mes/src/posix.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017 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>
#include <unistd.h>
int
ungetchar (int c)
{
return ungetc (c, g_stdin);
}
int
peekchar ()
{
int c = getchar ();
ungetchar (c);
return c;
}
SCM
peek_byte ()
{
return MAKE_NUMBER (peekchar ());
}
SCM
read_byte ()
{
return MAKE_NUMBER (getchar ());
}
SCM
unread_byte (SCM i)
{
ungetchar (VALUE (i));
return i;
}
SCM
write_byte (SCM x) ///((arity . n))
{
SCM c = car (x);
SCM p = cdr (x);
int fd = g_stdout;
if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER && VALUE (CAR (p)) != 1)
fd = VALUE (CAR (p));
char cc = VALUE (c);
write (fd, (char*)&cc, 1);
#if !__MESC__
assert (TYPE (c) == TNUMBER || TYPE (c) == TCHAR);
#endif
return c;
}
char string_to_cstring_buf[1024];
char const*
string_to_cstring (SCM s)
{
//static char buf[1024];
//char *p = buf;
char *p = string_to_cstring_buf;
s = STRING(s);
while (s != cell_nil)
{
*p++ = VALUE (car (s));
s = cdr (s);
}
*p = 0;
//return buf;
return string_to_cstring_buf;
}
SCM
getenv_ (SCM s) ///((name . "getenv"))
{
char *p;
p = getenv (string_to_cstring (s));
return p ? MAKE_STRING (cstring_to_list (p)) : cell_f;
}
SCM
access_p (SCM file_name, SCM mode)
{
return access (string_to_cstring (file_name), VALUE (mode)) == 0 ? cell_t : cell_f;
}
SCM
current_input_port ()
{
return MAKE_NUMBER (g_stdin);
}
SCM
open_input_file (SCM file_name)
{
return MAKE_NUMBER (open (string_to_cstring (file_name), O_RDONLY));
}
SCM
set_current_input_port (SCM port)
{
g_stdin = VALUE (port) ? VALUE (port) : STDIN;
return current_input_port ();
}
SCM
current_output_port ()
{
return MAKE_NUMBER (g_stdout);
}
SCM
open_output_file (SCM x) ///((arity . n))
{
SCM file_name = car (x);
x = cdr (x);
int mode = S_IRUSR|S_IWUSR;
if (TYPE (x) == TPAIR && TYPE (car (x)) == TNUMBER) mode = VALUE (car (x));
return MAKE_NUMBER (open (string_to_cstring (file_name), O_WRONLY|O_CREAT|O_TRUNC,mode));
}
SCM
set_current_output_port (SCM port)
{
g_stdout = VALUE (port) ? VALUE (port) : STDOUT;
return current_output_port ();
}
SCM
force_output (SCM p) ///((arity . n))
{
return cell_unspecified;
}