4.3BSD - /usr/src/bin/csh/sh.char.h

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley Software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)sh.char.h	5.3 (Berkeley) 3/29/86
   7:  */
   8: 
   9: /*
  10:  * Table for spotting special characters quickly
  11:  *
  12:  * Makes for very obscure but efficient coding.
  13:  */
  14: 
  15: extern unsigned short _cmap[];
  16: 
  17: #define _Q  0x01        /* '" */
  18: #define _Q1 0x02        /* ` */
  19: #define _SP 0x04        /* space and tab */
  20: #define _NL 0x08        /* \n */
  21: #define _META   0x10        /* lex meta characters, sp #'`";&<>()|\t\n */
  22: #define _GLOB   0x20        /* glob characters, *?{[` */
  23: #define _ESC    0x40        /* \ */
  24: #define _DOL    0x80        /* $ */
  25: #define _DIG   0x100        /* 0-9 */
  26: #define _LET   0x200        /* a-z, A-Z, _ */
  27: 
  28: #define cmap(c, bits)   (_cmap[(unsigned char)(c)] & (bits))
  29: 
  30: #define isglob(c)   cmap(c, _GLOB)
  31: #define isspace(c)  cmap(c, _SP)
  32: #define isspnl(c)   cmap(c, _SP|_NL)
  33: #define ismeta(c)   cmap(c, _META)
  34: #define digit(c)    cmap(c, _DIG)
  35: #define letter(c)   cmap(c, _LET)
  36: #define alnum(c)    (digit(c) || letter(c))

Defined macros

Usage of this include