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/*
* Copyright (C) 2021 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 "sysprop_helpers.h"
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "sys/system_properties.h"
static bool get_property_value(const char* property_name, char* dest, size_t dest_size) {
assert(property_name && dest && dest_size != 0);
const prop_info* prop = __system_property_find(property_name);
if (!prop) return false;
struct PropCbCookie {
char* dest;
size_t size;
};
*dest = '\0';
PropCbCookie cb_cookie = {dest, dest_size};
__system_property_read_callback(
prop,
[](void* cookie, const char* /* name */, const char* value, uint32_t /* serial */) {
auto* cb_cookie = reinterpret_cast<PropCbCookie*>(cookie);
strncpy(cb_cookie->dest, value, cb_cookie->size);
},
&cb_cookie);
if (*dest != '\0' && *dest != '0') return true;
return false;
}
bool get_config_from_env_or_sysprops(const char* env_var_name, const char* const* sys_prop_names,
size_t sys_prop_names_size, char* options,
size_t options_size) {
const char* env = getenv(env_var_name);
if (env && *env != '\0') {
strncpy(options, env, options_size);
options[options_size - 1] = '\0'; // Ensure null-termination.
return true;
}
for (size_t i = 0; i < sys_prop_names_size; ++i) {
if (sys_prop_names[i] == nullptr) continue;
if (get_property_value(sys_prop_names[i], options, options_size)) return true;
}
return false;
}
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