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/** @file usermem.h
*
* @brief userspace r/w functions.
*
* @author Hanjie Wu (hanjiew)
* @bug No functional bugs
*/
#ifndef _USERMEM_H_
#define _USERMEM_H_
#include <stdint.h>
#include <common_kern.h>
#include <paging.h>
/**
* @brief copy bytes from userspace
* @param addr address of user memory
* @param size number of bytes
* @param buf buffer
* @return 0 on success, -1 on failure
*/
int copy_from_user(va_t addr, int size, void* buf);
/**
* @brief copy bytes to userspace
* @param addr address of user memory
* @param size number of bytes
* @param buf buffer
* @return 0 on success, -1 on failure
*/
int copy_to_user(va_t addr, int size, void* buf);
/**
* @brief try to copy a string from userspace
* @param addr address of user memory
* @param maxlen maximum length of the string including the null byte
* @return NULL on failure, a string allocated by malloc() on success
*/
char* copy_string_from_user(va_t addr, int maxlen);
/**
* @brief try to print a buffer from userspace
* @param addr address of user memory
* @param maxlen maximum length of to print
* @return 0 on success, -1 on failure
*/
int print_buf_from_user(va_t addr, int maxlen);
#endif
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