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dev: mount fonts from given paths

If the second argument of the "x f" command contains a slash, neatroff
assumes that it is the path of the font description file.  Otherwise,
as before, the font is looked up in the output device directory.

--- a/dev.c

+++ b/dev.c

@@ -30,7 +30,10 @@

 	struct font *fn;

 	if (pos >= NFONTS)

 		return -1;

-	sprintf(path, "%s/dev%s/%s", dev_dir, dev_dev, name);

+	if (strchr(name, '/'))

+		strcpy(path, name);

+	else

+		sprintf(path, "%s/dev%s/%s", dev_dir, dev_dev, name);

 	fn = font_open(path);

 	if (!fn)

 		return -1;

@@ -37,7 +40,7 @@

 	if (fn_font[pos])

 		font_close(fn_font[pos]);

 	if (fn_name[pos] != name)	/* ignore if fn_name[pos] is passed */

-		strcpy(fn_name[pos], id);

+		snprintf(fn_name[pos], sizeof(fn_name[pos]), "%s", id);

 	fn_font[pos] = fn;

 	return pos;

 }