lpt_device_t.internal_name added

src/printer/prt_escp.c

@@ -2144,6 +2144,7 @@ escp_close(void *priv)
 
 const lpt_device_t lpt_prt_escp_device = {
     "Generic ESC/P Dot-Matrix",
+    "dot_matrix",
     escp_init,
     escp_close,
     write_data,

src/printer/prt_ps.c

@@ -401,6 +401,7 @@ ps_close(void *p)
 
 const lpt_device_t lpt_prt_ps_device = {
     .name = "Generic PostScript Printer",
+    .internal_name = "postscript",
     .init = ps_init,
     .close = ps_close,
     .write_data = ps_write_data,

src/printer/prt_text.c

@@ -484,6 +484,7 @@ prnt_close(void *priv)
 
 const lpt_device_t lpt_prt_text_device = {
     "Generic Text Printer",
+    "text_prt",
     prnt_init,
     prnt_close,
     write_data,