#include <u.h>#include <libc.h>#include <webfs.h> char *mntwebfs = "/mnt/web"; Webfs*webfs(char *url, ...){	int ctlfd, n;	char buf[1024+1];	va_list arg;	Webfs *w; 	snprint(buf, sizeof(buf), "%s/clone", mntwebfs);	if((ctlfd = open(buf, ORDWR)) < 0)		return nil; 	if((n = read(ctlfd, buf, sizeof(buf-1))) <= 0){		close(ctlfd);		return nil;	}	buf[n] = 0; 	w = mallocz(sizeof(*w), 1);	if(w == nil){		close(ctlfd);		return nil;	} 	w->conn = atoi(buf);	w->ctlfd = ctlfd;	w->bodyfd = -1; 	va_start(arg, url);	vsnprint(w->url, sizeof(w->url), url, arg);	va_end(arg); 	return w;} intwebfshdr(Webfs *w, char *key, char *value){	int n;	char hdr[256]; 	n = snprint(hdr, sizeof(hdr), "headers %s: %s", key, value); 	if(write(w->ctlfd, hdr, n) != n)		return -1;	return 0;} static intdoreq(Webfs *w){	int fd, n;	char buf[1024]; 	n = snprint(buf, sizeof(buf), "url %s", w->url);	if(write(w->ctlfd, buf, n) != n)		return -1; 	if(w->useragent[0]){		n = snprint(buf, sizeof(buf), "useragent %s", w->useragent);		if(write(w->ctlfd, buf, n) != n)			return -1;	} 	if(w->method[0]){		n = snprint(buf, sizeof(buf), "request %s", w->method);		if(write(w->ctlfd, buf, n) != n)			return -1;	} 	if(w->postbody != nil && w->npostbody > 0){		snprint(buf, sizeof(buf), "%s/%d/postbody", mntwebfs, w->conn);		fd = open(buf, ORDWR);		if(fd < 0)			return -1;		n = write(fd, w->postbody, w->npostbody);		close(fd);		if(n != w->npostbody){			return -1;		}	} 	snprint(buf, sizeof(buf), "%s/%d/body", mntwebfs, w->conn);	fd = open(buf, OREAD);	if(fd < 0)		return -1; 	w->bodyfd = fd; 	return 0;} char *webfsget(Webfs *w){	int n;	char *buf; 	if(doreq(w) < 0)		return nil; 	buf = mallocz(8192+1, 1);	n = read(w->bodyfd, buf, 8192);	if(n < 0){		free(buf);		return nil;	} 	buf[n] = 0;	return buf;} char *webfspost(Webfs *w, char *body){	w->postbody = strdup(body);	w->npostbody = strlen(body); 	return webfsget(w);} voidwebfsfree(Webfs *w){	if(w->ctlfd >= 0)		close(w->ctlfd);	if(w->bodyfd >= 0)		close(w->bodyfd);	if(w->postbody != nil)		free(w->postbody);	free(w);}