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 * Plan9 is defined for plan 9
 * V9 is defined for 9th edition
 * Sun is defined for sun-os
 * Please don't litter the code with ifdefs.  The three below (and one in
 * getflags) should be enough.
#define     Plan9
#ifdef      Plan9
#include <u.h>
#include <libc.h>
#undef NSIG
#undef SIGINT
#undef SIGQUIT
#define     NSIG  32
#define     SIGINT      2
#define     SIGQUIT     3
#ifdef      V9
#include <signal.h>
#include <libc.h>
#ifdef Sun
#include <signal.h>
#define     YYMAXDEPTH  500
#ifndef PAREN
#ifndef YYMAJOR
#include "y.tab.h"

#undef pipe /* so that /dev/fd works */
#define searchpath rcsearchpath     /* avoid new libc function */

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;

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
char tok[NTOK];
#define     APPEND      1
#define     WRITE 2
#define     READ  3
#define     HERE  4
#define     DUPFD 5
#define     CLOSE 6
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 */
      void  (*changefn)(var*);
var *vlook(char*), *gvlook(char*), *newvar(char*, var*);
#define     NVAR  521
var *gvar[NVAR];                    /* hash for globals */
#define     new(type)   ((type *)emalloc(sizeof(type)))
char *emalloc(long);
void *Malloc(ulong);
void efree(char*);
#define     NOFILE      128         /* should come from <param.h> */
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  ((char)0x01)
 * onebyte(c), twobyte(c), threebyte(c)
 * Is c the first character of a one- two- or three-byte utf sequence?
#define     onebyte(c)  ((c&0x80)==0x00)
#define     twobyte(c)  ((c&0xe0)==0xc0)
#define     threebyte(c)      ((c&0xf0)==0xe0)
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
extern char *Rcmain(), Fdprefix[];
#define     register
 * 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;
int kidpid;

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