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tree.h

@@ -0,0 +1,142 @@
+/*	$OpenBSD: tree.h,v 1.7 1999/07/14 13:37:24 millert Exp $	*/
+
+/*
+ * command trees for compile/execute
+ */
+
+/* $From: 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 */