/* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug. */
51	0	# if defined _LIBICONV_VERSION \
52	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
53	0	\|\| defined __sun)
54		/* Set to the initial state. */
55	0	iconv (cd, NULL, NULL, NULL, NULL);
56	0	# endif
57
58		/* Determine the length we need. */
59	0	{
60	0	size_t count = 0;
61		/* The alignment is needed when converting e.g. to glibc's WCHAR_T or
62		libiconv's UCS-4-INTERNAL encoding. */
63	0	union { unsigned int align; char buf[tmpbufsize]; } tmp;
64	0	# define tmpbuf tmp.buf
65	0	const char *inptr = src;
66	0	size_t insize = srclen;
67
68	0	while (insize > 0)
69	0	{
70	0	char *outptr = tmpbuf;
71	0	size_t outsize = tmpbufsize;
72	0	size_t res = iconv (cd,
73	0	(ICONV_CONST char **) &inptr, &insize,
74	0	&outptr, &outsize);
75
76	0	if (res == (size_t)(-1))
77	0	{
78	0	if (errno == E2BIG)
79	0	;
80	0	else if (errno == EINVAL)
81	0	break;
82	0	else
83	0	return -1;
84	0	}
85		# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
86		/* Irix iconv() inserts a NUL byte if it cannot convert.
87		NetBSD iconv() inserts a question mark if it cannot convert.
88		Only GNU libiconv and GNU libc are known to prefer to fail rather
89		than doing a lossy conversion. */
90		else if (res > 0)
91		{
92		errno = EILSEQ;
93		return -1;
94		}
95		# endif
96	0	count += outptr - tmpbuf;
97	0	}
98		/* Avoid glibc-2.1 bug and Solaris 2.7 bug. */
99	0	# if defined _LIBICONV_VERSION \
100	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
101	0	\|\| defined __sun)
102	0	{
103	0	char *outptr = tmpbuf;
104	0	size_t outsize = tmpbufsize;
105	0	size_t res = iconv (cd, NULL, NULL, &outptr, &outsize);
106
107	0	if (res == (size_t)(-1))
108	0	return -1;
109	0	count += outptr - tmpbuf;
110	0	}
111	0	# endif
112	0	length = count;
113	0	# undef tmpbuf
114	0	}
115
116	0	if (length == 0)
117	0	{
118	0	*lengthp = 0;
119	0	return 0;
120	0	}
121	0	if (resultp != NULL && lengthp >= length)
122	0	result = *resultp;
123	0	else
124	0	{
125	0	result = (char *) malloc (length);
126	0	if (result == NULL)
127	0	{
128	0	errno = ENOMEM;
129	0	return -1;
130	0	}
131	0	}
132
133		/* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug. */
134	0	# if defined _LIBICONV_VERSION \
135	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
136	0	\|\| defined __sun)
137		/* Return to the initial state. */
138	0	iconv (cd, NULL, NULL, NULL, NULL);
139	0	# endif
140
141		/* Do the conversion for real. */
142	0	{
143	0	const char *inptr = src;
144	0	size_t insize = srclen;
145	0	char *outptr = result;
146	0	size_t outsize = length;
147
148	0	while (insize > 0)
149	0	{
150	0	size_t res = iconv (cd,
151	0	(ICONV_CONST char **) &inptr, &insize,
152	0	&outptr, &outsize);
153
154	0	if (res == (size_t)(-1))
155	0	{
156	0	if (errno == EINVAL)
157	0	break;
158	0	else
159	0	goto fail;
160	0	}
161		# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
162		/* Irix iconv() inserts a NUL byte if it cannot convert.
