/*  * 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 <libc.h>#include <bio.h>#include "authcmdlib.h" intreadarg(int fd, char *arg, int len){	char buf[1];	int i; 	i = 0;	memset(arg, 0, len);	while(read(fd, buf, 1) == 1){		if(i < len - 1)			arg[i++] = *buf;		if(*buf == '\0'){			arg[i] = '\0';			return 0;		}	}	return -1;}