tPlan 9's rc. - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit f08fdedcee12c06e3ce9ac9bec363915978e8289
DIR parent 5993a8f2756bc455101a8c9ce95347d5050e7883
HTML Author: rsc <devnull@localhost>
Date: Sun, 23 Nov 2003 18:04:08 +0000
Plan 9's rc.
not a clear win over byron's,
but at least it has the right syntax.
Diffstat:
A src/cmd/rc/code.c | 430 +++++++++++++++++++++++++++++++
A src/cmd/rc/exec.c | 902 +++++++++++++++++++++++++++++++
A src/cmd/rc/exec.h | 71 +++++++++++++++++++++++++++++++
A src/cmd/rc/fmtquote.c | 162 ++++++++++++++++++++++++++++++
A src/cmd/rc/fns.h | 58 ++++++++++++++++++++++++++++++
A src/cmd/rc/getflags.c | 217 +++++++++++++++++++++++++++++++
A src/cmd/rc/getflags.h | 7 +++++++
A src/cmd/rc/glob.c | 211 +++++++++++++++++++++++++++++++
A src/cmd/rc/havefork.c | 212 ++++++++++++++++++++++++++++++
A src/cmd/rc/haventfork.c | 211 +++++++++++++++++++++++++++++++
A src/cmd/rc/here.c | 131 +++++++++++++++++++++++++++++++
A src/cmd/rc/io.c | 179 +++++++++++++++++++++++++++++++
A src/cmd/rc/io.h | 24 ++++++++++++++++++++++++
A src/cmd/rc/lex.c | 322 +++++++++++++++++++++++++++++++
A src/cmd/rc/mkfile | 39 +++++++++++++++++++++++++++++++
A src/cmd/rc/pcmd.c | 108 +++++++++++++++++++++++++++++++
A src/cmd/rc/pfnc.c | 67 +++++++++++++++++++++++++++++++
A src/cmd/rc/plan9ish.c | 480 +++++++++++++++++++++++++++++++
A src/cmd/rc/rc.h | 136 +++++++++++++++++++++++++++++++
A src/cmd/rc/simple.c | 443 +++++++++++++++++++++++++++++++
A src/cmd/rc/subr.c | 59 +++++++++++++++++++++++++++++++
A src/cmd/rc/trap.c | 34 +++++++++++++++++++++++++++++++
A src/cmd/rc/tree.c | 114 +++++++++++++++++++++++++++++++
A src/cmd/rc/var.c | 71 +++++++++++++++++++++++++++++++
24 files changed, 4688 insertions(+), 0 deletions(-)
---
DIR diff --git a/src/cmd/rc/code.c b/src/cmd/rc/code.c
t@@ -0,0 +1,430 @@
+#include "rc.h"
+#include "io.h"
+#include "exec.h"
+#include "fns.h"
+#include "getflags.h"
+#define c0 t->child[0]
+#define c1 t->child[1]
+#define c2 t->child[2]
+int codep, ncode;
+#define emitf(x) ((void)(codep!=ncode || morecode()), codebuf[codep].f=(x), codep++)
+#define emiti(x) ((void)(codep!=ncode || morecode()), codebuf[codep].i=(x), codep++)
+#define emits(x) ((void)(codep!=ncode || morecode()), codebuf[codep].s=(x), codep++)
+void stuffdot(int);
+char *fnstr(tree*);
+void outcode(tree*, int);
+void codeswitch(tree*, int);
+int iscase(tree*);
+code *codecopy(code*);
+void codefree(code*);
+int morecode(void){
+ ncode+=100;
+ codebuf=(code *)realloc((char *)codebuf, ncode*sizeof codebuf[0]);
+ if(codebuf==0) panic("Can't realloc %d bytes in morecode!",
+ ncode*sizeof codebuf[0]);
+ return 0;
+}
+void stuffdot(int a){
+ if(a<0 || codep<=a) panic("Bad address %d in stuffdot", a);
+ codebuf[a].i=codep;
+}
+int compile(tree *t)
+{
+ ncode=100;
+ codebuf=(code *)emalloc(ncode*sizeof codebuf[0]);
+ codep=0;
+ emiti(0); /* reference count */
+ outcode(t, flag['e']?1:0);
+ if(nerror){
+ efree((char *)codebuf);
+ return 0;
+ }
+ readhere();
+ emitf(Xreturn);
+ emitf(0);
+ return 1;
+}
+void cleanhere(char *f)
+{
+ emitf(Xdelhere);
+ emits(strdup(f));
+}
+char *fnstr(tree *t)
+{
+ io *f=openstr();
+ char *v;
+ extern char nl;
+ char svnl=nl;
+ nl=';';
+ pfmt(f, "%t", t);
+ nl=svnl;
+ v=f->strp;
+ f->strp=0;
+ closeio(f);
+ return v;
+}
+void outcode(tree *t, int eflag)
+{
+ int p, q;
+ tree *tt;
+ if(t==0) return;
+ if(t->type!=NOT && t->type!=';') runq->iflast=0;
+ switch(t->type){
+ default:
+ pfmt(err, "bad type %d in outcode\n", t->type);
+ break;
+ case '$':
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xdol);
+ break;
+ case '"':
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xqdol);
+ break;
+ case SUB:
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xmark);
+ outcode(c1, eflag);
+ emitf(Xsub);
+ break;
+ case '&':
+ emitf(Xasync);
+ p=emiti(0);
+ outcode(c0, eflag);
+ emitf(Xexit);
+ stuffdot(p);
+ break;
+ case ';':
+ outcode(c0, eflag);
+ outcode(c1, eflag);
+ break;
+ case '^':
+ emitf(Xmark);
+ outcode(c1, eflag);
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xconc);
+ break;
+ case '`':
+ emitf(Xbackq);
+ p=emiti(0);
+ outcode(c0, 0);
+ emitf(Xexit);
+ stuffdot(p);
+ break;
+ case ANDAND:
+ outcode(c0, 0);
+ emitf(Xtrue);
+ p=emiti(0);
+ outcode(c1, eflag);
+ stuffdot(p);
+ break;
+ case ARGLIST:
+ outcode(c1, eflag);
+ outcode(c0, eflag);
+ break;
+ case BANG:
+ outcode(c0, eflag);
+ emitf(Xbang);
+ break;
+ case PCMD:
+ case BRACE:
+ outcode(c0, eflag);
+ break;
+ case COUNT:
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xcount);
+ break;
+ case FN:
+ emitf(Xmark);
+ outcode(c0, eflag);
+ if(c1){
+ emitf(Xfn);
+ p=emiti(0);
+ emits(fnstr(c1));
+ outcode(c1, eflag);
+ emitf(Xunlocal); /* get rid of $* */
+ emitf(Xreturn);
+ stuffdot(p);
+ }
+ else
+ emitf(Xdelfn);
+ break;
+ case IF:
+ outcode(c0, 0);
+ emitf(Xif);
+ p=emiti(0);
+ outcode(c1, eflag);
+ emitf(Xwastrue);
+ stuffdot(p);
+ break;
+ case NOT:
+ if(!runq->iflast) yyerror("`if not' does not follow `if(...)'");
+ emitf(Xifnot);
+ p=emiti(0);
+ outcode(c0, eflag);
+ stuffdot(p);
+ break;
+ case OROR:
+ outcode(c0, 0);
+ emitf(Xfalse);
+ p=emiti(0);
+ outcode(c1, eflag);
+ stuffdot(p);
+ break;
+ case PAREN:
+ outcode(c0, eflag);
+ break;
+ case SIMPLE:
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xsimple);
+ if(eflag) emitf(Xeflag);
+ break;
+ case SUBSHELL:
+ emitf(Xsubshell);
+ p=emiti(0);
+ outcode(c0, eflag);
+ emitf(Xexit);
+ stuffdot(p);
+ if(eflag) emitf(Xeflag);
+ break;
+ case SWITCH:
+ codeswitch(t, eflag);
+ break;
+ case TWIDDLE:
+ emitf(Xmark);
+ outcode(c1, eflag);
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xmatch);
+ if(eflag) emitf(Xeflag);
+ break;
+ case WHILE:
+ q=codep;
+ outcode(c0, 0);
+ if(q==codep) emitf(Xsettrue); /* empty condition == while(true) */
+ emitf(Xtrue);
+ p=emiti(0);
+ outcode(c1, eflag);
+ emitf(Xjump);
+ emiti(q);
+ stuffdot(p);
+ break;
+ case WORDS:
+ outcode(c1, eflag);
+ outcode(c0, eflag);
+ break;
+ case FOR:
+ emitf(Xmark);
+ if(c1){
+ outcode(c1, eflag);
+ emitf(Xglob);
+ }
+ else{
+ emitf(Xmark);
+ emitf(Xword);
+ emits(strdup("*"));
+ emitf(Xdol);
+ }
+ emitf(Xmark); /* dummy value for Xlocal */
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xlocal);
+ p=emitf(Xfor);
+ q=emiti(0);
+ outcode(c2, eflag);
+ emitf(Xjump);
+ emiti(p);
+ stuffdot(q);
+ emitf(Xunlocal);
+ break;
+ case WORD:
+ emitf(Xword);
+ emits(strdup(t->str));
+ break;
+ case DUP:
+ if(t->rtype==DUPFD){
+ emitf(Xdup);
+ emiti(t->fd0);
+ emiti(t->fd1);
+ }
+ else{
+ emitf(Xclose);
+ emiti(t->fd0);
+ }
+ outcode(c1, eflag);
