mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-29 19:30:36 +02:00
1234bb1850
Update to newest recommended license notices from the FSF. Everything stays LGPLv3+ except guile-readline which is GPLv3+.
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/* Copyright 2008,2014,2018
|
||
Free Software Foundation, Inc.
|
||
|
||
This file is part of Guile.
|
||
|
||
Guile 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.
|
||
|
||
Guile 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 Guile. If not, see
|
||
<https://www.gnu.org/licenses/>. */
|
||
|
||
/* 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 <assert.h>
|
||
#include <string.h>
|
||
#include <libguile.h>
|
||
|
||
|
||
|
||
/* Size of our port's internal buffer. */
|
||
#define PORT_BUFFER_SIZE 1024
|
||
|
||
struct custom_port
|
||
{
|
||
size_t pos;
|
||
size_t len;
|
||
char *buf;
|
||
};
|
||
|
||
|
||
/* Return a new port of type PORT_TYPE. */
|
||
static inline SCM
|
||
make_port (scm_t_port_type *port_type)
|
||
{
|
||
struct custom_port *stream = scm_gc_typed_calloc (struct custom_port);
|
||
|
||
stream->pos = 0;
|
||
stream->len = PORT_BUFFER_SIZE;
|
||
stream->buf = scm_gc_calloc (stream->len, "custom-port-buffer");
|
||
|
||
return scm_c_make_port (port_type, SCM_RDNG, (scm_t_bits) stream);
|
||
}
|
||
|
||
static size_t
|
||
custom_port_read (SCM port, SCM dst, size_t start, size_t count)
|
||
{
|
||
size_t to_copy = count;
|
||
struct custom_port *stream = (void *) SCM_STREAM (port);
|
||
|
||
if (stream->pos + to_copy > stream->len)
|
||
to_copy = stream->len - stream->pos;
|
||
|
||
memcpy (SCM_BYTEVECTOR_CONTENTS (dst) + start,
|
||
stream->buf + stream->pos, to_copy);
|
||
stream->pos += to_copy;
|
||
|
||
return to_copy;
|
||
}
|
||
|
||
/* 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_port_type *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", custom_port_read, 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;
|
||
}
|