100b08a848
This makes the system property functions available on the host too, and ensures a consistent view of system properties between libcutils and libbase, if you have code running on the host that uses both. Bug: http://b/151789258 Test: treehugger Change-Id: Ie524a77d0c392d7b23e9d12becbb1bf53c81eac6
118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cutils/properties.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <android-base/properties.h>
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int8_t property_get_bool(const char* key, int8_t default_value) {
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if (!key) return default_value;
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int8_t result = default_value;
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char buf[PROPERTY_VALUE_MAX] = {};
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int len = property_get(key, buf, "");
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if (len == 1) {
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char ch = buf[0];
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if (ch == '0' || ch == 'n') {
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result = false;
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} else if (ch == '1' || ch == 'y') {
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result = true;
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}
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} else if (len > 1) {
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if (!strcmp(buf, "no") || !strcmp(buf, "false") || !strcmp(buf, "off")) {
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result = false;
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} else if (!strcmp(buf, "yes") || !strcmp(buf, "true") || !strcmp(buf, "on")) {
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result = true;
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}
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}
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return result;
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}
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template <typename T>
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static T property_get_int(const char* key, T default_value) {
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if (!key) return default_value;
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char value[PROPERTY_VALUE_MAX] = {};
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if (property_get(key, value, "") < 1) return default_value;
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// libcutils unwisely allows octal, which libbase doesn't.
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T result = default_value;
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int saved_errno = errno;
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errno = 0;
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char* end = nullptr;
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intmax_t v = strtoimax(value, &end, 0);
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if (errno != ERANGE && end != value && v >= std::numeric_limits<T>::min() &&
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v <= std::numeric_limits<T>::max()) {
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result = v;
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}
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errno = saved_errno;
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return result;
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}
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int64_t property_get_int64(const char* key, int64_t default_value) {
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return property_get_int<int64_t>(key, default_value);
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}
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int32_t property_get_int32(const char* key, int32_t default_value) {
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return property_get_int<int32_t>(key, default_value);
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}
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int property_set(const char* key, const char* value) {
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return __system_property_set(key, value);
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}
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int property_get(const char* key, char* value, const char* default_value) {
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int len = __system_property_get(key, value);
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if (len < 1 && default_value) {
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snprintf(value, PROPERTY_VALUE_MAX, "%s", default_value);
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return strlen(value);
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}
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return len;
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}
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#if __has_include(<sys/system_properties.h>)
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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struct callback_data {
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void (*callback)(const char* name, const char* value, void* cookie);
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void* cookie;
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};
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static void trampoline(void* raw_data, const char* name, const char* value, unsigned /*serial*/) {
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callback_data* data = reinterpret_cast<callback_data*>(raw_data);
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data->callback(name, value, data->cookie);
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}
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static void property_list_callback(const prop_info* pi, void* data) {
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__system_property_read_callback(pi, trampoline, data);
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}
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int property_list(void (*fn)(const char* name, const char* value, void* cookie), void* cookie) {
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callback_data data = {fn, cookie};
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return __system_property_foreach(property_list_callback, &data);
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}
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#endif
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