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>
int
getchar ()
{
return getc (g_stdin);
}
int
ungetchar (int c)
{
return ungetc (c, g_stdin);
}
int
peekchar ()
{
int c = getchar ();
ungetchar (c);
return c;
}
SCM
getenv_ (SCM s) ///((name . "getenv"))
{
char *p = getenv (string_to_cstring (s));
return p ? MAKE_STRING (cstring_to_list (p)) : cell_f;
}
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 = 1;
if (TYPE (p) == PAIR && TYPE (car (p)) == NUMBER) fd = VALUE (car (p));
FILE *f = fd == 1 ? stdout : stderr;
assert (TYPE (c) == NUMBER || TYPE (c) == CHAR);
fputc (VALUE (c), f);
return c;
}
SCM
stderr_ (SCM x)
{
SCM write;
if (TYPE (x) == STRING)
fprintf (stderr, string_to_cstring (x));
else if ((write = assq_ref_cache (cell_symbol_write, r0)) != cell_undefined)
apply (assq_ref_cache (cell_symbol_display, r0), cons (x, cons (MAKE_NUMBER (2), cell_nil)), r0);
else if (TYPE (x) == SPECIAL || TYPE (x) == STRING || TYPE (x) == SYMBOL)
fprintf (stderr, string_to_cstring (x));
else if (TYPE (x) == NUMBER)
fprintf (stderr, "%d", VALUE (x));
else
fprintf (stderr, "display: undefined\n");
return cell_unspecified;
}
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 ();
}