C++ (Cpp) SCM_INPUT_PORT_P示例

示例#1

文件： fports.c 项目： AtomicKity/guile

/* create FPORT buffer with specified sizes (or -1 to use default size or
   0 for no buffer.  */
static void
scm_fport_buffer_add (SCM port, long read_size, int write_size)
#define FUNC_NAME "scm_fport_buffer_add"
{
  scm_t_port *pt = SCM_PTAB_ENTRY (port);

  if (read_size == -1 || write_size == -1)
    {
      size_t default_size;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
      struct stat st;
      scm_t_fport *fp = SCM_FSTREAM (port);
      
      default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size
	: st.st_blksize;
#else
      default_size = default_buffer_size;
#endif
      if (read_size == -1)
	read_size = default_size;
      if (write_size == -1)
	write_size = default_size;
    }

  if (SCM_INPUT_PORT_P (port) && read_size > 0)
    {
      pt->read_buf = scm_gc_malloc_pointerless (read_size, "port buffer");
      pt->read_pos = pt->read_end = pt->read_buf;
      pt->read_buf_size = read_size;
    }
  else
    {
      pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf;
      pt->read_buf_size = 1;
    }

  if (SCM_OUTPUT_PORT_P (port) && write_size > 0)
    {
      pt->write_buf = scm_gc_malloc_pointerless (write_size, "port buffer");
      pt->write_pos = pt->write_buf;
      pt->write_buf_size = write_size;
    }
  else
    {
      pt->write_buf = pt->write_pos = &pt->shortbuf;
      pt->write_buf_size = 1;
    }

  pt->write_end = pt->write_buf + pt->write_buf_size;
  if (read_size > 0 || write_size > 0)
    SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0);
  else
    SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0);
}

示例#2

文件： mu_port.c 项目： ssvlab/esbmc-gpu

static void
mu_port_alloc_buffer (SCM port, size_t read_size, size_t write_size)
{
  scm_port *pt = SCM_PTAB_ENTRY (port);
  static char *s_mu_port_alloc_buffer = "mu_port_alloc_buffer";
  
  if (!read_size)
    read_size = DEFAULT_BUF_SIZE;
  if (!write_size)
    write_size = DEFAULT_BUF_SIZE;

  if (SCM_INPUT_PORT_P (port))
    {
      pt->read_buf = malloc (read_size);
      if (pt->read_buf == NULL)
	scm_memory_error (s_mu_port_alloc_buffer);
      pt->read_pos = pt->read_end = pt->read_buf;
      pt->read_buf_size = read_size;
    }
  else
    {
      pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf;
      pt->read_buf_size = 1;
    }
  
  if (SCM_OUTPUT_PORT_P (port))
    {
      pt->write_buf = malloc (write_size);
      if (pt->write_buf == NULL)
	scm_memory_error (s_mu_port_alloc_buffer);
      pt->write_pos = pt->write_buf;
      pt->write_buf_size = write_size;
      pt->write_end = pt->write_buf + pt->write_buf_size;
    }
  else
    {
      pt->write_buf = pt->write_pos = &pt->shortbuf;
      pt->write_buf_size = 1;
    }
  
  SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0);
}