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/*
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* command trees for compile/execute
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*/
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/* $Id: tree.h,v 1.3 1994/05/31 13:34:34 michael Exp $ */
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#define NOBLOCK ((struct op *)NULL)
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#define NOWORD ((char *)NULL)
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#define NOWORDS ((char **)NULL)
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/*
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* Description of a command or an operation on commands.
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*/
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struct op {
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short type; /* operation type, see below */
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union { /* WARNING: newtp(), tcopy() use evalflags = 0 to clear union */
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short evalflags; /* TCOM: arg expansion eval() flags */
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short ksh_func; /* TFUNC: function x (vs x()) */
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} u;
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char **args; /* arguments to a command */
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char **vars; /* variable assignments */
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struct ioword **ioact; /* IO actions (eg, < > >>) */
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struct op *left, *right; /* descendents */
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char *str; /* word for case; identifier for for,
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* select, and functions;
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* path to execute for TEXEC;
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* time hook for TCOM.
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*/
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int lineno; /* TCOM/TFUNC: LINENO for this */
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};
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/* Tree.type values */
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#define TEOF 0
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#define TCOM 1 /* command */
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#define TPAREN 2 /* (c-list) */
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#define TPIPE 3 /* a | b */
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#define TLIST 4 /* a ; b */
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#define TOR 5 /* || */
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#define TAND 6 /* && */
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#define TBANG 7 /* ! */
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#define TDBRACKET 8 /* [[ .. ]] */
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#define TFOR 9
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#define TSELECT 10
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#define TCASE 11
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#define TIF 12
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#define TWHILE 13
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#define TUNTIL 14
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#define TELIF 15
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#define TPAT 16 /* pattern in case */
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#define TBRACE 17 /* {c-list} */
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#define TASYNC 18 /* c & */
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#define TFUNCT 19 /* function name { command; } */
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#define TTIME 20 /* time pipeline */
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#define TEXEC 21 /* fork/exec eval'd TCOM */
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#define TCOPROC 22 /* coprocess |& */
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/*
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* prefix codes for words in command tree
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*/
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#define EOS 0 /* end of string */
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#define CHAR 1 /* unquoted character */
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#define QCHAR 2 /* quoted character */
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#define COMSUB 3 /* $() substitution (0 terminated) */
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#define EXPRSUB 4 /* $(()) substitution (0 terminated) */
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#define OQUOTE 5 /* opening " or ' */
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#define CQUOTE 6 /* closing " or ' */
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#define OSUBST 7 /* opening ${ subst (followed by { or X) */
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#define CSUBST 8 /* closing } of above (followed by } or X) */
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#define OPAT 9 /* open pattern: *(, @(, etc. */
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#define SPAT 10 /* separate pattern: | */
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#define CPAT 11 /* close pattern: ) */
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/*
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* IO redirection
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*/
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struct ioword {
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int unit; /* unit affected */
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int flag; /* action (below) */
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char *name; /* file name (unused if heredoc) */
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char *delim; /* delimiter for <<,<<- */
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char *heredoc;/* content of heredoc */
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};
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/* ioword.flag - type of redirection */
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#define IOTYPE 0xF /* type: bits 0:3 */
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#define IOREAD 0x1 /* < */
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#define IOWRITE 0x2 /* > */
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#define IORDWR 0x3 /* <>: todo */
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#define IOHERE 0x4 /* << (here file) */
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#define IOCAT 0x5 /* >> */
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#define IODUP 0x6 /* <&/>& */
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#define IOEVAL BIT(4) /* expand in << */
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#define IOSKIP BIT(5) /* <<-, skip ^\t* */
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#define IOCLOB BIT(6) /* >|, override -o noclobber */
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#define IORDUP BIT(7) /* x<&y (as opposed to x>&y) */
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#define IONAMEXP BIT(8) /* name has been expanded */
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/* execute/exchild flags */
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#define XEXEC BIT(0) /* execute without forking */
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#define XFORK BIT(1) /* fork before executing */
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#define XBGND BIT(2) /* command & */
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#define XPIPEI BIT(3) /* input is pipe */
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#define XPIPEO BIT(4) /* output is pipe */
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#define XPIPE (XPIPEI|XPIPEO) /* member of pipe */
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#define XXCOM BIT(5) /* `...` command */
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#define XPCLOSE BIT(6) /* exchild: close close_fd in parent */
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#define XCCLOSE BIT(7) /* exchild: close close_fd in child */
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#define XERROK BIT(8) /* non-zero exit ok (for set -e) */
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#define XCOPROC BIT(9) /* starting a co-process */
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#define XTIME BIT(10) /* timeing TCOM command */
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#define XINTACT BIT(11) /* OS2: proc started from interactive session */
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/*
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* flags to control expansion of words (assumed by t->evalflags to fit
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* in a short)
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*/
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#define DOBLANK BIT(0) /* perform blank interpretation */
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#define DOGLOB BIT(1) /* expand [?* */
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#define DOPAT BIT(2) /* quote *?[ */
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#define DOTILDE BIT(3) /* normal ~ expansion (first char) */
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#define DONTRUNCOMMAND BIT(4) /* do not run $(command) things */
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#define DOASNTILDE BIT(5) /* assignment ~ expansion (after =, :) */
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#define DOBRACE_ BIT(6) /* used by expand(): do brace expansion */
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#define DOMAGIC_ BIT(7) /* used by expand(): string contains MAGIC */
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#define DOTEMP_ BIT(8) /* ditto : in word part of ${..[%#=?]..} */
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#define DOVACHECK BIT(9) /* var assign check (for typeset, set, etc) */
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#define DOMARKDIRS BIT(10) /* force markdirs behaviour */
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/*
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* The arguments of [[ .. ]] expressions are kept in t->args[] and flags
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* indicating how the arguments have been munged are kept in t->vars[].
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* The contents of t->vars[] are stuffed strings (so they can be treated
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* like all other t->vars[]) in which the second character is the one that
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* is examined. The DB_* defines are the values for these second characters.
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*/
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#define DB_NORM 1 /* normal argument */
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#define DB_OR 2 /* || -> -o conversion */
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#define DB_AND 3 /* && -> -a conversion */
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#define DB_BE 4 /* an inserted -BE */
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#define DB_PAT 5 /* a pattern argument */
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