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 static void tui_helpline__pop(void)
  12 {
  13 }
  14
  15 static void tui_helpline__push(const char *msg)
  16 {
  17         const size_t sz = sizeof(ui_helpline__current);
  18
  19         SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
  20         SLsmg_set_color(0);
  21         SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
  22         SLsmg_refresh();
  23         strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
  24 }
  25
  26 struct ui_helpline tui_helpline_fns = {
  27         .pop    = tui_helpline__pop,
  28         .push   = tui_helpline__push,
  29 };
  30
  31 void ui_helpline__init(void)
  32 {
  33         helpline_fns = &tui_helpline_fns;
  34         ui_helpline__puts(" ");
  35 }
  36
  37 char ui_helpline__last_msg[1024];
  38
  39 int ui_helpline__show_help(const char *format, va_list ap)
  40 {
  41         int ret;
  42         static int backlog;
  43
  44         pthread_mutex_lock(&ui__lock);
  45         ret = vscnprintf(ui_helpline__last_msg + backlog,
  46                         sizeof(ui_helpline__last_msg) - backlog, format, ap);
  47         backlog += ret;
  48
  49         if (ui_helpline__last_msg[backlog - 1] == '\n') {
  50                 ui_helpline__puts(ui_helpline__last_msg);
  51                 SLsmg_refresh();
  52                 backlog = 0;
  53         }
  54         pthread_mutex_unlock(&ui__lock);
  55
  56         return ret;
  57 }