/src/CMake/Utilities/cmcurl/lib/idn.c

Source
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
/*
 * IDN conversions
 */
#include "curl_setup.h"

#include "urldata.h"
#include "idn.h"

#ifdef USE_LIBIDN2
#include <idn2.h>

#if defined(_WIN32) && defined(UNICODE)
#define IDN2_LOOKUP(name, host, flags)                                  \
  idn2_lookup_u8((const uint8_t *)name, (uint8_t **)host, flags)
#else
#define IDN2_LOOKUP(name, host, flags)                          \
  idn2_lookup_ul((const char *)(name), (char **)(host), flags)
#endif
#endif /* USE_LIBIDN2 */

/* for macOS and iOS targets */
#ifdef USE_APPLE_IDN
#include <unicode/uidna.h>
#include <iconv.h>
#include <langinfo.h>

#define MAX_HOST_LENGTH 512

static CURLcode iconv_to_utf8(const char *in, size_t inlen,
                              char **out, size_t *outlen)
{
  iconv_t cd = iconv_open("UTF-8", nl_langinfo(CODESET));
  if(cd != (iconv_t)-1) {
    size_t iconv_outlen = *outlen;
    char *iconv_in = (char *)CURL_UNCONST(in);
    size_t iconv_inlen = inlen;
    size_t iconv_result = iconv(cd, &iconv_in, &iconv_inlen,
                                out, &iconv_outlen);
    *outlen -= iconv_outlen;
    iconv_close(cd);
    if(iconv_result == (size_t)-1) {
      /* !checksrc! disable ERRNOVAR 1 */
      if(errno == ENOMEM)
        return CURLE_OUT_OF_MEMORY;
      else
        return CURLE_URL_MALFORMAT;
    }

    return CURLE_OK;
  }
  else {
    /* !checksrc! disable ERRNOVAR 1 */
    if(errno == ENOMEM)
      return CURLE_OUT_OF_MEMORY;
    else
      return CURLE_FAILED_INIT;
  }
}

static CURLcode mac_idn_to_ascii(const char *in, char **out)
{
  size_t inlen = strlen(in);
  if(inlen < MAX_HOST_LENGTH) {
    char iconv_buffer[MAX_HOST_LENGTH] = { 0 };
    char *iconv_outptr = iconv_buffer;
    size_t iconv_outlen = sizeof(iconv_buffer);
    CURLcode iconv_result = iconv_to_utf8(in, inlen,
                                          &iconv_outptr, &iconv_outlen);
    if(!iconv_result) {
      UErrorCode err = U_ZERO_ERROR;
      UIDNA *idna = uidna_openUTS46(
        UIDNA_CHECK_BIDI | UIDNA_NONTRANSITIONAL_TO_ASCII, &err);
      if(!U_FAILURE(err)) {
        UIDNAInfo info = UIDNA_INFO_INITIALIZER;
        char buffer[MAX_HOST_LENGTH] = { 0 };
        (void)uidna_nameToASCII_UTF8(idna, iconv_buffer, (int)iconv_outlen,
                                     buffer, sizeof(buffer) - 1, &info, &err);
        uidna_close(idna);
        if(!U_FAILURE(err) && !info.errors) {
          *out = curlx_strdup(buffer);
          if(*out)
            return CURLE_OK;
          else
            return CURLE_OUT_OF_MEMORY;
        }
      }
    }
    else
      return iconv_result;
  }
  return CURLE_URL_MALFORMAT;
}

static CURLcode mac_ascii_to_idn(const char *in, char **out)
{
  size_t inlen = strlen(in);
  if(inlen < MAX_HOST_LENGTH) {
    UErrorCode err = U_ZERO_ERROR;
    UIDNA *idna = uidna_openUTS46(
      UIDNA_CHECK_BIDI | UIDNA_NONTRANSITIONAL_TO_UNICODE, &err);
    if(!U_FAILURE(err)) {
      UIDNAInfo info = UIDNA_INFO_INITIALIZER;
      char buffer[MAX_HOST_LENGTH] = { 0 };
      (void)uidna_nameToUnicodeUTF8(idna, in, -1, buffer,
                                    sizeof(buffer) - 1, &info, &err);
      uidna_close(idna);
      if(!U_FAILURE(err)) {
        *out = curlx_strdup(buffer);
        if(*out)
          return CURLE_OK;
        else
          return CURLE_OUT_OF_MEMORY;
      }
    }
  }
  return CURLE_URL_MALFORMAT;
}
#endif

