/* vifm * Copyright (C) 2011 xaizek. * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef VIFM__UTILS__MACROS_H__ #define VIFM__UTILS__MACROS_H__ #include <stddef.h> /* size_t */ /* some useful macros */ /* for portable use of GNUC extensions (see Robert Love's book about system * programming in Linux) */ #if __GNUC__ > 3 #undef inline #define inline inline __attribute__ ((always_inline)) #define _gnuc_noinline __attribute__ ((noinline)) #define _gnuc_pure __attribute__ ((pure)) #define _gnuc_const __attribute__ ((const)) #define _gnuc_noreturn __attribute__ ((noreturn)) #define _gnuc_malloc __attribute__ ((malloc)) #define _gnuc_must_check __attribute__ ((must_check)) #define _gnuc_deprecated __attribute__ ((deprecated)) #define _gnuc_used __attribute__ ((used)) #define _gnuc_unused __attribute__ ((unused)) #define _gnuc_packed __attribute__ ((packed)) #define _gnuc_align(x) __attribute__ ((aligned(x))) #define _gnuc_align_max __attribute__ ((aligned)) #if defined(BROKEN_SWPRINTF) || defined(__clang__) #define _gnuc_printf(m, n) __attribute__ ((format(printf, (m), (n)))); #else #define _gnuc_printf(m, n) __attribute__ ((format(gnu_printf, (m), (n)))); #endif #define _gnuc_likely(x) __builtin_expect (!!(x), 1) #define _gnuc_unlikely(x) __builtin_expect (!!(x), 0) #else #define _gnuc_noinline #define _gnuc_pure #define _gnuc_const #define _gnuc_noreturn #define _gnuc_malloc #define _gnuc_must_check #define _gnuc_deprecated #define _gnuc_used #define _gnuc_unused #define _gnuc_packed #define _gnuc_align(x) #define _gnuc_align_max #define _gnuc_printf(m, n) #define _gnuc_likely(x) (x) #define _gnuc_unlikely(x) (x) #endif #define ARRAY_LEN(x) (sizeof(x)/sizeof((x)[0])) #define ARRAY_GUARD(x, len) \ typedef int x##_array_guard[(ARRAY_LEN(x) == (len)) ? 1 : -1]; \ /* Fake use to suppress "Unused local variable" warning. */ \ enum { x##_array_guard_fake_use = (size_t)(x##_array_guard*)0 } /* Make sure nobody else defined MIN/MAX macros. */ #ifdef MIN #undef MIN #endif #ifdef MAX #undef MAX #endif #define MIN(a,b) ({ \ typeof(a) _a = (a); \ typeof(b) _b = (b); \ (_a < _b) ? _a : _b; \ }) #define MAX(a,b) ({ \ typeof(a) _a = (a); \ typeof(b) _b = (b); \ (_a > _b) ? _a : _b; \ }) #define DIV_ROUND_UP(a,b) ({ \ typeof(a) _a = (a); \ typeof(b) _b = (b); \ (_a + (_b - 1))/_b; \ }) #define ROUND_DOWN(a,b) ({ \ typeof(a) _a = (a); \ typeof(b) _b = (b); \ _a - _a%_b; \ }) /* Compares parameters to produce result that's less than, equal or greater than * zero that reflects the same relation between the parameters while avoiding * overflows. Returns a signed int. */ #define SORT_CMP(a,b) ({ \ const typeof(a) _a = (a); \ const typeof(b) _b = (b); \ (_a < _b) ? -1 : (_a > _b); \ }) /* Maps single-bit mask onto bit number, e.g. BIT(8) == 3. */ #define BIT(x) ((x) == 1U << 0 ? 0 : (x) == 1U << 1 ? 1 : \ (x) == 1U << 2 ? 2 : (x) == 1U << 3 ? 3 : \ (x) == 1U << 4 ? 4 : (x) == 1U << 5 ? 5 : \ (x) == 1U << 6 ? 6 : (x) == 1U << 7 ? 7 : \ (x) == 1U << 8 ? 8 : (x) == 1U << 9 ? 9 : \ (x) == 1U << 10 ? 