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/* Copyright (C) 2008, 2014 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
/* Exercise `scm_c_read ()' and the port type API. Verify assumptions that
can be made by port type implementations. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#undef NDEBUG
#include <libguile.h>
#include <assert.h>
/* Size of our port's internal buffer. */
#define PORT_BUFFER_SIZE 1024
/* Return a new port of type PORT_TYPE. */
static inline SCM
make_port (scm_t_bits port_type)
{
SCM port;
char *c_buffer;
scm_t_port *c_port;
c_buffer = scm_gc_calloc (PORT_BUFFER_SIZE, "custom-port-buffer");
port = scm_new_port_table_entry (port_type);
/* Associate C_BUFFER with PORT, for test purposes. */
SCM_SETSTREAM (port, (scm_t_bits) c_buffer);
/* Use C_BUFFER as PORT's internal buffer. */
c_port = SCM_PTAB_ENTRY (port);
c_port->read_pos = c_port->read_buf = (unsigned char *) c_buffer;
c_port->read_end = (unsigned char *) c_buffer + PORT_BUFFER_SIZE;
c_port->read_buf_size = PORT_BUFFER_SIZE;
/* Mark PORT as open and readable. */
SCM_SET_CELL_TYPE (port, port_type | SCM_OPN | SCM_RDNG);
return port;
}
/* Read one byte from PORT. */
static int
fill_input (SCM port)
{
int result;
scm_t_port *c_port = SCM_PTAB_ENTRY (port);
/* Make sure that C_PORT's internal buffer wasn't changed behind our back.
See http://lists.gnu.org/archive/html/guile-devel/2008-11/msg00042.html
for an example where this assumption matters. */
assert (c_port->read_buf == (unsigned char *) SCM_STREAM (port));
assert (c_port->read_buf_size == PORT_BUFFER_SIZE);
if (c_port->read_pos >= c_port->read_end)
result = EOF;
else
result = (int) *c_port->read_pos++;
return result;
}
/* Return true (non-zero) if BUF contains only zeros. */
static inline int
zeroed_buffer_p (const char *buf, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
if (buf[i] != 0)
return 0;
return 1;
}
/* Run the test. */
static void *
do_start (void *arg)
{
SCM port;
scm_t_bits port_type;
char buffer[PORT_BUFFER_SIZE + (PORT_BUFFER_SIZE / 2)];
size_t read, last_read;
port_type = scm_make_port_type ("custom-input-port", fill_input, NULL);
port = make_port (port_type);
read = 0;
do
{
last_read = scm_c_read (port, &buffer[read], 123);
assert (last_read <= 123);
assert (zeroed_buffer_p (&buffer[read], last_read));
read += last_read;
}
while (last_read > 0 && read < sizeof (buffer));
/* We shouldn't be able to read more than what's in PORT's buffer. */
assert (read == PORT_BUFFER_SIZE);
return NULL;
}
int
main (int argc, char *argv[])
{
scm_with_guile (do_start, NULL);
return 0;
}
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