#ifdef USE_WIN32_IDN
/* using Windows kernel32 and normaliz libraries. */

#define IDN_MAX_LENGTH 255

static char *idn_curlx_convert_wchar_to_UTF8(const wchar_t *str_w, int chars)
{
  char *str_utf8 = NULL;
  int bytes = WideCharToMultiByte(CP_UTF8, 0, str_w, chars, NULL, 0,
                                  NULL, NULL);
  if(bytes > 0) {
    str_utf8 = curlx_malloc(bytes);
    if(str_utf8) {
      if(WideCharToMultiByte(CP_UTF8, 0, str_w, chars, str_utf8, bytes,
                             NULL, NULL) == 0) {
        curlx_free(str_utf8);
        return NULL;
      }
    }
  }
  return str_utf8;
}

static CURLcode win32_idn_to_ascii(const char *in, char **out)
{
  wchar_t in_w[IDN_MAX_LENGTH];
  int in_w_len;
  *out = NULL;
  /* Returned in_w_len includes the null-terminator, which then gets
     preserved across the calls that follow, ending up terminating
     the buffer returned to the caller. */
  in_w_len = MultiByteToWideChar(CP_UTF8, 0, in, -1, in_w, IDN_MAX_LENGTH);
  if(in_w_len) {
    wchar_t punycode[IDN_MAX_LENGTH];
    int chars = IdnToAscii(0, in_w, in_w_len, punycode, IDN_MAX_LENGTH);
    if(chars > 0) {
      *out = idn_curlx_convert_wchar_to_UTF8(punycode, chars);
      if(!*out)
        return CURLE_OUT_OF_MEMORY;
    }
    else
      return CURLE_URL_MALFORMAT;
  }
  else
    return CURLE_URL_MALFORMAT;

  return CURLE_OK;
}

static CURLcode win32_ascii_to_idn(const char *in, char **out)
{
  wchar_t in_w[IDN_MAX_LENGTH];
  int in_w_len;
  *out = NULL;
  /* Returned in_w_len includes the null-terminator, which then gets
     preserved across the calls that follow, ending up terminating
     the buffer returned to the caller. */
  in_w_len = MultiByteToWideChar(CP_UTF8, 0, in, -1, in_w, IDN_MAX_LENGTH);
  if(in_w_len) {
    WCHAR idn[IDN_MAX_LENGTH]; /* stores a UTF-16 string */
    int chars = IdnToUnicode(0, in_w, in_w_len, idn, IDN_MAX_LENGTH);
    if(chars > 0) {  /* 'chars' is "the number of characters retrieved" */
      *out = idn_curlx_convert_wchar_to_UTF8(idn, chars);
      if(!*out)
        return CURLE_OUT_OF_MEMORY;
    }
    else
      return CURLE_URL_MALFORMAT;
  }
  else
    return CURLE_URL_MALFORMAT;

  return CURLE_OK;
}

#endif /* USE_WIN32_IDN */

/*
 * Helpers for IDNA conversions.
 */
bool Curl_is_ASCII_name(const char *hostname)
{
  /* get an UNSIGNED local version of the pointer */
  const unsigned char *ch = (const unsigned char *)hostname;

  if(!hostname) /* bad input, consider it ASCII! */
    return TRUE;

  while(*ch) {
    if(*ch++ & 0x80)
      return FALSE;
  }
  return TRUE;
}

#ifdef USE_IDN
/*
 * Curl_idn_decode() returns an allocated IDN decoded string if it was
 * possible. NULL on error.
 *
 * CURLE_URL_MALFORMAT - the hostname could not be converted
 * CURLE_OUT_OF_MEMORY - memory problem
 *
 */
static CURLcode idn_decode(const char *input, char **output)
{
  char *decoded = NULL;
  CURLcode result = CURLE_OK;
#ifdef USE_LIBIDN2
  if(idn2_check_version(IDN2_VERSION)) {
    int flags = IDN2_NFC_INPUT
#if IDN2_VERSION_NUMBER >= 0x00140000
      /* IDN2_NFC_INPUT: Normalize input string using normalization form C.
         IDN2_NONTRANSITIONAL: Perform Unicode TR46 non-transitional
         processing. */
      | IDN2_NONTRANSITIONAL
#endif
      ;
    int rc = IDN2_LOOKUP(input, &decoded, flags);
    if(rc != IDN2_OK)
      /* fallback to TR46 Transitional mode for better IDNA2003
         compatibility */
      rc = IDN2_LOOKUP(input, &decoded, IDN2_TRANSITIONAL);
    if(rc != IDN2_OK)
      result = CURLE_URL_MALFORMAT;
  }
  else
    /* a too old libidn2 version */
    result = CURLE_NOT_BUILT_IN;
#elif defined(USE_WIN32_IDN)
  result = win32_idn_to_ascii(input, &decoded);
#elif defined(USE_APPLE_IDN)
  result = mac_idn_to_ascii(input, &decoded);
#endif
  if(!result)
    *output = decoded;
  return result;
}

