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1 // -*- mode: cpp; mode: fold -*-
2 // Description /*{{{*/
3 // $Id: system.h,v 1.1 1998/07/02 02:58:13 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 // Header section: /
15 #ifndef SYSTEM_H
16 #define SYSTEM_H
17
18 // MIN_VAL(SINT16) will return -0x8000 and MAX_VAL(SINT16) = 0x7FFF
19 #define MIN_VAL(t) (((t)(-1) > 0) ? (t)( 0) : (t)(((1L<<(sizeof(t)*8-1)) )))
20 #define MAX_VAL(t) (((t)(-1) > 0) ? (t)(-1) : (t)(((1L<<(sizeof(t)*8-1))-1)))
21
22 // Min/Max functions
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
41 /* Bound functions, bound will return the value b within the limits a-c
42 bounv will change b so that it is within the limits of a-c. */
43 #define _bound(a,b,c) MIN(c,MAX(b,a))
44 #define _boundv(a,b,c) b = _bound(a,b,c)
45 #define ABS(a) (((a) < (0)) ?-(a) : (a))
46
47 /* Usefull count macro, use on an array of things and it will return the
48 number of items in the array */
49 #define _count(a) (sizeof(a)/sizeof(a[0]))
50
51 // Flag Macros
52 #define FLAG(f) (1L << (f))
53 #define SETFLAG(v,f) ((v) |= FLAG(f))
54 #define CLRFLAG(v,f) ((v) &=~FLAG(f))
55 #define CHKFLAG(v,f) ((v) & FLAG(f) ? true : false)
56
57 #endif