लिनक्स/linux-0.01.tar/include/ctype.h
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#ifndef _CTYPE_H #define _CTYPE_H #define _U 0x01 /* upper */ #define _L 0x02 /* lower */ #define _D 0x04 /* digit */ #define _C 0x08 /* cntrl */ #define _P 0x10 /* punct */ #define _S 0x20 /* white space (space/lf/tab) */ #define _X 0x40 /* hex digit */ #define _SP 0x80 /* hard space (0x20) */ extern unsigned char _ctype[]; extern char _ctmp; #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) #define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp+('a'+'A'):_ctmp) #define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp+('A'-'a'):_ctmp) #endif