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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "private/icu.h"
     30 
     31 #include <dirent.h>
     32 #include <dlfcn.h>
     33 #include <pthread.h>
     34 #include <stdlib.h>
     35 #include <string.h>
     36 
     37 #include <async_safe/log.h>
     38 
     39 static void* g_libicuuc_handle = nullptr;
     40 
     41 static bool __find_icu() {
     42   g_libicuuc_handle = dlopen("libandroidicu.so", RTLD_LOCAL);
     43   if (g_libicuuc_handle == nullptr) {
     44     async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't open libandroidicu.so: %s",
     45                           dlerror());
     46     return false;
     47   }
     48 
     49   return true;
     50 }
     51 
     52 void* __find_icu_symbol(const char* symbol_name) {
     53   static bool found_icu = __find_icu();
     54   if (!found_icu) return nullptr;
     55 
     56   char versioned_symbol_name[strlen(symbol_name) + strlen("_android") + 1];
     57   snprintf(versioned_symbol_name, sizeof(versioned_symbol_name), "%s_android",
     58            symbol_name);
     59 
     60   void* symbol = dlsym(g_libicuuc_handle, versioned_symbol_name);
     61   if (symbol == nullptr) {
     62     async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't find %s",
     63                           versioned_symbol_name);
     64   }
     65   return symbol;
     66 }
     67