+ emitf(Xpopredir);
+ break;
+ case PIPEFD:
+ emitf(Xpipefd);
+ emiti(t->rtype);
+ p=emiti(0);
+ outcode(c0, eflag);
+ emitf(Xexit);
+ stuffdot(p);
+ break;
+ case REDIR:
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xglob);
+ switch(t->rtype){
+ case APPEND:
+ emitf(Xappend);
+ break;
+ case WRITE:
+ emitf(Xwrite);
+ break;
+ case READ:
+ case HERE:
+ emitf(Xread);
+ break;
+ }
+ emiti(t->fd0);
+ outcode(c1, eflag);
+ emitf(Xpopredir);
+ break;
+ case '=':
+ tt=t;
+ for(;t && t->type=='=';t=c2);
+ if(t){
+ for(t=tt;t->type=='=';t=c2){
+ emitf(Xmark);
+ outcode(c1, eflag);
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xlocal);
+ }
+ t=tt;
+ outcode(c2, eflag);
+ for(;t->type=='=';t=c2) emitf(Xunlocal);
+ }
+ else{
+ for(t=tt;t;t=c2){
+ emitf(Xmark);
+ outcode(c1, eflag);
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xassign);
+ }
+ }
+ t=tt; /* so tests below will work */
+ break;
+ case PIPE:
+ emitf(Xpipe);
+ emiti(t->fd0);
+ emiti(t->fd1);
+ p=emiti(0);
+ q=emiti(0);
+ outcode(c0, eflag);
+ emitf(Xexit);
+ stuffdot(p);
+ outcode(c1, eflag);
+ emitf(Xreturn);
+ stuffdot(q);
+ emitf(Xpipewait);
+ break;
+ }
+ if(t->type!=NOT && t->type!=';')
+ runq->iflast=t->type==IF;
+ else if(c0) runq->iflast=c0->type==IF;
+}
+/*
+ * switch code looks like this:
+ * Xmark
+ * (get switch value)
+ * Xjump 1f
+ * out: Xjump leave
+ * 1: Xmark
+ * (get case values)
+ * Xcase 1f
+ * (commands)
+ * Xjump out
+ * 1: Xmark
+ * (get case values)
+ * Xcase 1f
+ * (commands)
+ * Xjump out
+ * 1:
+ * leave:
+ * Xpopm
+ */
+void codeswitch(tree *t, int eflag)
+{
+ int leave; /* patch jump address to leave switch */
+ int out; /* jump here to leave switch */
+ int nextcase; /* patch jump address to next case */
+ tree *tt;
+ if(c1->child[0]==nil
+ || c1->child[0]->type!=';'
+ || !iscase(c1->child[0]->child[0])){
+ yyerror("case missing in switch");
+ return;
+ }
+ emitf(Xmark);
+ outcode(c0, eflag);
+ emitf(Xjump);
+ nextcase=emiti(0);
+ out=emitf(Xjump);
+ leave=emiti(0);
+ stuffdot(nextcase);
+ t=c1->child[0];
+ while(t->type==';'){
+ tt=c1;
+ emitf(Xmark);
+ for(t=c0->child[0];t->type==ARGLIST;t=c0) outcode(c1, eflag);
+ emitf(Xcase);
+ nextcase=emiti(0);
+ t=tt;
+ for(;;){
+ if(t->type==';'){
+ if(iscase(c0)) break;
+ outcode(c0, eflag);
+ t=c1;
+ }
+ else{
+ if(!iscase(t)) outcode(t, eflag);
+ break;
+ }
+ }
+ emitf(Xjump);
+ emiti(out);
+ stuffdot(nextcase);
+ }
+ stuffdot(leave);
+ emitf(Xpopm);
+}
+int iscase(tree *t)
+{
+ if(t->type!=SIMPLE) return 0;
+ do t=c0; while(t->type==ARGLIST);
+ return t->type==WORD && !t->quoted && strcmp(t->str, "case")==0;
+}
+code *codecopy(code *cp)
+{
+ cp[0].i++;
+ return cp;
+}
+void codefree(code *cp)
+{
+ code *p;
+ if(--cp[0].i!=0) return;
+ for(p=cp+1;p->f;p++){
+ if(p->f==Xappend || p->f==Xclose || p->f==Xread || p->f==Xwrite
+ || p->f==Xasync || p->f==Xbackq || p->f==Xcase || p->f==Xfalse
+ || p->f==Xfor || p->f==Xjump
+ || p->f==Xsubshell || p->f==Xtrue) p++;
+ else if(p->f==Xdup || p->f==Xpipefd) p+=2;
+ else if(p->f==Xpipe) p+=4;
+ else if(p->f==Xword || p->f==Xdelhere) efree((++p)->s);
+ else if(p->f==Xfn){
+ efree(p[2].s);
+ p+=2;
+ }
+ }
+ efree((char *)cp);
+}
DIR diff --git a/src/cmd/rc/exec.c b/src/cmd/rc/exec.c
t@@ -0,0 +1,902 @@
+#include "rc.h"
+#include "getflags.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+/*
+ * Start executing the given code at the given pc with the given redirection
+ */
+char *argv0="rc";
+void start(code *c, int pc, var *local)
+{
+ struct thread *p=new(struct thread);
+ p->code=codecopy(c);
+ p->pc=pc;
+ p->argv=0;
+ p->redir=p->startredir=runq?runq->redir:0;
+ p->local=local;
+ p->cmdfile=0;
+ p->cmdfd=0;
+ p->eof=0;
+ p->iflag=0;
+ p->lineno=1;
+ p->ret=runq;
+ runq=p;
+}
+word *newword(char *wd, word *next)
+{
+ word *p=new(word);
+ p->word=strdup(wd);
+ p->next=next;
+ return p;
+}
+void pushword(char *wd)
+{
+ if(runq->argv==0) panic("pushword but no argv!", 0);
+ runq->argv->words=newword(wd, runq->argv->words);
+}
+void popword(void){
+ word *p;
+ if(runq->argv==0) panic("popword but no argv!", 0);
+ p=runq->argv->words;
+ if(p==0) panic("popword but no word!", 0);
+ runq->argv->words=p->next;
+ efree(p->word);
+ efree((char *)p);
+}
+void freelist(word *w)
+{
+ word *nw;
+ while(w){
+ nw=w->next;
+ efree(w->word);
+ efree((char *)w);
+ w=nw;
+ }
+}
+void pushlist(void){
+ list *p=new(list);
+ p->next=runq->argv;
+ p->words=0;
+ runq->argv=p;
+}
+void poplist(void){
+ list *p=runq->argv;
+ if(p==0) panic("poplist but no argv", 0);
+ freelist(p->words);
+ runq->argv=p->next;
+ efree((char *)p);
+}
+int count(word *w)
+{
+ int n;
+ for(n=0;w;n++) w=w->next;
+ return n;
+}
+void pushredir(int type, int from, int to){
+ redir * rp=new(redir);
+ rp->type=type;
+ rp->from=from;
+ rp->to=to;
+ rp->next=runq->redir;
+ runq->redir=rp;
+}
+var *newvar(char *name, var *next)
+{
+ var *v=new(var);
+ v->name=name;
+ v->val=0;
+ v->fn=0;
+ v->changed=0;
+ v->fnchanged=0;
+ v->next=next;
+ return v;
+}
+/*
+ * get command line flags, initialize keywords & traps.
+ * get values from environment.
+ * set $pid, $cflag, $*
+ * fabricate bootstrap code and start it (*=(argv);. /usr/lib/rcmain $*)
+ * start interpreting code
+ */
+int
+main(int argc, char *argv[])
+{
+ code bootstrap[32];
+ char num[12], *rcmain;
+ int i;
+
+ argc=getflags(argc, argv, "srdiIlxepvVc:1m:1[command]", 1);
+ if(argc==-1) usage("[file [arg ...]]");
+ if(argv[0][0]=='-') flag['l']=flagset;
+ if(flag['I']) flag['i'] = 0;
+ else if(flag['i']==0 && argc==1 && Isatty(0)) flag['i'] = flagset;
+ rcmain=flag['m']?flag['m'][0]:Rcmain();
+ err=openfd(2);
+ kinit();
+ Trapinit();
+ Vinit();
+ itoa(num, mypid=getpid());
+ setvar("pid", newword(num, (word *)0));
+ setvar("cflag", flag['c']?newword(flag['c'][0], (word *)0)
+ :(word *)0);
+ setvar("rcname", newword(argv[0], (word *)0));
+ i=0;
+ bootstrap[i++].i=1;
+ bootstrap[i++].f=Xmark;
+ bootstrap[i++].f=Xword;
+ bootstrap[i++].s="*";
+ bootstrap[i++].f=Xassign;
+ bootstrap[i++].f=Xmark;
+ bootstrap[i++].f=Xmark;
+ bootstrap[i++].f=Xword;
+ bootstrap[i++].s="*";
+ bootstrap[i++].f=Xdol;
+ bootstrap[i++].f=Xword;
+ bootstrap[i++].s=rcmain;
+ bootstrap[i++].f=Xword;
+ bootstrap[i++].s=".";
+ bootstrap[i++].f=Xsimple;
+ bootstrap[i++].f=Xexit;
+ bootstrap[i].i=0;
+ start(bootstrap, 1, (var *)0);
+ /* prime bootstrap argv */
+ pushlist();
+ argv0 = strdup(argv[0]);
+ for(i=argc-1;i!=0;--i) pushword(argv[i]);
+ for(;;){
+ if(flag['r']) pfnc(err, runq);
+ runq->pc++;
+ (*runq->code[runq->pc-1].f)();
+ if(ntrap) dotrap();
+ }
+}
+/*
+ * Opcode routines
+ * Arguments on stack (...)
