145 lines
4.4 KiB
C++
145 lines
4.4 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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#define LOG_TAG "properties"
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// #define LOG_NDEBUG 0
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdbool.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 <cutils/properties.h>
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#include <cutils/sockets.h>
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#include <log/log.h>
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int8_t property_get_bool(const char *key, int8_t default_value) {
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if (!key) {
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return default_value;
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}
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int8_t result = default_value;
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char buf[PROPERTY_VALUE_MAX] = {'\0'};
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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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// Convert string property to int (default if fails); return default value if out of bounds
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static intmax_t property_get_imax(const char *key, intmax_t lower_bound, intmax_t upper_bound,
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intmax_t default_value) {
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if (!key) {
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return default_value;
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}
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intmax_t result = default_value;
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char buf[PROPERTY_VALUE_MAX] = {'\0'};
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char *end = NULL;
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int len = property_get(key, buf, "");
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if (len > 0) {
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int tmp = errno;
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errno = 0;
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// Infer base automatically
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result = strtoimax(buf, &end, /*base*/ 0);
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if ((result == INTMAX_MIN || result == INTMAX_MAX) && errno == ERANGE) {
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// Over or underflow
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result = default_value;
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ALOGV("%s(%s,%" PRIdMAX ") - overflow", __FUNCTION__, key, default_value);
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} else if (result < lower_bound || result > upper_bound) {
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// Out of range of requested bounds
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result = default_value;
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ALOGV("%s(%s,%" PRIdMAX ") - out of range", __FUNCTION__, key, default_value);
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} else if (end == buf) {
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// Numeric conversion failed
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result = default_value;
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ALOGV("%s(%s,%" PRIdMAX ") - numeric conversion failed", __FUNCTION__, key,
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default_value);
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}
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errno = tmp;
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}
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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 (int64_t)property_get_imax(key, INT64_MIN, INT64_MAX, 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 (int32_t)property_get_imax(key, INT32_MIN, INT32_MAX, default_value);
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}
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#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#include <sys/_system_properties.h>
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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 > 0) {
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return len;
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}
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if (default_value) {
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len = strnlen(default_value, PROPERTY_VALUE_MAX - 1);
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memcpy(value, default_value, len);
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value[len] = '\0';
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}
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return len;
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}
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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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