Simon Josefsson added a idn_free() function in libidn 0.4.5 as a reaction to

Gisle's previous mail. We now use this function, and thus we require libidn
 0.4.5 or later. No earler version will do.

CHANGES

@@ -7,6 +7,10 @@
                                   Changelog
 
 Daniel (24 May 2004)
+- Simon Josefsson added a idn_free() function in libidn 0.4.5 as a reaction to
+  Gisle's previous mail. We now use this function, and thus we require libidn
+  0.4.5 or later. No earler version will do.
+
 - Robert D. Young reported that CURLOPT_COOKIEFILE and CURLOPT_COOKIE could
   not be used both in one request. Fixed it and added test case 172 to verify.
 

lib/setup.h

@@ -304,6 +304,7 @@ typedef struct in_addr Curl_ipconnect;
 /* This could benefit from additional checks that some of the used/important
    header files are present as well before we define the USE_* define. */
 #define USE_LIBIDN
+#define LIBIDN_REQUIRED_VERSION "0.4.5"
 #endif
 
 #endif /* __CONFIG_H */

lib/url.c

@@ -87,6 +87,8 @@
 #ifdef USE_LIBIDN
 #include <idna.h>
 #include <stringprep.h>
+void idn_free (void *ptr); /* prototype from idn-free.h, not provided by
+                              libidn 0.4.5's make install! */
 #endif
 
 #ifdef HAVE_OPENSSL_ENGINE_H
@@ -1390,13 +1392,13 @@ CURLcode Curl_disconnect(struct connectdata *conn)
   Curl_safefree(conn->host.rawalloc); /* host name buffer */
   Curl_safefree(conn->proxy.rawalloc); /* proxy name buffer */
   if(conn->host.encalloc)
-    (free)(conn->host.encalloc); /* encoded host name buffer, must be freed
-                                    with free() since this was allocated by
-                                    libidn */
+    idn_free(conn->host.encalloc); /* encoded host name buffer, must be freed
+                                      with idn_free() since this was allocated
+                                      by libidn */
   if(conn->proxy.encalloc)
-    (free)(conn->proxy.encalloc); /* encoded proxy name buffer, must be freed
-                                     with free() since this was allocated by
-                                     libidn */
+    idn_free(conn->proxy.encalloc); /* encoded proxy name buffer, must be
+                                       freed with idn_free() since this was
+                                       allocated by libidn */
   Curl_SSL_Close(conn);
 
   /* close possibly still open sockets */
@@ -1997,7 +1999,8 @@ static void fix_hostname(struct connectdata *conn, struct hostname *host)
   /*************************************************************
    * Check name for non-ASCII and convert hostname to ACE form.
    *************************************************************/
-  if (!is_ASCII_name(host->name)) {
+  if (!is_ASCII_name(host->name) &&
+      stringprep_check_version(LIBIDN_REQUIRED_VERSION)) {
     char *ace_hostname = NULL;
     struct SessionHandle *data = conn->data;
     int rc = idna_to_ascii_lz(host->name, &ace_hostname, 0);

lib/version.c

@@ -132,8 +132,10 @@ char *curl_version(void)
   ptr += strlen(ptr);
 #endif
 #ifdef USE_LIBIDN
+  if(stringprep_check_version(LIBIDN_REQUIRED_VERSION)) {
     sprintf(ptr, " libidn/%s", stringprep_check_version(NULL));
     ptr += strlen(ptr);
+  }
 #endif
 
   return version;
@@ -208,9 +210,6 @@ static curl_version_info_data version_info = {
 #endif
 #if defined(ENABLE_64BIT) && (SIZEOF_CURL_OFF_T > 4)
   | CURL_VERSION_LARGEFILE
-#endif
-#ifdef USE_LIBIDN
-  | CURL_VERSION_IDN
 #endif
   ,
   NULL, /* ssl_version */
@@ -244,6 +243,13 @@ curl_version_info_data *curl_version_info(CURLversion stamp)
     version_info.ares = ares_version(&aresnum);
     version_info.ares_num = aresnum;
   }
+#endif
+#ifdef USE_LIBIDN
+  /* This returns a version string if we use the given version or later,
+     otherwise it returns NULL */
+  version_info.libidn = stringprep_check_version(LIBIDN_REQUIRED_VERSION);
+  if(version_info.libidn)
+    version_info.features |= CURL_VERSION_IDN;
 #endif
   (void)stamp; /* avoid compiler warnings, we don't use this */