\linux-1.0\linux\include\linux\ctype.h #ifndef _LINUX_CTYPE_H #define _LINUX_CTYPE_H#define _U 0x01 /* upper */ //大寫字母 #define _L 0x02 /* lower */ //小寫字母 #define _D 0x04 /* digit */ //數(shù)字 #define _C 0x08 /* cntrl */ //控制按鍵 #define _P 0x10 /* punct */ // #define _S 0x20 /* white space (space/lf/tab) */ #define _X 0x40 /* hex digit */ //十六進(jìn)制數(shù) #define _SP 0x80 /* hard space (0x20) */extern unsigned char _ctype[]; extern char _ctmp;//通過設(shè)定ascii表不同的位置為什么類型， 判斷時(shí)直接比較！速度很快！ #define isalnum(c) ((_ctype+1)[c]&(_U|_L|_D)) #define isalpha(c) ((_ctype+1)[c]&(_U|_L)) #define iscntrl(c) ((_ctype+1)[c]&(_C)) #define isdigit(c) ((_ctype+1)[c]&(_D)) #define isgraph(c) ((_ctype+1)[c]&(_P|_U|_L|_D)) #define islower(c) ((_ctype+1)[c]&(_L)) #define isprint(c) ((_ctype+1)[c]&(_P|_U|_L|_D|_SP)) #define ispunct(c) ((_ctype+1)[c]&(_P)) #define isspace(c) ((_ctype+1)[c]&(_S)) #define isupper(c) ((_ctype+1)[c]&(_U)) #define isxdigit(c) ((_ctype+1)[c]&(_D|_X))#define isascii(c) (((unsigned) c)<=0x7f) #define toascii(c) (((unsigned) c)&0x7f)//2步宏，第1步賦值（防止傳入值被修改），第2步 做相應(yīng)的操作！ #define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp-('A'-'a'):_ctmp) #define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp-('a'-'A'):_ctmp)#endif

?\linux-1.0\linux\include\linux\ctype.c

/** linux/lib/ctype.c** Copyright (C) 1991, 1992 Linus Torvalds*/#include <linux/ctype.h>char _ctmp; //設(shè)定ASCII碼對(duì)應(yīng)的值! unsigned char _ctype[] = {0x00, /* EOF */ _C,_C,_C,_C,_C,_C,_C,_C, /* 0-7 */ _C,_C|_S,_C|_S,_C|_S,_C|_S,_C|_S,_C,_C, /* 8-15 */ _C,_C,_C,_C,_C,_C,_C,_C, /* 16-23 */ _C,_C,_C,_C,_C,_C,_C,_C, /* 24-31 */ _S|_SP,_P,_P,_P,_P,_P,_P,_P, /* 32-39 */ _P,_P,_P,_P,_P,_P,_P,_P, /* 40-47 */ _D,_D,_D,_D,_D,_D,_D,_D, /* 48-55 */ _D,_D,_P,_P,_P,_P,_P,_P, /* 56-63 */ _P,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U, /* 64-71 */ _U,_U,_U,_U,_U,_U,_U,_U, /* 72-79 */ _U,_U,_U,_U,_U,_U,_U,_U, /* 80-87 */ _U,_U,_U,_P,_P,_P,_P,_P, /* 88-95 */ _P,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L, /* 96-103 */ _L,_L,_L,_L,_L,_L,_L,_L, /* 104-111 */ _L,_L,_L,_L,_L,_L,_L,_L, /* 112-119 */ _L,_L,_L,_P,_P,_P,_P,_C, /* 120-127 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 128-143 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 144-159 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 160-175 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 176-191 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 192-207 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 208-223 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 224-239 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; /* 240-255 */

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