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webfs: fix memory leak in Nfmt(), use libc's new idn functions

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

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

@@ -25,10 +25,6 @@

 int	matchurl(Url *u, Url *s);

 void	freeurl(Url *u);

-/* idn */

-char*	idn2utf(char *name, char *buf, int nbuf);

-char*	utf2idn(char *name, char *buf, int nbuf);

-

 /* buq */

 int	buread(Buq *q, void *v, int l);

 int	buwrite(Buq *q, void *v, int l);

--- a/sys/src/cmd/webfs/mkfile

+++ b/sys/src/cmd/webfs/mkfile

@@ -3,6 +3,6 @@

 TARG=webfs

 HFILES=fns.h dat.h

-OFILES=sub.$O url.$O buq.$O http.$O fs.$O idn.$O

+OFILES=sub.$O url.$O buq.$O http.$O fs.$O

 </sys/src/cmd/mkone

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

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

@@ -73,15 +73,12 @@

 int

 Nfmt(Fmt *f)

 {

-	char *d, *s;

+	char d[Domlen], *s;

 	s = va_arg(f->args, char*);

-	d = emalloc(Domlen);

-	if(utf2idn(s, d, Domlen) == nil)

-		d = s;

-	fmtprint(f, "%s", d);

-	if(d != s)

-		free(d);

+	if(utf2idn(s, d, sizeof(d)) != nil)

+		s = d;

+	fmtprint(f, "%s", s);

 	return 0;

 }

-- 

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