1 #ifndef _CTYPE_H

2 #define _CTYPE_H

4 #define _U 0x01 /* upper */ // �ñ��λ��ڴ�д�ַ�[A-Z]��

5 #define _L 0x02 /* lower */ // �ñ��λ��Сд�ַ�[a-z]��

6 #define _D 0x04 /* digit */ // �ñ��λ��[0-9]��

7 #define _C 0x08 /* cntrl */ // �ñ��λ��ڿ��ַ��

8 #define _P 0x10 /* punct */ // �ñ��λ��ڱ��ַ��

9 #define _S 0x20 /* white space (space/lf/tab) */ // �հ��ַ��ո�\t��\n�ȡ�

10 #define _X 0x40 /* hex digit */ // �ñ��λ��ʮ��֡�

11 #define _SP 0x80 /* hard space (0x20) */ // �ñ��λ��ڿո��ַ��0x20��

13 extern unsigned char _ctype[]; // �ַ��飨��ַ��Ӧ��ԡ�

14 extern char _ctmp; // һ��ʱ�ַ��ڶ��lib/ctype.c�У��

// ��һЩȷ��ַ��͵ĺꡣ

16 #define isalnum(c) ((_ctype+1)[c]&(_U|_L|_D)) // ��ַ��[A-Z]��[a-z]��[0-9]��

17 #define isalpha(c) ((_ctype+1)[c]&(_U|_L)) // ��ַ��

18 #define iscntrl(c) ((_ctype+1)[c]&(_C)) // �ǿ��ַ��

19 #define isdigit(c) ((_ctype+1)[c]&(_D)) // ��֡�

20 #define isgraph(c) ((_ctype+1)[c]&(_P|_U|_L|_D)) // ��ͼ��ַ��

21 #define islower(c) ((_ctype+1)[c]&(_L)) // ��Сд�ַ��

22 #define isprint(c) ((_ctype+1)[c]&(_P|_U|_L|_D|_SP)) // �ǿɴ�ӡ�ַ��

23 #define ispunct(c) ((_ctype+1)[c]&(_P)) // �Ǳ��š�

24 #define isspace(c) ((_ctype+1)[c]&(_S)) // �ǿհ��ַ��ո�,\f,\n,\r,\t,\v��

25 #define isupper(c) ((_ctype+1)[c]&(_U)) // �Ǵ�д�ַ��

26 #define isxdigit(c) ((_ctype+1)[c]&(_D|_X)) // ��ʮ��֡�

// ��У��ǰʹ��ǰ׺��unsigned��c Ӧ�ü��ţ��ʾ�� (c)��

// ��Ϊ�ڳ��c��һ��ӵı��ʽ��磬��a + b��ţ��ں궨

// ��б��ˣ�(unsigned) a + b��Ȼ��ԡ��ž��ȷ��ʾ��(unsigned)(a + b)��

28 #define isascii(c) (((unsigned) c)<=0x7f) // ��ASCII�ַ��

29 #define toascii(c) (((unsigned) c)&0x7f) // ת��ASCII�ַ��

// ��궨��ʹ��һ��ʱ��_ctmp��ԭ��ǣ��ں궨��У��Ĳ��ֻ�ܱ�ʹ��һ�Ρ�

// ��ڶ��߳��˵��ǲ��ȫ�ģ��Ϊ��߳̿��ͬһʱ��ʹ��ʱ��

// ��˴�Linux 2.2.x�汾��ʼ��Ϊʹ��ȡ��궨�塣

31 #define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp-('A'-'a'):_ctmp) // ת��Сд�ַ��

32 #define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp-('a'-'A'):_ctmp) // ת��ɴ�д�ַ��

34 #endif