163		NetBSD iconv() inserts a question mark if it cannot convert.
164		Only GNU libiconv and GNU libc are known to prefer to fail rather
165		than doing a lossy conversion. */
166		else if (res > 0)
167		{
168		errno = EILSEQ;
169		goto fail;
170		}
171		# endif
172	0	}
173		/* Avoid glibc-2.1 bug and Solaris 2.7 bug. */
174	0	# if defined _LIBICONV_VERSION \
175	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
176	0	\|\| defined __sun)
177	0	{
178	0	size_t res = iconv (cd, NULL, NULL, &outptr, &outsize);
179
180	0	if (res == (size_t)(-1))
181	0	goto fail;
182	0	}
183	0	# endif
184	0	if (outsize != 0)
185	0	abort ();
186	0	}
187
188	0	*resultp = result;
189	0	*lengthp = length;
190
191	0	return 0;
192
193	0	fail:
194	0	{
195	0	if (result != *resultp)
196	0	free (result);
197	0	return -1;
198	0	}
199	0	# undef tmpbufsize
200	0	}
201
202		char *
203		str_cd_iconv (const char *src, iconv_t cd)
204	0	{
205		/* For most encodings, a trailing NUL byte in the input will be converted
206		to a trailing NUL byte in the output. But not for UTF-7. So that this
207		function is usable for UTF-7, we have to exclude the NUL byte from the
208		conversion and add it by hand afterwards. */
209		# if !defined _LIBICONV_VERSION && !(defined __GLIBC__ && !defined __UCLIBC__)
210		/* Irix iconv() inserts a NUL byte if it cannot convert.
211		NetBSD iconv() inserts a question mark if it cannot convert.
212		Only GNU libiconv and GNU libc are known to prefer to fail rather
213		than doing a lossy conversion. For other iconv() implementations,
214		we have to look at the number of irreversible conversions returned;
215		but this information is lost when iconv() returns for an E2BIG reason.
216		Therefore we cannot use the second, faster algorithm. */
217
218		char *result = NULL;
219		size_t length = 0;
220		int retval = mem_cd_iconv (src, strlen (src), cd, &result, &length);
221		char *final_result;
222
223		if (retval < 0)
224		{
225		if (result != NULL)
226		abort ();
227		return NULL;
228		}
229
230		/* Add the terminating NUL byte. */
231		final_result =
232		(result != NULL ? realloc (result, length + 1) : malloc (length + 1));
233		if (final_result == NULL)
234		{
235		free (result);
236		errno = ENOMEM;
237		return NULL;
238		}
239		final_result[length] = '\0';
240
241		return final_result;
242
243		# else
244		/* This algorithm is likely faster than the one above. But it may produce
245		iconv() returns for an E2BIG reason, when the output size guess is too
246		small. Therefore it can only be used when we don't need the number of
247		irreversible conversions performed. */
248	0	char *result;
249	0	size_t result_size;
250	0	size_t length;
251	0	const char *inptr = src;
252	0	size_t inbytes_remaining = strlen (src);
253
254		/* Make a guess for the worst-case output size, in order to avoid a
255		realloc. It's OK if the guess is wrong as long as it is not zero and
256		doesn't lead to an integer overflow. */
257	0	result_size = inbytes_remaining;
258	0	{
259	0	size_t approx_sqrt_SIZE_MAX = SIZE_MAX >> (sizeof (size_t) * CHAR_BIT / 2);
260	0	if (result_size <= approx_sqrt_SIZE_MAX / MB_LEN_MAX)
261	0	result_size *= MB_LEN_MAX;
262	0	}
263	0	result_size += 1; /* for the terminating NUL */
264
265	0	result = (char *) malloc (result_size);
266	0	if (result == NULL)
267	0	{
268	0	errno = ENOMEM;
269	0	return NULL;
270	0	}
271
272		/* Avoid glibc-2.1 bug and Solaris 2.7-2.9 bug. */
273	0	# if defined _LIBICONV_VERSION \
274	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
275	0	\|\| defined __sun)
276		/* Set to the initial state. */
277	0	iconv (cd, NULL, NULL, NULL, NULL);
278	0	# endif
279
280		/* Do the conversion. */
281	0	{
282	0	char *outptr = result;
283	0	size_t outbytes_remaining = result_size - 1;
284
285	0	for (;;)
286	0	{
287		/* Here inptr + inbytes_remaining = src + strlen (src),
