f077364bce
* src/posix.c (peek_char, read_char, read_string, unread_char, write_char): New function. * src/reader.c: Use reader_ prefix. r# bootstrappable.org
191 lines
3.3 KiB
C
191 lines
3.3 KiB
C
/* -*-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
|
|
peek_char ()
|
|
{
|
|
return MAKE_CHAR (peekchar ());
|
|
}
|
|
|
|
SCM
|
|
read_char ()
|
|
{
|
|
return MAKE_CHAR (getchar ());
|
|
}
|
|
|
|
SCM
|
|
unread_char (SCM i)
|
|
{
|
|
ungetchar (VALUE (i));
|
|
return i;
|
|
}
|
|
|
|
SCM
|
|
write_char (SCM i) ///((arity . n))
|
|
{
|
|
write_byte (i);
|
|
return i;
|
|
}
|
|
|
|
SCM
|
|
read_string ()
|
|
{
|
|
SCM lst = cell_nil;
|
|
SCM c = read_char ();
|
|
while (VALUE (c) != -1)
|
|
{
|
|
lst = append2 (lst, cons (c, cell_nil));
|
|
c = read_char ();
|
|
}
|
|
return MAKE_STRING (lst);
|
|
}
|
|
|
|
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;
|
|
}
|