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Diffstat (limited to 'contrib/ucw/lib.h')
| -rw-r--r-- | contrib/ucw/lib.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/contrib/ucw/lib.h b/contrib/ucw/lib.h new file mode 100644 index 0000000..506f09b --- /dev/null +++ b/contrib/ucw/lib.h @@ -0,0 +1,125 @@ +/* + * The UCW Library -- Miscellaneous Functions + * + * (c) 1997--2014 Martin Mares <mj@ucw.cz> + * (c) 2005--2014 Tomas Valla <tom@ucw.cz> + * (c) 2006 Robert Spalek <robert@ucw.cz> + * (c) 2007 Pavel Charvat <pchar@ucw.cz> + * + * This software may be freely distributed and used according to the terms + * of the GNU Lesser General Public License. + */ + +#ifndef _UCW_LIB_H +#define _UCW_LIB_H + +#include <stdarg.h> +#include <stdbool.h> +#include <stdlib.h> + +#ifdef CONFIG_UCW_CLEAN_ABI +#define assert_failed ucw_assert_failed +#define assert_failed_msg ucw_assert_failed_msg +#define assert_failed_noinfo ucw_assert_failed_noinfo +#define big_alloc ucw_big_alloc +#define big_alloc_zero ucw_big_alloc_zero +#define big_free ucw_big_free +#define die ucw_die +#define log_die_hook ucw_log_die_hook +#define log_file ucw_log_file +#define log_fork ucw_log_fork +#define log_init ucw_log_init +#define log_pid ucw_log_pid +#define log_title ucw_log_title +#define msg ucw_msg +#define page_alloc ucw_page_alloc +#define page_alloc_zero ucw_page_alloc_zero +#define page_free ucw_page_free +#define page_realloc ucw_page_realloc +#define random_max ucw_random_max +#define random_max_u64 ucw_random_max_u64 +#define random_u32 ucw_random_u32 +#define random_u64 ucw_random_u64 +#define vdie ucw_vdie +#define vmsg ucw_vmsg +#define xfree ucw_xfree +#define xmalloc ucw_xmalloc +#define xmalloc_zero ucw_xmalloc_zero +#define xrealloc ucw_xrealloc +#define xstrdup ucw_xstrdup +#endif + +/*** === Macros for handling structures, offsets and alignment ***/ + +#define CHECK_PTR_TYPE(x, type) ((x)-(type)(x) + (type)(x)) /** Check that a pointer @x is of type @type. Fail compilation if not. **/ +#define PTR_TO(s, i) &((s*)0)->i /** Return OFFSETOF() in form of a pointer. **/ +#define OFFSETOF(s, i) ((uint)offsetof(s, i)) /** Offset of item @i from the start of structure @s **/ +#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i))) /** Given a pointer @p to item @i of structure @s, return a pointer to the start of the struct. **/ + +/** Align an integer @s to the nearest higher multiple of @a (which should be a power of two) **/ +#define ALIGN_TO(s, a) (((s)+a-1)&~(a-1)) + +/** Align a pointer @p to the nearest higher multiple of @s. **/ +#define ALIGN_PTR(p, s) ((uintptr_t)(p) % (s) ? (typeof(p))((uintptr_t)(p) + (s) - (uintptr_t)(p) % (s)) : (p)) + +#define UNALIGNED_PART(ptr, type) (((uintptr_t) (ptr)) % sizeof(type)) + +/*** === Other utility macros ***/ + +#define MIN(a,b) (((a)<(b))?(a):(b)) /** Minimum of two numbers **/ +#define MAX(a,b) (((a)>(b))?(a):(b)) /** Maximum of two numbers **/ +#define CLAMP(x,min,max) ({ typeof(x) _t=x; (_t < min) ? min : (_t > max) ? max : _t; }) /** Clip a number @x to interval [@min,@max] **/ +#define ABS(x) ((x) < 0 ? -(x) : (x)) /** Absolute value **/ +#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a))) /** The number of elements of an array **/ +#define STRINGIFY(x) #x /** Convert macro parameter to a string **/ +#define STRINGIFY_EXPANDED(x) STRINGIFY(x) /** Convert an expanded macro parameter to a string **/ +#define GLUE(x,y) x##y /** Glue two tokens together **/ +#define GLUE_(x,y) x##_##y /** Glue two tokens together, separating them by an underscore **/ + +#define COMPARE(x,y) do { if ((x)<(y)) return -1; if ((x)>(y)) return 1; } while(0) /** Numeric comparison function for qsort() **/ +#define REV_COMPARE(x,y) COMPARE(y,x) /** Reverse numeric comparison **/ +#define COMPARE_LT(x,y) do { if ((x)<(y)) return 1; if ((x)>(y)) return 0; } while(0) +#define COMPARE_GT(x,y) COMPARE_LT(y,x) + +#define ROL(x, bits) (((x) << (bits)) | ((uint)(x) >> (sizeof(uint)*8 - (bits)))) /** Bitwise rotation of an unsigned int to the left **/ +#define ROR(x, bits) (((uint)(x) >> (bits)) | ((x) << (sizeof(uint)*8 - (bits)))) /** Bitwise rotation of an unsigned int to the right **/ + +/*** === Shortcuts for GCC Extensions ***/ + +#ifdef __GNUC__ + +#include "ccan/compiler/compiler.h" +#define FORMAT_CHECK(x,y,z) __attribute__((format(x,y,z))) /** Checking of printf-like format strings **/ +#define likely(x) __builtin_expect((x),1) /** Use `if (likely(@x))` if @x is almost always true **/ +#define unlikely(x) __builtin_expect((x),0) /** Use `if (unlikely(@x))` to hint that @x is almost always false **/ + +#if __GNUC__ >= 4 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3 +#define ALWAYS_INLINE inline __attribute__((always_inline)) /** Forcibly inline **/ +#define NO_INLINE __attribute__((noinline)) /** Forcibly uninline **/ +#else +#define ALWAYS_INLINE inline +#endif + +#if __GNUC__ >= 4 +#define LIKE_MALLOC __attribute__((malloc)) /** Function returns a "new" pointer **/ +#define SENTINEL_CHECK __attribute__((sentinel)) /** The last argument must be NULL **/ +#else +#define LIKE_MALLOC +#define SENTINEL_CHECK +#endif + +#else +#error This program requires the GNU C compiler. +#endif + +/*** + * [[logging]] + * + * === Basic logging functions (see <<log:,Logging>> and <ucw/log.h> for more) + ***/ + +#define DBG(x, ...) do { } while(0) +#define DBG_SPOT do { } while(0) +#define ASSERT(x) + +#endif |