mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
![Andreas Kling](/assets/img/avatar_default.png)
Old: Syscall::invoke(Syscall::SC_foo, (dword)arg1, (dword)arg2) New: syscall(SC_foo, arg1, arg2)
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <Kernel/Syscall.h>
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extern "C" {
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DIR* opendir(const char* name)
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{
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int fd = open(name, O_RDONLY | O_DIRECTORY);
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if (fd == -1)
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return nullptr;
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DIR* dirp = (DIR*)malloc(sizeof(DIR));
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dirp->fd = fd;
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dirp->buffer = nullptr;
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dirp->buffer_size = 0;
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dirp->nextptr = nullptr;
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return dirp;
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}
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int closedir(DIR* dirp)
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{
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if (!dirp || dirp->fd == -1)
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return -EBADF;
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int rc = close(dirp->fd);
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if (rc == 0)
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dirp->fd = -1;
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return rc;
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}
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struct sys_dirent {
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ino_t ino;
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byte file_type;
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size_t namelen;
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char name[];
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size_t total_size()
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{
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return sizeof(ino_t) + sizeof(byte) + sizeof(size_t) + sizeof(char) * namelen;
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}
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} __attribute__ ((packed));
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dirent* readdir(DIR* dirp)
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{
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if (!dirp)
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return nullptr;
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if (dirp->fd == -1)
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return nullptr;
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if (!dirp->buffer) {
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// FIXME: Figure out how much to actually allocate.
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dirp->buffer = (char*)malloc(4096);
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ssize_t nread = syscall(SC_get_dir_entries, dirp->fd, dirp->buffer, 4096);
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dirp->buffer_size = nread;
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dirp->nextptr = dirp->buffer;
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}
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if (dirp->nextptr >= (dirp->buffer + dirp->buffer_size))
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return nullptr;
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auto* sys_ent = (sys_dirent*)dirp->nextptr;
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dirp->cur_ent.d_ino = sys_ent->ino;
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dirp->cur_ent.d_type = sys_ent->file_type;
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dirp->cur_ent.d_off = 0;
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dirp->cur_ent.d_reclen = sys_ent->total_size();
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for (size_t i = 0; i < sys_ent->namelen; ++i)
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dirp->cur_ent.d_name[i] = sys_ent->name[i];
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// FIXME: I think this null termination behavior is not supposed to be here.
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dirp->cur_ent.d_name[sys_ent->namelen] = '\0';
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dirp->nextptr += sys_ent->total_size();
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return &dirp->cur_ent;
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}
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}
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