2.9BSD/usr/src/cmd/refer/refer/refer8.c

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# include "refer.h"
static char ahead[LLINE];
static int peeked 0;
static int noteof 1;

char *
input (s)
char *s;
{
	if (peeked)
	{
		peeked=0;
		if (noteof==0) return(0);
		strcpy (s, ahead);
		return(s);
	}
	return(fgets(s, LLINE, in));
}
char *
lookat()
{
	if (peeked) return(ahead);
	noteof=input(ahead);
	peeked=1;
	return(noteof);
}
addch(s, c)
char *s;
{
	while (*s) s++;
	*s++ = c;
	*s = 0;
}