2209b5728d
* posix.c (write_byte, force_output)[_POSIX_SOURCE]: Use FILE* functions. Fixes repl.mes.
182 lines
3.1 KiB
C
182 lines
3.1 KiB
C
/* -*-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/>.
|
|
*/
|
|
|
|
#if 0
|
|
#include <fcntl.h>
|
|
FILE *g_stdin;
|
|
#else
|
|
|
|
#if _POSIX_SOURCE
|
|
int open (char const *s, int mode);
|
|
int read (int fd, void* buf, size_t n);
|
|
void write (int fd, char const* s, int n);
|
|
#endif
|
|
|
|
int g_stdin;
|
|
|
|
#define O_RDONLY 0
|
|
#define STDIN 0
|
|
#define STDOUT 1
|
|
#define STDERR 2
|
|
|
|
int
|
|
putchar (int c)
|
|
{
|
|
write (STDOUT, (char*)&c, 1);
|
|
return 0;
|
|
}
|
|
|
|
int ungetc_char = -1;
|
|
char ungetc_buf[2];
|
|
|
|
int
|
|
getchar ()
|
|
{
|
|
char c;
|
|
int i;
|
|
if (ungetc_char == -1)
|
|
{
|
|
int r = read (g_stdin, &c, 1);
|
|
if (r < 1) return -1;
|
|
i = c;
|
|
}
|
|
else
|
|
i = ungetc_buf[ungetc_char--];
|
|
|
|
if (i < 0) i += 256;
|
|
|
|
return i;
|
|
}
|
|
|
|
int
|
|
fd_ungetc (int c, int fd)
|
|
{
|
|
assert (ungetc_char < 2);
|
|
ungetc_buf[++ungetc_char] = c;
|
|
return c;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
ungetchar (int c)
|
|
{
|
|
return fd_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
|
|
write_byte (SCM x) ///((arity . n))
|
|
{
|
|
SCM c = car (x);
|
|
SCM p = cdr (x);
|
|
int fd = 1;
|
|
if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER) fd = VALUE (car (p));
|
|
#if _POSIX_SOURCE
|
|
FILE *f = fd == 1 ? stdout : stderr;
|
|
fputc (VALUE (c), f);
|
|
#else
|
|
char cc = VALUE (c);
|
|
write (1, (char*)&cc, fd);
|
|
#endif
|
|
#if __GNUC__
|
|
assert (TYPE (c) == TNUMBER || TYPE (c) == TCHAR);
|
|
#endif
|
|
return c;
|
|
}
|
|
|
|
char const*
|
|
string_to_cstring (SCM s)
|
|
{
|
|
static char buf[1024];
|
|
char *p = buf;
|
|
s = STRING(s);
|
|
while (s != cell_nil)
|
|
{
|
|
*p++ = VALUE (car (s));
|
|
s = cdr (s);
|
|
}
|
|
*p = 0;
|
|
return buf;
|
|
}
|
|
|
|
SCM
|
|
getenv_ (SCM s) ///((name . "getenv"))
|
|
{
|
|
char *p = getenv (string_to_cstring (s));
|
|
return p ? MAKE_STRING (cstring_to_list (p)) : cell_f;
|
|
}
|
|
|
|
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 (g_stdin);
|
|
}
|
|
|
|
SCM
|
|
set_current_input_port (SCM port)
|
|
{
|
|
g_stdin = VALUE (port);
|
|
return current_input_port ();
|
|
}
|
|
|
|
SCM
|
|
force_output (SCM p) ///((arity . n))
|
|
{
|
|
int fd = 1;
|
|
if (TYPE (p) == TPAIR && TYPE (car (p)) == TNUMBER) fd = VALUE (car (p));
|
|
#if _POSIX_SOURCE
|
|
FILE *f = fd == 1 ? stdout : stderr;
|
|
fflush (f);
|
|
#endif
|
|
return cell_unspecified;
|
|
}
|