10 : (x) == 1U << 11 ? 11 : \ (x) == 1U << 12 ? 12 : (x) == 1U << 13 ? 13 : \ (x) == 1U << 14 ? 14 : (x) == 1U << 15 ? 15 : \ (x) == 1U << 16 ? 16 : (x) == 1U << 17 ? 17 : \ (x) == 1U << 18 ? 18 : (x) == 1U << 19 ? 19 : \ (x) == 1U << 20 ? 20 : (x) == 1U << 21 ? 21 : \ (x) == 1U << 22 ? 22 : (x) == 1U << 23 ? 23 : \ (x) == 1U << 24 ? 24 : (x) == 1U << 25 ? 25 : \ (x) == 1U << 26 ? 26 : (x) == 1U << 27 ? 27 : \ (x) == 1U << 28 ? 28 : (x) == 1U << 29 ? 29 : \ (x) == 1U << 30 ? 30 : (x) == 1U << 31 ? 31 : \ -1) /* Evaluates to "true" if all expressions are true. Examples: * ALL(isdigit, '1', '9') == 1 * ALL(isdigit, 'z', '9') == 0 */ #define ALL(f, ...) ALL_(f, COUNT(__VA_ARGS__), __VA_ARGS__) #define ALL_(f, n, ...) ALL__(f, n, __VA_ARGS__) #define ALL__(f, n, ...) comb##n((f), !!, &&, __VA_ARGS__) /* Evaluates to "true" if any of expressions is true. Examples: * ANY(isdigit, 'z', '9') == 1 * ANY(isdigit, 'z', 'a') == 0 */ #define ANY(f, ...) ({ ANY_(f, COUNT(__VA_ARGS__), __VA_ARGS__); }) #define ANY_(f, n, ...) ANY__(f, n, __VA_ARGS__) #define ANY__(f, n, ...) comb##n((f), !!, ||, __VA_ARGS__) /* Evaluates to "true" if none of expressions is true. Examples: * NONE(isdigit, 'z', 'a') == 1 * NONE(isdigit, '1', '9') == 0 */ #define NONE(f, ...) ({ NONE_(f, COUNT(__VA_ARGS__), __VA_ARGS__); }) #define NONE_(f, n, ...) NONE__(f, n, __VA_ARGS__) #define NONE__(f, n, ...) comb##n((f), !, &&, __VA_ARGS__) /* Checks whether v equals to any of the rest of arguments. Examples: * ONE_OF(1, 1, 2) == 1 * ONE_OF(1, 0, 2) == 0 */ #define ONE_OF(v, ...) ({ ONE_OF_(v, COUNT(__VA_ARGS__), __VA_ARGS__); }) #define ONE_OF_(v, n, ...) ONE_OF__(v, n, __VA_ARGS__) #define ONE_OF__(v, n, ...) comb##n((v) == , , ||, __VA_ARGS__) /* Makes bit mask from a list of bits. */ #define MASK(...) MASK_(COUNT(__VA_ARGS__), __VA_ARGS__) #define MASK_(n, ...) MASK__(n, __VA_ARGS__) #define MASK__(n, ...) comb##n(<<, 1, |, __VA_ARGS__) /* Neat trick to obtain number number of variadic arguments. */ #define COUNT(...) COUNT_(__VA_ARGS__, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) #define COUNT_(_1, _2, _3, _4, _5, _6, _7, _8, _9, n, ...) n /* Helper macros to process variable arguments of macros. */ #define comb9(f, n, op, val, ...) (n f(val) op comb8(f, n, op, __VA_ARGS__)) #define comb8(f, n, op, val, ...) (n f(val) op comb7(f, n, op, __VA_ARGS__)) #define comb7(f, n, op, val, ...) (n f(val) op comb6(f, n, op, __VA_ARGS__)) #define comb6(f, n, op, val, ...) (n f(val) op comb5(f, n, op, __VA_ARGS__)) #define comb5(f, n, op, val, ...) (n f(val) op comb4(f, n, op, __VA_ARGS__)) #define comb4(f, n, op, val, ...) (n f(val) op comb3(f, n, op, __VA_ARGS__)) #define comb3(f, n, op, val, ...) (n f(val) op comb2(f, n, op, __VA_ARGS__)) #define comb2(f, n, op, val, ...) (n f(val) op comb1(f, n, op, __VA_ARGS__)) #define comb1(f, n, op, val) (n f(val)) #endif /* VIFM__UTILS__MACROS_H__ */ /* vim: set tabstop=2 softtabstop=2 shiftwidth=2 noexpandtab cinoptions-=(0 : */ /* vim: set cinoptions+=t0 filetype=c : */