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mes/src/posix.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU 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.
*
* GNU 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mes/lib.h"
#include "mes/mes.h"
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
int
peekchar ()
{
if (__stdin >= 0)
{
int c = readchar ();
unreadchar (c);
return c;
}
SCM port = current_input_port ();
SCM string = STRING (port);
size_t length = LENGTH (string);
if (length == 0)
return -1;
char const *p = cell_bytes (STRING (string));
return p[0];
}
int
readchar ()
{
if (__stdin >= 0)
return fdgetc (__stdin);
SCM port = current_input_port ();
SCM string = STRING (port);
size_t length = LENGTH (string);
if (length == 0)
return -1;
char const *p = cell_bytes (STRING (string));
int c = p[0];
p = p + 1;
STRING (port) = make_string (p, length - 1);
return c;
}
int
unreadchar (int c)
{
if (__stdin >= 0)
return fdungetc (c, __stdin);
if (c == EOF) /* can't unread EOF */
return c;
SCM port = current_input_port ();
SCM string = STRING (port);
size_t length = LENGTH (string);
char *p = cell_bytes (STRING (string));
p = p - 1;
string = make_string (p, length + 1);
p = cell_bytes (STRING (string));
p[0] = c;
STRING (port) = string;
return c;
}
SCM
peek_byte ()
{
return make_number (peekchar ());
}
SCM
read_byte ()
{
return make_number (readchar ());
}
SCM
unread_byte (SCM i)
{
unreadchar (VALUE (i));
return i;
}
SCM
peek_char ()
{
return make_char (peekchar ());
}
SCM
read_char (SCM port) /*:((arity . n)) */
{
int fd = __stdin;
if (TYPE (port) == TPAIR)
if (TYPE (CAR (port)) == TNUMBER)
__stdin = VALUE (CAR (port));
SCM c = make_char (readchar ());
__stdin = fd;
return c;
}
SCM
unread_char (SCM i)
{
unreadchar (VALUE (i));
return i;
}
SCM
write_char (SCM i) /*:((arity . n)) */
{
write_byte (i);
return i;
}
SCM
write_byte (SCM x) /*:((arity . n)) */
{
SCM c = car (x);
SCM p = cdr (x);
int fd = __stdout;
if (TYPE (p) == TPAIR)
{
SCM f = CAR (p);
if (TYPE (f) == TNUMBER)
{
long v = VALUE (f);
if (v != 1)
fd = v;
if (v == 2)
fd = __stderr;
}
}
char cc = VALUE (c);
write (fd, &cc, 1);
#if !__MESC__
assert_msg (TYPE (c) == TNUMBER || TYPE (c) == TCHAR, "TYPE (c) == TNUMBER || TYPE (c) == TCHAR");
#endif
return c;
}
SCM
getenv_ (SCM s) /*:((name . "getenv")) */
{
char *p;
p = getenv (cell_bytes (STRING (s)));
if (p != 0)
return make_string0 (p);
return cell_f;
}
SCM
setenv_ (SCM s, SCM v) /*:((name . "setenv")) */
{
char *buf = __setenv_buf;
strcpy (buf, cell_bytes (STRING (s)));
setenv (buf, cell_bytes (STRING (v)), 1);
return cell_unspecified;
}
SCM
access_p (SCM file_name, SCM mode)
{
if (access (cell_bytes (STRING (file_name)), VALUE (mode)) == 0)
return cell_t;
return cell_f;
}
SCM
current_input_port ()
{
if (__stdin >= 0)
return make_number (__stdin);
SCM x = g_ports;
while (x)
{
SCM a = CAR (x);
if (PORT (a) == __stdin)
return a;
x = CDR (x);
}
return CAR (x);
}
SCM
open_input_file (SCM file_name)
{
int filedes = mes_open (cell_bytes (STRING (file_name)), O_RDONLY, 0);
if (filedes == -1)
error (cell_symbol_system_error, cons (make_string0 ("No such file or directory"), file_name));
return make_number (filedes);
}
SCM
open_input_string (SCM string)
{
SCM port = make_string_port (string);
g_ports = cons (port, g_ports);
return port;
}
SCM
set_current_input_port (SCM port)
{
SCM prev = current_input_port ();
if (TYPE (port) == TNUMBER)
{
int p = VALUE (port);
if (p != 0)
__stdin = p;
else
__stdin = STDIN;
}
else if (TYPE (port) == TPORT)
__stdin = PORT (port);
return prev;
