tools/perf/ui/tui/helpline.c

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