/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * command trees for compile/execute */ /* $Id: tree.h,v 1.3 1994/05/31 13:34:34 michael Exp $ */ #define	NOBLOCK	((struct op *)NULL)#define	NOWORD	((char *)NULL)#define	NOWORDS	((char **)NULL) /* * Description of a command or an operation on commands. */struct op {	short	type;			/* operation type, see below */	union { /* WARNING: newtp(), tcopy() use evalflags = 0 to clear union */		short	evalflags;	/* TCOM: arg expansion eval() flags */		short	ksh_func;	/* TFUNC: function x (vs x()) */	} u;	char  **args;			/* arguments to a command */	char  **vars;			/* variable assignments */	struct ioword	**ioact;	/* IO actions (eg, < > >>) */	struct op *left, *right; 	/* descendents */	char   *str;			/* word for case; identifier for for,					 * select, and functions;					 * path to execute for TEXEC;					 * time hook for TCOM.					 */	int	lineno;			/* TCOM/TFUNC: LINENO for this */}; /* Tree.type values */#define	TEOF		0#define	TCOM		1	/* command */#define	TPAREN		2	/* (c-list) */#define	TPIPE		3	/* a | b */#define	TLIST		4	/* a ; b */#define	TOR		5	/* || */#define	TAND		6	/* && */#define TBANG		7	/* ! */#define TDBRACKET	8	/* [[ .. ]] */#define	TFOR		9#define TSELECT		10#define	TCASE		11#define	TIF		12#define	TWHILE		13#define	TUNTIL		14#define	TELIF		15#define	TPAT		16	/* pattern in case */#define	TBRACE		17	/* {c-list} */#define	TASYNC		18	/* c & */#define	TFUNCT		19	/* function name { command; } */#define	TTIME		20	/* time pipeline */#define	TEXEC		21	/* fork/exec eval'd TCOM */#define TCOPROC		22	/* coprocess |& */ /* * prefix codes for words in command tree */#define	EOS	0		/* end of string */#define	CHAR	1		/* unquoted character */#define	QCHAR	2		/* quoted character */#define	COMSUB	3		/* $() substitution (0 terminated) */#define EXPRSUB	4		/* $(()) substitution (0 terminated) */#define	OQUOTE	5		/* opening " or ' */#define	CQUOTE	6		/* closing " or ' */#define	OSUBST	7		/* opening ${ subst (followed by { or X) */#define	CSUBST	8		/* closing } of above (followed by } or X) */#define OPAT	9		/* open pattern: *(, @(, etc. */#define SPAT	10		/* separate pattern: | */#define CPAT	11		/* close pattern: ) */ /* * IO redirection */struct ioword {	int	unit;	/* unit affected */	int	flag;	/* action (below) */	char	*name;	/* file name (unused if heredoc) */	char	*delim;	/* delimiter for <<,<<- */	char	*heredoc;/* content of heredoc */}; /* ioword.flag - type of redirection */#define	IOTYPE	0xF		/* type: bits 0:3 */#define	IOREAD	0x1		/* < */#define	IOWRITE	0x2		/* > */#define	IORDWR	0x3		/* <>: todo */#define	IOHERE	0x4		/* << (here file) */#define	IOCAT	0x5		/* >> */#define	IODUP	0x6		/* <&/>& */#define	IOEVAL	BIT(4)		/* expand in << */#define	IOSKIP	BIT(5)		/* <<-, skip ^\t* */#define	IOCLOB	BIT(6)		/* >|, override -o noclobber */#define IORDUP	BIT(7)		/* x<&y (as opposed to x>&y) */#define IONAMEXP BIT(8)		/* name has been expanded */ /* execute/exchild flags */#define	XEXEC	BIT(0)		/* execute without forking */#define	XFORK	BIT(1)		/* fork before executing */#define	XBGND	BIT(2)		/* command & */#define	XPIPEI	BIT(3)		/* input is pipe */#define	XPIPEO	BIT(4)		/* output is pipe */#define	XPIPE	(XPIPEI|XPIPEO)	/* member of pipe */#define	XXCOM	BIT(5)		/* `...` command */#define	XPCLOSE	BIT(6)		/* exchild: close close_fd in parent */#define	XCCLOSE	BIT(7)		/* exchild: close close_fd in child */#define XERROK	BIT(8)		/* non-zero exit ok (for set -e) */#define XCOPROC BIT(9)		/* starting a co-process */#define XTIME	BIT(10)		/* timeing TCOM command */#define XINTACT BIT(11)		/* OS2: proc started from interactive session */ /* * flags to control expansion of words (assumed by t->evalflags to fit * in a short) */#define	DOBLANK	BIT(0)		/* perform blank interpretation */#define	DOGLOB	BIT(1)		/* expand [?* */#define	DOPAT	BIT(2)		/* quote *?[ */#define	DOTILDE	BIT(3)		/* normal ~ expansion (first char) */#define DONTRUNCOMMAND BIT(4)	/* do not run $(command) things */#define DOASNTILDE BIT(5)	/* assignment ~ expansion (after =, :) */#define DOBRACE_ BIT(6)		/* used by expand(): do brace expansion */#define DOMAGIC_ BIT(7)		/* used by expand(): string contains MAGIC */#define DOTEMP_	BIT(8)		/* ditto : in word part of ${..[%#=?]..} */#define DOVACHECK BIT(9)	/* var assign check (for typeset, set, etc) */#define DOMARKDIRS BIT(10)	/* force markdirs behaviour */ /* * The arguments of [[ .. ]] expressions are kept in t->args[] and flags * indicating how the arguments have been munged are kept in t->vars[]. * The contents of t->vars[] are stuffed strings (so they can be treated * like all other t->vars[]) in which the second character is the one that * is examined.  The DB_* defines are the values for these second characters. */#define DB_NORM	1		/* normal argument */#define DB_OR	2		/* || -> -o conversion */#define DB_AND	3		/* && -> -a conversion */#define DB_BE	4		/* an inserted -BE */#define DB_PAT	5		/* a pattern argument */