1 files changed, 103 insertions, 0 deletions

diff --git a/src/fs/read_write.c b/src/fs/read_write.c
new file mode 100644
index 0000000..341274a
--- /dev/null
+++ b/src/fs/read_write.c
@@ -0,0 +1,103 @@
+/*
+ *  linux/fs/read_write.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <sys/stat.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/segment.h>
+
+extern int rw_char(int rw,int dev, char * buf, int count, off_t * pos);
+extern int read_pipe(struct m_inode * inode, char * buf, int count);
+extern int write_pipe(struct m_inode * inode, char * buf, int count);
+extern int block_read(int dev, off_t * pos, char * buf, int count);
+extern int block_write(int dev, off_t * pos, char * buf, int count);
+extern int file_read(struct m_inode * inode, struct file * filp,
+                char * buf, int count);
+extern int file_write(struct m_inode * inode, struct file * filp,
+                char * buf, int count);
+
+int sys_lseek(unsigned int fd,off_t offset, int origin)
+{
+        struct file * file;
+        int tmp;
+
+        if (fd >= NR_OPEN || !(file=current->filp[fd]) || !(file->f_inode)
+           || !IS_SEEKABLE(MAJOR(file->f_inode->i_dev)))
+                return -EBADF;
+        if (file->f_inode->i_pipe)
+                return -ESPIPE;
+        switch (origin) {
+                case 0:
+                        if (offset<0) return -EINVAL;
+                        file->f_pos=offset;
+                        break;
+                case 1:
+                        if (file->f_pos+offset<0) return -EINVAL;
+                        file->f_pos += offset;
+                        break;
+                case 2:
+                        if ((tmp=file->f_inode->i_size+offset) < 0)
+                                return -EINVAL;
+                        file->f_pos = tmp;
+                        break;
+                default:
+                        return -EINVAL;
+        }
+        return file->f_pos;
+}
+
+int sys_read(unsigned int fd,char * buf,int count)
+{
+        struct file * file;
+        struct m_inode * inode;
+
+        if (fd>=NR_OPEN || count<0 || !(file=current->filp[fd]))
+                return -EINVAL;
+        if (!count)
+                return 0;
+        verify_area(buf,count);
+        inode = file->f_inode;
+        if (inode->i_pipe)
+                return (file->f_mode&1)?read_pipe(inode,buf,count):-EIO;
+        if (S_ISCHR(inode->i_mode))
+                return rw_char(READ,inode->i_zone[0],buf,count,&file->f_pos);
+        if (S_ISBLK(inode->i_mode))
+                return block_read(inode->i_zone[0],&file->f_pos,buf,count);
+        if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode)) {
+                if (count+file->f_pos > inode->i_size)
+                        count = inode->i_size - file->f_pos;
+                if (count<=0)
+                        return 0;
+                return file_read(inode,file,buf,count);
+        }
+        printk("(Read)inode->i_mode=%06o\n\r",inode->i_mode);
+        return -EINVAL;
+}
+
+int sys_write(unsigned int fd,char * buf,int count)
+{
+        struct file * file;
+        struct m_inode * inode;
+        
+        if (fd>=NR_OPEN || count <0 || !(file=current->filp[fd]))
+                return -EINVAL;
+        if (!count)
+                return 0;
+        inode=file->f_inode;
+        if (inode->i_pipe)
+                return (file->f_mode&2)?write_pipe(inode,buf,count):-EIO;
+        if (S_ISCHR(inode->i_mode))
+                return rw_char(WRITE,inode->i_zone[0],buf,count,&file->f_pos);
+        if (S_ISBLK(inode->i_mode))
+                return block_write(inode->i_zone[0],&file->f_pos,buf,count);
+        if (S_ISREG(inode->i_mode))
+                return file_write(inode,file,buf,count);
+        printk("(Write)inode->i_mode=%06o\n\r",inode->i_mode);
+        return -EINVAL;
+}