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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2011, VU University Amsterdam
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
*/
#include <SWI-Stream.h>
#include <SWI-Prolog.h>
#include <string.h>
#include <assert.h>
#define ESC 27 /* = '\e', but that is not supported in VC */
typedef struct pdt_console
{ struct pdt_console *next;
void * input_handle;
void * output_handle;
IOFUNCTIONS input_functions;
IOFUNCTIONS output_functions;
IOFUNCTIONS *org_input_functions;
IOFUNCTIONS *org_output_functions;
int closed;
} pdt_console;
static pdt_console *consoles = NULL;
static pdt_console *
find_console(void *input_handle, void *output_handle)
{ pdt_console *c;
for(c=consoles; c; c=c->next)
{ if ( c->input_handle == input_handle ||
c->output_handle == output_handle )
return c;
}
if ( (c=malloc(sizeof(*c))) )
{ memset(c, 0, sizeof(*c));
c->input_handle = input_handle;
c->output_handle = output_handle;
c->input_functions = *Suser_input->functions;
c->output_functions = *Suser_output->functions;
c->org_input_functions = Suser_input->functions;
c->org_output_functions = Suser_output->functions;
c->next = consoles;
consoles = c;
}
return c;
}
static Sclose_function
free_console(void *input_handle, void *output_handle)
{ pdt_console **pc;
pdt_console *c;
for(pc = &consoles; (c=*pc); pc = &c->next)
{ Sclose_function cf = NULL;
c = *pc;
if ( input_handle && c->input_handle == input_handle )
{ cf = c->org_input_functions->close;
c->input_handle = NULL;
Suser_input->functions = c->org_input_functions;
} else if ( output_handle && c->output_handle == output_handle )
{ cf = c->org_output_functions->close;
c->output_handle = NULL;
Suser_input->functions = c->org_output_functions;
}
if ( cf )
{ if ( !c->input_handle && !c->output_handle )
{ *pc = c->next;
free(c);
}
return cf;
}
}
return NULL;
}
static ssize_t
pdt_read(void *handle, char *buf, size_t size)
{ pdt_console *c = find_console(handle, NULL);
IOSTREAM *out;
if ( c &&
PL_ttymode(Suser_input) == PL_RAWTTY &&
(out = Suser_output) )
{ ssize_t rc;
static char go_single[] = {ESC, 's'};
if ( (*c->org_output_functions->write)(out->handle, go_single, 2) == 2 )
{ rc = (*c->org_input_functions->read)(handle, buf, 2);
if ( rc == 2 )
rc = 1; /* drop \n */
return rc;
}
}
return (*c->org_input_functions->read)(handle, buf, size);
}
static ssize_t
pdt_write(void *handle, char *buf, size_t size)
{ pdt_console *c = find_console(NULL, handle);
char *e = buf+size;
size_t written = 0;
while(buf < e)
{ char *em;
ssize_t rc;
for(em=buf; *em != ESC && em < e; em++)
;
rc = (*c->org_output_functions->write)(handle, buf, em-buf);
if ( rc < 0 )
return rc;
written += (em-buf);
if ( rc != (em-buf) )
return written;
if ( em != e )
{ static char esc[2] = {ESC,ESC};
if ( (*c->org_output_functions->write)(handle, esc, 2) != 2 )
return -1;
em++;
}
buf = em;
}
return written;
}
static int
pdt_close_in(void *handle)
{ Sclose_function cf = free_console(handle, NULL);
if ( cf )
return (*cf)(handle);
return -1;
}
static int
pdt_close_out(void *handle)
{ Sclose_function cf = free_console(NULL, handle);
if ( cf )
return (*cf)(handle);
return -1;
}
static foreign_t
pdt_wrap_console()
{ IOSTREAM *in, *out;
if ( (in=Suser_input) && (out=Suser_output) )
{ pdt_console *c;
assert(in->functions->read != pdt_read);
assert(out->functions->write != pdt_write);
if ( (c=find_console(in->handle, out->handle)) )
{ in->functions = &c->input_functions;
in->functions->read = pdt_read;
in->functions->close = pdt_close_in;
out->functions = &c->output_functions;
out->functions->write = pdt_write;
out->functions->close = pdt_close_out;
}
}
return TRUE;
}
install_t
install_pdt_console()
{ PL_register_foreign("pdt_wrap_console", 0, pdt_wrap_console, 0);
}
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