#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include<linux/sched.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/slab.h>

#define PROC_FILE_NAME "read_test"

unsigned char buffer[1024];
size_t buflen;
ssize_t read_simple(struct file *filp,char *buf,size_t count,loff_t *offp ) 
{
	printk("The secret message is:  %s\n", buf); // This is backwards, but it worked in class at least
	printk("buf = %lx, count = %lu, offp = %lu\n", buf, count, *offp);
	int remainder = buflen - *offp;
	int len = (remainder < count)? remainder:count;
	strncpy(buf, buffer+(*offp), len);
	*offp += len;
	return len;
}

struct file_operations proc_fops = {
	read: read_simple,
};

int proc_init (void) {
	int i;
	for(i = 0; i < 1023; i++){
		buffer[i] = 'q';
	}
	strcpy(buffer+100, "This is a qreature!  It lives inside the q area!");
	buffer[1023] = 0;
	buflen = strlen(buffer);
	proc_create(PROC_FILE_NAME,0,NULL,&proc_fops);
	return 0;
}

void proc_cleanup(void) {
	remove_proc_entry(PROC_FILE_NAME,NULL);
}

MODULE_LICENSE("GPL"); 
module_init(proc_init);
module_exit(proc_cleanup);