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syntax.c revision 1.5.4.1 
      1 /*	$NetBSD: syntax.c,v 1.5.4.1 2019/06/10 21:41:04 christos Exp $	*/
      2 
      3 #include <sys/cdefs.h>
      4 __RCSID("$NetBSD: syntax.c,v 1.5.4.1 2019/06/10 21:41:04 christos Exp $");
      5 
      6 #include <limits.h>
      7 #include "shell.h"
      8 #include "syntax.h"
      9 #include "parser.h"
     10 
     11 #if CWORD != 0
     12 #error initialisation assumes 'CWORD' is zero
     13 #endif
     14 
     15 #define ndx(ch) (ch + 2 - CHAR_MIN)
     16 #define set(ch, val) [ndx(ch)] = val,
     17 #define set_range(s, e, val) [ndx(s) ... ndx(e)] = val,
     18 
     19 /* syntax table used when not in quotes */
     20 const char basesyntax[258] = { CFAKE, CEOF,
     21     set_range(CTL_FIRST, CTL_LAST, CCTL)
     22 /* Note code assumes that only the above are CCTL in basesyntax */
     23     set('\n', CNL)
     24     set('\\', CBACK)
     25     set('\'', CSQUOTE)
     26     set('"', CDQUOTE)
     27     set('`', CBQUOTE)
     28     set('$', CVAR)
     29     set('}', CENDVAR)
     30     set('<', CSPCL)
     31     set('>', CSPCL)
     32     set('(', CSPCL)
     33     set(')', CSPCL)
     34     set(';', CSPCL)
     35     set('&', CSPCL)
     36     set('|', CSPCL)
     37     set(' ', CSPCL)
     38     set('\t', CSPCL)
     39 };
     40 
     41 /* syntax table used when in double quotes */
     42 const char dqsyntax[258] = { CFAKE, CEOF,
     43     set_range(CTL_FIRST, CTL_LAST, CCTL)
     44     set('\n', CNL)
     45     set('\\', CBACK)
     46     set('"', CDQUOTE)
     47     set('`', CBQUOTE)
     48     set('$', CVAR)
     49     set('}', CENDVAR)
     50     /* ':/' for tilde expansion, '-]' for [a\-x] pattern ranges */
     51     set('!', CCTL)
     52     set('*', CCTL)
     53     set('?', CCTL)
     54     set('[', CCTL)
     55     set('=', CCTL)
     56     set('~', CCTL)
     57     set(':', CCTL)
     58     set('/', CCTL)
     59     set('-', CCTL)
     60     set(']', CCTL)
     61 };
     62 
     63 /* syntax table used when in single quotes */
     64 const char sqsyntax[258] = { CFAKE, CEOF,
     65 /* CCTL includes anything that might perhaps need to be escaped if quoted */
     66     set_range(CTL_FIRST, CTL_LAST, CCTL)
     67     set('\n', CNL)
     68     set('\'', CSQUOTE)
     69     set('\\', CSBACK)
     70     /* ':/' for tilde expansion, '-]' for [a\-x] pattern ranges */
     71     set('!', CCTL)
     72     set('*', CCTL)
     73     set('?', CCTL)
     74     set('[', CCTL)
     75     set('=', CCTL)
     76     set('~', CCTL)
     77     set(':', CCTL)
     78     set('/', CCTL)
     79     set('-', CCTL)
     80     set(']', CCTL)
     81 };
     82 
     83 /* syntax table used when in arithmetic */
     84 const char arisyntax[258] = { CFAKE, CEOF,
     85     set_range(CTL_FIRST, CTL_LAST, CCTL)
     86     set('\n', CNL)
     87     set('\\', CBACK)
     88     set('`', CBQUOTE)
     89     set('\'', CSQUOTE)
     90     set('"', CDQUOTE)
     91     set('$', CVAR)
     92     set('}', CENDVAR)
     93     set('(', CLP)
     94     set(')', CRP)
     95 };
     96 
     97 /* character classification table */
     98 const char is_type[258] = { 0, 0,
     99     set_range('0', '9', ISDIGIT)
    100     set_range('a', 'z', ISLOWER)
    101     set_range('A', 'Z', ISUPPER)
    102     set('_', ISUNDER)
    103     set('#', ISSPECL)
    104     set('?', ISSPECL)
    105     set('$', ISSPECL)
    106     set('!', ISSPECL)
    107     set('-', ISSPECL)
    108     set('*', ISSPECL)
    109     set('@', ISSPECL)
    110     set(' ', ISSPACE)
    111     set('\t', ISSPACE)
    112     set('\n', ISSPACE)
    113 };
    114