static CURLcode idn_encode(const char *puny, char **output)
{
  char *enc = NULL;
#ifdef USE_LIBIDN2
  int rc = idn2_to_unicode_8z8z(puny, &enc, 0);
  if(rc != IDNA_SUCCESS)
    return rc == IDNA_MALLOC_ERROR ? CURLE_OUT_OF_MEMORY : CURLE_URL_MALFORMAT;
#elif defined(USE_WIN32_IDN)
  CURLcode result = win32_ascii_to_idn(puny, &enc);
  if(result)
    return result;
#elif defined(USE_APPLE_IDN)
  CURLcode result = mac_ascii_to_idn(puny, &enc);
  if(result)
    return result;
#endif
  *output = enc;
  return CURLE_OK;
}

CURLcode Curl_idn_decode(const char *input, char **output)
{
  char *d = NULL;
  CURLcode result = idn_decode(input, &d);
#ifdef USE_LIBIDN2
  if(!result) {
    char *c = curlx_strdup(d);
    idn2_free(d);
    if(c)
      d = c;
    else
      result = CURLE_OUT_OF_MEMORY;
  }
#endif
  if(!result) {
    if(!d[0]) { /* ended up zero length, not acceptable */
      result = CURLE_URL_MALFORMAT;
      curlx_free(d);
    }
    else
      *output = d;
  }
  return result;
}

CURLcode Curl_idn_encode(const char *puny, char **output)
{
  char *d = NULL;
  CURLcode result = idn_encode(puny, &d);
#ifdef USE_LIBIDN2
  if(!result) {
    char *c = curlx_strdup(d);
    idn2_free(d);
    if(c)
      d = c;
    else
      result = CURLE_OUT_OF_MEMORY;
  }
#endif
  if(!result)
    *output = d;
  return result;
}

/*
 * Frees data allocated by idnconvert_hostname()
 */
void Curl_free_idnconverted_hostname(struct hostname *host)
{
  Curl_safefree(host->encalloc);
}

#endif /* USE_IDN */

/*
 * Perform any necessary IDN conversion of hostname
 */
CURLcode Curl_idnconvert_hostname(struct hostname *host)
{
  /* set the name we use to display the hostname */
  host->dispname = host->name;

#ifdef USE_IDN
  /* Check name for non-ASCII and convert hostname if we can */
  if(!Curl_is_ASCII_name(host->name)) {
    char *decoded;
    CURLcode result = Curl_idn_decode(host->name, &decoded);
    if(result)
      return result;
    /* successful */
    host->name = host->encalloc = decoded;
  }
#endif
  return CURLE_OK;
}

