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73 lines
2.0 KiB
73 lines
2.0 KiB
/*
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* Copyright (C) 2023 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 "./string-utils.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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namespace shell_as {
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bool StringToUInt32(const char* s, uint32_t* i) {
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uint64_t value = 0;
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if (!StringToUInt64(s, &value)) {
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return false;
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}
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if (value > UINT_MAX) {
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return false;
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}
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*i = value;
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return true;
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}
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bool StringToUInt64(const char* s, uint64_t* i) {
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char* endptr = nullptr;
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// Reset errno to a non-error value since strtoul does not clear errno.
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errno = 0;
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*i = strtoul(s, &endptr, 10);
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// strtoul will return 0 if the value cannot be parsed as an unsigned long. If
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// this occurs, ensure that the ID actually was zero. This is done by ensuring
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// that the end pointer was advanced and that it now points to the end of the
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// string (a null byte).
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return errno == 0 && (*i != 0 || (endptr != s && *endptr == '\0'));
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}
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bool SplitIdsAndSkip(char* line, const char* separators, int num_to_skip,
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std::vector<uid_t>* ids) {
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if (line == nullptr) {
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return false;
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}
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ids->clear();
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for (char* id_string = strtok(line, separators); id_string != nullptr;
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id_string = strtok(nullptr, separators)) {
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if (num_to_skip > 0) {
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num_to_skip--;
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continue;
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}
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gid_t id;
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if (!StringToUInt32(id_string, &id)) {
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return false;
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}
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ids->push_back(id);
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}
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return true;
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}
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} // namespace shell_as
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