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