/*  * 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 <auth.h>#include "imap4d.h" /* *  query the connection server */char*csquery(char *attr, char *val, char *rattr){	char token[64+4];	char buf[256], *p, *sp;	int fd, n; 	if(val == nil || val[0] == 0)		return nil;	fd = open("/net/cs", ORDWR);	if(fd < 0)		return nil;	fprint(fd, "!%s=%s", attr, val);	seek(fd, 0, 0);	snprint(token, sizeof(token), "%s=", rattr);	for(;;){		n = read(fd, buf, sizeof(buf)-1);		if(n <= 0)			break;		buf[n] = 0;		p = strstr(buf, token);		if(p != nil && (p == buf || *(p-1) == 0)){			close(fd);			sp = strchr(p, ' ');			if(sp)				*sp = 0;			p = strchr(p, '=');			if(p == nil)				return nil;			return strdup(p+1);		}	}	close(fd);	return nil;}