Coverage Report

Created: 2026-04-29 07:01

Line	Count	Source
1		/***************************************************************************
2		* _ _ ____ _
3		* Project ___\| \| \| \| _ \\| \|
4		* / __\| \| \| \| \|_) \| \|
5		* \| (__\| \|_\| \| _ <\| \|___
6		* \___\|\___/\|_\| \_\_____\|
7		*
8		* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9		*
10		* This software is licensed as described in the file COPYING, which
11		* you should have received as part of this distribution. The terms
12		* are also available at https://curl.se/docs/copyright.html.
13		*
14		* You may opt to use, copy, modify, merge, publish, distribute and/or sell
15		* copies of the Software, and permit persons to whom the Software is
16		* furnished to do so, under the terms of the COPYING file.
17		*
18		* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19		* KIND, either express or implied.
20		*
21		* SPDX-License-Identifier: curl
22		*
23		***************************************************************************/
24		/*
25		* IDN conversions
26		*/
27		#include "curl_setup.h"
28
29		#include "urldata.h"
30		#include "idn.h"
31
32		#ifdef USE_LIBIDN2
33		#include <idn2.h>
34
35		#if defined(_WIN32) && defined(UNICODE)
36		#define IDN2_LOOKUP(name, host, flags) \
37		idn2_lookup_u8((const uint8_t )name, (uint8_t *)host, flags)
38		#else
39		#define IDN2_LOOKUP(name, host, flags) \
40		idn2_lookup_ul((const char )(name), (char *)(host), flags)
41		#endif
42		#endif /* USE_LIBIDN2 */
43
44		/* for macOS and iOS targets */
45		#ifdef USE_APPLE_IDN
46		#include <unicode/uidna.h>
47		#include <iconv.h>
48		#include <langinfo.h>
49
50		#define MAX_HOST_LENGTH 512
51
52		static CURLcode iconv_to_utf8(const char *in, size_t inlen,
53		char *out, size_t outlen)
54		{
55		iconv_t cd = iconv_open("UTF-8", nl_langinfo(CODESET));
56		if(cd != (iconv_t)-1) {
57		size_t iconv_outlen = *outlen;
58		char iconv_in = (char )CURL_UNCONST(in);
59		size_t iconv_inlen = inlen;
60		size_t iconv_result = iconv(cd, &iconv_in, &iconv_inlen,
61		out, &iconv_outlen);
62		*outlen -= iconv_outlen;
63		iconv_close(cd);
64		if(iconv_result == (size_t)-1) {
65		/* !checksrc! disable ERRNOVAR 1 */
66		if(errno == ENOMEM)
67		return CURLE_OUT_OF_MEMORY;
68		else
69		return CURLE_URL_MALFORMAT;
70		}
71
72		return CURLE_OK;
73		}
74		else {
75		/* !checksrc! disable ERRNOVAR 1 */
76		if(errno == ENOMEM)
77		return CURLE_OUT_OF_MEMORY;
78		else
79		return CURLE_FAILED_INIT;
80		}
81		}
82
83		static CURLcode mac_idn_to_ascii(const char in, char *out)
84		{
85		size_t inlen = strlen(in);
86		if(inlen < MAX_HOST_LENGTH) {
87		char iconv_buffer[MAX_HOST_LENGTH] = { 0 };
88		char *iconv_outptr = iconv_buffer;
89		size_t iconv_outlen = sizeof(iconv_buffer);
90		CURLcode iconv_result = iconv_to_utf8(in, inlen,
91		&iconv_outptr, &iconv_outlen);
92		if(!iconv_result) {
93		UErrorCode err = U_ZERO_ERROR;
94		UIDNA *idna = uidna_openUTS46(
95		UIDNA_CHECK_BIDI \| UIDNA_NONTRANSITIONAL_TO_ASCII, &err);
96		if(!U_FAILURE(err)) {
97		UIDNAInfo info = UIDNA_INFO_INITIALIZER;
98		char buffer[MAX_HOST_LENGTH] = { 0 };
99		(void)uidna_nameToASCII_UTF8(idna, iconv_buffer, (int)iconv_outlen,
100		buffer, sizeof(buffer) - 1, &info, &err);
101		uidna_close(idna);
102		if(!U_FAILURE(err) && !info.errors) {
103		*out = curlx_strdup(buffer);
104		if(*out)
105		return CURLE_OK;
106		else
107		return CURLE_OUT_OF_MEMORY;
108		}
109		}
110		}
111		else
112		return iconv_result;
113		}
114		return CURLE_URL_MALFORMAT;
115		}
116
117		static CURLcode mac_ascii_to_idn(const char in, char *out)
