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/* typemax.h -- encapsulate max values for long, long long, etc. */
/* Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* NOTE: This should be included after config.h, limits.h, stdint.h, and
* inttypes.h
*/
#ifndef _SH_TYPEMAX_H
#define _SH_TYPEMAX_H
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
/* Nonzero if the integer type T is signed. */
#ifndef TYPE_SIGNED
# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
#endif
#ifndef TYPE_SIGNED_MAGNITUDE
# define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1)
#endif
#ifndef TYPE_WIDTH
# define TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
#endif
#ifndef TYPE_MINIMUM
# define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t))
#endif
#ifndef TYPE_MAXIMUM
# define TYPE_MAXIMUM(t) \
((t) (! TYPE_SIGNED (t) \
? (t) -1 \
: ((((t) 1 << (TYPE_WIDTH (t) - 2)) - 1) * 2 + 1)))
#endif
#ifdef HAVE_LONG_LONG_INT
# ifndef LLONG_MAX
# define LLONG_MAX TYPE_MAXIMUM(long long int)
# define LLONG_MIN TYPE_MINIMUM(long long int)
# endif
# ifndef ULLONG_MAX
# define ULLONG_MAX TYPE_MAXIMUM(unsigned long long int)
# endif
#endif
#ifndef ULONG_MAX
# define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
#endif
#ifndef LONG_MAX
# define LONG_MAX ((long int) (ULONG_MAX >> 1))
# define LONG_MIN ((long int) (-LONG_MAX - 1L))
#endif
#ifndef INT_MAX /* ouch */
# define INT_MAX TYPE_MAXIMUM(int)
# define INT_MIN TYPE_MINIMUM(int)
# define UINT_MAX ((unsigned int) ~(unsigned int)0)
#endif
#ifndef SHRT_MAX
# define SHRT_MAX TYPE_MAXIMUM(short)
# define SHRT_MIN TYPE_MINIMUM(short)
# define USHRT_MAX ((unsigned short) ~(unsigned short)0)
#endif
#ifndef UCHAR_MAX
# define UCHAR_MAX 255
#endif
/* workaround for gcc bug in versions < 2.7 */
#if defined (HAVE_LONG_LONG_INT) && __GNUC__ == 2 && __GNUC_MINOR__ < 7
static const unsigned long long int maxquad = ULLONG_MAX;
# undef ULLONG_MAX
# define ULLONG_MAX maxquad
#endif
#if !defined (INTMAX_MAX) || !defined (INTMAX_MIN)
#if SIZEOF_INTMAX_T == SIZEOF_LONG_LONG
# define INTMAX_MAX LLONG_MAX
# define INTMAX_MIN LLONG_MIN
#elif SIZEOF_INTMAX_T == SIZEOF_LONG
# define INTMAX_MAX LONG_MAX
# define INTMAX_MIN LONG_MIN
#else
# define INTMAX_MAX INT_MAX
# define INTMAX_MIN INT_MIN
#endif
#endif
#ifndef SSIZE_MAX
# define SSIZE_MAX INT_MAX
#endif
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) ~(size_t)0)
#endif
#ifndef sh_imaxabs
# define sh_imaxabs(x) (((x) >= 0) ? (x) : -(x))
#endif
/* Handle signed arithmetic overflow and underflow. Have to do it this way
to avoid compilers optimizing out simpler overflow checks. */
/* Make sure that a+b does not exceed MAXV or is smaller than MINV (if b < 0).
Assumes that b > 0 if a > 0 and b < 0 if a < 0 */
#define ADDOVERFLOW(a,b,minv,maxv) \
((((a) > 0) && ((b) > ((maxv) - (a)))) || \
(((a) < 0) && ((b) < ((minv) - (a)))))
/* Make sure that a-b is not smaller than MINV or exceeds MAXV (if b < 0).
Assumes that b > 0 if a > 0 and b < 0 if a < 0 */
#define SUBOVERFLOW(a,b,minv,maxv) \
((((b) > 0) && ((a) < ((minv) + (b)))) || \
(((b) < 0) && ((a) > ((maxv) + (b)))))
#endif /* _SH_TYPEMAX_H */
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