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2.11BSD/src/usr.bin/learn/tee.c

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#ifndef lint
static char sccsid[] = "@(#)tee.c	4.2	(Berkeley)	4/25/83";
#endif not lint

#include <stdio.h>
main()
{
	int f, c;

	f = creat(".ocopy", 0666);
	while (read(0, &c, 1) == 1) {
		write (1, &c, 1);
		put(c, f);
	}
	fl(f);
	close(f);
}

static char ln[BUFSIZ];
char *p = ln;
put(c, f)
{
	*p++ = c;
	if (c == '\n') {
		fl(f);
		p=ln;
	}
}
fl(f)
{
	register char *s;

	s = ln;
	while (*s == '$' && *(s+1) == ' ')
		s += 2;
	write(f, s, p-s);
}