+ * Arguments in line [...]
+ * Code in line with jump around {...}
+ *
+ * Xappend(file)[fd] open file to append
+ * Xassign(name, val) assign val to name
+ * Xasync{... Xexit} make thread for {}, no wait
+ * Xbackq{... Xreturn} make thread for {}, push stdout
+ * Xbang complement condition
+ * Xcase(pat, value){...} exec code on match, leave (value) on
+ * stack
+ * Xclose[i] close file descriptor
+ * Xconc(left, right) concatenate, push results
+ * Xcount(name) push var count
+ * Xdelfn(name) delete function definition
+ * Xdeltraps(names) delete named traps
+ * Xdol(name) get variable value
+ * Xqdol(name) concatenate variable components
+ * Xdup[i j] dup file descriptor
+ * Xexit rc exits with status
+ * Xfalse{...} execute {} if false
+ * Xfn(name){... Xreturn} define function
+ * Xfor(var, list){... Xreturn} for loop
+ * Xjump[addr] goto
+ * Xlocal(name, val) create local variable, assign value
+ * Xmark mark stack
+ * Xmatch(pat, str) match pattern, set status
+ * Xpipe[i j]{... Xreturn}{... Xreturn} construct a pipe between 2 new threads,
+ * wait for both
+ * Xpipefd[type]{... Xreturn} connect {} to pipe (input or output,
+ * depending on type), push /dev/fd/??
+ * Xpopm(value) pop value from stack
+ * Xread(file)[fd] open file to read
+ * Xsettraps(names){... Xreturn} define trap functions
+ * Xshowtraps print trap list
+ * Xsimple(args) run command and wait
+ * Xreturn kill thread
+ * Xsubshell{... Xexit} execute {} in a subshell and wait
+ * Xtrue{...} execute {} if true
+ * Xunlocal delete local variable
+ * Xword[string] push string
+ * Xwrite(file)[fd] open file to write
+ */
+void Xappend(void){
+ char *file;
+ int f;
+ switch(count(runq->argv->words)){
+ default: Xerror1(">> requires singleton"); return;
+ case 0: Xerror1(">> requires file"); return;
+ case 1: break;
+ }
+ file=runq->argv->words->word;
+ if((f=open(file, 1))<0 && (f=Creat(file))<0){
+ pfmt(err, "%s: ", file);
+ Xerror("can't open");
+ return;
+ }
+ Seek(f, 0L, 2);
+ pushredir(ROPEN, f, runq->code[runq->pc].i);
+ runq->pc++;
+ poplist();
+}
+void Xasync(void){
+ int null=open("/dev/null", 0);
+ int pid;
+ char npid[10];
+ if(null<0){
+ Xerror("Can't open /dev/null\n");
+ return;
+ }
+ switch(pid=rfork(RFFDG|RFPROC|RFNOTEG)){
+ case -1:
+ close(null);
+ Xerror("try again");
+ break;
+ case 0:
+ pushredir(ROPEN, null, 0);
+ start(runq->code, runq->pc+1, runq->local);
+ runq->ret=0;
+ break;
+ default:
+ close(null);
+ runq->pc=runq->code[runq->pc].i;
+ itoa(npid, pid);
+ setvar("apid", newword(npid, (word *)0));
+ break;
+ }
+}
+void Xsettrue(void){
+ setstatus("");
+}
+void Xbang(void){
+ setstatus(truestatus()?"false":"");
+}
+void Xclose(void){
+ pushredir(RCLOSE, runq->code[runq->pc].i, 0);
+ runq->pc++;
+}
+void Xdup(void){
+ pushredir(RDUP, runq->code[runq->pc].i, runq->code[runq->pc+1].i);
+ runq->pc+=2;
+}
+void Xeflag(void){
+ if(eflagok && !truestatus()) Xexit();
+}
+void Xexit(void){
+ struct var *trapreq;
+ struct word *starval;
+ static int beenhere=0;
+ if(getpid()==mypid && !beenhere){
+ trapreq=vlook("sigexit");
+ if(trapreq->fn){
+ beenhere=1;
+ --runq->pc;
+ starval=vlook("*")->val;
+ start(trapreq->fn, trapreq->pc, (struct var *)0);
+ runq->local=newvar(strdup("*"), runq->local);
+ runq->local->val=copywords(starval, (struct word *)0);
+ runq->local->changed=1;
+ runq->redir=runq->startredir=0;
+ return;
+ }
+ }
+ Exit(getstatus());
+}
+void Xfalse(void){
+ if(truestatus()) runq->pc=runq->code[runq->pc].i;
+ else runq->pc++;
+}
+int ifnot; /* dynamic if not flag */
+void Xifnot(void){
+ if(ifnot)
+ runq->pc++;
+ else
+ runq->pc=runq->code[runq->pc].i;
+}
+void Xjump(void){
+ runq->pc=runq->code[runq->pc].i;
+}
+void Xmark(void){
+ pushlist();
+}
+void Xpopm(void){
+ poplist();
+}
+void Xread(void){
+ char *file;
+ int f;
+ switch(count(runq->argv->words)){
+ default: Xerror1("< requires singleton\n"); return;
+ case 0: Xerror1("< requires file\n"); return;
+ case 1: break;
+ }
+ file=runq->argv->words->word;
+ if((f=open(file, 0))<0){
+ pfmt(err, "%s: ", file);
+ Xerror("can't open");
+ return;
+ }
+ pushredir(ROPEN, f, runq->code[runq->pc].i);
+ runq->pc++;
+ poplist();
+}
+void turfredir(void){
+ while(runq->redir!=runq->startredir)
+ Xpopredir();
+}
+void Xpopredir(void){
+ struct redir *rp=runq->redir;
+ if(rp==0) panic("turfredir null!", 0);
+ runq->redir=rp->next;
+ if(rp->type==ROPEN) close(rp->from);
+ efree((char *)rp);
+}
+void Xreturn(void){
+ struct thread *p=runq;
+ turfredir();
+ while(p->argv) poplist();
+ codefree(p->code);
+ runq=p->ret;
+ efree((char *)p);
+ if(runq==0) Exit(getstatus());
+}
+void Xtrue(void){
+ if(truestatus()) runq->pc++;
+ else runq->pc=runq->code[runq->pc].i;
+}
+void Xif(void){
+ ifnot=1;
+ if(truestatus()) runq->pc++;
+ else runq->pc=runq->code[runq->pc].i;
+}
+void Xwastrue(void){
+ ifnot=0;
+}
+void Xword(void){
+ pushword(runq->code[runq->pc++].s);
+}
+void Xwrite(void){
+ char *file;
+ int f;
+ switch(count(runq->argv->words)){
+ default: Xerror1("> requires singleton\n"); return;
+ case 0: Xerror1("> requires file\n"); return;
+ case 1: break;
+ }
+ file=runq->argv->words->word;
+ if((f=Creat(file))<0){
+ pfmt(err, "%s: ", file);
+ Xerror("can't open");
+ return;
+ }
+ pushredir(ROPEN, f, runq->code[runq->pc].i);
+ runq->pc++;
+ poplist();
+}
+char *list2str(word *words){
+ char *value, *s, *t;
+ int len=0;
+ word *ap;
+ for(ap=words;ap;ap=ap->next)
+ len+=1+strlen(ap->word);
+ value=emalloc(len+1);
+ s=value;
+ for(ap=words;ap;ap=ap->next){
+ for(t=ap->word;*t;) *s++=*t++;
+ *s++=' ';
+ }
+ if(s==value) *s='\0';
+ else s[-1]='\0';
+ return value;
+}
+void Xmatch(void){
+ word *p;
+ char *subject;
+ subject=list2str(runq->argv->words);
+ setstatus("no match");
+ for(p=runq->argv->next->words;p;p=p->next)
+ if(match(subject, p->word, '\0')){
+ setstatus("");
+ break;
+ }
+ efree(subject);
+ poplist();
+ poplist();
+}
+void Xcase(void){
+ word *p;
+ char *s;
+ int ok=0;
+ s=list2str(runq->argv->next->words);
+ for(p=runq->argv->words;p;p=p->next){
+ if(match(s, p->word, '\0')){
+ ok=1;
+ break;
+ }
+ }
+ efree(s);
+ if(ok)
+ runq->pc++;
+ else
+ runq->pc=runq->code[runq->pc].i;
+ poplist();
+}
+word *conclist(word *lp, word *rp, word *tail)
+{
+ char *buf;
+ word *v;
+ if(lp->next || rp->next)
+ tail=conclist(lp->next==0?lp:lp->next, rp->next==0?rp:rp->next,
+ tail);
+ buf=emalloc(strlen(lp->word)+strlen(rp->word)+1);
+ strcpy(buf, lp->word);
+ strcat(buf, rp->word);
+ v=newword(buf, tail);
+ efree(buf);
+ return v;
+}
+void Xconc(void){
+ word *lp=runq->argv->words;
+ word *rp=runq->argv->next->words;
+ word *vp=runq->argv->next->next->words;
+ int lc=count(lp), rc=count(rp);
+ if(lc!=0 || rc!=0){
+ if(lc==0 || rc==0){
+ Xerror1("null list in concatenation");
+ return;
+ }
+ if(lc!=1 && rc!=1 && lc!=rc){
+ Xerror1("mismatched list lengths in concatenation");
+ return;
+ }
+ vp=conclist(lp, rp, vp);
+ }
+ poplist();
+ poplist();
+ runq->argv->words=vp;
+}
+void Xassign(void){
+ var *v;
+ if(count(runq->argv->words)!=1){
