From bf03074e346b004659196b6c17eee04dbffd3ac2 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Fri, 15 Oct 2021 16:18:02 -0700
Subject: feat(rc): working prototype of input->compile->print loop

---
 sys/cmd/rc/rc.h | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 196 insertions(+)
 create mode 100644 sys/cmd/rc/rc.h

(limited to 'sys/cmd/rc/rc.h')

diff --git a/sys/cmd/rc/rc.h b/sys/cmd/rc/rc.h
new file mode 100644
index 0000000..1c2aa6b
--- /dev/null
+++ b/sys/cmd/rc/rc.h
@@ -0,0 +1,196 @@
+#pragma once
+
+#include <u.h>
+#include <libn.h>
+
+// -----------------------------------------------------------------------
+// types
+
+typedef struct Io     Io;
+typedef struct Var    Var;
+typedef struct Word   Word;
+typedef struct List   List;
+typedef struct Tree   Tree;
+typedef struct Redir  Redir;
+typedef union  Code   Code;
+typedef struct Thread Thread;
+
+typedef struct WaitMsg WaitMsg;
+
+struct Io
+{
+    int fd, cap;
+    char *s;
+    char *b, *e, buf[];
+};
+
+struct Tree
+{
+    int  type;
+    char *str;
+    Tree *child[3];
+    Tree *link;
+};
+
+struct Word
+{
+    char *str;
+    Word *link;
+};
+
+struct List
+{
+    Word *word;
+    List *link;
+};
+
+/*
+ * the first word of any code vector is a reference count
+ * always create a new reference to a code vector by calling copycode()
+ * always call freecode() when deleting a reference
+ */
+union Code
+{
+    int  i;
+    void (*f)(void);
+    char *s;
+};
+
+struct Var
+{
+    char *name;
+    Word *val;
+    short new     : 1;
+    short newfunc : 1;
+    Code *func;
+    void (*update)(Var *);
+    Var  *link;
+};
+
+enum
+{
+    Rclose,
+    Rdup,
+    Ropen,
+};
+
+struct Redir
+{
+    char type;              /* what to do */
+    short from, to;         /* what to do it to */
+    struct Redir *link;     /* what else to do (reverse order) */
+};
+
+struct Thread
+{
+    struct {
+        int  i;
+        Code *exe;
+    } code;     // execution stack
+    struct {
+        Io   *io;
+        char *path;
+    } cmd;       // command input
+
+    List  *args;  // argument stack
+    Var   *local; // local variables
+    Redir *redir; // list of redirections
+
+    struct {
+        ushort i   : 1;
+        ushort eof : 1;
+    } flag;    // flags for process
+
+    int  pid;
+    long line;
+
+    Tree  *nodes; // memory allocation
+    Thread *link; // process we return to
+};
+
+struct WaitMsg
+{
+    int   pid;      // of loved one
+    ulong time[3];  // of loved one & descendants
+    char *msg;
+};
+
+// -----------------------------------------------------------------------
+// globals
+
+extern int     rcpid;
+extern Thread *shell;
+extern Io     *errio;
+extern Code   *compiled;
+
+// -----------------------------------------------------------------------
+// functions
+
+/* util.c */
+void  itoa(char*, long i);
+void  fatal(char *, ...);
+void *emalloc(uintptr);
+void *erealloc(void*, uintptr);
+void  efree(void*);
+
+/* read.c */
+int  readline(char *);
+void enablevi(void);
+
+/* prompt.c */
+int prompt(ushort *);
+
+/* io.c */
+Io  *openfd(int fd);
+Io  *openstr(void);
+void terminate(Io *io);
+
+int  get(Io *);
+int  put(Io **, char);
+
+void flush(Io *io);
+void print(Io *, char *, ...);
+
+/* lex.c */
+int iswordchar(int c);
+int yylex(void);
+
+/* tree.c */
+Tree *maketree(void);
+Tree *maketree1(int, Tree*);
+Tree *maketree2(int, Tree*, Tree*);
+Tree *maketree3(int, Tree*, Tree*, Tree*);
+
+Tree *token(int, char *);
+Tree *hangchild1(Tree *, Tree *, int at);
+
+void freeparsetree(void);
+
+/* sys.c */
+void initenv(void);
+
+void addwait(int);
+void clearwait(void);
+int  waitfor(int);
+
+void execute(Word *, Word*);
+
+/* exec.c */
+// XXX: odd place for this
+int   count(Word *); 
+Word  *makeword(char *str, Word *link);
+void   freeword(Word *w);
+void   initpath(void);
+
+/* var.c */
+Var *var(char*);
+Var *definevar(char*, Var *);
+Var *globalvar(char*);
+Var *makevar(char *name, Var *link);
+void setvar(char *, Word *);
+char **mkenv(void);
+
+/* code.c */
+int   compile(Tree *);
+Code *copycode(Code *c);
+void  freecode(Code *c);
-- 
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