1 #include <dirent.h>
2 #include <unistd.h>
3 #include <stdio.h>
4 #include <fcntl.h>
5 #include <stddef.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <libsystem/syscall.h>
9
10 /**
11 * @brief 打开文件夹
12 *
13 * @param dirname
14 * @return DIR*
15 */
opendir(const char * path)16 struct DIR *opendir(const char *path)
17 {
18 int fd = open(path, O_DIRECTORY);
19 if (fd < 0) // 目录打开失败
20 {
21 printf("Failed to open dir\n");
22 return NULL;
23 }
24 // printf("open dir: %s\n", path);
25
26 // 分配DIR结构体
27 struct DIR *dirp = (struct DIR *)malloc(sizeof(struct DIR));
28 // printf("dirp = %#018lx", dirp);
29 memset(dirp, 0, sizeof(struct DIR));
30 dirp->fd = fd;
31 dirp->buf_len = DIR_BUF_SIZE;
32 dirp->buf_pos = 0;
33
34 return dirp;
35 }
36
37 /**
38 * @brief 关闭文件夹
39 *
40 * @param dirp DIR结构体指针
41 * @return int 成功：0， 失败：-1
42 +--------+--------------------------------+
43 | errno | 描述 |
44 +--------+--------------------------------+
45 | 0 | 成功 |
46 | -EBADF | 当前dirp不指向一个打开了的目录 |
47 | -EINTR | 函数执行期间被信号打断 |
48 +--------+--------------------------------+
49 */
closedir(struct DIR * dirp)50 int closedir(struct DIR *dirp)
51 {
52 int retval = close(dirp->fd);
53 free(dirp);
54 return retval;
55 }
56
getdents(int fd,struct dirent * dirent,long count)57 int64_t getdents(int fd, struct dirent *dirent, long count)
58 {
59 return syscall_invoke(SYS_GET_DENTS, fd, (uint64_t)dirent, count, 0, 0, 0, 0, 0);
60 }
61 /**
62 * @brief 从目录中读取数据
63 *
64 * @param dir
65 * @return struct dirent*
66 */
readdir(struct DIR * dir)67 struct dirent *readdir(struct DIR *dir)
68 {
69 // printf("dir->buf = %#018lx\n", (dir->buf));
70 memset((dir->buf), 0, DIR_BUF_SIZE);
71 // printf("memeset_ok\n");
72 int len = getdents(dir->fd, (struct dirent *)dir->buf, DIR_BUF_SIZE);
73 // printf("len=%d\n", len);
74 if (len > 0)
75 return (struct dirent *)dir->buf;
76 else
77 return NULL;
78 }