172 lines
2.9 KiB
C
172 lines
2.9 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* 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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* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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int g_stdin;
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#if _POSIX_SOURCE
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int open (char const *s, int mode);
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int read (int fd, void* buf, size_t n);
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void write (int fd, char const* s, int n);
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#define O_RDONLY 0
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#define STDIN 0
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#define STDOUT 1
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#define STDERR 2
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int
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putchar (int c)
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{
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write (STDOUT, (char*)&c, 1);
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return 0;
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}
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int ungetc_char = -1;
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char ungetc_buf[2];
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int
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getchar ()
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{
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char c;
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int i;
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if (ungetc_char == -1)
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{
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int r = read (g_stdin, &c, 1);
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if (r < 1) return -1;
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i = c;
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}
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else
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i = ungetc_buf[ungetc_char--];
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if (i < 0) i += 256;
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return i;
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}
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#define ungetc fdungetc
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int
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fdungetc (int c, int fd)
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{
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assert (ungetc_char < 2);
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ungetc_buf[++ungetc_char] = c;
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return c;
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}
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#endif
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int
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ungetchar (int c)
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{
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return ungetc (c, g_stdin);
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}
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int
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peekchar ()
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{
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int c = getchar ();
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ungetchar (c);
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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 (getchar ());
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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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ungetchar (VALUE (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 = 1;
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if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER) 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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assert (TYPE (c) == TNUMBER || TYPE (c) == TCHAR);
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return c;
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}
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char string_to_cstring_buf[1024];
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char const*
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string_to_cstring (SCM s)
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{
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//static char buf[1024];
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//char *p = buf;
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char *p = string_to_cstring_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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return 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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#if _POSIX_SOURCE
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char *p = getenv (string_to_cstring (s));
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return p ? MAKE_STRING (cstring_to_list (p)) : cell_f;
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#else
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return cell_t;
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#endif
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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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current_input_port ()
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{
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return MAKE_NUMBER (g_stdin);
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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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g_stdin = VALUE (port) ? VALUE (port) : STDIN;
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return current_input_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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