ref: 5cee3c5e3fdc511a468879104c08a1aa0e8c2b0f
dir: /include/ctype.h/
#ifndef _CTYPE_H #define _CTYPE_H extern int isalnum(int); extern int isalpha(int); extern int islower(int); extern int isupper(int); extern int isdigit(int); extern int isxdigit(int); extern int iscntrl(int); extern int isgraph(int); extern int isspace(int); extern int isblank(int); extern int isprint(int); extern int ispunct(int); extern int tolower(int); extern int toupper(int); #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 char */ #define _SP 0x80 /* hard space (0x20) */ extern const unsigned char __ctype[]; #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)) #endif