89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/* -*-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 <errno.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/resource.h>
|
|
#include <unistd.h>
|
|
|
|
int *__ungetc_buf;
|
|
|
|
int
|
|
__ungetc_p (int filedes)
|
|
{
|
|
if (__ungetc_buf == 0)
|
|
__ungetc_init ();
|
|
return __ungetc_buf[filedes] >= 0;
|
|
}
|
|
|
|
void
|
|
__ungetc_init ()
|
|
{
|
|
if (__ungetc_buf == 0)
|
|
{
|
|
int save_errno = errno;
|
|
__ungetc_buf = malloc ((__FILEDES_MAX + 1) * sizeof (int));
|
|
errno = save_errno;
|
|
memset (__ungetc_buf, -1, (__FILEDES_MAX + 1) * sizeof (int));
|
|
}
|
|
}
|
|
|
|
void
|
|
__ungetc_clear (int filedes)
|
|
{
|
|
if (__ungetc_buf == 0)
|
|
__ungetc_init ();
|
|
__ungetc_buf[filedes] = -1;
|
|
}
|
|
|
|
void
|
|
__ungetc_set (int filedes, int c)
|
|
{
|
|
if (__ungetc_buf == 0)
|
|
__ungetc_init ();
|
|
__ungetc_buf[filedes] = c;
|
|
}
|
|
|
|
int
|
|
fdgetc (int fd)
|
|
{
|
|
if (__ungetc_buf == 0)
|
|
__ungetc_init ();
|
|
|
|
char c;
|
|
int i = __ungetc_buf[fd];
|
|
if (i >= 0)
|
|
__ungetc_buf[fd] = -1;
|
|
else
|
|
{
|
|
int r = read (fd, &c, 1);
|
|
if (r < 1)
|
|
return -1;
|
|
i = c;
|
|
}
|
|
if (i < 0)
|
|
i = i + 256;
|
|
|
|
return i;
|
|
}
|