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/* Copyright (C) 1995,1996,1998,1999,2000,2001, 2002, 2003, 2006 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 2.1 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
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include "libguile/_scm.h"
#include "libguile/eval.h"
#include "libguile/chars.h"
#include "libguile/fports.h"
#include "libguile/root.h"
#include "libguile/strings.h"
#include "libguile/vectors.h"
#include "libguile/validate.h"
#include "libguile/vports.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
/* {Ports - soft ports}
*
*/
static scm_t_bits scm_tc16_sfport;
static void
sf_flush (SCM port)
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);
SCM stream = SCM_PACK (pt->stream);
if (pt->write_pos > pt->write_buf)
{
/* write the byte. */
scm_call_1 (SCM_SIMPLE_VECTOR_REF (stream, 0),
SCM_MAKE_CHAR (*pt->write_buf));
pt->write_pos = pt->write_buf;
/* flush the output. */
{
SCM f = SCM_SIMPLE_VECTOR_REF (stream, 2);
if (scm_is_true (f))
scm_call_0 (f);
}
}
}
static void
sf_write (SCM port, const void *data, size_t size)
{
SCM p = SCM_PACK (SCM_STREAM (port));
scm_call_1 (SCM_SIMPLE_VECTOR_REF (p, 1),
scm_from_locale_stringn ((char *) data, size));
}
/* calling the flush proc (element 2) is in case old code needs it,
but perhaps softports could the use port buffer in the same way as
fports. */
/* places a single char in the input buffer. */
static int
sf_fill_input (SCM port)
{
SCM p = SCM_PACK (SCM_STREAM (port));
SCM ans;
ans = scm_call_0 (SCM_SIMPLE_VECTOR_REF (p, 3)); /* get char. */
if (scm_is_false (ans) || SCM_EOF_OBJECT_P (ans))
return EOF;
SCM_ASSERT (SCM_CHARP (ans), ans, SCM_ARG1, "sf_fill_input");
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);
*pt->read_buf = SCM_CHAR (ans);
pt->read_pos = pt->read_buf;
pt->read_end = pt->read_buf + 1;
return *pt->read_buf;
}
}
static int
sf_close (SCM port)
{
SCM p = SCM_PACK (SCM_STREAM (port));
SCM f = SCM_SIMPLE_VECTOR_REF (p, 4);
if (scm_is_false (f))
return 0;
f = scm_call_0 (f);
errno = 0;
return scm_is_false (f) ? EOF : 0;
}
static int
sf_input_waiting (SCM port)
{
SCM p = SCM_PACK (SCM_STREAM (port));
if (SCM_SIMPLE_VECTOR_LENGTH (p) >= 6)
{
SCM f = SCM_SIMPLE_VECTOR_REF (p, 5);
if (scm_is_true (f))
return scm_to_int (scm_call_0 (f));
}
/* Default is such that char-ready? for soft ports returns #t, as it
did before this extension was implemented. */
return 1;
}
SCM_DEFINE (scm_make_soft_port, "make-soft-port", 2, 0, 0,
(SCM pv, SCM modes),
"Return a port capable of receiving or delivering characters as\n"
"specified by the @var{modes} string (@pxref{File Ports,\n"
"open-file}). @var{pv} must be a vector of length 5 or 6. Its\n"
"components are as follows:\n"
"\n"
"@enumerate 0\n"
"@item\n"
"procedure accepting one character for output\n"
"@item\n"
"procedure accepting a string for output\n"
"@item\n"
"thunk for flushing output\n"
"@item\n"
"thunk for getting one character\n"
"@item\n"
"thunk for closing port (not by garbage collection)\n"
"@item\n"
"(if present and not @code{#f}) thunk for computing the number of\n"
"characters that can be read from the port without blocking.\n"
"@end enumerate\n"
"\n"
"For an output-only port only elements 0, 1, 2, and 4 need be\n"
"procedures. For an input-only port only elements 3 and 4 need\n"
"be procedures. Thunks 2 and 4 can instead be @code{#f} if\n"
"there is no useful operation for them to perform.\n"
"\n"
"If thunk 3 returns @code{#f} or an @code{eof-object}\n"
"(@pxref{Input, eof-object?, ,r5rs, The Revised^5 Report on\n"
"Scheme}) it indicates that the port has reached end-of-file.\n"
"For example:\n"
"\n"
"@lisp\n"
"(define stdout (current-output-port))\n"
"(define p (make-soft-port\n"
" (vector\n"
" (lambda (c) (write c stdout))\n"
" (lambda (s) (display s stdout))\n"
" (lambda () (display \".\" stdout))\n"
" (lambda () (char-upcase (read-char)))\n"
" (lambda () (display \"@@\" stdout)))\n"
" \"rw\"))\n"
"\n"
"(write p p) @result{} #<input-output: soft 8081e20>\n"
"@end lisp")
#define FUNC_NAME s_scm_make_soft_port
{
int vlen;
scm_t_port *pt;
SCM z;
SCM_VALIDATE_VECTOR (1, pv);
vlen = SCM_SIMPLE_VECTOR_LENGTH (pv);
SCM_ASSERT ((vlen == 5) || (vlen == 6), pv, 1, FUNC_NAME);
SCM_VALIDATE_STRING (2, modes);
scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex);
z = scm_new_port_table_entry (scm_tc16_sfport);
pt = SCM_PTAB_ENTRY (z);
scm_port_non_buffer (pt);
SCM_SET_CELL_TYPE (z, scm_tc16_sfport | scm_i_mode_bits (modes));
SCM_SETSTREAM (z, SCM_UNPACK (pv));
scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex);
return z;
}
#undef FUNC_NAME
static scm_t_bits
scm_make_sfptob ()
{
scm_t_bits tc = scm_make_port_type ("soft", sf_fill_input, sf_write);
scm_set_port_mark (tc, scm_markstream);
scm_set_port_flush (tc, sf_flush);
scm_set_port_close (tc, sf_close);
scm_set_port_input_waiting (tc, sf_input_waiting);
return tc;
}
void
scm_init_vports ()
{
scm_tc16_sfport = scm_make_sfptob ();
#include "libguile/vports.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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