util.h

USb in User space, a kernel module that use usb layer

/*
 * usu.c
 *
 * Author : Lionetti Salvatore <[e-mail]>
 * License: GPL
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef __UTIL_USU__
#define __UTIL_USU__


#include<linux/errno.h>

#ifdef __KERNEL__
#include<linux/kernel.h>
/* <1> in printk("<1>...") is considered only on new line.
 * So in !new line we see <1> with dmesg. */
#define PRINT printk
/*int printk(char *fmt,...);*/
#else
/*#include<stdio.h>*/
#define PRINT printf
#endif

#ifdef __KERNEL__
#include<linux/string.h>	/* To have memcpy(), memset().	*/
/*#include<linux/kernel.h>	 To have scnprintf().		*/
#include<asm/uaccess.h>		/* To have copy_{to,from}_user()*/
#define Snprintf(format, args...) if (l<len) l+=scnprintf(buf+l,len-l,format,##args); 
#define CopyToUser(to,from,n)	copy_to_user(to,from,n)
#define CopyFromUser(to,from,n)	copy_from_user(to,from,n)
#else
#include<string.h>
#include<stdio.h>		/* To have snprintf().		*/
#define Snprintf(format, args...) if (l<len) l+=snprintf(buf+l,len-l,format,##args); 
#define CopyToUser(to,from,n)	(memcpy(to,from,n)?0:-EFAULT)
#define CopyFromUser(to,from,n)	(memcpy(to,from,n)?0:-EFAULT)
#endif

#endif