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Annotation of 43BSD/bin/csh/sh.char.h, revision 1.1.1.1

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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