printers CHANGE optimize printing to file descriptor without vdprintf()
Instead of repeated opening and closing duplicated FD (converted to a
FILE stream), convert it to a FILE stream just for the first time and
then change the printing method to FILE stream printing.
diff --git a/src/printer_internal.h b/src/printer_internal.h
index 4d61285..a05b612 100644
--- a/src/printer_internal.h
+++ b/src/printer_internal.h
@@ -20,6 +20,7 @@
typedef enum LYOUT_TYPE {
LYOUT_FD, /**< file descriptor */
LYOUT_STREAM, /**< FILE stream */
+ LYOUT_FDSTREAM, /**< FILE stream based on duplicated file descriptor */
LYOUT_MEMORY, /**< memory */
LYOUT_CALLBACK /**< print via provided callback */
} LYOUT_TYPE;