/*  * 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. */ /* * Assume plan 9 by default; if Unix is defined, assume unix. * Please don't litter the code with ifdefs.  The five below should be enough. */ #ifndef Unix/* plan 9 */#include <u.h>#include <libc.h> #define	NSIG	32#define	SIGINT	2#define	SIGQUIT	3 #define fcntl(fd, op, arg)	/* unix compatibility */#define F_SETFD#define FD_CLOEXEC#else#include "unix.h"#endif #ifndef ERRMAX#define ERRMAX 128#endif #define	YYMAXDEPTH	500#ifndef YYPREFIX#ifndef PAREN#include "x.tab.h"#endif#endif typedef struct tree tree;typedef struct word word;typedef struct io io;typedef union code code;typedef struct var var;typedef struct list list;typedef struct redir redir;typedef struct thread thread;typedef struct builtin builtin; #ifndef Unix#pragma incomplete word#pragma incomplete io#endif struct tree{	int	type;	int	rtype, fd0, fd1;	/* details of REDIR PIPE DUP tokens */	char	*str;	int	quoted;	int	iskw;	tree	*child[3];	tree	*next;};tree *newtree(void);tree *token(char*, int), *klook(char*), *tree1(int, tree*);tree *tree2(int, tree*, tree*), *tree3(int, tree*, tree*, tree*);tree *mung1(tree*, tree*), *mung2(tree*, tree*, tree*);tree *mung3(tree*, tree*, tree*, tree*), *epimung(tree*, tree*);tree *simplemung(tree*), *heredoc(tree*);void freetree(tree*);tree *cmdtree; /* * The first word of any code vector is a reference count. * Always create a new reference to a code vector by calling codecopy(.). * Always call codefree(.) when deleting a reference. */union code{	void	(*f)(void);	int	i;	char	*s;}; char *promptstr;int doprompt; #define	NTOK	8192		/* maximum bytes in a word (token) */ char tok[NTOK + UTFmax]; #define	APPEND	1#define	WRITE	2#define	READ	3#define	HERE	4#define	DUPFD	5#define	CLOSE	6#define RDWR	7 struct var{	char	*name;		/* ascii name */	word	*val;		/* value */	int	changed;	code	*fn;		/* pointer to function's code vector */	int	fnchanged;	int	pc;		/* pc of start of function */	var	*next;		/* next on hash or local list */};var *vlook(char*), *gvlook(char*), *newvar(char*, var*); #define	NVAR	521 var *gvar[NVAR];		/* hash for globals */ #define	new(type)	((type *)emalloc(sizeof(type))) void *emalloc(long);void *Malloc(ulong);void efree(void *); struct here{	tree	*tag;	char	*name;	struct here *next;};int mypid; /* * Glob character escape in strings: *	In a string, GLOB must be followed by *?[ or GLOB. *	GLOB* matches any string *	GLOB? matches any single character *	GLOB[...] matches anything in the brackets *	GLOBGLOB matches GLOB */#define	GLOB	'\001' char **argp;char **args;int nerror;		/* number of errors encountered during compilation */int doprompt;		/* is it time for a prompt? *//* * Which fds are the reading/writing end of a pipe? * Unfortunately, this can vary from system to system. * 9th edition Unix doesn't care, the following defines * work on plan 9. */#define	PRD	0#define	PWR	1 char *Rcmain, *Fdprefix;/* * How many dot commands have we executed? * Used to ensure that -v flag doesn't print rcmain. */int ndot;char *getstatus(void);int lastc;int lastword;