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https://github.com/DragonOS-Community/DragonOS.git
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71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
#include "dirent.h"
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#include "unistd.h"
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#include "stdio.h"
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#include "fcntl.h"
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#include "stddef.h"
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#include "stdlib.h"
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#include "string.h"
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#include <libsystem/syscall.h>
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/**
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* @brief 打开文件夹
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*
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* @param dirname
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* @return DIR*
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*/
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struct DIR *opendir(const char *path)
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{
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int fd = open(path, O_DIRECTORY);
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if (fd < 0) // 目录打开失败
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return NULL;
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// 分配DIR结构体
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struct DIR *dirp = (struct DIR *)malloc(sizeof(struct DIR));
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memset(dirp, 0, sizeof(struct DIR));
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dirp->fd = fd;
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dirp->buf_len = DIR_BUF_SIZE;
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dirp->buf_pos = 0;
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return dirp;
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}
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/**
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* @brief 关闭文件夹
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*
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* @param dirp DIR结构体指针
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* @return int 成功：0， 失败：-1
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+--------+--------------------------------+
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| errno | 描述 |
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+--------+--------------------------------+
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| 0 | 成功 |
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| -EBADF | 当前dirp不指向一个打开了的目录 |
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| -EINTR | 函数执行期间被信号打断 |
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+--------+--------------------------------+
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*/
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int closedir(struct DIR *dirp)
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{
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int retval = close(dirp->fd);
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free(dirp);
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return retval;
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}
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int64_t getdents(int fd, struct dirent *dirent, long count)
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{
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return syscall_invoke(SYS_GET_DENTS, fd, (uint64_t)dirent, count, 0, 0, 0, 0, 0);
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}
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/**
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* @brief 从目录中读取数据
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*
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* @param dir
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* @return struct dirent*
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*/
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struct dirent *reaaddir(struct DIR *dir)
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{
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memset(dir, 0, DIR_BUF_SIZE);
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int len = getdents(dir->fd, (struct dirent *)dir->buf, DIR_BUF_SIZE);
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if (len > 0)
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return (struct dirent *)dir->buf;
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else
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return NULL;
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} |