1 /* A GNU-like <limits.h>. 2 3 Copyright 2016-2017 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or 6 modify it under the terms of the GNU General Public License 7 as published by the Free Software Foundation; either version 3, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, see <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _@GUARD_PREFIX@_LIMITS_H 19 20 #if __GNUC__ >= 3 21 @PRAGMA_SYSTEM_HEADER@ 22 #endif 23 @PRAGMA_COLUMNS@ 24 25 /* The include_next requires a split double-inclusion guard. */ 26 #@INCLUDE_NEXT@ @NEXT_LIMITS_H@ 27 28 #ifndef _@GUARD_PREFIX@_LIMITS_H 29 #define _@GUARD_PREFIX@_LIMITS_H 30 31 /* The number of usable bits in an unsigned or signed integer type 32 with minimum value MIN and maximum value MAX, as an int expression 33 suitable in #if. Cover all known practical hosts. This 34 implementation exploits the fact that MAX is 1 less than a power of 35 2, and merely counts the number of 1 bits in MAX; "COBn" means 36 "count the number of 1 bits in the low-order n bits"). */ 37 #define _GL_INTEGER_WIDTH(min, max) (((min) < 0) + _GL_COB128 (max)) 38 #define _GL_COB128(n) (_GL_COB64 ((n) >> 31 >> 31 >> 2) + _GL_COB64 (n)) 39 #define _GL_COB64(n) (_GL_COB32 ((n) >> 31 >> 1) + _GL_COB32 (n)) 40 #define _GL_COB32(n) (_GL_COB16 ((n) >> 16) + _GL_COB16 (n)) 41 #define _GL_COB16(n) (_GL_COB8 ((n) >> 8) + _GL_COB8 (n)) 42 #define _GL_COB8(n) (_GL_COB4 ((n) >> 4) + _GL_COB4 (n)) 43 #define _GL_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + !!((n) & 1)) 44 45 /* Macros specified by ISO/IEC TS 18661-1:2014. */ 46 47 #if (! defined ULLONG_WIDTH \ 48 && (defined _GNU_SOURCE || defined __STDC_WANT_IEC_60559_BFP_EXT__)) 49 # define CHAR_WIDTH _GL_INTEGER_WIDTH (CHAR_MIN, CHAR_MAX) 50 # define SCHAR_WIDTH _GL_INTEGER_WIDTH (SCHAR_MIN, SCHAR_MAX) 51 # define UCHAR_WIDTH _GL_INTEGER_WIDTH (0, UCHAR_MAX) 52 # define SHRT_WIDTH _GL_INTEGER_WIDTH (SHRT_MIN, SHRT_MAX) 53 # define USHRT_WIDTH _GL_INTEGER_WIDTH (0, USHRT_MAX) 54 # define INT_WIDTH _GL_INTEGER_WIDTH (INT_MIN, INT_MAX) 55 # define UINT_WIDTH _GL_INTEGER_WIDTH (0, UINT_MAX) 56 # define LONG_WIDTH _GL_INTEGER_WIDTH (LONG_MIN, LONG_MAX) 57 # define ULONG_WIDTH _GL_INTEGER_WIDTH (0, ULONG_MAX) 58 # define LLONG_WIDTH _GL_INTEGER_WIDTH (LLONG_MIN, LLONG_MAX) 59 # define ULLONG_WIDTH _GL_INTEGER_WIDTH (0, ULLONG_MAX) 60 #endif /* !ULLONG_WIDTH && (_GNU_SOURCE || __STDC_WANT_IEC_60559_BFP_EXT__) */ 61 62 #endif /* _@GUARD_PREFIX@_LIMITS_H */ 63 #endif /* _@GUARD_PREFIX@_LIMITS_H */ 64