mes/posix.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
char const*
string_to_cstring (SCM s)
{
static char buf[1024];
char *p = buf;
s = STRING (s);
while (s != cell_nil)
{
*p++ = VALUE (car (s));
s = cdr (s);
}
*p = 0;
return buf;
}
SCM
force_output (SCM p) ///((arity . n))
{
int fd = 1;
if (TYPE (p) == PAIR && TYPE (car (p)) == NUMBER) fd = VALUE (car (p));
FILE *f = fd == 1 ? stdout : stderr;
fflush (f);
return cell_unspecified;
}
SCM
open_input_file (SCM file_name)
{
return MAKE_NUMBER (open (string_to_cstring (file_name), O_RDONLY));
}
SCM
current_input_port ()
{
return MAKE_NUMBER (fileno (g_stdin));
}
SCM
set_current_input_port (SCM port)
{
g_stdin = VALUE (port) ? fdopen (VALUE (port), "r") : stdin;
return current_input_port ();
}