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.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browser.c

@@ -593,6 +593,13 @@ unsigned int ui_browser__argv_refresh(struct ui_browser *browser)
 	return row;
 }
 
+void ui_browser__write_graph(struct ui_browser *browser __used, int graph)
+{
+	SLsmg_set_char_set(1);
+	SLsmg_write_char(graph);
+	SLsmg_set_char_set(0);
+}
+
 void ui_browser__init(void)
 {
 	int i = 0;

tools/perf/ui/browser.h

@@ -37,6 +37,7 @@ void ui_browser__refresh_dimensions(struct ui_browser *self);
 void ui_browser__reset_index(struct ui_browser *self);
 
 void ui_browser__gotorc(struct ui_browser *self, int y, int x);
+void ui_browser__write_graph(struct ui_browser *browser, int graph);
 void __ui_browser__show_title(struct ui_browser *browser, const char *title);
 void ui_browser__show_title(struct ui_browser *browser, const char *title);
 int ui_browser__show(struct ui_browser *self, const char *title,

tools/perf/ui/browsers/annotate.c

@@ -71,9 +71,7 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 		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 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 			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 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 			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(' ');
 			}