}
SCM
current_output_port ()
{
return make_number (__stdout);
}
SCM
current_error_port ()
{
return make_number (__stderr);
}
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)
{
SCM i = car (x);
if (TYPE (i) == TNUMBER)
mode = VALUE (i);
}
return make_number (mes_open (cell_bytes (STRING (file_name)), O_WRONLY | O_CREAT | O_TRUNC, mode));
}
SCM
set_current_output_port (SCM port)
{
if (VALUE (port) != 0)
__stdout = VALUE (port);
else
__stdout = STDOUT;
return current_output_port ();
}
SCM
set_current_error_port (SCM port)
{
if (VALUE (port) != 0)
__stderr = VALUE (port);
else
__stderr = STDERR;
return current_error_port ();
}
SCM
chmod_ (SCM file_name, SCM mode) /*:((name . "chmod")) */
{
chmod (cell_bytes (STRING (file_name)), VALUE (mode));
return cell_unspecified;
}
SCM
isatty_p (SCM port)
{
if (isatty (VALUE (port)) != 0)
return cell_t;
return cell_f;
}
SCM
primitive_fork ()
{
return make_number (fork ());
}
SCM
execl_ (SCM file_name, SCM args) /*:((name . "execl")) */
{
char **c_argv = __execl_c_argv;
int i = 0;
if (length__ (args) > 1000)
error (cell_symbol_system_error,
cons (file_name, cons (make_string0 ("too many arguments"), cons (file_name, args))));
c_argv[i] = cell_bytes (STRING (file_name));
i = i + 1;
while (args != cell_nil)
{
assert_msg (TYPE (CAR (args)) == TSTRING, "TYPE (CAR (args)) == TSTRING");
SCM arg = CAR (args);
c_argv[i] = cell_bytes (STRING (arg));
i = i + 1;
args = CDR (args);
if (g_debug > 2)
{
eputs ("arg[");
eputs (itoa (i));
eputs ("]: ");
eputs (c_argv[i - 1]);
eputs ("\n");
}
}
c_argv[i] = 0;
return make_number (execv (c_argv[0], c_argv));
}
SCM
waitpid_ (SCM pid, SCM options)
{
int status;
int child = waitpid (VALUE (pid), &status, VALUE (options));
return cons (make_number (child), make_number (status));
}
#if __x86_64__
/* Nanoseconds on 64-bit systems with POSIX timers. */
#define TIME_UNITS_PER_SECOND 1000000000
#else
/* Milliseconds for everyone else. */
#define TIME_UNITS_PER_SECOND 1000
#endif
#if __M2_PLANET
struct timespec
{
long tv_sec;
long tv_nsec;
};
struct timeval
{
long tv_sec;
long tv_usec;
};
#endif
struct timespec g_start_time;
SCM
init_time (SCM a) /*:((internal)) */
{
clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &g_start_time);
a = acons (cell_symbol_internal_time_units_per_second, make_number (TIME_UNITS_PER_SECOND), a);
}
SCM
current_time ()
{
return make_number (time (0));
}
SCM
gettimeofday_ () /*:((name . "gettimeofday")) */
{
#if __M2_PLANET__
return make_number (0);
#else
struct timeval time;
gettimeofday (&time, 0);
return cons (make_number (time.tv_sec), make_number (time.tv_usec));
#endif
}
long
seconds_and_nanoseconds_to_long (long s, long ns)
{
return s * TIME_UNITS_PER_SECOND + ns / (1000000000 / TIME_UNITS_PER_SECOND);
}
SCM
get_internal_run_time ()
{
#if __M2_PLANET__
return make_number (0);
#else
struct timespec ts;
clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts);
long time = seconds_and_nanoseconds_to_long (ts.tv_sec - g_start_time.tv_sec,
ts.tv_nsec - g_start_time.tv_nsec);
return make_number (time);
#endif
}
SCM
getcwd_ () /*:((name . "getcwd")) */
{
char *buf = __getcwd_buf;
return make_string0 (getcwd (buf, PATH_MAX));
}
SCM
dup_ (SCM port) /*:((name . "dup")) */
{
return make_number (dup (VALUE (port)));
}
SCM
dup2_ (SCM old, SCM new) /*:((name . "dup2")) */
{
dup2 (VALUE (old), VALUE (new));
return cell_unspecified;
}
SCM
delete_file (SCM file_name)
{
unlink (cell_bytes (STRING (file_name)));
return cell_unspecified;
}
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