+ Xerror1("variable name not singleton!");
+ return;
+ }
+ deglob(runq->argv->words->word);
+ v=vlook(runq->argv->words->word);
+ poplist();
+ globlist();
+ freewords(v->val);
+ v->val=runq->argv->words;
+ v->changed=1;
+ runq->argv->words=0;
+ poplist();
+}
+/*
+ * copy arglist a, adding the copy to the front of tail
+ */
+word *copywords(word *a, word *tail)
+{
+ word *v=0, **end;
+ for(end=&v;a;a=a->next,end=&(*end)->next)
+ *end=newword(a->word, 0);
+ *end=tail;
+ return v;
+}
+void Xdol(void){
+ word *a, *star;
+ char *s, *t;
+ int n;
+ if(count(runq->argv->words)!=1){
+ Xerror1("variable name not singleton!");
+ return;
+ }
+ s=runq->argv->words->word;
+ deglob(s);
+ n=0;
+ for(t=s;'0'<=*t && *t<='9';t++) n=n*10+*t-'0';
+ a=runq->argv->next->words;
+ if(n==0 || *t)
+ a=copywords(vlook(s)->val, a);
+ else{
+ star=vlook("*")->val;
+ if(star && 1<=n && n<=count(star)){
+ while(--n) star=star->next;
+ a=newword(star->word, a);
+ }
+ }
+ poplist();
+ runq->argv->words=a;
+}
+void Xqdol(void){
+ word *a, *p;
+ char *s;
+ int n;
+ if(count(runq->argv->words)!=1){
+ Xerror1("variable name not singleton!");
+ return;
+ }
+ s=runq->argv->words->word;
+ deglob(s);
+ a=vlook(s)->val;
+ poplist();
+ n=count(a);
+ if(n==0){
+ pushword("");
+ return;
+ }
+ for(p=a;p;p=p->next) n+=strlen(p->word);
+ s=emalloc(n);
+ if(a){
+ strcpy(s, a->word);
+ for(p=a->next;p;p=p->next){
+ strcat(s, " ");
+ strcat(s, p->word);
+ }
+ }
+ else
+ s[0]='\0';
+ pushword(s);
+ efree(s);
+}
+word *subwords(word *val, int len, word *sub, word *a)
+{
+ int n;
+ char *s;
+ if(!sub) return a;
+ a=subwords(val, len, sub->next, a);
+ s=sub->word;
+ deglob(s);
+ n=0;
+ while('0'<=*s && *s<='9') n=n*10+ *s++ -'0';
+ if(n<1 || len<n) return a;
+ for(;n!=1;--n) val=val->next;
+ return newword(val->word, a);
+}
+void Xsub(void){
+ word *a, *v;
+ char *s;
+ if(count(runq->argv->next->words)!=1){
+ Xerror1("variable name not singleton!");
+ return;
+ }
+ s=runq->argv->next->words->word;
+ deglob(s);
+ a=runq->argv->next->next->words;
+ v=vlook(s)->val;
+ a=subwords(v, count(v), runq->argv->words, a);
+ poplist();
+ poplist();
+ runq->argv->words=a;
+}
+void Xcount(void){
+ word *a;
+ char *s, *t;
+ int n;
+ char num[12];
+ if(count(runq->argv->words)!=1){
+ Xerror1("variable name not singleton!");
+ return;
+ }
+ s=runq->argv->words->word;
+ deglob(s);
+ n=0;
+ for(t=s;'0'<=*t && *t<='9';t++) n=n*10+*t-'0';
+ if(n==0 || *t){
+ a=vlook(s)->val;
+ itoa(num, count(a));
+ }
+ else{
+ a=vlook("*")->val;
+ itoa(num, a && 1<=n && n<=count(a)?1:0);
+ }
+ poplist();
+ pushword(num);
+}
+void Xlocal(void){
+ if(count(runq->argv->words)!=1){
+ Xerror1("variable name must be singleton\n");
+ return;
+ }
+ deglob(runq->argv->words->word);
+ runq->local=newvar(strdup(runq->argv->words->word), runq->local);
+ runq->local->val=copywords(runq->argv->next->words, (word *)0);
+ runq->local->changed=1;
+ poplist();
+ poplist();
+}
+void Xunlocal(void){
+ var *v=runq->local, *hid;
+ if(v==0) panic("Xunlocal: no locals!", 0);
+ runq->local=v->next;
+ hid=vlook(v->name);
+ hid->changed=1;
+ efree(v->name);
+ freewords(v->val);
+ efree((char *)v);
+}
+void freewords(word *w)
+{
+ word *nw;
+ while(w){
+ efree(w->word);
+ nw=w->next;
+ efree((char *)w);
+ w=nw;
+ }
+}
+void Xfn(void){
+ var *v;
+ word *a;
+ int end;
+ end=runq->code[runq->pc].i;
+ for(a=runq->argv->words;a;a=a->next){
+ v=gvlook(a->word);
+ if(v->fn) codefree(v->fn);
+ v->fn=codecopy(runq->code);
+ v->pc=runq->pc+2;
+ v->fnchanged=1;
+ }
+ runq->pc=end;
+ poplist();
+}
+void Xdelfn(void){
+ var *v;
+ word *a;
+ for(a=runq->argv->words;a;a=a->next){
+ v=gvlook(a->word);
+ if(v->fn) codefree(v->fn);
+ v->fn=0;
+ v->fnchanged=1;
+ }
+ poplist();
+}
+void Xpipe(void){
+ struct thread *p=runq;
+ int pc=p->pc, forkid;
+ int lfd=p->code[pc++].i;
+ int rfd=p->code[pc++].i;
+ int pfd[2];
+ if(pipe(pfd)<0){
+ Xerror("can't get pipe");
+ return;
+ }
+ switch(forkid=fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(p->code, pc+2, runq->local);
+ runq->ret=0;
+ close(pfd[PRD]);
+ pushredir(ROPEN, pfd[PWR], lfd);
+ break;
+ default:
+ start(p->code, p->code[pc].i, runq->local);
+ close(pfd[PWR]);
+ pushredir(ROPEN, pfd[PRD], rfd);
+ p->pc=p->code[pc+1].i;
+ p->pid=forkid;
+ break;
+ }
+}
+char *concstatus(char *s, char *t)
+{
+ static char v[NSTATUS+1];
+ int n=strlen(s);
+ strncpy(v, s, NSTATUS);
+ if(n<NSTATUS){
+ v[n]='|';
+ strncpy(v+n+1, t, NSTATUS-n-1);
+ }
+ v[NSTATUS]='\0';
+ return v;
+}
+void Xpipewait(void){
+ char status[NSTATUS+1];
+ if(runq->pid==-1)
+ setstatus(concstatus(runq->status, getstatus()));
+ else{
+ strncpy(status, getstatus(), NSTATUS);
+ status[NSTATUS]='\0';
+ Waitfor(runq->pid, 1);
+ runq->pid=-1;
+ setstatus(concstatus(getstatus(), status));
+ }
+}
+void Xrdcmds(void){
+ struct thread *p=runq;
+ word *prompt;
+ flush(err);
+ nerror=0;
+ if(flag['s'] && !truestatus())
+ pfmt(err, "status=%v\n", vlook("status")->val);
+ if(runq->iflag){
+ prompt=vlook("prompt")->val;
+ if(prompt)
+ promptstr=prompt->word;
+ else
+ promptstr="% ";
+ }
+ Noerror();
+ if(yyparse()){
+ if(!p->iflag || p->eof && !Eintr()){
+ if(p->cmdfile) efree(p->cmdfile);
+ closeio(p->cmdfd);
+ Xreturn(); /* should this be omitted? */
+ }
+ else{
+ if(Eintr()){
+ pchr(err, '\n');
+ p->eof=0;
+ }
+ --p->pc; /* go back for next command */
+ }
+ }
+ else{
+ ntrap = 0; /* avoid double-interrupts during blocked writes */
+ --p->pc; /* re-execute Xrdcmds after codebuf runs */
+ start(codebuf, 1, runq->local);
+ }
+ freenodes();
+}
+void Xerror(char *s)
+{
+ if(strcmp(argv0, "rc")==0 || strcmp(argv0, "/bin/rc")==0)
+ pfmt(err, "rc: %s: %r\n", s);
+ else
+ pfmt(err, "rc (%s): %s: %r\n", argv0, s);
+ flush(err);
+ while(!runq->iflag) Xreturn();
+}
+void Xerror1(char *s)
+{
+ if(strcmp(argv0, "rc")==0 || strcmp(argv0, "/bin/rc")==0)
+ pfmt(err, "rc: %s\n", s);
+ else
+ pfmt(err, "rc (%s): %s\n", argv0, s);
+ flush(err);
+ while(!runq->iflag) Xreturn();
+}
+void Xbackq(void){
+ char wd[8193];
+ int c;
+ char *s, *ewd=&wd[8192], *stop;
+ struct io *f;
+ var *ifs=vlook("ifs");
+ word *v, *nextv;
+ int pfd[2];
+ int pid;
+ stop=ifs->val?ifs->val->word:"";
+ if(pipe(pfd)<0){
+ Xerror("can't make pipe");
+ return;
+ }
+ switch(pid=fork()){
+ case -1: Xerror("try again");
+ close(pfd[PRD]);
+ close(pfd[PWR]);
+ return;
+ case 0:
+ close(pfd[PRD]);
+ start(runq->code, runq->pc+1, runq->local);
+ pushredir(ROPEN, pfd[PWR], 1);
+ return;
+ default:
+ close(pfd[PWR]);
+ f=openfd(pfd[PRD]);
+ s=wd;
+ v=0;
+ while((c=rchr(f))!=EOF){
+ if(strchr(stop, c) || s==ewd){
+ if(s!=wd){
+ *s='\0';
+ v=newword(wd, v);
+ s=wd;
+ }
+ }
+ else *s++=c;
+ }
+ if(s!=wd){
+ *s='\0';
+ v=newword(wd, v);
+ }
+ closeio(f);
+ Waitfor(pid, 0);
+ /* v points to reversed arglist -- reverse it onto argv */
+ while(v){
+ nextv=v->next;
+ v->next=runq->argv->words;
+ runq->argv->words=v;
+ v=nextv;
+ }
+ runq->pc=runq->code[runq->pc].i;
+ return;
+ }
+}
+/*
+ * Who should wait for the exit from the fork?
