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mothra: read the content-type header over file(1) to determine type (thanks james palmer)

this fixes some pages being classified as xml by file(1),
meaning they would be rendered as plain text rather than as html.

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -1017,8 +1017,9 @@

 		message("getting %s", selection->fullname);

 		if(mothmode && !plumb)

 			typ = -1;

-		else

+		else if((typ = mimetotype(selection->contenttype)) < 0)

 			typ = snooptype(fd);

+

 		switch(typ){

 		default:

 			if(plumb){

--- a/sys/src/cmd/mothra/mothra.h

+++ b/sys/src/cmd/mothra/mothra.h

@@ -28,6 +28,7 @@

 	char *reltext;

 	char fullname[NNAME];

 	char tag[NNAME];

+	char contenttype[NNAME];

 	int map;		/* is this an image map? */

 };

 struct Www{

@@ -97,6 +98,7 @@

 #pragma	varargck type "U" char*

 void message(char *, ...);

 int filetype(int, char *, int);

+int mimetotype(char *);

 int snooptype(int);

 void mkfieldpanel(Rtext *);

 void geturl(char *, int, int, int);

--- a/sys/src/cmd/mothra/snoop.c

+++ b/sys/src/cmd/mothra/snoop.c

@@ -87,8 +87,9 @@

 }

 int

-snooptype(int fd)

+mimetotype(char *mime)

 {

+	int i;

 	static struct {

 		char	*typ;

 		int	val;

@@ -110,13 +111,23 @@

 	"image/",			PAGE,

 	"text/",			PLAIN,

 	"message/rfc822",		PLAIN,

-	};

+	};	

+

+	for(i=0; i<nelem(tab); i++)

+		if(strncmp(mime, tab[i].typ, strlen(tab[i].typ)) == 0)

+			return tab[i].val;

+			

+	return -1;

+}

+

+int

+snooptype(int fd)

+{

 	char buf[128];

 	int i;

+	

 	if(filetype(fd, buf, sizeof(buf)) < 0)

 		return -1;

-	for(i=0; i<nelem(tab); i++)

-		if(strncmp(buf, tab[i].typ, strlen(tab[i].typ)) == 0)

-			return tab[i].val;

-	return -1;

+		

+	return mimetotype(buf);

 }

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

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

@@ -215,6 +215,9 @@

 	snprint(buf+n, sizeof(buf)-n, "/parsed/fragment");

 	readstr(buf, url->tag, sizeof(url->tag));

+	

+	snprint(buf+n, sizeof(buf)-n, "/contenttype");

+	readstr(buf, url->contenttype, sizeof(url->contenttype));

 	snprint(buf+n, sizeof(buf)-n, "/contentencoding");

 	readstr(buf, buf, sizeof(buf));