perf ui gtk: Add perf_gtk__show_helpline() for pr_*

Use helpline for printing error/debug messages. The code resembles a TUI
counter part and only print the first line of the message.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1345104894-14205-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/tools/perf/ui/gtk/helpline.c b/tools/perf/ui/gtk/helpline.c
index 2511b3746797..5db4432ff12a 100644
--- a/tools/perf/ui/gtk/helpline.c
+++ b/tools/perf/ui/gtk/helpline.c
@@ -1,5 +1,10 @@
+#include <stdio.h>
+#include <string.h>
+
 #include "gtk.h"
+#include "../ui.h"
 #include "../helpline.h"
+#include "../../util/debug.h"
 
 static void gtk_helpline_pop(void)
 {
@@ -28,3 +33,24 @@ void perf_gtk__init_helpline(void)
 {
         helpline_fns = &gtk_helpline_fns;
 }
+
+int perf_gtk__show_helpline(const char *fmt, va_list ap)
+{
+        int ret;
+        char *ptr;
+        static int backlog;
+
+        ret = vscnprintf(ui_helpline__current + backlog,
+                         sizeof(ui_helpline__current) - backlog, fmt, ap);
+        backlog += ret;
+
+        /* only first line can be displayed */
+        ptr = strchr(ui_helpline__current, '\n');
+        if (ptr && (ptr - ui_helpline__current) <= backlog) {
+                *ptr = '\0';
+                ui_helpline__puts(ui_helpline__current);
+                backlog = 0;
+        }
+
+        return ret;
+}