306 lines
5.9 KiB
C
306 lines
5.9 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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int readchar ();
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int unreadchar ();
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int
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peekchar ()
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{
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if (g_stdin >= 0)
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{
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int c = readchar ();
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unreadchar (c);
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return c;
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}
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SCM port = current_input_port ();
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return VALUE (CAR (STRING (port)));
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}
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int
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readchar ()
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{
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if (g_stdin >= 0)
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return fdgetc (g_stdin);
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SCM port = current_input_port ();
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SCM string = STRING (port);
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if (string == cell_nil)
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return -1;
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int c = VALUE (CAR (string));
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STRING (port) = CDR (string);
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return c;
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}
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int
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unreadchar (int c)
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{
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if (g_stdin >= 0)
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return fdungetc (c, g_stdin);
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SCM port = current_input_port ();
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STRING (port) = cons (MAKE_CHAR (c), STRING (port));
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return c;
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}
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SCM
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peek_byte ()
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{
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return MAKE_NUMBER (peekchar ());
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}
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SCM
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read_byte ()
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{
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return MAKE_NUMBER (readchar ());
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}
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SCM
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unread_byte (SCM i)
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{
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unreadchar (VALUE (i));
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return i;
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}
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SCM
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peek_char ()
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{
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return MAKE_CHAR (peekchar ());
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}
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SCM
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read_char ()
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{
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return MAKE_CHAR (readchar ());
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}
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SCM
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unread_char (SCM i)
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{
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unreadchar (VALUE (i));
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return i;
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}
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SCM
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write_char (SCM i) ///((arity . n))
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{
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write_byte (i);
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return i;
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}
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SCM
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read_string ()
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{
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SCM lst = cell_nil;
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SCM c = read_char ();
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while (VALUE (c) != -1)
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{
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lst = append2 (lst, cons (c, cell_nil));
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c = read_char ();
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}
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return MAKE_STRING (lst);
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}
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SCM
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write_byte (SCM x) ///((arity . n))
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{
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SCM c = car (x);
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SCM p = cdr (x);
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int fd = g_stdout;
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if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER && VALUE (CAR (p)) != 1)
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fd = VALUE (CAR (p));
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char cc = VALUE (c);
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write (fd, (char*)&cc, 1);
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#if !__MESC__
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assert (TYPE (c) == TNUMBER || TYPE (c) == TCHAR);
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#endif
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return c;
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}
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char string_to_cstring_buf[4096];
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char const*
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string_to_cstring_ (SCM s, char *buf)
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{
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char *p = buf;
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s = STRING(s);
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while (s != cell_nil)
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{
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*p++ = VALUE (car (s));
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s = cdr (s);
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}
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*p = 0;
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return buf;
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}
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char const*
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string_to_cstring (SCM s)
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{
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return string_to_cstring_ (s, string_to_cstring_buf);
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}
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SCM
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getenv_ (SCM s) ///((name . "getenv"))
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{
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char *p;
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p = getenv (string_to_cstring (s));
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return p ? MAKE_STRING (cstring_to_list (p)) : cell_f;
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}
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SCM
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setenv_ (SCM s, SCM v) ///((name . "setenv"))
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{
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char buf[1024];
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strcpy (buf, string_to_cstring (s));
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setenv (buf, string_to_cstring (v), 1);
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return cell_unspecified;
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}
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SCM
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access_p (SCM file_name, SCM mode)
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{
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return access (string_to_cstring (file_name), VALUE (mode)) == 0 ? cell_t : cell_f;
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}
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SCM
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current_input_port ()
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{
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if (g_stdin >= 0)
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return MAKE_NUMBER (g_stdin);
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SCM x = g_ports;
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while (x && PORT (CAR (x)) != g_stdin)
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x = CDR (x);
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return CAR (x);
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}
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SCM
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open_input_file (SCM file_name)
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{
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return MAKE_NUMBER (open (string_to_cstring (file_name), O_RDONLY));
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}
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SCM
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open_input_string (SCM string)
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{
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SCM port = MAKE_STRING_PORT (STRING (string));
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g_ports = cons (port, g_ports);
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return port;
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}
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SCM
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set_current_input_port (SCM port)
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{
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SCM prev = current_input_port ();
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if (TYPE (port) == TNUMBER)
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g_stdin = VALUE (port) ? VALUE (port) : STDIN;
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else if (TYPE (port) == TPORT)
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g_stdin = PORT (port);
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return prev;
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}
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SCM
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current_output_port ()
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{
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return MAKE_NUMBER (g_stdout);
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}
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SCM
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open_output_file (SCM x) ///((arity . n))
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{
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SCM file_name = car (x);
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x = cdr (x);
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int mode = S_IRUSR|S_IWUSR;
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if (TYPE (x) == TPAIR && TYPE (car (x)) == TNUMBER)
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mode = VALUE (car (x));
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return MAKE_NUMBER (open (string_to_cstring (file_name), O_WRONLY|O_CREAT|O_TRUNC,mode));
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}
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SCM
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set_current_output_port (SCM port)
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{
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g_stdout = VALUE (port) ? VALUE (port) : STDOUT;
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return current_output_port ();
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}
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SCM
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force_output (SCM p) ///((arity . n))
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{
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return cell_unspecified;
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}
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SCM
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chmod_ (SCM file_name, SCM mode) ///((name . "chmod"))
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{
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chmod (string_to_cstring (file_name), VALUE (mode));
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return cell_unspecified;
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}
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SCM
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isatty_p (SCM port)
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{
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return isatty (VALUE (port)) ? cell_t : cell_f;
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}
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SCM
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primitive_fork ()
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{
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return MAKE_NUMBER (fork ());
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}
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SCM
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execl_ (SCM file_name, SCM args) ///((name . "execl"))
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{
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char *c_argv[1000]; // POSIX minimum 4096
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int i = 0;
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int n = 0;
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if (length__ (args) > 1000)
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error (cell_symbol_system_error,
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cons (file_name,
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cons (MAKE_STRING (cstring_to_list ("too many arguments")),
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cons (file_name, args))));
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c_argv[i++] = (char*)string_to_cstring_ (file_name, string_to_cstring_buf+n);
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n += length__ (STRING (file_name)) + 1;
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while (args != cell_nil)
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{
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assert (TYPE (CAR (args)) == TSTRING);
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c_argv[i++] = (char*)string_to_cstring_ (CAR (args), string_to_cstring_buf+n);
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n += length__ (STRING (CAR (args))) + 1;
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args = CDR (args);
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if (g_debug > 2)
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{
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eputs ("arg["); eputs (itoa (i)); eputs ("]: "); eputs (c_argv[i-1]); eputs ("\n");
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}
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}
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c_argv[i] = 0;
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return MAKE_NUMBER (execv (c_argv[0], c_argv));
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}
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SCM
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waitpid_ (SCM pid, SCM options)
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{
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int status;
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int child = waitpid (VALUE (pid), &status, VALUE (options));
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return cons (MAKE_NUMBER (child), MAKE_NUMBER (status));
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}
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