1 /* $NetBSD: tree.h,v 1.3 1999/10/20 15:10:00 hubertf Exp $ */ 2 3 /* 4 * command trees for compile/execute 5 */ 6 7 /* $Id: tree.h,v 1.3 1999/10/20 15:10:00 hubertf Exp $ */ 8 9 #define NOBLOCK ((struct op *)NULL) 10 #define NOWORD ((char *)NULL) 11 #define NOWORDS ((char **)NULL) 12 13 /* 14 * Description of a command or an operation on commands. 15 */ 16 struct op { 17 short type; /* operation type, see below */ 18 union { /* WARNING: newtp(), tcopy() use evalflags = 0 to clear union */ 19 short evalflags; /* TCOM: arg expansion eval() flags */ 20 short ksh_func; /* TFUNC: function x (vs x()) */ 21 } u; 22 char **args; /* arguments to a command */ 23 char **vars; /* variable assignments */ 24 struct ioword **ioact; /* IO actions (eg, < > >>) */ 25 struct op *left, *right; /* descendents */ 26 char *str; /* word for case; identifier for for, 27 * select, and functions; 28 * path to execute for TEXEC; 29 * time hook for TCOM. 30 */ 31 int lineno; /* TCOM/TFUNC: LINENO for this */ 32 }; 33 34 /* Tree.type values */ 35 #define TEOF 0 36 #define TCOM 1 /* command */ 37 #define TPAREN 2 /* (c-list) */ 38 #define TPIPE 3 /* a | b */ 39 #define TLIST 4 /* a ; b */ 40 #define TOR 5 /* || */ 41 #define TAND 6 /* && */ 42 #define TBANG 7 /* ! */ 43 #define TDBRACKET 8 /* [[ .. ]] */ 44 #define TFOR 9 45 #define TSELECT 10 46 #define TCASE 11 47 #define TIF 12 48 #define TWHILE 13 49 #define TUNTIL 14 50 #define TELIF 15 51 #define TPAT 16 /* pattern in case */ 52 #define TBRACE 17 /* {c-list} */ 53 #define TASYNC 18 /* c & */ 54 #define TFUNCT 19 /* function name { command; } */ 55 #define TTIME 20 /* time pipeline */ 56 #define TEXEC 21 /* fork/exec eval'd TCOM */ 57 #define TCOPROC 22 /* coprocess |& */ 58 59 /* 60 * prefix codes for words in command tree 61 */ 62 #define EOS 0 /* end of string */ 63 #define CHAR 1 /* unquoted character */ 64 #define QCHAR 2 /* quoted character */ 65 #define COMSUB 3 /* $() substitution (0 terminated) */ 66 #define EXPRSUB 4 /* $(()) substitution (0 terminated) */ 67 #define OQUOTE 5 /* opening " or ' */ 68 #define CQUOTE 6 /* closing " or ' */ 69 #define OSUBST 7 /* opening ${ subst (followed by { or X) */ 70 #define CSUBST 8 /* closing } of above (followed by } or X) */ 71 #define OPAT 9 /* open pattern: *(, @(, etc. */ 72 #define SPAT 10 /* separate pattern: | */ 73 #define CPAT 11 /* close pattern: ) */ 74 75 /* 76 * IO redirection 77 */ 78 struct ioword { 79 int unit; /* unit affected */ 80 int flag; /* action (below) */ 81 char *name; /* file name (unused if heredoc) */ 82 char *delim; /* delimiter for <<,<<- */ 83 char *heredoc;/* content of heredoc */ 84 }; 85 86 /* ioword.flag - type of redirection */ 87 #define IOTYPE 0xF /* type: bits 0:3 */ 88 #define IOREAD 0x1 /* < */ 89 #define IOWRITE 0x2 /* > */ 90 #define IORDWR 0x3 /* <>: todo */ 91 #define IOHERE 0x4 /* << (here file) */ 92 #define IOCAT 0x5 /* >> */ 93 #define IODUP 0x6 /* <&/>& */ 94 #define IOEVAL BIT(4) /* expand in << */ 95 #define IOSKIP BIT(5) /* <<-, skip ^\t* */ 96 #define IOCLOB BIT(6) /* >|, override -o noclobber */ 97 #define IORDUP BIT(7) /* x<&y (as opposed to x>&y) */ 98 #define IONAMEXP BIT(8) /* name has been expanded */ 99 100 /* execute/exchild flags */ 101 #define XEXEC BIT(0) /* execute without forking */ 102 #define XFORK BIT(1) /* fork before executing */ 103 #define XBGND BIT(2) /* command & */ 104 #define XPIPEI BIT(3) /* input is pipe */ 105 #define XPIPEO BIT(4) /* output is pipe */ 106 #define XPIPE (XPIPEI|XPIPEO) /* member of pipe */ 107 #define XXCOM BIT(5) /* `...` command */ 108 #define XPCLOSE BIT(6) /* exchild: close close_fd in parent */ 109 #define XCCLOSE BIT(7) /* exchild: close close_fd in child */ 110 #define XERROK BIT(8) /* non-zero exit ok (for set -e) */ 111 #define XCOPROC BIT(9) /* starting a co-process */ 112 #define XTIME BIT(10) /* timeing TCOM command */ 113 #define XINTACT BIT(11) /* OS2: proc started from interactive session */ 114 115 /* 116 * flags to control expansion of words (assumed by t->evalflags to fit 117 * in a short) 118 */ 119 #define DOBLANK BIT(0) /* perform blank interpretation */ 120 #define DOGLOB BIT(1) /* expand [?* */ 121 #define DOPAT BIT(2) /* quote *?[ */ 122 #define DOTILDE BIT(3) /* normal ~ expansion (first char) */ 123 #define DONTRUNCOMMAND BIT(4) /* do not run $(command) things */ 124 #define DOASNTILDE BIT(5) /* assignment ~ expansion (after =, :) */ 125 #define DOBRACE_ BIT(6) /* used by expand(): do brace expansion */ 126 #define DOMAGIC_ BIT(7) /* used by expand(): string contains MAGIC */ 127 #define DOTEMP_ BIT(8) /* ditto : in word part of ${..[%#=?]..} */ 128 #define DOVACHECK BIT(9) /* var assign check (for typeset, set, etc) */ 129 #define DOMARKDIRS BIT(10) /* force markdirs behaviour */ 130 131 /* 132 * The arguments of [[ .. ]] expressions are kept in t->args[] and flags 133 * indicating how the arguments have been munged are kept in t->vars[]. 134 * The contents of t->vars[] are stuffed strings (so they can be treated 135 * like all other t->vars[]) in which the second character is the one that 136 * is examined. The DB_* defines are the values for these second characters. 137 */ 138 #define DB_NORM 1 /* normal argument */ 139 #define DB_OR 2 /* || -> -o conversion */ 140 #define DB_AND 3 /* && -> -a conversion */ 141 #define DB_BE 4 /* an inserted -BE */ 142 #define DB_PAT 5 /* a pattern argument */ 143