55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <limits.h>
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#include <sys/resource.h>
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int __ungetc_buf[RLIMIT_NOFILE + 1] = { 0 };
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void
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__ungetc_init ()
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{
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if (__ungetc_buf[RLIMIT_NOFILE] == 0)
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memset (__ungetc_buf, -1, (RLIMIT_NOFILE + 1) * sizeof (int));
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}
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int
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fdgetc (int fd)
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{
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__ungetc_init ();
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char c;
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int i = __ungetc_buf[fd];
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if (i >= 0)
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__ungetc_buf[fd] = -1;
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else
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{
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int r = read (fd, &c, 1);
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if (r < 1)
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return -1;
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i = c;
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}
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if (i < 0)
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i += 256;
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return i;
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}
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