| | 1 | // -*- mode: cpp; mode: fold -*- |
| | 2 | // Description /*{{{*/ |
| | 3 | // $Id: system.h,v 1.3 1999/12/10 23:40:29 jgg Exp $ |
| | 4 | /* ###################################################################### |
| | 5 | |
| | 6 | System Header - Usefull private definitions |
| | 7 | |
| | 8 | This source is placed in the Public Domain, do with it what you will |
| | 9 | It was originally written by Brian C. White. |
| | 10 | |
| | 11 | ##################################################################### */ |
| | 12 | /*}}}*/ |
| | 13 | // Private header |
| | 14 | #ifndef SYSTEM_H |
| | 15 | #define SYSTEM_H |
| | 16 | |
| | 17 | // MIN_VAL(SINT16) will return -0x8000 and MAX_VAL(SINT16) = 0x7FFF |
| | 18 | #define MIN_VAL(t) (((t)(-1) > 0) ? (t)( 0) : (t)(((1L<<(sizeof(t)*8-1)) ))) |
| | 19 | #define MAX_VAL(t) (((t)(-1) > 0) ? (t)(-1) : (t)(((1L<<(sizeof(t)*8-1))-1))) |
| | 20 | |
| | 21 | // Min/Max functions |
| | 22 | #if !defined(MIN) |
| | 23 | #if defined(__HIGHC__) |
| | 24 | #define MIN(x,y) _min(x,y) |
| | 25 | #define MAX(x,y) _max(x,y) |
| | 26 | #endif |
| | 27 | |
| | 28 | // GNU C++ has a min/max operator <coolio> |
| | 29 | #if defined(__GNUG__) |
| | 30 | #define MIN(A,B) ((A) <? (B)) |
| | 31 | #define MAX(A,B) ((A) >? (B)) |
| | 32 | #endif |
| | 33 | |
| | 34 | /* Templates tend to mess up existing code that uses min/max because of the |
| | 35 | strict matching requirements */ |
| | 36 | #if !defined(MIN) |
| | 37 | #define MIN(A,B) ((A) < (B)?(A):(B)) |
| | 38 | #define MAX(A,B) ((A) > (B)?(A):(B)) |
| | 39 | #endif |
| | 40 | #endif |
| | 41 | |
| | 42 | /* Bound functions, bound will return the value b within the limits a-c |
| | 43 | bounv will change b so that it is within the limits of a-c. */ |
| | 44 | #define _bound(a,b,c) MIN(c,MAX(b,a)) |
| | 45 | #define _boundv(a,b,c) b = _bound(a,b,c) |
| | 46 | #define ABS(a) (((a) < (0)) ?-(a) : (a)) |
| | 47 | |
| | 48 | /* Usefull count macro, use on an array of things and it will return the |
| | 49 | number of items in the array */ |
| | 50 | #define _count(a) (sizeof(a)/sizeof(a[0])) |
| | 51 | |
| | 52 | // Flag Macros |
| | 53 | #define FLAG(f) (1L << (f)) |
| | 54 | #define SETFLAG(v,f) ((v) |= FLAG(f)) |
| | 55 | #define CLRFLAG(v,f) ((v) &=~FLAG(f)) |
| | 56 | #define CHKFLAG(v,f) ((v) & FLAG(f) ? true : false) |
| | 57 | |
| | 58 | #endif |
projects / apt.git / blame_incremental