tools/perf/util/ui/helpline.c

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