+ */
+void Xpipefd(void){
+ struct thread *p=runq;
+ int pc=p->pc;
+ char name[40];
+ int pfd[2];
+ int sidefd, mainfd;
+ if(pipe(pfd)<0){
+ Xerror("can't get pipe");
+ return;
+ }
+ if(p->code[pc].i==READ){
+ sidefd=pfd[PWR];
+ mainfd=pfd[PRD];
+ }
+ else{
+ sidefd=pfd[PRD];
+ mainfd=pfd[PWR];
+ }
+ switch(fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(p->code, pc+2, runq->local);
+ close(mainfd);
+ pushredir(ROPEN, sidefd, p->code[pc].i==READ?1:0);
+ runq->ret=0;
+ break;
+ default:
+ close(sidefd);
+ pushredir(ROPEN, mainfd, mainfd); /* isn't this a noop? */
+ strcpy(name, Fdprefix);
+ itoa(name+strlen(name), mainfd);
+ pushword(name);
+ p->pc=p->code[pc+1].i;
+ break;
+ }
+}
+void Xsubshell(void){
+ int pid;
+ switch(pid=fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(runq->code, runq->pc+1, runq->local);
+ runq->ret=0;
+ break;
+ default:
+ Waitfor(pid, 1);
+ runq->pc=runq->code[runq->pc].i;
+ break;
+ }
+}
+void setstatus(char *s)
+{
+ setvar("status", newword(s, (word *)0));
+}
+char *getstatus(void){
+ var *status=vlook("status");
+ return status->val?status->val->word:"";
+}
+int truestatus(void){
+ char *s;
+ for(s=getstatus();*s;s++)
+ if(*s!='|' && *s!='0') return 0;
+ return 1;
+}
+void Xdelhere(void){
+ Unlink(runq->code[runq->pc++].s);
+}
+void Xfor(void){
+ if(runq->argv->words==0){
+ poplist();
+ runq->pc=runq->code[runq->pc].i;
+ }
+ else{
+ freelist(runq->local->val);
+ runq->local->val=runq->argv->words;
+ runq->local->changed=1;
+ runq->argv->words=runq->argv->words->next;
+ runq->local->val->next=0;
+ runq->pc++;
+ }
+}
+void Xglob(void){
+ globlist();
+}
DIR diff --git a/src/cmd/rc/exec.h b/src/cmd/rc/exec.h
t@@ -0,0 +1,71 @@
+/*
+ * Definitions used in the interpreter
+ */
+extern void Xappend(void), Xasync(void), Xbackq(void), Xbang(void), Xclose(void);
+extern void Xconc(void), Xcount(void), Xdelfn(void), Xdol(void), Xqdol(void), Xdup(void);
+extern void Xexit(void), Xfalse(void), Xfn(void), Xfor(void), Xglob(void);
+extern void Xjump(void), Xmark(void), Xmatch(void), Xpipe(void), Xread(void);
+extern void Xrdfn(void), Xunredir(void), Xstar(void), Xreturn(void), Xsubshell(void);
+extern void Xtrue(void), Xword(void), Xwrite(void), Xpipefd(void), Xcase(void);
+extern void Xlocal(void), Xunlocal(void), Xassign(void), Xsimple(void), Xpopm(void);
+extern void Xrdcmds(void), Xwastrue(void), Xif(void), Xifnot(void), Xpipewait(void);
+extern void Xdelhere(void), Xpopredir(void), Xsub(void), Xeflag(void), Xsettrue(void);
+extern void Xerror(char*);
+extern void Xerror1(char*);
+/*
+ * word lists are in correct order,
+ * i.e. word0->word1->word2->word3->0
+ */
+struct word{
+ char *word;
+ word *next;
+};
+struct list{
+ word *words;
+ list *next;
+};
+word *newword(char *, word *), *copywords(word *, word *);
+struct redir{
+ char type; /* what to do */
+ short from, to; /* what to do it to */
+ struct redir *next; /* what else to do (reverse order) */
+};
+#define NSTATUS ERRMAX /* length of status (from plan 9) */
+/*
+ * redir types
+ */
+#define ROPEN 1 /* dup2(from, to); close(from); */
+#define RDUP 2 /* dup2(from, to); */
+#define RCLOSE 3 /* close(from); */
+struct thread{
+ union code *code; /* code for this thread */
+ int pc; /* code[pc] is the next instruction */
+ struct list *argv; /* argument stack */
+ struct redir *redir; /* redirection stack */
+ struct redir *startredir; /* redir inheritance point */
+ struct var *local; /* list of local variables */
+ char *cmdfile; /* file name in Xrdcmd */
+ struct io *cmdfd; /* file descriptor for Xrdcmd */
+ int iflast; /* static `if not' checking */
+ int eof; /* is cmdfd at eof? */
+ int iflag; /* interactive? */
+ int lineno; /* linenumber */
+ int pid; /* process for Xpipewait to wait for */
+ char status[NSTATUS]; /* status for Xpipewait */
+ tree *treenodes; /* tree nodes created by this process */
+ thread *ret; /* who continues when this finishes */
+};
+thread *runq;
+code *codecopy(code*);
+code *codebuf; /* compiler output */
+int ntrap; /* number of outstanding traps */
+int trap[NSIG]; /* number of outstanding traps per type */
+extern struct builtin{
+ char *name;
+ void (*fnc)(void);
+}Builtin[];
+int eflagok; /* kludge flag so that -e doesn't exit in startup */
+void execcd(void), execwhatis(void), execeval(void), execexec(void);
+void execexit(void), execshift(void);
+void execwait(void), execumask(void), execdot(void), execflag(void);
+void execfunc(var*), execcmds(io *);
DIR diff --git a/src/cmd/rc/fmtquote.c b/src/cmd/rc/fmtquote.c
t@@ -0,0 +1,162 @@
+/*
+ * The authors of this software are Rob Pike and Ken Thompson.
+ * Copyright (c) 2002 by Lucent Technologies.
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose without fee is hereby granted, provided that this entire notice
+ * is included in all copies of any software which is or includes a copy
+ * or modification of this software and in all copies of the supporting
+ * documentation for such software.
+ * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
+ * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
+ * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
+ */
+#include <u.h>
+#include <libc.h>
+#include "fmt.h"
+#include "fmtdef.h"
+
+extern int (*doquote)(int);
+
+/*
+ * How many bytes of output UTF will be produced by quoting (if necessary) this string?
+ * How many runes? How much of the input will be consumed?
+ * The parameter q is filled in by _quotesetup.
+ * The string may be UTF or Runes (s or r).
