From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon,  9 Oct 1995 02:02:35 -0400
From: rob@plan9.att.com rob@plan9.att.com
Subject: reading selected text in acme
Topicbox-Message-UUID: 2c3f6270-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19951009060235.BSagiskPPNiu7zbH9YUhodP9tD2YinKUMpAOB6J0x9A@z>

#include <u.h>
#include <libc.h>

/* assumes chars==characters.  fixing this is an exercise for the reader */

void
main(void)
{
	int c, a, d, x1, x2;
	char buf[256];

	c = open("/mnt/acme/1/ctl", ORDWR);
	a = open("/mnt/acme/1/addr", OREAD);
	d = open("/mnt/acme/1/data", OREAD);
	write(c, "addr=dot", 8);
	read(a, buf, sizeof buf);
	x1 = atoi(buf);
	x2 = atoi(buf+12);
	seek(d, x1, 0);
	read(d, buf, x2-x1);
	write(1, buf, x2-x1);
	exits(0);
}