Plan 9's rc.
not a clear win over byron's,
but at least it has the right syntax.
diff --git a/src/cmd/rc/rc.h b/src/cmd/rc/rc.h
new file mode 100644
index 0000000..c81b628
--- /dev/null
+++ b/src/cmd/rc/rc.h
@@ -0,0 +1,136 @@
+/*
+ * 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>
+#define NSIG 32
+#define SIGINT 2
+#define SIGQUIT 3
+#endif
+#ifdef V9
+#include <signal.h>
+#include <libc.h>
+#endif
+#ifdef Sun
+#include <signal.h>
+#endif
+#define YYMAXDEPTH 500
+#ifndef PAREN
+#ifndef YYMAJOR
+#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;
+
+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 */
+};
+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;