+ * Return count does not include NUL.
+ * Terminate the scan at the first of:
+ * NUL in input
+ * count exceeded in input
+ * count exceeded on output
+ * *ninp is set to number of input bytes accepted.
+ * nin may be <0 initially, to avoid checking input by count.
+ */
+void
+__quotesetup(char *s, int nin, int nout, Quoteinfo *q, int sharp)
+{
+ int c;
+
+ q->quoted = 0;
+ q->nbytesout = 0;
+ q->nrunesout = 0;
+ q->nbytesin = 0;
+ q->nrunesin = 0;
+ if(sharp || nin==0 || *s=='\0'){
+ if(nout < 2)
+ return;
+ q->quoted = 1;
+ q->nbytesout = 2;
+ q->nrunesout = 2;
+ }
+ for(; nin!=0; nin-=1){
+ c = *s;
+
+ if(c == '\0')
+ break;
+ if(q->nrunesout+1 > nout)
+ break;
+
+ if((c <= L' ') || (c == L'\'') || (doquote!=nil && doquote(c))){
+ if(!q->quoted){
+ if(1+q->nrunesout+1+1 > nout) /* no room for quotes */
+ break;
+ q->nrunesout += 2; /* include quotes */
+ q->nbytesout += 2; /* include quotes */
+ q->quoted = 1;
+ }
+ if(c == '\'') {
+ q->nbytesout++;
+ q->nrunesout++; /* quotes reproduce as two characters */
+ }
+ }
+
+ /* advance input */
+ s++;
+ q->nbytesin++;
+ q->nrunesin++;
+
+ /* advance output */
+ q->nbytesout++;
+ q->nrunesout++;
+ }
+}
+
+static int
+qstrfmt(char *sin, Quoteinfo *q, Fmt *f)
+{
+ int r;
+ char *t, *s, *m, *me;
+ ulong fl;
+ int nc, w;
+
+ m = sin;
+ me = m + q->nbytesin;
+
+ w = f->width;
+ fl = f->flags;
+ if(!(fl & FmtLeft) && __fmtpad(f, w - q->nbytesout) < 0)
+ return -1;
+ t = f->to;
+ s = f->stop;
+ FMTCHAR(f, t, s, '\'');
+ for(nc = q->nrunesin; nc > 0; nc--){
+ r = *(uchar*)m++;
+ FMTCHAR(f, t, s, r);
+ if(r == '\'')
+ FMTCHAR(f, t, s, r);
+ }
+
+ FMTCHAR(f, t, s, '\'');
+ f->nfmt += t - (char *)f->to;
+ f->to = t;
+ if(fl & FmtLeft && __fmtpad(f, w - q->nbytesout) < 0)
+ return -1;
+ return 0;
+}
+
+int
+__quotestrfmt(int runesin, Fmt *f)
+{
+ int outlen;
+ char *s;
+ Quoteinfo q;
+
+ f->flags &= ~FmtPrec; /* ignored for %q %Q, so disable for %s %S in easy case */
+ s = va_arg(f->args, char *);
+ if(!s)
+ return __fmtcpy(f, "<nil>", 5, 5);
+
+ if(f->flush)
+ outlen = 0x7FFFFFFF; /* if we can flush, no output limit */
+ else
+ outlen = (char*)f->stop - (char*)f->to;
+
+ __quotesetup(s, -1, outlen, &q, f->flags&FmtSharp);
+
+ if(!q.quoted)
+ return __fmtcpy(f, s, q.nrunesin, q.nbytesin);
+ return qstrfmt(s, &q, f);
+}
+
+int
+quotestrfmt(Fmt *f)
+{
+ return __quotestrfmt(0, f);
+}
+
+void
+quotefmtinstall(void)
+{
+ fmtinstall('q', quotestrfmt);
+}
+
+int
+__needsquotes(char *s, int *quotelenp)
+{
+ Quoteinfo q;
+
+ __quotesetup(s, -1, 0x7FFFFFFF, &q, 0);
+ *quotelenp = q.nbytesout;
+
+ return q.quoted;
+}
DIR diff --git a/src/cmd/rc/fns.h b/src/cmd/rc/fns.h
t@@ -0,0 +1,58 @@
+void Abort(void);
+void Closedir(int);
+int Creat(char*);
+int Dup(int, int);
+int Dup1(int);
+int Eintr(void);
+int Executable(char*);
+void Execute(word*, word*);
+void Exit(char*);
+int Globsize(char*);
+int Isatty(int);
+void Memcpy(char*, char*, long);
+void Noerror(void);
+int Opendir(char*);
+long Read(int, char*, long);
+int Readdir(int, char*);
+long Seek(int, long, long);
+void Trapinit(void);
+void Unlink(char*);
+void Updenv(void);
+void Vinit(void);
+int Waitfor(int, int);
+long Write(int, char*, long);
+int advance(void);
+int back(int);
+void cleanhere(char*);
+void codefree(code*);
+int compile(tree*);
+char * list2str(word*);
+int count(word*);
+void deglob(char*);
+void dotrap(void);
+void freenodes(void);
+void freewords(word*);
+void globlist(void);
+int idchr(int);
+void itoa(char*, long);
+void kinit(void);
+int match(char*, char*, int);
+int matchfn(char*, char*);
+void panic(char*, int);
+void poplist(void);
+void popword(void);
+void pprompt(void);
+void pushlist(void);
+void pushredir(int, int, int);
+void pushword(char*);
+void readhere(void);
+void setstatus(char*);
+void setvar(char*, word*);
+void skipnl(void);
+void start(code*, int, var*);
+int truestatus(void);
+void usage(char*);
+int wordchr(int);
+void yyerror(char*);
+int yylex(void);
+int yyparse(void);
DIR diff --git a/src/cmd/rc/getflags.c b/src/cmd/rc/getflags.c
t@@ -0,0 +1,217 @@
+/*% cyntax -DTEST % && cc -DTEST -go # %
+ */
+#include "rc.h"
+#include "getflags.h"
+#include "fns.h"
+char *flagset[]={"<flag>"};
+char **flag[NFLAG];
+char cmdline[NCMDLINE+1];
+char *cmdname;
+static char *flagarg="";
+static void reverse(char**, char**);
+static int scanflag(int, char*);
+static void errn(char*, int);
+static void errs(char*);
+static void errc(int);
+static int reason;
+#define RESET 1
+#define FEWARGS 2
+#define FLAGSYN 3
+#define BADFLAG 4
+static int badflag;
+int getflags(int argc, char *argv[], char *flags, int stop)
+{
+ char *s, *t;
+ int i, j, c, count;
+ flagarg=flags;
+ if(cmdname==0) cmdname=argv[0];
+ s=cmdline;
+ for(i=0;i!=argc;i++){
+ for(t=argv[i];*t;t++)
+ if(s!=&cmdline[NCMDLINE])
+ *s++=*t;
+ if(i!=argc-1 && s!=&cmdline[NCMDLINE])
+ *s++=' ';
+ }
+ *s='\0';
+ i=1;
+ while(i!=argc){
+ if(argv[i][0]!='-' || argv[i][1]=='\0'){
+ if(stop) return argc;
+ i++;
+ continue;
+ }
+ s=argv[i]+1;
+ while(*s){
+ c=*s++;
+ count=scanflag(c, flags);
+ if(count==-1) return -1;
+ if(flag[c]){ reason=RESET; badflag=c; return -1; }
+ if(count==0){
+ flag[c]=flagset;
+ if(*s=='\0'){
+ for(j=i+1;j<=argc;j++)
+ argv[j-1]=argv[j];
+ --argc;
+ }
+ }
+ else{
+ if(*s=='\0'){
+ for(j=i+1;j<=argc;j++)
+ argv[j-1]=argv[j];
+ --argc;
+ s=argv[i];
+ }
+ if(argc-i<count){
+ reason=FEWARGS;
+ badflag=c;
+ return -1;
+ }
+ reverse(argv+i, argv+argc);
+ reverse(argv+i, argv+argc-count);
+ reverse(argv+argc-count+1, argv+argc);
+ argc-=count;
+ flag[c]=argv+argc+1;
+ flag[c][0]=s;
+ s="";
+ }
+ }
+ }
+ return argc;
+}
+static void reverse(char **p, char **q)
+{
+ char *t;
+ for(;p<q;p++,--q){ t=*p; *p=*q; *q=t; }
