tools/perf/ui/tui/helpline.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <linux/kernel.h>
   6 #include <linux/string.h>
   7
   8 #include "../helpline.h"
   9 #include "../ui.h"
  10 #include "../libslang.h"
  11
  12 char ui_helpline__last_msg[1024];
  13 bool tui_helpline__set;
  14
  15 static void tui_helpline__pop(void)
  16 {
  17 }
  18
  19 static void tui_helpline__push(const char *msg)
  20 {
  21         const size_t sz = sizeof(ui_helpline__current);
  22
  23         SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
  24         SLsmg_set_color(0);
  25         SLsmg_write_nstring(msg, SLtt_Screen_Cols);
  26         SLsmg_refresh();
  27         strlcpy(ui_helpline__current, msg, sz);
  28 }
  29
  30 static int tui_helpline__show(const char *format, va_list ap)
  31 {
  32         int ret;
  33         static int backlog;
  34
  35         mutex_lock(&ui__lock);
  36         ret = vscnprintf(ui_helpline__last_msg + backlog,
  37                         sizeof(ui_helpline__last_msg) - backlog, format, ap);
  38         backlog += ret;
  39
  40         tui_helpline__set = true;
  41
  42         if (ui_helpline__last_msg[backlog - 1] == '\n') {
  43                 ui_helpline__puts(ui_helpline__last_msg);
  44                 SLsmg_refresh();
  45                 backlog = 0;
  46         }
  47         mutex_unlock(&ui__lock);
  48
  49         return ret;
  50 }
  51
  52 struct ui_helpline tui_helpline_fns = {
  53         .pop    = tui_helpline__pop,
  54         .push   = tui_helpline__push,
  55         .show   = tui_helpline__show,
  56 };
  57
  58 void ui_helpline__init(void)
  59 {
  60         helpline_fns = &tui_helpline_fns;
  61         ui_helpline__puts(" ");
  62 }