f6c25d6fd3
Move the "is there a comparator?" check into the sole caller, to match the "is there a filter?" check. Remove the unnecessary (and unlikely) pre-sort "is the array empty?" check. Test: treehugger Change-Id: I8bd461380420dce4a8bc05ef5fe3511b26347d7c
135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
/*
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* Copyright (C) 2013 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 <dirent.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.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 "platform/bionic/macros.h"
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#include "private/ScopedReaddir.h"
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// A smart pointer to the scandir dirent**.
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class ScandirResult {
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public:
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ScandirResult() : names_(nullptr), size_(0), capacity_(0) {
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}
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~ScandirResult() {
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// We always call release(), so this can't happen.
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if (names_ != nullptr) __assert(__FILE__, __LINE__, "missing call to release()");
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}
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size_t size() {
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return size_;
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}
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dirent** release() {
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dirent** result = names_;
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names_ = nullptr;
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size_ = capacity_ = 0;
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return result;
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}
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bool Add(dirent* entry) {
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if (size_ >= capacity_) {
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size_t new_capacity = capacity_ + 32;
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dirent** new_names =
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reinterpret_cast<dirent**>(realloc(names_, new_capacity * sizeof(dirent*)));
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if (new_names == nullptr) {
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return false;
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}
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names_ = new_names;
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capacity_ = new_capacity;
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}
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dirent* copy = CopyDirent(entry);
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if (copy == nullptr) {
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return false;
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}
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names_[size_++] = copy;
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return true;
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}
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void Sort(int (*comparator)(const dirent**, const dirent**)) {
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qsort(names_, size_, sizeof(dirent*),
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reinterpret_cast<int (*)(const void*, const void*)>(comparator));
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}
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private:
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dirent** names_;
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size_t size_;
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size_t capacity_;
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static dirent* CopyDirent(dirent* original) {
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// Allocate the minimum number of bytes necessary, rounded up to a 4-byte boundary.
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size_t size = ((original->d_reclen + 3) & ~3);
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dirent* copy = reinterpret_cast<dirent*>(malloc(size));
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memcpy(copy, original, original->d_reclen);
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return copy;
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}
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BIONIC_DISALLOW_COPY_AND_ASSIGN(ScandirResult);
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};
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int scandirat(int parent_fd, const char* dir_name, dirent*** name_list,
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int (*filter)(const dirent*),
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int (*comparator)(const dirent**, const dirent**)) {
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DIR* dir = nullptr;
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if (parent_fd == AT_FDCWD) {
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dir = opendir(dir_name);
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} else {
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int dir_fd = openat(parent_fd, dir_name, O_CLOEXEC | O_DIRECTORY | O_RDONLY);
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if (dir_fd != -1) {
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dir = fdopendir(dir_fd);
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}
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}
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ScopedReaddir reader(dir);
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if (reader.IsBad()) {
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return -1;
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}
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ScandirResult names;
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dirent* entry;
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while ((entry = reader.ReadEntry()) != nullptr) {
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// If we have a filter, skip names that don't match.
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if (filter != nullptr && !(*filter)(entry)) {
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continue;
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}
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names.Add(entry);
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}
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if (comparator != nullptr) {
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names.Sort(comparator);
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}
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size_t size = names.size();
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*name_list = names.release();
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return size;
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}
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__strong_alias(scandirat64, scandirat);
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int scandir(const char* dir_path, dirent*** name_list,
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int (*filter)(const dirent*),
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int (*comparator)(const dirent**, const dirent**)) {
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return scandirat(AT_FDCWD, dir_path, name_list, filter, comparator);
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}
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__strong_alias(scandir64, scandir);
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