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	rc.h - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	rc.h (3495B)
	---
	1 /*
	2 * Plan9 is defined for plan 9
	3 * V9 is defined for 9th edition
	4 * Sun is defined for sun-os
	5 * Please don't litter the code with ifdefs. The three below (and one in
	6 * getflags) should be enough.
	7 */
	8 #define Plan9
	9 #ifdef Plan9
	10 #include <u.h>
	11 #include <libc.h>
	12 #undef NSIG
	13 #undef SIGINT
	14 #undef SIGQUIT
	15 #define NSIG 32
	16 #define SIGINT 2
	17 #define SIGQUIT 3
	18 #endif
	19 #ifdef V9
	20 #include <signal.h>
	21 #include <libc.h>
	22 #endif
	23 #ifdef Sun
	24 #include <signal.h>
	25 #endif
	26 #define YYMAXDEPTH 500
	27 #ifndef PAREN
	28 #ifndef YYMAJOR
	29 #include "x.tab.h"
	30 #endif
	31 #endif
	32
	33 #undef pipe /* so that /dev/fd works */
	34 #define searchpath rcsearchpath /* avoid new libc function */
	35
	36 typedef struct tree tree;
	37 typedef struct word word;
	38 typedef struct io io;
	39 typedef union code code;
	40 typedef struct var var;
	41 typedef struct list list;
	42 typedef struct redir redir;
	43 typedef struct thread thread;
	44 typedef struct builtin builtin;
	45
	46 struct tree{
	47 int type;
	48 int rtype, fd0, fd1; /* details of REDIR PIPE DUP…
	49 char *str;
	50 int quoted;
	51 int iskw;
	52 tree *child[3];
	53 tree *next;
	54 };
	55 tree *newtree(void);
	56 tree token(char, int), klook(char), tree1(int, tree);
	57 tree tree2(int, tree, tree), tree3(int, tree, tree, tree*);
	58 tree mung1(tree, tree), mung2(tree, tree, tree*);
	59 tree mung3(tree, tree, tree, tree), epimung(tree, tree);
	60 tree simplemung(tree), heredoc(tree);
	61 void freetree(tree*);
	62 tree *cmdtree;
	63 /*
	64 * The first word of any code vector is a reference count.
	65 * Always create a new reference to a code vector by calling codecopy(.).
	66 * Always call codefree(.) when deleting a reference.
	67 */
	68 union code{
	69 void (*f)(void);
	70 int i;
	71 char *s;
	72 };
	73 char *promptstr;
	74 int doprompt;
	75 #define NTOK 8192
	76 char tok[NTOK];
	77 #define APPEND 1
	78 #define WRITE 2
	79 #define READ 3
	80 #define HERE 4
	81 #define DUPFD 5
	82 #define CLOSE 6
	83 #define RDWR 7
	84 struct var{
	85 char name; / ascii name */
	86 word val; / value */
	87 int changed;
	88 code fn; / pointer to function's code vector */
	89 int fnchanged;
	90 int pc; /* pc of start of function */
	91 var next; / next on hash or local list */
	92 void (changefn)(var);
	93 };
	94 var vlook(char), gvlook(char), newvar(char, var*);
	95 #define NVAR 521
	96 var gvar[NVAR]; / hash for globals */
	97 #define new(type) ((type *)emalloc(sizeof(type)))
	98 char *emalloc(long);
	99 void *Malloc(ulong);
	100 void efree(char*);
	101 #define NOFILE 128 /* should come from <par…
	102 struct here{
	103 tree *tag;
	104 char *name;
	105 struct here *next;
	106 };
	107 int mypid;
	108 /*
	109 * Glob character escape in strings:
	110 * In a string, GLOB must be followed by *?[ or GLOB.
	111 * GLOB* matches any string
	112 * GLOB? matches any single character
	113 * GLOB[...] matches anything in the brackets
	114 * GLOBGLOB matches GLOB
	115 */
	116 #define GLOB ((char)0x01)
	117 /*
	118 * onebyte(c), twobyte(c), threebyte(c)
	119 * Is c the first character of a one- two- or three-byte utf sequence?
	120 */
	121 #define onebyte(c) ((c&0x80)==0x00)
	122 #define twobyte(c) ((c&0xe0)==0xc0)
	123 #define threebyte(c) ((c&0xf0)==0xe0)
	124 char **argp;
	125 char **args;
	126 int nerror; /* number of errors encountered during compil…
	127 int doprompt; /* is it time for a prompt? */
	128 /*
	129 * Which fds are the reading/writing end of a pipe?
	130 * Unfortunately, this can vary from system to system.
	131 * 9th edition Unix doesn't care, the following defines
	132 * work on plan 9.
	133 */
	134 #define PRD 0
	135 #define PWR 1
	136 extern char *Rcmain(), Fdprefix[];
	137 #define register
	138 /*
	139 * How many dot commands have we executed?
	140 * Used to ensure that -v flag doesn't print rcmain.
	141 */
	142 int ndot;
	143 char *getstatus(void);
	144 int lastc;
	145 int lastword;
	146 int kidpid;