idn: remove Curl_win32_ascii_to_idn

It was not used. Introduce a new IDN header for the prototype(s).

Closes #10094

3 files changed, 34 insertions, 32 deletions

diff --git a/lib/idn_win32.c b/lib/idn_win32.c
index 4ebb6b773..b3088be6a 100644
--- a/lib/idn_win32.c
+++ b/lib/idn_win32.c
@@ -29,7 +29,7 @@
 #include "curl_setup.h"
 
 #ifdef USE_WIN32_IDN
-
+#include "idn_win32.h"
 #include "curl_multibyte.h"
 #include "curl_memory.h"
 #include "warnless.h"
@@ -52,9 +52,6 @@ WINBASEAPI int WINAPI IdnToUnicode(DWORD dwFlags,
 
 #define IDN_MAX_LENGTH 255
 
-bool Curl_win32_idn_to_ascii(const char *in, char **out);
-bool Curl_win32_ascii_to_idn(const char *in, char **out);
-
 bool Curl_win32_idn_to_ascii(const char *in, char **out)
 {
   bool success = FALSE;
@@ -78,29 +75,4 @@ bool Curl_win32_idn_to_ascii(const char *in, char **out)
   return success;
 }
 
-bool Curl_win32_ascii_to_idn(const char *in, char **out)
-{
-  bool success = FALSE;
-
-  wchar_t *in_w = curlx_convert_UTF8_to_wchar(in);
-  if(in_w) {
-    size_t in_len = wcslen(in_w) + 1;
-    wchar_t unicode[IDN_MAX_LENGTH];
-    int chars = IdnToUnicode(0, in_w, curlx_uztosi(in_len),
-                             unicode, IDN_MAX_LENGTH);
-    curlx_unicodefree(in_w);
-    if(chars) {
-      char *mstr = curlx_convert_wchar_to_UTF8(unicode);
-      if(mstr) {
-        *out = strdup(mstr);
-        curlx_unicodefree(mstr);
-        if(*out)
-          success = TRUE;
-      }
-    }
-  }
-
-  return success;
-}
-
 #endif /* USE_WIN32_IDN */
diff --git a/lib/idn_win32.h b/lib/idn_win32.h
new file mode 100644
index 000000000..8a7640336
--- /dev/null
+++ b/lib/idn_win32.h
@@ -0,0 +1,32 @@
+#ifndef HEADER_CURL_IDN_WIN32_H
+#define HEADER_CURL_IDN_WIN32_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2022, 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
+ *
+ ***************************************************************************/
+
+#ifdef USE_WIN32_IDN
+
+bool Curl_win32_idn_to_ascii(const char *in, char **out);
+
+#endif /* USE_WIN32_IDN */
+#endif /* HEADER_CURL_IDN_WIN32_H */
diff --git a/lib/url.c b/lib/url.c
index 0af812bcd..4f88fa984 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -71,10 +71,8 @@
 #define IDN2_LOOKUP(name, host, flags) \
   idn2_lookup_ul((const char *)name, (char **)host, flags)
 #endif
-
 #elif defined(USE_WIN32_IDN)
-/* prototype for Curl_win32_idn_to_ascii() */
-bool Curl_win32_idn_to_ascii(const char *in, char **out);
+#include "idn.h"
 #endif  /* USE_LIBIDN2 */
 
 #include "doh.h"