防止头文件被重复包含
#ifndef CONDEF_H
#define CONDEF_H/* 头文件内容 */#endif
重新定义数据类型，防止由于各种平台和编译器的不同而产生的类型字节数差异，方便移植
typedef unsigned char boolean; /* Boolean value type. */
typedef unsigned long int uint32; /* Unsigned 32 bit value */
typedef unsigned short uint16; /* Unsigned 16 bit value */
typedef unsigned char uint8; /* Unsigned 8 bit value */
typedef signed long int int32; /* Signed 32 bit value */
typedef signed short int16; /* Signed 16 bit value */
typedef signed char int8; /* Signed 8 bit value */
得到指定地址的一个字节或字
#define MEM_B( x ) ( *( (byte *) (x) ) )
#define MEM_W( x ) ( *( (word *) (x) ) )
求最大值和最小值
#define MAX( x, y ) ( ((x) > (y)) ? (x) : (y) )
#define MIN( x, y ) ( ((x) < (y)) ? (x) : (y) )
将一个小写字母转换为大写字母
#define UPCASE( c ) ( ((c) >= 'a' && (c) <= 'z') ? ((c) - 0x20) : (c) )
返回数组元素的个数
#define ARR_SIZE( a ) ( sizeof( (a) ) / sizeof( (a[0]) ) )
