linux_011-_ctype.h头文件

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#ifndef _CTYPE_H#define _CTYPE_H/*对应与ascii码表*/#define _U0x01  /*大写字母*/#define _L0x02  /*小写字幕*/#define _D0x04  /*数字[0-9]*/#define _C0x08  /*控制字符*/#define _P0x10  /*标点符号*/#define _S0x20  /*空白字符*/#define _X0x40  /*16进制数字*/#define _SP0x80  /*用于空格字符*/extern unsigned char _ctype[]; /*字符特性数组*/extern char _ctmp;             /*临时变量*//*确定字符特性的宏定义*/#define isalnum(c) ((_ctype+1)[c] & (_U|_L|_D))       /**//*是字符或数字[A-Z][a-z][0-9]*/   #define isalpha(c) ((_ctype+1)[c] & (|U|_L))         /*字符*/#define iscntrl(c) ((_ctype+1)[c] & (_C))        /*控制字符*/#define isdigit(c) ((_ctype+1)[c] & (_D))        /*是数字*/#define isgraph(c) ((_ctype+1)[c] & (_P|_U|_L|_D))             /*是图形字符*/#define islower(c) ((_ctype+1)[c] & (_L))     /*是小写字符*/#define isprint(c) ((_ctype+1)[c] & (_P|_U|_L|_D|_SP))/*可打印字符*/#define ispunct(c) ((_ctype+1)[c] & (_P))             /*是标点符号*/#define isspace(c) ((_ctype+1)[c] & (_S))  /*是空白字符如空格,\f \n \r \t \v */#define isupper(c) ((_ctype+1)[c] & (_U))/*是大写字符*/#define isxdigit(c) ((_ctype+1)[c] & (_D|_X))/*是16进制数字*/                                                      /**/#define isaxcii(c) (((unsigned) c)<=0x7f)/*判断是否是ascii码*/#define toascii(c) (((unsigned)c)&0x7f)/*转换成ascii码*/#define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp-('A'-'a'):_ctmp) /*转换成小写字符*/#define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp-('a'-'A'):_ctmp) /*转换成大写字符*/#endif
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