/* ct041012.c - yet another chaostreff announcement
 * by Clifford Wolf <http://www.clifford.at/cfun/cngwannounce>
 *
 * echo "obj-m := ct041012.c" > Makefile
 * make -C /usr/src/linux-2.6.7 SUBDIRS=$PWD modules
 * insmod ./ct041012.ko
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <asm/uaccess.h>

#define N (8*24*60*60+7*60*60)
#define M (60*60*24*14)

static ssize_t chaos_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{
	char text[100], *t;
	struct timeval tv;
	int len, secs;

	do_gettimeofday(&tv);
	secs = M - (tv.tv_sec + N) % M;

	len = sprintf(text, "Bis zum naechsten CNGW Chaostreff:\n"
			"%d Tage, %d Stunden, %d Minuten und %d Sekunden\n",
			secs/(60*60*24), (secs/(60*60))%24,
			(secs/60)%60, secs%60);

	if ( *ppos >= len ) return 0;

	t = text + *ppos;
	len -= *ppos;
	if (len > size) len = size;

	if ( copy_to_user(buf, text, len) ) return -EFAULT;

	*ppos += len;
	return len;
}

static struct file_operations proc_chaos_ops = { .read = chaos_read };

static int chaos_init()
{
	struct proc_dir_entry *entry;
	entry = create_proc_entry("chaos", 0, NULL);
	if (!entry) return -EBUSY;
	entry->proc_fops = &proc_chaos_ops;
	return 0;
}

static void chaos_exit()
{
	remove_proc_entry("chaos", NULL);
}

module_init(chaos_init);
module_exit(chaos_exit);

MODULE_AUTHOR("Clifford Wolf <clifford@clifford.at>");
MODULE_DESCRIPTION("The /proc/chaos driver");
MODULE_LICENSE("GPL");