kernel/tools/perf/ui/gtk/helpline.c

   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 #include "gtk.h"
   5 #include "../ui.h"
   6 #include "../helpline.h"
   7 #include "../../util/debug.h"
   8
   9 static void gtk_helpline_pop(void)
  10 {
  11         if (!perf_gtk__is_active_context(pgctx))
  12                 return;
  13
  14         gtk_statusbar_pop(GTK_STATUSBAR(pgctx->statbar),
  15                           pgctx->statbar_ctx_id);
  16 }
  17
  18 static void gtk_helpline_push(const char *msg)
  19 {
  20         if (!perf_gtk__is_active_context(pgctx))
  21                 return;
  22
  23         gtk_statusbar_push(GTK_STATUSBAR(pgctx->statbar),
  24                            pgctx->statbar_ctx_id, msg);
  25 }
  26
  27 static int gtk_helpline_show(const char *fmt, va_list ap)
  28 {
  29         int ret;
  30         char *ptr;
  31         static int backlog;
  32
  33         ret = vscnprintf(ui_helpline__current + backlog,
  34                          sizeof(ui_helpline__current) - backlog, fmt, ap);
  35         backlog += ret;
  36
  37         /* only first line can be displayed */
  38         ptr = strchr(ui_helpline__current, '\n');
  39         if (ptr && (ptr - ui_helpline__current) <= backlog) {
  40                 *ptr = '\0';
  41                 ui_helpline__puts(ui_helpline__current);
  42                 backlog = 0;
  43         }
  44
  45         return ret;
  46 }
  47
  48 static struct ui_helpline gtk_helpline_fns = {
  49         .pop    = gtk_helpline_pop,
  50         .push   = gtk_helpline_push,
  51         .show   = gtk_helpline_show,
  52 };
  53
  54 void perf_gtk__init_helpline(void)
  55 {
  56         helpline_fns = &gtk_helpline_fns;
  57 }