| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include "private/icu.h" |
| |
| #include <dirent.h> |
| #include <dlfcn.h> |
| #include <pthread.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <async_safe/log.h> |
| |
| // Allowed icu4c version numbers are in the range [44, 999]. |
| // Gingerbread's icu4c 4.4 is the minimum supported ICU version. |
| static constexpr auto ICUDATA_VERSION_MIN_LENGTH = 2; |
| static constexpr auto ICUDATA_VERSION_MAX_LENGTH = 3; |
| static constexpr auto ICUDATA_VERSION_MIN = 44; |
| |
| static char g_icudata_version[ICUDATA_VERSION_MAX_LENGTH + 1]; |
| |
| static void* g_libicuuc_handle = nullptr; |
| |
| static int __icu_dat_file_filter(const dirent* dirp) { |
| const char* name = dirp->d_name; |
| |
| // Is the name the right length to match 'icudt(\d\d\d)l.dat'? |
| const size_t len = strlen(name); |
| if (len < 10 + ICUDATA_VERSION_MIN_LENGTH || len > 10 + ICUDATA_VERSION_MAX_LENGTH) return 0; |
| |
| return !strncmp(name, "icudt", 5) && !strncmp(&name[len - 5], "l.dat", 5); |
| } |
| |
| static bool __find_icu() { |
| dirent** namelist = nullptr; |
| int n = scandir("/system/usr/icu", &namelist, &__icu_dat_file_filter, alphasort); |
| int max_version = -1; |
| while (n--) { |
| // We prefer the latest version available. |
| int version = atoi(&namelist[n]->d_name[strlen("icudt")]); |
| if (version != 0 && version > max_version) max_version = version; |
| free(namelist[n]); |
| } |
| free(namelist); |
| |
| if (max_version < ICUDATA_VERSION_MIN) { |
| async_safe_write_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't find an ICU .dat file"); |
| return false; |
| } |
| |
| snprintf(g_icudata_version, sizeof(g_icudata_version), "_%d", max_version); |
| |
| g_libicuuc_handle = dlopen("libicuuc.so", RTLD_LOCAL); |
| if (g_libicuuc_handle == nullptr) { |
| async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't open libicuuc.so: %s", |
| dlerror()); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void* __find_icu_symbol(const char* symbol_name) { |
| static bool found_icu = __find_icu(); |
| if (!found_icu) return nullptr; |
| |
| char versioned_symbol_name[strlen(symbol_name) + sizeof(g_icudata_version)]; |
| snprintf(versioned_symbol_name, sizeof(versioned_symbol_name), "%s%s", |
| symbol_name, g_icudata_version); |
| |
| void* symbol = dlsym(g_libicuuc_handle, versioned_symbol_name); |
| if (symbol == nullptr) { |
| async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't find %s", |
| versioned_symbol_name); |
| } |
| return symbol; |
| } |