1 files changed, 69 insertions, 0 deletions

diff --git a/tools/perf/util/ui/helpline.c b/tools/perf/util/ui/helpline.c
new file mode 100644
index 000000000000..8d79daa4458a
--- /dev/null
+++ b/tools/perf/util/ui/helpline.c
@@ -0,0 +1,69 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <newt.h>
+
+#include "../debug.h"
+#include "helpline.h"
+
+void ui_helpline__pop(void)
+{
+        newtPopHelpLine();
+}
+
+void ui_helpline__push(const char *msg)
+{
+        newtPushHelpLine(msg);
+}
+
+void ui_helpline__vpush(const char *fmt, va_list ap)
+{
+        char *s;
+
+        if (vasprintf(&s, fmt, ap) < 0)
+                vfprintf(stderr, fmt, ap);
+        else {
+                ui_helpline__push(s);
+                free(s);
+        }
+}
+
+void ui_helpline__fpush(const char *fmt, ...)
+{
+        va_list ap;
+
+        va_start(ap, fmt);
+        ui_helpline__vpush(fmt, ap);
+        va_end(ap);
+}
+
+void ui_helpline__puts(const char *msg)
+{
+        ui_helpline__pop();
+        ui_helpline__push(msg);
+}
+
+void ui_helpline__init(void)
+{
+        ui_helpline__puts(" ");
+}
+
+char ui_helpline__last_msg[1024];
+
+int ui_helpline__show_help(const char *format, va_list ap)
+{
+        int ret;
+        static int backlog;
+
+        ret = vsnprintf(ui_helpline__last_msg + backlog,
+                        sizeof(ui_helpline__last_msg) - backlog, format, ap);
+        backlog += ret;
+
+        if (ui_helpline__last_msg[backlog - 1] == '\n') {
+                ui_helpline__puts(ui_helpline__last_msg);
+                newtRefresh();
+                backlog = 0;
+        }
+
+        return ret;
+}