LXR linux/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 <pthread.h>
   6
   7#include "../../util/debug.h"
   8#include "../helpline.h"
   9#include "../ui.h"
  10#include "../libslang.h"
  11
  12char ui_helpline__last_msg[1024];
  13bool tui_helpline__set;
  14
  15static void tui_helpline__pop(void)
  16{
  17}
  18
  19static 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((char *)msg, SLtt_Screen_Cols);
  26        SLsmg_refresh();
  27        strlcpy(ui_helpline__current, msg, sz);
  28}
  29
  30static int tui_helpline__show(const char *format, va_list ap)
  31{
  32        int ret;
  33        static int backlog;
  34
  35        pthread_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        pthread_mutex_unlock(&ui__lock);
  48
  49        return ret;
  50}
  51
  52struct ui_helpline tui_helpline_fns = {
  53        .pop    = tui_helpline__pop,
  54        .push   = tui_helpline__push,
  55        .show   = tui_helpline__show,
  56};
  57
  58void ui_helpline__init(void)
  59{
  60        helpline_fns = &tui_helpline_fns;
  61        ui_helpline__puts(" ");
  62}
  63