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Annotation of 43BSD/bin/csh/sh.char.h, revision 1.1

1.1     ! root        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))

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