Revert "Remove internal gethostbyname_r implementation." - OSX needs it

This reverts commit af19d9f5.

sal/osl/unx/system.c

@@ -32,6 +32,100 @@
 
 static pthread_mutex_t getrtl_mutex = PTHREAD_MUTEX_INITIALIZER;
 
+/* struct passwd differs on some platforms */
+#if !defined(FREEBSD) || (__FreeBSD_version < 601103)
+
+extern int h_errno;
+
+struct hostent *gethostbyname_r(const char *name, struct hostent *result,
+                                char *buffer, int buflen, int *h_errnop)
+{
+    /* buffer layout:   name\0
+     *                  array_of_pointer_to_aliases
+     *                  NULL
+     *                  alias1\0...aliasn\0
+     *                  array_of_pointer_to_addresses
+     *                  NULL
+     *                  addr1addr2addr3...addrn
+     */
+      struct hostent* res;
+
+      pthread_mutex_lock(&getrtl_mutex);
+
+      if ( (res = gethostbyname(name)) )
+      {
+        int nname, naliases, naddr_list, naliasesdata, n;
+        char **p, **parray, *data;
+
+        /* Check buffer size before copying, we want to leave the
+         * buffers unmodified in case something goes wrong.
+         *
+         * Is this required?
+         */
+
+        nname= strlen(res->h_name)+1;
+
+        naliases = naddr_list = naliasesdata = 0;
+
+        for ( p = res->h_aliases; *p != NULL; p++) {
+            naliases++;
+            naliasesdata += strlen(*p)+1;
+        }
+
+        for ( p = res->h_addr_list; *p != NULL; p++)
+            naddr_list++;
+
+        if ( nname
+             + (naliases+1)*sizeof(char*) + naliasesdata
+             + (naddr_list+1)*sizeof(char*) + naddr_list*res->h_length
+             <= buflen )
+        {
+            memcpy(result, res, sizeof(struct hostent));
+
+            strcpy(buffer, res->h_name);
+              result->h_name = buffer;
+            buffer += nname;
+
+            parray = (char**)buffer;
+            result->h_aliases = parray;
+            data = buffer + (naliases+1)*sizeof(char*);
+            for ( p = res->h_aliases; *p != NULL; p++) {
+                n = strlen(*p)+1;
+                *parray++ = data;
+                memcpy(data, *p, n);
+                data += n;
+            }
+            *parray = NULL;
+            buffer = data;
+            parray = (char**)buffer;
+            result->h_addr_list = parray;
+            data = buffer + (naddr_list+1)*sizeof(char*);
+            for ( p = res->h_addr_list; *p != NULL; p++) {
+                *parray++ = data;
+                memcpy(data, *p, res->h_length);
+                data += res->h_length;
+            }
+            *parray = NULL;
+
+               res = result;
+        }
+        else
+        {
+            errno = ERANGE;
+            res = NULL;
+        }
+    }
+    else
+    {
+        *h_errnop = h_errno;
+    }
+
+    pthread_mutex_unlock(&getrtl_mutex);
+
+      return res;
+}
+#endif /* !defined(FREEBSD) || (__FreeBSD_version < 601103) */
+
 #if defined(MACOSX)
 /*
  * Add support for resolving Mac native alias files (not the same as unix alias files)

sal/osl/unx/system.h

@@ -504,6 +504,10 @@ extern struct spwd *getspnam_r(const char *name, struct spwd *result,
 struct tm *localtime_r(const time_t *timep, struct tm *buffer);
 struct tm *gmtime_r(const time_t *timep, struct tm *buffer);
 #endif /* !defined FREEBSD || (__FreeBSD_version < 500112) */
+#if !defined(FREEBSD) || (__FreeBSD_version < 601103)
+struct hostent *gethostbyname_r(const char *name, struct hostent *result,
+                                char *buffer, int buflen, int *h_errnop);
+#endif /* !defined(FREEBSD) || (__FreeBSD_version < 601103) */
 #endif
 
 #endif /* __OSL_SYSTEM_H__ */