380 lines
7.6 KiB
C
380 lines
7.6 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 "mes/lib.h"
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#include "mes/mes.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <unistd.h>
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int
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peekchar ()
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{
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if (__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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SCM string = STRING (port);
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size_t length = LENGTH (string);
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if (!length)
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return -1;
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char const *p = CSTRING (string);
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return p[0];
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}
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int
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readchar ()
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{
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if (__stdin >= 0)
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return fdgetc (__stdin);
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SCM port = current_input_port ();
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SCM string = STRING (port);
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size_t length = LENGTH (string);
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if (!length)
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return -1;
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char const *p = CSTRING (string);
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int c = *p++;
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STRING (port) = make_string (p, length - 1);
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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 (__stdin >= 0)
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return fdungetc (c, __stdin);
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SCM port = current_input_port ();
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SCM string = STRING (port);
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size_t length = LENGTH (string);
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char *p = CSTRING (string);
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p--;
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string = make_string (p, length + 1);
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p = CSTRING (string);
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p[0] = c;
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STRING (port) = string;
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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 (SCM port) ///((arity . n))
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{
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int fd = __stdin;
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if (TYPE (port) == TPAIR && TYPE (car (port)) == TNUMBER)
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__stdin = VALUE (CAR (port));
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SCM c = MAKE_CHAR (readchar ());
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__stdin = fd;
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return c;
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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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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 = __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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if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER && VALUE (CAR (p)) == 2)
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fd = __stderr;
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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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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 (CSTRING (s));
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return p ? MAKE_STRING0 (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, CSTRING (s));
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setenv (buf, 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 (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 (__stdin >= 0)
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return MAKE_NUMBER (__stdin);
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SCM x = g_ports;
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while (x && PORT (CAR (x)) != __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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int filedes = mes_open (CSTRING (file_name), O_RDONLY, 0);
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if (filedes == -1)
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error (cell_symbol_system_error, cons (MAKE_STRING0 ("No such file or directory"), file_name));
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return MAKE_NUMBER (filedes);
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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);
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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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__stdin = VALUE (port) ? VALUE (port) : STDIN;
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else if (TYPE (port) == TPORT)
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__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 (__stdout);
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}
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SCM
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current_error_port ()
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{
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return MAKE_NUMBER (__stderr);
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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 (mes_open (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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__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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set_current_error_port (SCM port)
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{
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__stderr = VALUE (port) ? VALUE (port) : STDERR;
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return current_error_port ();
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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 (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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if (length__ (args) > 1000)
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error (cell_symbol_system_error,
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cons (file_name, cons (MAKE_STRING0 ("too many arguments"), cons (file_name, args))));
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c_argv[i++] = CSTRING (file_name);
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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++] = CSTRING (CAR (args));
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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[");
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eputs (itoa (i));
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eputs ("]: ");
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eputs (c_argv[i - 1]);
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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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#if __x86_64__
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/* Nanoseconds on 64-bit systems with POSIX timers. */
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#define TIME_UNITS_PER_SECOND 1000000000
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#else
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/* Milliseconds for everyone else. */
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#define TIME_UNITS_PER_SECOND 1000
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#endif
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struct timespec g_start_time;
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SCM
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init_time (SCM a) ///((internal))
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{
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clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &g_start_time);
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a = acons (cell_symbol_internal_time_units_per_second, MAKE_NUMBER (TIME_UNITS_PER_SECOND), a);
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}
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SCM
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current_time ()
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{
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return MAKE_NUMBER (time (0));
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}
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SCM
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gettimeofday_ () ///((name . "gettimeofday"))
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{
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struct timeval time;
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gettimeofday (&time, 0);
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return cons (MAKE_NUMBER (time.tv_sec), MAKE_NUMBER (time.tv_usec));
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}
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long
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seconds_and_nanoseconds_to_long (long s, long ns)
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{
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return s * TIME_UNITS_PER_SECOND + ns / (1000000000 / TIME_UNITS_PER_SECOND);
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}
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SCM
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get_internal_run_time ()
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{
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struct timespec ts;
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clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts);
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long time = seconds_and_nanoseconds_to_long (ts.tv_sec - g_start_time.tv_sec,
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ts.tv_nsec - g_start_time.tv_nsec);
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return MAKE_NUMBER (time);
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}
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SCM
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getcwd_ () ///((name . "getcwd"))
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{
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char buf[PATH_MAX];
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return MAKE_STRING0 (getcwd (buf, PATH_MAX));
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}
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SCM
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dup_ (SCM port) ///((name . "dup"))
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{
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return MAKE_NUMBER (dup (VALUE (port)));
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}
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SCM
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dup2_ (SCM old, SCM new) ///((name . "dup2"))
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{
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dup2 (VALUE (old), VALUE (new));
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return cell_unspecified;
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}
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SCM
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delete_file (SCM file_name)
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{
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unlink (CSTRING (file_name));
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return cell_unspecified;
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}
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