118		{
119		size_t inlen = strlen(in);
120		if(inlen < MAX_HOST_LENGTH) {
121		UErrorCode err = U_ZERO_ERROR;
122		UIDNA *idna = uidna_openUTS46(
123		UIDNA_CHECK_BIDI \| UIDNA_NONTRANSITIONAL_TO_UNICODE, &err);
124		if(!U_FAILURE(err)) {
125		UIDNAInfo info = UIDNA_INFO_INITIALIZER;
126		char buffer[MAX_HOST_LENGTH] = { 0 };
127		(void)uidna_nameToUnicodeUTF8(idna, in, -1, buffer,
128		sizeof(buffer) - 1, &info, &err);
129		uidna_close(idna);
130		if(!U_FAILURE(err)) {
131		*out = curlx_strdup(buffer);
132		if(*out)
133		return CURLE_OK;
134		else
135		return CURLE_OUT_OF_MEMORY;
136		}
137		}
138		}
139		return CURLE_URL_MALFORMAT;
140		}
141		#endif
142
143		#ifdef USE_WIN32_IDN
144		/* using Windows kernel32 and normaliz libraries. */
145
146		#define IDN_MAX_LENGTH 255
147
148		static char idn_curlx_convert_wchar_to_UTF8(const wchar_t str_w, int chars)
149		{
150		char *str_utf8 = NULL;
151		int bytes = WideCharToMultiByte(CP_UTF8, 0, str_w, chars, NULL, 0,
152		NULL, NULL);
153		if(bytes > 0) {
154		str_utf8 = curlx_malloc(bytes);
155		if(str_utf8) {
156		if(WideCharToMultiByte(CP_UTF8, 0, str_w, chars, str_utf8, bytes,
157		NULL, NULL) == 0) {
158		curlx_free(str_utf8);
159		return NULL;
160		}
161		}
162		}
163		return str_utf8;
164		}
165
166		static CURLcode win32_idn_to_ascii(const char in, char *out)
167		{
168		wchar_t in_w[IDN_MAX_LENGTH];
169		int in_w_len;
170		*out = NULL;
171		/* Returned in_w_len includes the null-terminator, which then gets
172		preserved across the calls that follow, ending up terminating
173		the buffer returned to the caller. */
174		in_w_len = MultiByteToWideChar(CP_UTF8, 0, in, -1, in_w, IDN_MAX_LENGTH);
175		if(in_w_len) {
176		wchar_t punycode[IDN_MAX_LENGTH];
177		int chars = IdnToAscii(0, in_w, in_w_len, punycode, IDN_MAX_LENGTH);
178		if(chars > 0) {
179		*out = idn_curlx_convert_wchar_to_UTF8(punycode, chars);
180		if(!*out)
181		return CURLE_OUT_OF_MEMORY;
182		}
183		else
184		return CURLE_URL_MALFORMAT;
185		}
186		else
187		return CURLE_URL_MALFORMAT;
188
189		return CURLE_OK;
190		}
191
192		static CURLcode win32_ascii_to_idn(const char in, char *out)
193		{
194		wchar_t in_w[IDN_MAX_LENGTH];
195		int in_w_len;
196		*out = NULL;
197		/* Returned in_w_len includes the null-terminator, which then gets
198		preserved across the calls that follow, ending up terminating
199		the buffer returned to the caller. */
200		in_w_len = MultiByteToWideChar(CP_UTF8, 0, in, -1, in_w, IDN_MAX_LENGTH);
201		if(in_w_len) {
202		WCHAR idn[IDN_MAX_LENGTH]; /* stores a UTF-16 string */
203		int chars = IdnToUnicode(0, in_w, in_w_len, idn, IDN_MAX_LENGTH);
204		if(chars > 0) { /* 'chars' is "the number of characters retrieved" */
205		*out = idn_curlx_convert_wchar_to_UTF8(idn, chars);
206		if(!*out)
207		return CURLE_OUT_OF_MEMORY;
208		}
209		else
210		return CURLE_URL_MALFORMAT;
211		}
212		else
213		return CURLE_URL_MALFORMAT;
214
215		return CURLE_OK;
216		}
217
218		#endif /* USE_WIN32_IDN */
219
220		/*
221		* Helpers for IDNA conversions.
222		*/
223		bool Curl_is_ASCII_name(const char *hostname)
224	0	{
225		/* get an UNSIGNED local version of the pointer */
226	0	const unsigned char ch = (const unsigned char )hostname;
227
228	0	if(!hostname) /* bad input, consider it ASCII! */
229	0	return TRUE;
230
231	0	while(*ch) {
232	0	if(*ch++ & 0x80)
233	0	return FALSE;
234	0	}
235	0	return TRUE;
236	0	}
237
238		#ifdef USE_IDN
239		/*
240		* Curl_idn_decode() returns an allocated IDN decoded string if it was
241		* possible. NULL on error.
