jehanne/sys/src/cmd/cat.c

/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include <u.h>
#include <lib9.h>

void
cat(int f, char *s)
{
	char buf[8192];
	int32_t n;

	while((n=jehanne_read(f, buf, (int32_t)sizeof buf))>0)
		if(jehanne_write(1, buf, n)!=n)
			sysfatal("write error copying %s: %r", s);
	if(n < 0)
		sysfatal("error reading %s: %r", s);
}

void
main(int argc, char *argv[])
{
	int f, i;

	argv0 = "cat";
	if(argc == 1)
		cat(0, "<stdin>");
	else for(i=1; i<argc; i++){
		f = sys_open(argv[i], OREAD);
		if(f < 0)
			sysfatal("can't open %s: %r", argv[i]);
		else{
			cat(f, argv[i]);
			sys_close(f);
		}
	}
	exits(0);
}