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Diffstat (limited to 'apt-pkg/contrib/macros.h')
| -rw-r--r-- | apt-pkg/contrib/macros.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/apt-pkg/contrib/macros.h b/apt-pkg/contrib/macros.h new file mode 100644 index 000000000..9aeb77b81 --- /dev/null +++ b/apt-pkg/contrib/macros.h @@ -0,0 +1,88 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + Macros Header - Various useful macro definitions + + This source is placed in the Public Domain, do with it what you will + It was originally written by Brian C. White. + + ##################################################################### */ + /*}}}*/ +// Private header +#ifndef MACROS_H +#define MACROS_H + +// MIN_VAL(SINT16) will return -0x8000 and MAX_VAL(SINT16) = 0x7FFF +#define MIN_VAL(t) (((t)(-1) > 0) ? (t)( 0) : (t)(((1L<<(sizeof(t)*8-1)) ))) +#define MAX_VAL(t) (((t)(-1) > 0) ? (t)(-1) : (t)(((1L<<(sizeof(t)*8-1))-1))) + +// Min/Max functions +#if !defined(MIN) +#if defined(__HIGHC__) +#define MIN(x,y) _min(x,y) +#define MAX(x,y) _max(x,y) +#endif + +// GNU C++ has a min/max operator <coolio> +#if defined(__GNUG__) +#define MIN(A,B) ((A) <? (B)) +#define MAX(A,B) ((A) >? (B)) +#endif + +/* Templates tend to mess up existing code that uses min/max because of the + strict matching requirements */ +#if !defined(MIN) +#define MIN(A,B) ((A) < (B)?(A):(B)) +#define MAX(A,B) ((A) > (B)?(A):(B)) +#endif +#endif + +/* Bound functions, bound will return the value b within the limits a-c + bounv will change b so that it is within the limits of a-c. */ +#define _bound(a,b,c) MIN(c,MAX(b,a)) +#define _boundv(a,b,c) b = _bound(a,b,c) +#define ABS(a) (((a) < (0)) ?-(a) : (a)) + +/* Usefull count macro, use on an array of things and it will return the + number of items in the array */ +#define _count(a) (sizeof(a)/sizeof(a[0])) + +// Flag Macros +#define FLAG(f) (1L << (f)) +#define SETFLAG(v,f) ((v) |= FLAG(f)) +#define CLRFLAG(v,f) ((v) &=~FLAG(f)) +#define CHKFLAG(v,f) ((v) & FLAG(f) ? true : false) + +// some nice optional GNUC features +#if __GNUC__ >= 3 + #define __must_check __attribute__ ((warn_unused_result)) + #define __deprecated __attribute__ ((deprecated)) + /* likely() and unlikely() can be used to mark boolean expressions + as (not) likely true which will help the compiler to optimise */ + #define likely(x) __builtin_expect (!!(x), 1) + #define unlikely(x) __builtin_expect (!!(x), 0) +#else + #define __must_check /* no warn_unused_result */ + #define __deprecated /* no deprecated */ + #define likely(x) (x) + #define unlikely(x) (x) +#endif + +// cold functions are unlikely() to be called +#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4 + #define __cold __attribute__ ((__cold__)) +#else + #define __cold /* no cold marker */ +#endif + +#ifdef __GNUG__ +// Methods have a hidden this parameter that is visible to this attribute + #define __like_printf_1 __attribute__ ((format (printf, 2, 3))) + #define __like_printf_2 __attribute__ ((format (printf, 3, 4))) +#else + #define __like_printf_1 + #define __like_printf_2 +#endif + +#endif |