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truetypefs: use /lib/font/ttf as default font path

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

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

@@ -9,6 +9,8 @@

 static char Egreg[] = "my memory of truetype is fading";

 static char Enoent[] = "not found";

+static char *fontpath = "/lib/font/ttf";

+

 enum { MAXSUB = 0x100 };

 typedef struct TFont TFont;

@@ -219,7 +221,11 @@

 		goto inval;

 	buf = estrdup9p(name);

 	buf[d - name] = 0;

-	ttf = ttfopen(buf, sz, 0);

+	p = smprint("%s/%s", fontpath, buf);

+	if(p == nil)

+		sysfatal("smprint: %r");

+	ttf = ttfopen(p, sz, 0);

+	free(p);

 	if(ttf == nil){

 		free(buf);

 		return nil;

@@ -420,12 +426,22 @@

 	.destroyfid = fsdestroyfid,

 };

+static void

+usage(void)

+{

+	fprint(2, "usage: %s [-F fontpath]\n", argv0);

+	exits("usage");

+}

+

 void

 main(int argc, char **argv)

 {

 	ARGBEGIN {

+	case 'F':

+		fontpath = EARGF(usage());

+		break;

 	default:

-		sysfatal("usage");

+		usage();

 	} ARGEND;

 	unmount(nil, "/n/ttf");