root/include/linux/ctype.h

/* */

INCLUDED FROM

   1 #ifndef _LINUX_CTYPE_H
   2 #define _LINUX_CTYPE_H
   3 
   4 #define _U      0x01    /* upper */
   5 #define _L      0x02    /* lower */
   6 #define _D      0x04    /* digit */
   7 #define _C      0x08    /* cntrl */
   8 #define _P      0x10    /* punct */
   9 #define _S      0x20    /* white space (space/lf/tab) */
  10 #define _X      0x40    /* hex digit */
  11 #define _SP     0x80    /* hard space (0x20) */
  12 
  13 extern unsigned char _ctype[];
  14 extern char _ctmp;
  15 
  16 #define isalnum(c) ((_ctype+1)[c]&(_U|_L|_D))
  17 #define isalpha(c) ((_ctype+1)[c]&(_U|_L))
  18 #define iscntrl(c) ((_ctype+1)[c]&(_C))
  19 #define isdigit(c) ((_ctype+1)[c]&(_D))
  20 #define isgraph(c) ((_ctype+1)[c]&(_P|_U|_L|_D))
  21 #define islower(c) ((_ctype+1)[c]&(_L))
  22 #define isprint(c) ((_ctype+1)[c]&(_P|_U|_L|_D|_SP))
  23 #define ispunct(c) ((_ctype+1)[c]&(_P))
  24 #define isspace(c) ((_ctype+1)[c]&(_S))
  25 #define isupper(c) ((_ctype+1)[c]&(_U))
  26 #define isxdigit(c) ((_ctype+1)[c]&(_D|_X))
  27 
  28 #define isascii(c) (((unsigned) c)<=0x7f)
  29 #define toascii(c) (((unsigned) c)&0x7f)
  30 
  31 #define tolower(c) (_ctmp=c,isupper(_ctmp)?_ctmp-('A'-'a'):_ctmp)
  32 #define toupper(c) (_ctmp=c,islower(_ctmp)?_ctmp-('a'-'A'):_ctmp)
  33 
  34 #endif

/* */