93 lines
1.5 KiB
C++
93 lines
1.5 KiB
C++
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#include <dirent.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 <sys/syscall.h>
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#include <unistd.h>
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#include <kernel/API/DirectoryEntry.h>
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struct __DIR
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{
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int fd { -1 };
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size_t entry_index { 0 };
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Kernel::API::DirectoryEntry* current { nullptr };
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size_t buffer_size { 0 };
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Kernel::API::DirectoryEntryList buffer[];
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};
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int closedir(DIR* dirp)
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{
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if (dirp == nullptr || dirp->fd == -1)
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{
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errno = EBADF;
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return -1;
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}
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close(dirp->fd);
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dirp->fd = -1;
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free(dirp);
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return 0;
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}
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int dirfd(DIR* dirp)
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{
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if (dirp == nullptr || dirp->fd == -1)
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{
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errno = EINVAL;
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return -1;
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}
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return dirp->fd;
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}
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DIR* fdopendir(int fd)
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{
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DIR* dirp = (DIR*)malloc(sizeof(DIR) + 4096);
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if (dirp == nullptr)
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return nullptr;
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dirp->fd = fd;
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dirp->current = nullptr;
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dirp->buffer_size = 4096;
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return dirp;
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}
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DIR* opendir(const char* dirname)
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{
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int fd = open(dirname, O_SEARCH);
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if (fd == -1)
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return nullptr;
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return fdopendir(fd);
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}
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struct dirent* readdir(DIR* dirp)
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{
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if (dirp == nullptr || dirp->fd == -1)
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{
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errno = EBADF;
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return nullptr;
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}
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dirp->entry_index++;
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if (dirp->current && dirp->entry_index < dirp->buffer->entry_count)
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{
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dirp->current = dirp->current->next();
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return &dirp->current->dirent;
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}
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if (syscall(SYS_READ_DIR_ENTRIES, dirp->fd, dirp->buffer, dirp->buffer_size) == -1)
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return nullptr;
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if (dirp->buffer->entry_count == 0)
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return nullptr;
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dirp->entry_index = 0;
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dirp->current = dirp->buffer->array;
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return &dirp->current->dirent;
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}
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