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webfs: fix broken baseurl handling

--- a/sys/src/cmd/webfs/client.c

+++ b/sys/src/cmd/webfs/client.c

@@ -225,6 +225,7 @@

 	Bool,

 	Int,

 	String,

+	XRel,

 	XUrl,

 	Fn,

 };

@@ -253,7 +254,7 @@

 Ctab clienttab[] = {

 	"baseurl",			XUrl,		(void*)offsetof(Client, baseurl),

-	"url",				XUrl,		(void*)offsetof(Client, url),

+	"url",				XRel,		(void*)offsetof(Client, url),

 };

 static Ctab*

@@ -270,9 +271,10 @@

 static void

 parseas(Req *r, char *arg, int type, void *a)

 {

-	Url *u;

+	Url *u, *base;

 	char e[ERRMAX];

+	base = nil;

 	switch(type){

 	case Bool:

 		if(strcmp(arg, "on")==0 || strcmp(arg, "1")==0)

@@ -284,8 +286,10 @@

 		free(*(char**)a);

 		*(char**)a = estrdup(arg);

 		break;

+	case XRel:

+		base = ((Client*)a)->baseurl;

 	case XUrl:

-		u = parseurl(arg, nil);

+		u = parseurl(arg, base);

 		if(u == nil){

 			snprint(e, sizeof e, "parseurl: %r");

 			respond(r, e);

--- a/sys/src/cmd/webfs/dat.h

+++ b/sys/src/cmd/webfs/dat.h

@@ -24,6 +24,7 @@

 {

 	Url	*url;

 	Url	*baseurl;

+

 	Ctl ctl;

 	Channel *creq;	/* chan(Req*) */

 	int num;

-- 

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