+}
+static int scanflag(int c, char *f)
+{
+ int fc, count;
+ if(0<=c && c<NFLAG) while(*f){
+ if(*f==' '){
+ f++;
+ continue;
+ }
+ fc=*f++;
+ if(*f==':'){
+ f++;
+ if(*f<'0' || '9'<*f){ reason=FLAGSYN; return -1; }
+ count=0;
+ while('0'<=*f && *f<='9') count=count*10+*f++-'0';
+ }
+ else
+ count=0;
+ if(*f=='['){
+ do{
+ f++;
+ if(*f=='\0'){ reason=FLAGSYN; return -1; }
+ }while(*f!=']');
+ f++;
+ }
+ if(c==fc) return count;
+ }
+ reason=BADFLAG;
+ badflag=c;
+ return -1;
+}
+void usage(char *tail)
+{
+ char *s, *t, c;
+ int count, nflag=0;
+ switch(reason){
+ case RESET:
+ errs("Flag -");
+ errc(badflag);
+ errs(": set twice\n");
+ break;
+ case FEWARGS:
+ errs("Flag -");
+ errc(badflag);
+ errs(": too few arguments\n");
+ break;
+ case FLAGSYN:
+ errs("Bad argument to getflags!\n");
+ break;
+ case BADFLAG:
+ errs("Illegal flag -");
+ errc(badflag);
+ errc('\n');
+ break;
+ }
+ errs("Usage: ");
+ errs(cmdname);
+ for(s=flagarg;*s;){
+ c=*s;
+ if(*s++==' ') continue;
+ if(*s==':'){
+ s++;
+ count=0;
+ while('0'<=*s && *s<='9') count=count*10+*s++-'0';
+ }
+ else count=0;
+ if(count==0){
+ if(nflag==0) errs(" [-");
+ nflag++;
+ errc(c);
+ }
+ if(*s=='['){
+ s++;
+ while(*s!=']' && *s!='\0') s++;
+ if(*s==']') s++;
+ }
+ }
+ if(nflag) errs("]");
+ for(s=flagarg;*s;){
+ c=*s;
+ if(*s++==' ') continue;
+ if(*s==':'){
+ s++;
+ count=0;
+ while('0'<=*s && *s<='9') count=count*10+*s++-'0';
+ }
+ else count=0;
+ if(count!=0){
+ errs(" [-");
+ errc(c);
+ if(*s=='['){
+ s++;
+ t=s;
+ while(*s!=']' && *s!='\0') s++;
+ errs(" ");
+ errn(t, s-t);
+ if(*s==']') s++;
+ }
+ else
+ while(count--) errs(" arg");
+ errs("]");
+ }
+ else if(*s=='['){
+ s++;
+ while(*s!=']' && *s!='\0') s++;
+ if(*s==']') s++;
+ }
+ }
+ if(tail){
+ errs(" ");
+ errs(tail);
+ }
+ errs("\n");
+ Exit("bad flags");
+}
+static void errn(char *s, int count)
+{
+ while(count){ errc(*s++); --count; }
+}
+static void errs(char *s)
+{
+ while(*s) errc(*s++);
+}
+#define NBUF 80
+static char buf[NBUF], *bufp=buf;
+static void errc(int c){
+ *bufp++=c;
+ if(bufp==&buf[NBUF] || c=='\n'){
+ Write(2, buf, bufp-buf);
+ bufp=buf;
+ }
+}
DIR diff --git a/src/cmd/rc/getflags.h b/src/cmd/rc/getflags.h
t@@ -0,0 +1,7 @@
+#define NFLAG 128
+#define NCMDLINE 512
+extern char **flag[NFLAG];
+extern char cmdline[NCMDLINE+1];
+extern char *cmdname;
+extern char *flagset[];
+int getflags(int, char*[], char*, int);
DIR diff --git a/src/cmd/rc/glob.c b/src/cmd/rc/glob.c
t@@ -0,0 +1,211 @@
+#include "rc.h"
+#include "exec.h"
+#include "fns.h"
+char *globname;
+struct word *globv;
+/*
+ * delete all the GLOB marks from s, in place
+ */
+void deglob(char *s)
+{
+ char *t=s;
+ do{
+ if(*t==GLOB) t++;
+ *s++=*t;
+ }while(*t++);
+}
+int globcmp(const void *s, const void *t)
+{
+ return strcmp(*(char**)s, *(char**)t);
+}
+void globsort(word *left, word *right)
+{
+ char **list;
+ word *a;
+ int n=0;
+ for(a=left;a!=right;a=a->next) n++;
+ list=(char **)emalloc(n*sizeof(char *));
+ for(a=left,n=0;a!=right;a=a->next,n++) list[n]=a->word;
+ qsort((char *)list, n, sizeof(char *), globcmp);
+ for(a=left,n=0;a!=right;a=a->next,n++) a->word=list[n];
+ efree((char *)list);
+}
+/*
+ * Push names prefixed by globname and suffixed by a match of p onto the astack.
+ * namep points to the end of the prefix in globname.
+ */
+void globdir(char *p, char *namep)
+{
+ char *t, *newp;
+ int f;
+ /* scan the pattern looking for a component with a metacharacter in it */
+ if(*p=='\0'){
+ globv=newword(globname, globv);
+ return;
+ }
+ t=namep;
+ newp=p;
+ while(*newp){
+ if(*newp==GLOB)
+ break;
+ *t=*newp++;
+ if(*t++=='/'){
+ namep=t;
+ p=newp;
+ }
+ }
+ /* If we ran out of pattern, append the name if accessible */
+ if(*newp=='\0'){
+ *t='\0';
+ if(access(globname, 0)==0)
+ globv=newword(globname, globv);
+ return;
+ }
+ /* read the directory and recur for any entry that matches */
+ *namep='\0';
+ if((f=Opendir(globname[0]?globname:"."))<0) return;
+ while(*newp!='/' && *newp!='\0') newp++;
+ while(Readdir(f, namep)){
+ if(matchfn(namep, p)){
+ for(t=namep;*t;t++);
+ globdir(newp, t);
+ }
+ }
+ Closedir(f);
+}
+/*
+ * Push all file names matched by p on the current thread's stack.
+ * If there are no matches, the list consists of p.
+ */
+void glob(char *p)
+{
+ word *svglobv=globv;
+ int globlen=Globsize(p);
+ if(!globlen){
+ deglob(p);
+ globv=newword(p, globv);
+ return;
+ }
+ globname=emalloc(globlen);
+ globname[0]='\0';
+ globdir(p, globname);
+ efree(globname);
+ if(svglobv==globv){
+ deglob(p);
+ globv=newword(p, globv);
+ }
+ else
+ globsort(globv, svglobv);
+}
+/*
+ * Do p and q point at equal utf codes
+ */
+int equtf(char *p, char *q){
+ if(*p!=*q) return 0;
+ if(twobyte(*p)) return p[1]==q[1];
+ if(threebyte(*p)){
+ if(p[1]!=q[1]) return 0;
+ if(p[1]=='\0') return 1; /* broken code at end of string! */
+ return p[2]==q[2];
+ }
+ return 1;
+}
+/*
+ * Return a pointer to the next utf code in the string,
+ * not jumping past nuls in broken utf codes!
+ */
+char *nextutf(char *p){
+ if(twobyte(*p)) return p[1]=='\0'?p+1:p+2;
+ if(threebyte(*p)) return p[1]=='\0'?p+1:p[2]=='\0'?p+2:p+3;
+ return p+1;
+}
+/*
+ * Convert the utf code at *p to a unicode value
+ */
+int unicode(char *p){
+ int u=*p&0xff;
+ if(twobyte(u)) return ((u&0x1f)<<6)|(p[1]&0x3f);
+ if(threebyte(u)) return (u<<12)|((p[1]&0x3f)<<6)|(p[2]&0x3f);
+ return u;
+}
+/*
+ * Does the string s match the pattern p
+ * . and .. are only matched by patterns starting with .
+ * * matches any sequence of characters
+ * ? matches any single character
+ * [...] matches the enclosed list of characters
+ */
+int matchfn(char *s, char *p)
+{
+ if(s[0]=='.' && (s[1]=='\0' || s[1]=='.' && s[2]=='\0') && p[0]!='.')