288		outptr + outbytes_remaining = result + result_size - 1. */
289	0	size_t res = iconv (cd,
290	0	(ICONV_CONST char **) &inptr, &inbytes_remaining,
291	0	&outptr, &outbytes_remaining);
292
293	0	if (res == (size_t)(-1))
294	0	{
295	0	if (errno == EINVAL)
296	0	break;
297	0	else if (errno == E2BIG)
298	0	{
299	0	size_t used = outptr - result;
300	0	size_t newsize = result_size * 2;
301	0	char *newresult;
302
303	0	if (!(newsize > result_size))
304	0	{
305	0	errno = ENOMEM;
306	0	goto failed;
307	0	}
308	0	newresult = (char *) realloc (result, newsize);
309	0	if (newresult == NULL)
310	0	{
311	0	errno = ENOMEM;
312	0	goto failed;
313	0	}
314	0	result = newresult;
315	0	result_size = newsize;
316	0	outptr = result + used;
317	0	outbytes_remaining = result_size - 1 - used;
318	0	}
319	0	else
320	0	goto failed;
321	0	}
322	0	else
323	0	break;
324	0	}
325		/* Avoid glibc-2.1 bug and Solaris 2.7 bug. */
326	0	# if defined _LIBICONV_VERSION \
327	0	\|\| !(((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
328	0	\|\| defined __sun)
329	0	for (;;)
330	0	{
331		/* Here outptr + outbytes_remaining = result + result_size - 1. */
332	0	size_t res = iconv (cd, NULL, NULL, &outptr, &outbytes_remaining);
333
334	0	if (res == (size_t)(-1))
335	0	{
336	0	if (errno == E2BIG)
337	0	{
338	0	size_t used = outptr - result;
339	0	size_t newsize = result_size * 2;
340	0	char *newresult;
341
342	0	if (!(newsize > result_size))
343	0	{
344	0	errno = ENOMEM;
345	0	goto failed;
346	0	}
347	0	newresult = (char *) realloc (result, newsize);
348	0	if (newresult == NULL)
349	0	{
350	0	errno = ENOMEM;
351	0	goto failed;
352	0	}
353	0	result = newresult;
354	0	result_size = newsize;
355	0	outptr = result + used;
356	0	outbytes_remaining = result_size - 1 - used;
357	0	}
358	0	else
359	0	goto failed;
360	0	}
361	0	else
362	0	break;
363	0	}
364	0	# endif
365
366		/* Add the terminating NUL byte. */
367	0	*outptr++ = '\0';
368
369	0	length = outptr - result;
370	0	}
371
372		/* Give away unused memory. */
373	0	if (length < result_size)
374	0	{
375	0	char smaller_result = (char ) realloc (result, length);
376
377	0	if (smaller_result != NULL)
378	0	result = smaller_result;
379	0	}
380
381	0	return result;
382
383	0	failed:
384	0	free (result);
385	0	return NULL;
386
387	0	# endif
388	0	}
389
390		#endif
391
392		char *
393		str_iconv (const char src, const char from_codeset, const char *to_codeset)
394	0	{
395	0	if (*src == '\0' \|\| c_strcasecmp (from_codeset, to_codeset) == 0)
396	0	{
397	0	char *result = strdup (src);
398
399	0	if (result == NULL)
400	0	errno = ENOMEM;
401	0	return result;
402	0	}
403	0	else
404	0	{
405	0	#if HAVE_ICONV
406	0	iconv_t cd;
407	0	char *result;
408
409		/* Avoid glibc-2.1 bug with EUC-KR. */
410		# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ <= 1) && !defined __UCLIBC__) \
411		&& !defined _LIBICONV_VERSION
412		if (c_strcasecmp (from_codeset, "EUC-KR") == 0
413		\|\| c_strcasecmp (to_codeset, "EUC-KR") == 0)
414		{
415		errno = EINVAL;
416		return NULL;
417		}
418		# endif
419	0	cd = iconv_open (to_codeset, from_codeset);
420	0	if (cd == (iconv_t) -1)
421	0	return NULL;
422
423	0	result = str_cd_iconv (src, cd);
424
425	0	if (result == NULL)
426	0	{
427		/* Close cd, but preserve the errno from str_cd_iconv. */
428	0	int saved_errno = errno;
429	0	iconv_close (cd);
430	0	errno = saved_errno;
431	0	}
432	0	else
433	0	{
434	0	if (iconv_close (cd) < 0)
435	0	{
436	0	free (result);
437	0	return NULL;
438	0	}
439	0	}
440	0	return result;
441		#else
442		/* This is a different error code than if iconv_open existed but didn't
443		support from_codeset and to_codeset, so that the caller can emit
444		an error message such as
445		"iconv() is not supported. Installing GNU libiconv and
446		then reinstalling this package would fix this." */
447		errno = ENOSYS;
448		return NULL;
449		#endif
450	0	}
451	0	}