perf ui/helpline: Introduce ui_helpline__vshow()
[~shefty/rdma-dev.git] / 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
13 static void tui_helpline__pop(void)
14 {
15 }
16
17 static void tui_helpline__push(const char *msg)
18 {
19         const size_t sz = sizeof(ui_helpline__current);
20
21         SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
22         SLsmg_set_color(0);
23         SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
24         SLsmg_refresh();
25         strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
26 }
27
28 static int tui_helpline__show(const char *format, va_list ap)
29 {
30         int ret;
31         static int backlog;
32
33         pthread_mutex_lock(&ui__lock);
34         ret = vscnprintf(ui_helpline__last_msg + backlog,
35                         sizeof(ui_helpline__last_msg) - backlog, format, ap);
36         backlog += ret;
37
38         if (ui_helpline__last_msg[backlog - 1] == '\n') {
39                 ui_helpline__puts(ui_helpline__last_msg);
40                 SLsmg_refresh();
41                 backlog = 0;
42         }
43         pthread_mutex_unlock(&ui__lock);
44
45         return ret;
46 }
47
48 struct ui_helpline tui_helpline_fns = {
49         .pop    = tui_helpline__pop,
50         .push   = tui_helpline__push,
51         .show   = tui_helpline__show,
52 };
53
54 void ui_helpline__init(void)
55 {
56         helpline_fns = &tui_helpline_fns;
57         ui_helpline__puts(" ");
58 }