mes/lib/gcc.c

/* -*-comment-start: "//";comment-end:""-*-
 * Mes --- Maxwell Equations of Software
 * Copyright © 2018 Jan (janneke) 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 <libmes.h>
#include <stdint.h>
#include <time.h>
#include <sys/times.h>
#include <sys/time.h>

FILE *
freopen (char const *file_name, char const *opentype, FILE *stream)
{
  fclose (stream);
  return fopen (file_name, opentype);
}

clock_t
times (struct tms *buffer)
{
  eputs ("times stub\n");
  return 0;
}

unsigned int
sleep (unsigned int seconds)
{
  struct timespec requested_time;
  struct timespec remaining;
  requested_time.tv_sec = seconds;
  requested_time.tv_nsec = 0;
  return nanosleep (&requested_time, &remaining);
}

// gcc-3.2
double
__divdi3 (double a, double b)
{
  eputs ("__divdi3 stub\n");
  return ((int)a / (int)b);
}

double
__moddi3 (double a, double b)
{
  eputs ("__moddi3 stub\n");
  return ((int) a %(int)b);
}

// gcc-3.4
void
unsetenv (char const *name)
{
  int length = strlen (name);
  char **p = environ;
  while (*p)
    {
      if (!strncmp (name, *p, length) && *(*p + length) == '=')
        {
          char **q = p;
          q[0] = q[1];
          while (*q++)
            q[0] = q[1];
        }
      p++;
    }
}

// gcc-3.0
int
atexit (void (*function) (void))
{
  __call_at_exit = function;
}

unsigned int
alarm (unsigned int seconds)
{
#if !__MESC__
  struct itimerval old;
  struct itimerval new;
  new.it_interval.tv_usec = 0;
  new.it_interval.tv_sec = 0;
  new.it_value.tv_usec = 0;
  new.it_value.tv_sec = (long int) seconds;
  if (setitimer (ITIMER_REAL, &new, &old) < 0)
    return 0;
  return old.it_value.tv_sec;
#endif
}