✏ EDIT: posix2_lim.h

/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

The GNU C Library 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
   Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/*
 * Never include this file directly; include <limits.h> instead.
 */

#ifndef	_BITS_POSIX2_LIM_H
#define	_BITS_POSIX2_LIM_H	1

/* The maximum `ibase' and `obase' values allowed by the `bc' utility.  */
#define	_POSIX2_BC_BASE_MAX		99

/* The maximum number of elements allowed in an array by the `bc' utility.  */
#define	_POSIX2_BC_DIM_MAX		2048

/* The maximum `scale' value allowed by the `bc' utility.  */
#define	_POSIX2_BC_SCALE_MAX		99

/* The maximum length of a string constant accepted by the `bc' utility.  */
#define	_POSIX2_BC_STRING_MAX		1000

/* The maximum number of weights that can be assigned to an entry of
   the LC_COLLATE `order' keyword in the locale definition file.  */
#define	_POSIX2_COLL_WEIGHTS_MAX	2

/* The maximum number of expressions that can be nested
   within parentheses by the `expr' utility.  */
#define	_POSIX2_EXPR_NEST_MAX		32

/* The maximum length, in bytes, of an input line.  */
#define	_POSIX2_LINE_MAX		2048

/* The maximum number of repeated occurrences of a regular expression
   permitted when using the interval notation `\{M,N\}'.  */
#define	_POSIX2_RE_DUP_MAX		255

/* The maximum number of bytes in a character class name.  We have no
   fixed limit, 2048 is a high number.  */
#define	_POSIX2_CHARCLASS_NAME_MAX	14

/* These values are implementation-specific,
   and may vary within the implementation.
   Their precise values can be obtained from sysconf.  */

#ifndef	BC_BASE_MAX
#define	BC_BASE_MAX		_POSIX2_BC_BASE_MAX
#endif
#ifndef	BC_DIM_MAX
#define	BC_DIM_MAX		_POSIX2_BC_DIM_MAX
#endif
#ifndef	BC_SCALE_MAX
#define	BC_SCALE_MAX		_POSIX2_BC_SCALE_MAX
#endif
#ifndef	BC_STRING_MAX
#define	BC_STRING_MAX		_POSIX2_BC_STRING_MAX
#endif
#ifndef	COLL_WEIGHTS_MAX
#define	COLL_WEIGHTS_MAX	255
#endif
#ifndef	EXPR_NEST_MAX
#define	EXPR_NEST_MAX		_POSIX2_EXPR_NEST_MAX
#endif
#ifndef	LINE_MAX
#define	LINE_MAX		_POSIX2_LINE_MAX
#endif
#ifndef	CHARCLASS_NAME_MAX
#define	CHARCLASS_NAME_MAX	2048
#endif

/* This value is defined like this in regex.h.  */
#define	RE_DUP_MAX (0x7fff)

#endif	/* bits/posix2_lim.h */

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