tools/perf/util/ui/helpline.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "../debug.h"
   6 #include "helpline.h"
   7 #include "ui.h"
   8 #include "libslang.h"
   9
  10 void ui_helpline__pop(void)
  11 {
  12 }
  13
  14 char ui_helpline__current[512];
  15
  16 void ui_helpline__push(const char *msg)
  17 {
  18         const size_t sz = sizeof(ui_helpline__current);
  19
  20         SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
  21         SLsmg_set_color(0);
  22         SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
  23         SLsmg_refresh();
  24         strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
  25 }
  26
  27 void ui_helpline__vpush(const char *fmt, va_list ap)
  28 {
  29         char *s;
  30
  31         if (vasprintf(&s, fmt, ap) < 0)
  32                 vfprintf(stderr, fmt, ap);
  33         else {
  34                 ui_helpline__push(s);
  35                 free(s);
  36         }
  37 }
  38
  39 void ui_helpline__fpush(const char *fmt, ...)
  40 {
  41         va_list ap;
  42
  43         va_start(ap, fmt);
  44         ui_helpline__vpush(fmt, ap);
  45         va_end(ap);
  46 }
  47
  48 void ui_helpline__puts(const char *msg)
  49 {
  50         ui_helpline__pop();
  51         ui_helpline__push(msg);
  52 }
  53
  54 void ui_helpline__init(void)
  55 {
  56         ui_helpline__puts(" ");
  57 }
  58
  59 char ui_helpline__last_msg[1024];
  60
  61 int ui_helpline__show_help(const char *format, va_list ap)
  62 {
  63         int ret;
  64         static int backlog;
  65
  66         pthread_mutex_lock(&ui__lock);
  67         ret = vscnprintf(ui_helpline__last_msg + backlog,
  68                         sizeof(ui_helpline__last_msg) - backlog, format, ap);
  69         backlog += ret;
  70
  71         if (ui_helpline__last_msg[backlog - 1] == '\n') {
  72                 ui_helpline__puts(ui_helpline__last_msg);
  73                 SLsmg_refresh();
  74                 backlog = 0;
  75         }
  76         pthread_mutex_unlock(&ui__lock);
  77
  78         return ret;
  79 }