tools/perf/ui/helpline.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 #include "../debug.h"
   7 #include "helpline.h"
   8 #include "ui.h"
   9 #include "../util.h"
  10
  11 char ui_helpline__current[512];
  12
  13 static void nop_helpline__pop(void)
  14 {
  15 }
  16
  17 static void nop_helpline__push(const char *msg __maybe_unused)
  18 {
  19 }
  20
  21 static int nop_helpline__show(const char *fmt __maybe_unused,
  22                                va_list ap __maybe_unused)
  23 {
  24         return 0;
  25 }
  26
  27 static struct ui_helpline default_helpline_fns = {
  28         .pop    = nop_helpline__pop,
  29         .push   = nop_helpline__push,
  30         .show   = nop_helpline__show,
  31 };
  32
  33 struct ui_helpline *helpline_fns = &default_helpline_fns;
  34
  35 void ui_helpline__pop(void)
  36 {
  37         helpline_fns->pop();
  38 }
  39
  40 void ui_helpline__push(const char *msg)
  41 {
  42         helpline_fns->push(msg);
  43 }
  44
  45 void ui_helpline__vpush(const char *fmt, va_list ap)
  46 {
  47         char *s;
  48
  49         if (vasprintf(&s, fmt, ap) < 0)
  50                 vfprintf(stderr, fmt, ap);
  51         else {
  52                 ui_helpline__push(s);
  53                 free(s);
  54         }
  55 }
  56
  57 void ui_helpline__fpush(const char *fmt, ...)
  58 {
  59         va_list ap;
  60
  61         va_start(ap, fmt);
  62         ui_helpline__vpush(fmt, ap);
  63         va_end(ap);
  64 }
  65
  66 void ui_helpline__puts(const char *msg)
  67 {
  68         ui_helpline__pop();
  69         ui_helpline__push(msg);
  70 }
  71
  72 int ui_helpline__vshow(const char *fmt, va_list ap)
  73 {
  74         return helpline_fns->show(fmt, ap);
  75 }
  76
  77 void ui_helpline__printf(const char *fmt, ...)
  78 {
  79         va_list ap;
  80
  81         ui_helpline__pop();
  82         va_start(ap, fmt);
  83         ui_helpline__vpush(fmt, ap);
  84         va_end(ap);
  85 }