242		*
243		* CURLE_URL_MALFORMAT - the hostname could not be converted
244		* CURLE_OUT_OF_MEMORY - memory problem
245		*
246		*/
247		static CURLcode idn_decode(const char input, char *output)
248		{
249		char *decoded = NULL;
250		CURLcode result = CURLE_OK;
251		#ifdef USE_LIBIDN2
252		if(idn2_check_version(IDN2_VERSION)) {
253		int flags = IDN2_NFC_INPUT
254		#if IDN2_VERSION_NUMBER >= 0x00140000
255		/* IDN2_NFC_INPUT: Normalize input string using normalization form C.
256		IDN2_NONTRANSITIONAL: Perform Unicode TR46 non-transitional
257		processing. */
258		\| IDN2_NONTRANSITIONAL
259		#endif
260		;
261		int rc = IDN2_LOOKUP(input, &decoded, flags);
262		if(rc != IDN2_OK)
263		/* fallback to TR46 Transitional mode for better IDNA2003
264		compatibility */
265		rc = IDN2_LOOKUP(input, &decoded, IDN2_TRANSITIONAL);
266		if(rc != IDN2_OK)
267		result = CURLE_URL_MALFORMAT;
268		}
269		else
270		/* a too old libidn2 version */
271		result = CURLE_NOT_BUILT_IN;
272		#elif defined(USE_WIN32_IDN)
273		result = win32_idn_to_ascii(input, &decoded);
274		#elif defined(USE_APPLE_IDN)
275		result = mac_idn_to_ascii(input, &decoded);
276		#endif
277		if(!result)
278		*output = decoded;
279		return result;
280		}
281
282		static CURLcode idn_encode(const char puny, char *output)
283		{
284		char *enc = NULL;
285		#ifdef USE_LIBIDN2
286		int rc = idn2_to_unicode_8z8z(puny, &enc, 0);
287		if(rc != IDNA_SUCCESS)
288		return rc == IDNA_MALLOC_ERROR ? CURLE_OUT_OF_MEMORY : CURLE_URL_MALFORMAT;
289		#elif defined(USE_WIN32_IDN)
290		CURLcode result = win32_ascii_to_idn(puny, &enc);
291		if(result)
292		return result;
293		#elif defined(USE_APPLE_IDN)
294		CURLcode result = mac_ascii_to_idn(puny, &enc);
295		if(result)
296		return result;
297		#endif
298		*output = enc;
299		return CURLE_OK;
300		}
301
302		CURLcode Curl_idn_decode(const char input, char *output)
303		{
304		char *d = NULL;
305		CURLcode result = idn_decode(input, &d);
306		#ifdef USE_LIBIDN2
307		if(!result) {
308		char *c = curlx_strdup(d);
309		idn2_free(d);
310		if(c)
311		d = c;
312		else
313		result = CURLE_OUT_OF_MEMORY;
314		}
315		#endif
316		if(!result) {
317		if(!d[0]) { /* ended up zero length, not acceptable */
318		result = CURLE_URL_MALFORMAT;
319		curlx_free(d);
320		}
321		else
322		*output = d;
323		}
324		return result;
325		}
326
327		CURLcode Curl_idn_encode(const char puny, char *output)
328		{
329		char *d = NULL;
330		CURLcode result = idn_encode(puny, &d);
331		#ifdef USE_LIBIDN2
332		if(!result) {
333		char *c = curlx_strdup(d);
334		idn2_free(d);
335		if(c)
336		d = c;
337		else
338		result = CURLE_OUT_OF_MEMORY;
339		}
340		#endif
341		if(!result)
342		*output = d;
343		return result;
344		}
345
346		/*
347		* Frees data allocated by idnconvert_hostname()
348		*/
349		void Curl_free_idnconverted_hostname(struct hostname *host)
350		{
351		Curl_safefree(host->encalloc);
352		}
353
354		#endif /* USE_IDN */
355
356		/*
357		* Perform any necessary IDN conversion of hostname
358		*/
359		CURLcode Curl_idnconvert_hostname(struct hostname *host)
360	0	{
361		/* set the name we use to display the hostname */
362	0	host->dispname = host->name;
363
364		#ifdef USE_IDN
365		/* Check name for non-ASCII and convert hostname if we can */
366		if(!Curl_is_ASCII_name(host->name)) {
367		char *decoded;
368		CURLcode result = Curl_idn_decode(host->name, &decoded);
369		if(result)
370		return result;
371		/* successful */
372		host->name = host->encalloc = decoded;
373		}
374		#endif
375	0	return CURLE_OK;
376	0	}