From dccab72215d3c8c5713234ca4fbb27d1b3243969 Mon Sep 17 00:00:00 2001
From: pngwt4f59 <1351816101@qq.com>
Date: Thu, 8 Jul 2021 23:56:07 +0800
Subject: [PATCH] ADD file via upload

---
 getdents.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 getdents.c

diff --git a/getdents.c b/getdents.c
new file mode 100644
index 0000000..de118a1
--- /dev/null
+++ b/getdents.c
@@ -0,0 +1,96 @@
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <a.out.h>
+
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <asm/segment.h>
+
+struct linux_dirent {
+	long           d_ino;
+	off_t          d_off;
+	unsigned short d_reclen;
+	char           d_name[14];
+};
+
+int sys_getdents(unsigned int fd, struct linux_dirent *d, unsigned int count)
+{
+    struct file  *f;
+	struct m_inode * m;
+    struct buffer_head * b;
+    struct dir_entry * dir;
+	int i,j,k,res;
+    struct linux_dirent usrd;
+    i=0;
+    res=0;
+    f=current->filp[fd];
+    m=f->f_inode;
+    b=bread(m->i_dev,m->i_zone[0]);
+    dir=(struct dir_entry*)b->b_data;
+    while(dir[i].inode>0)
+    {
+        if(res+sizeof(struct linux_dirent)>count)
+            break;
+        usrd.d_ino=dir[i].inode;
+        usrd.d_off=0;
+        usrd.d_reclen=sizeof(struct linux_dirent);
+        for(j=0;j<14;j++)
+            usrd.d_name[j]=dir[i].name[j];
+        for(k=0;k<sizeof(struct linux_dirent);k++)
+        {
+            put_fs_byte(((char*)(&usrd))[k],(char*)d+res);
+            res++;
+        }
+        i++;
+    }
+    return res;
+}
+
+char *sys_getcwd(char* buf,size_t size)
+{
+	char *path[14];
+    int i,j,k,l,dev,inum;
+    struct m_inode *inode;
+    struct buffer_head *b;
+    struct dir_entry *d;
+    dev=current->root->i_dev;
+    inode=current->pwd;
+    inum=inode->i_num;
+    b=bread(dev,inode->i_zone[0]);
+    d=(struct dir_entry*) b->b_data;
+    i=0;
+    l=0;
+    while(inum!=1)
+    {
+        inode=iget(dev, d[1].inode);
+        b=bread(dev,inode->i_zone[0]);
+        d=(struct dir_entry*) b->b_data;
+        j=0;
+        while(d[j].inode!=inum) j++;
+        inum=inode->i_num;
+        path[i]=d[j].name;
+        i++;
+    }
+    while(i>0)
+    {
+        i--;
+        put_fs_byte('/',buf+l);
+        l++;
+        k=0;
+        while(path[i][k]!='\0')
+        {
+            put_fs_byte(path[i][k],buf+l);
+            l++;
+            if(l>=size) break;
+            k++;
+        }
+        if(l>=size) break;
+    }
+    return buf;
+}
+
+
+