C++ (Cpp) grub_env_find Examples

Example #1

File: env.c Project: Arvian/GRUB2

/**
* @attention 本注释得到了"核高基"科技重大专项2012年课题“开源操作系统内核分析和安全性评估
*（课题编号：2012ZX01039-004）”的资助。
*
* @copyright 注释添加单位：清华大学——03任务（Linux内核相关通用基础软件包分析）承担单位
*
* @author 注释添加人员：谢文学
*
* @date 注释添加日期：2013年6月8日
*
* @brief 导出一个环境变量。
*
* @note 注释详细内容:
*
* 本函数实现导出一个环境变量的功能。首先使用grub_env_find()找到该环境变量；如果没找到，则
* 使用grub_env_set()将其设置为“”，并重新使用grub_env_find()找到该环境变量；最后设置改环境
* 变量的global标志位1。
**/
grub_err_t
grub_env_export (const char *name)
{
  struct grub_env_var *var;

  var = grub_env_find (name);
  if (! var)
    {
      grub_err_t err;

      err = grub_env_set (name, "");
      if (err)
	return err;
      var = grub_env_find (name);
    }
  var->global = 1;

  return GRUB_ERR_NONE;
}

Example #2

File: env.c Project: 0xroot/radare2

grub_err_t
grub_env_set (const char *name, const char *val)
{
  struct grub_env_var *var;

  /* If the variable does already exist, just update the variable.  */
  var = grub_env_find (name);
  if (var)
    {
      char *old = var->value;

      if (var->write_hook)
	var->value = var->write_hook (var, val);
      else
	var->value = grub_strdup (val);

      if (! var->value)
	{
	  var->value = old;
	  return grub_errno;
	}

      grub_free (old);
      return GRUB_ERR_NONE;
    }

  /* The variable does not exist, so create a new one.  */
  var = grub_zalloc (sizeof (*var));
  if (! var)
    return grub_errno;

  /* This is not necessary. But leave this for readability.  */
  var->global = 0;

  var->name = grub_strdup (name);
  if (! var->name)
    goto fail;

  var->value = grub_strdup (val);
  if (! var->value)
    goto fail;

  grub_env_insert (grub_current_context, var);

  return GRUB_ERR_NONE;

 fail:
  grub_free (var->name);
  grub_free (var->value);
  grub_free (var);

  return grub_errno;
}

Example #3

File: env.c Project: 0xroot/radare2

grub_err_t
grub_register_variable_hook (const char *name,
			     grub_env_read_hook_t read_hook,
			     grub_env_write_hook_t write_hook)
{
  struct grub_env_var *var = grub_env_find (name);

  if (! var)
    {
      if (grub_env_set (name, "") != GRUB_ERR_NONE)
	return grub_errno;

      var = grub_env_find (name);
      /* XXX Insert an assertion?  */
    }

  var->read_hook = read_hook;
  var->write_hook = write_hook;

  return GRUB_ERR_NONE;
}

Example #4

File: env.c Project: 0xroot/radare2

char *
grub_env_get (const char *name)
{
  struct grub_env_var *var;

  var = grub_env_find (name);
  if (! var)
    return 0;

  if (var->read_hook)
    return var->read_hook (var, var->value);

  return var->value;
}

Example #5

File: env.c Project: 0xroot/radare2

void
grub_env_unset (const char *name)
{
  struct grub_env_var *var;

  var = grub_env_find (name);
  if (! var)
    return;

  if (var->read_hook || var->write_hook)
    {
      grub_env_set (name, "");
      return;
    }

  grub_env_remove (var);

  grub_free (var->name);
  grub_free (var->value);
  grub_free (var);
}