/* 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);
}
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);
}