#include <stdio.h>
#include <assert.h>

char *gets(data)
	register char *data;
	{
	register char *p = data;
	register int c;

	assert((data != NULL));
	
	while(((c = getc(stdin)) != EOF) && (c != '\n'))
		{
		if(c == '\b')
			{
			if(p > data)
				--p;
			}
		else
			*p++ = c;
		}
	*p = '\0';
	return(((c == EOF) && (p == data)) ? NULL : data);  /* NULL == EOF */
	}