ui browser: Add method to write graphical characters

To save typing on the switch char set slang stuff.

It also helps in removing more slang direct calls, wrapping them at the
ui_browser level, where at some point I'll try to implement those in
terms of GTK+.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-63yhb2htv9g3g1olmojzptkd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 38f4c6f..c3fc6f3 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -71,9 +71,7 @@
 		slsmg_write_nstring(" ", 9);
 	}
 
-	SLsmg_set_char_set(1);
-	SLsmg_write_char(SLSMG_VLINE_CHAR);
-	SLsmg_set_char_set(0);
+	ui_browser__write_graph(self, SLSMG_VLINE_CHAR);
 	SLsmg_write_char(' ');
 
 	/* The scroll bar isn't being used */
@@ -116,10 +114,8 @@
 			if (ins__is_jump(dl->ins)) {
 				bool fwd = dl->ops.target > (u64)dl->offset;
 
-				SLsmg_set_char_set(1);
-				SLsmg_write_char(fwd ? SLSMG_DARROW_CHAR :
-						       SLSMG_UARROW_CHAR);
-				SLsmg_set_char_set(0);
+				ui_browser__write_graph(self, fwd ? SLSMG_DARROW_CHAR :
+								    SLSMG_UARROW_CHAR);
 				SLsmg_write_char(' ');
 			} else {
 				slsmg_write_nstring(" ", 2);
@@ -131,9 +127,7 @@
 			if (strcmp(dl->name, "retq")) {
 				slsmg_write_nstring(" ", 2);
 			} else {
-				SLsmg_set_char_set(1);
-				SLsmg_write_char(SLSMG_LARROW_CHAR);
-				SLsmg_set_char_set(0);
+				ui_browser__write_graph(self, SLSMG_LARROW_CHAR);
 				SLsmg_write_char(' ');
 			}