+ return 0;
+ return match(s, p, '/');
+}
+int match(char *s, char *p, int stop)
+{
+ int compl, hit, lo, hi, t, c;
+ for(;*p!=stop && *p!='\0';s=nextutf(s),p=nextutf(p)){
+ if(*p!=GLOB){
+ if(!equtf(p, s)) return 0;
+ }
+ else switch(*++p){
+ case GLOB:
+ if(*s!=GLOB) return 0;
+ break;
+ case '*':
+ for(;;){
+ if(match(s, nextutf(p), stop)) return 1;
+ if(!*s) break;
+ s=nextutf(s);
+ }
+ return 0;
+ case '?':
+ if(*s=='\0') return 0;
+ break;
+ case '[':
+ if(*s=='\0') return 0;
+ c=unicode(s);
+ p++;
+ compl=*p=='~';
+ if(compl) p++;
+ hit=0;
+ while(*p!=']'){
+ if(*p=='\0') return 0; /* syntax error */
+ lo=unicode(p);
+ p=nextutf(p);
+ if(*p!='-') hi=lo;
+ else{
+ p++;
+ if(*p=='\0') return 0; /* syntax error */
+ hi=unicode(p);
+ p=nextutf(p);
+ if(hi<lo){ t=lo; lo=hi; hi=t; }
+ }
+ if(lo<=c && c<=hi) hit=1;
+ }
+ if(compl) hit=!hit;
+ if(!hit) return 0;
+ break;
+ }
+ }
+ return *s=='\0';
+}
+void globlist1(word *gl)
+{
+ if(gl){
+ globlist1(gl->next);
+ glob(gl->word);
+ }
+}
+void globlist(void){
+ word *a;
+ globv=0;
+ globlist1(runq->argv->words);
+ poplist();
+ pushlist();
+ if(globv){
+ for(a=globv;a->next;a=a->next);
+ a->next=runq->argv->words;
+ runq->argv->words=globv;
+ }
+}
DIR diff --git a/src/cmd/rc/havefork.c b/src/cmd/rc/havefork.c
t@@ -0,0 +1,212 @@
+#include "rc.h"
+#include "getflags.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+
+int havefork = 1;
+
+void
+Xasync(void)
+{
+ int null = open("/dev/null", 0);
+ int pid;
+ char npid[10];
+ if(null<0){
+ Xerror("Can't open /dev/null\n");
+ return;
+ }
+ switch(pid = rfork(RFFDG|RFPROC|RFNOTEG)){
+ case -1:
+ close(null);
+ Xerror("try again");
+ break;
+ case 0:
+ pushredir(ROPEN, null, 0);
+ start(runq->code, runq->pc+1, runq->local);
+ runq->ret = 0;
+ break;
+ default:
+ close(null);
+ runq->pc = runq->code[runq->pc].i;
+ inttoascii(npid, pid);
+ setvar("apid", newword(npid, (word *)0));
+ break;
+ }
+}
+
+void
+Xpipe(void)
+{
+ struct thread *p = runq;
+ int pc = p->pc, forkid;
+ int lfd = p->code[pc++].i;
+ int rfd = p->code[pc++].i;
+ int pfd[2];
+ if(pipe(pfd)<0){
+ Xerror("can't get pipe");
+ return;
+ }
+ switch(forkid = fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(p->code, pc+2, runq->local);
+ runq->ret = 0;
+ close(pfd[PRD]);
+ pushredir(ROPEN, pfd[PWR], lfd);
+ break;
+ default:
+ start(p->code, p->code[pc].i, runq->local);
+ close(pfd[PWR]);
+ pushredir(ROPEN, pfd[PRD], rfd);
+ p->pc = p->code[pc+1].i;
+ p->pid = forkid;
+ break;
+ }
+}
+
+/*
+ * Who should wait for the exit from the fork?
+ */
+void
+Xbackq(void)
+{
+ char wd[8193];
+ int c;
+ char *s, *ewd=&wd[8192], *stop;
+ struct io *f;
+ var *ifs = vlook("ifs");
+ word *v, *nextv;
+ int pfd[2];
+ int pid;
+ stop = ifs->val?ifs->val->word:"";
+ if(pipe(pfd)<0){
+ Xerror("can't make pipe");
+ return;
+ }
+ switch(pid = fork()){
+ case -1:
+ Xerror("try again");
+ close(pfd[PRD]);
+ close(pfd[PWR]);
+ return;
+ case 0:
+ close(pfd[PRD]);
+ start(runq->code, runq->pc+1, runq->local);
+ pushredir(ROPEN, pfd[PWR], 1);
+ return;
+ default:
+ close(pfd[PWR]);
+ f = openfd(pfd[PRD]);
+ s = wd;
+ v = 0;
+ while((c = rchr(f))!=EOF){
+ if(strchr(stop, c) || s==ewd){
+ if(s!=wd){
+ *s='\0';
+ v = newword(wd, v);
+ s = wd;
+ }
+ }
+ else *s++=c;
+ }
+ if(s!=wd){
+ *s='\0';
+ v = newword(wd, v);
+ }
+ closeio(f);
+ Waitfor(pid, 0);
+ /* v points to reversed arglist -- reverse it onto argv */
+ while(v){
+ nextv = v->next;
+ v->next = runq->argv->words;
+ runq->argv->words = v;
+ v = nextv;
+ }
+ runq->pc = runq->code[runq->pc].i;
+ return;
+ }
+}
+
+void
+Xpipefd(void)
+{
+ struct thread *p = runq;
+ int pc = p->pc;
+ char name[40];
+ int pfd[2];
+ int sidefd, mainfd;
+ if(pipe(pfd)<0){
+ Xerror("can't get pipe");
+ return;
+ }
+ if(p->code[pc].i==READ){
+ sidefd = pfd[PWR];
+ mainfd = pfd[PRD];
+ }
+ else{
+ sidefd = pfd[PRD];
+ mainfd = pfd[PWR];
+ }
+ switch(fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(p->code, pc+2, runq->local);
+ close(mainfd);
+ pushredir(ROPEN, sidefd, p->code[pc].i==READ?1:0);
+ runq->ret = 0;
+ break;
+ default:
+ close(sidefd);
+ pushredir(ROPEN, mainfd, mainfd); /* isn't this a noop? */
+ strcpy(name, Fdprefix);
+ inttoascii(name+strlen(name), mainfd);
+ pushword(name);
+ p->pc = p->code[pc+1].i;
+ break;
+ }
+}
+
+void
+Xsubshell(void)
+{
+ int pid;
+ switch(pid = fork()){
+ case -1:
+ Xerror("try again");
+ break;
+ case 0:
+ start(runq->code, runq->pc+1, runq->local);
+ runq->ret = 0;
+ break;
+ default:
+ Waitfor(pid, 1);
+ runq->pc = runq->code[runq->pc].i;
+ break;
+ }
+}
+
+int
+execforkexec(void)
+{
+ int pid;
+ int n;
+ char buf[ERRMAX];
+
+ switch(pid = fork()){
+ case -1:
+ return -1;
+ case 0:
+ pushword("exec");
+ execexec();
+ strcpy(buf, "can't exec: ");
+ n = strlen(buf);
+ errstr(buf+n, ERRMAX-n);
+ Exit(buf);
+ }
+ return pid;
+}
DIR diff --git a/src/cmd/rc/haventfork.c b/src/cmd/rc/haventfork.c
t@@ -0,0 +1,211 @@
+#include "rc.h"
+#include "getflags.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+
+int havefork = 0;
+
+static char **
+rcargv(char *s)
+{
+ int argc;
+ char **argv;
+ word *p;
+
+ p = vlook("*")->val;
+ argv = malloc((count(p)+6)*sizeof(char*));
+ argc = 0;
+ argv[argc++] = argv0;
+ if(flag['e'])
+ argv[argc++] = "-Se";
+ else
+ argv[argc++] = "-S";
+ argv[argc++] = "-c";
+ argv[argc++] = s;
+ for(p = vlook("*")->val; p; p = p->next)
+ argv[argc++] = p->word;
+ argv[argc] = 0;
+ return argv;
+}
+
+void
+Xasync(void)
+{
+ uint pid;
+ char buf[20], **argv;
+
+ Updenv();
+
+ argv = rcargv(runq->code[runq->pc].s);
+ pid = ForkExecute(argv0, argv, -1, 1, 2);
+ free(argv);
+
+ if(pid == 0) {
+ Xerror("proc failed");
+ return;
+ }
+
+ runq->pc++;
+ sprint(buf, "%d", pid);
+ setvar("apid", newword(buf, (word *)0));
+}
+
+void
+Xbackq(void)
+{
+ char wd[8193], **argv;
+ int c;
+ char *s, *ewd=&wd[8192], *stop;
+ struct io *f;
+ var *ifs = vlook("ifs");
+ word *v, *nextv;
+ int pfd[2];
+ int pid;
+
+ stop = ifs->val?ifs->val->word:"";
+ if(pipe(pfd)<0){
+ Xerror("can't make pipe");
+ return;
+ }
+
+ Updenv();
+
+ argv = rcargv(runq->code[runq->pc].s);
+ pid = ForkExecute(argv0, argv, -1, pfd[1], 2);
+ free(argv);
+
+ close(pfd[1]);
+
+ if(pid == 0) {
+ Xerror("proc failed");
+ close(pfd[0]);
+ return;
+ }
+
+ f = openfd(pfd[0]);
+ s = wd;
+ v = 0;
+ while((c=rchr(f))!=EOF){
+ if(strchr(stop, c) || s==ewd){
+ if(s!=wd){
+ *s='\0';
+ v=newword(wd, v);
+ s=wd;
+ }
+ }
+ else *s++=c;
+ }
+ if(s!=wd){
+ *s='\0';
+ v=newword(wd, v);
+ }
+ closeio(f);
+ Waitfor(pid, 1);
+ /* v points to reversed arglist -- reverse it onto argv */
+ while(v){
+ nextv=v->next;
+ v->next=runq->argv->words;
+ runq->argv->words=v;
+ v=nextv;
+ }
+ runq->pc++;
+}
+
+void
+Xpipe(void)
+{
+ thread *p=runq;
+ int pc=p->pc, pid;
+ int rfd=p->code[pc+1].i;
+ int pfd[2];
+ char **argv;
+
+ if(pipe(pfd)<0){
+ Xerror1("can't get pipe");
+ return;
+ }
+
+ Updenv();
+
+ argv = rcargv(runq->code[pc+2].s);
+ pid = ForkExecute(argv0, argv, 0, pfd[1], 2);
+ free(argv);
+ close(pfd[1]);
+
+ if(pid == 0) {
+ Xerror("proc failed");
+ close(pfd[0]);
+ return;
+ }
+
+ start(p->code, pc+4, runq->local);
+ pushredir(ROPEN, pfd[0], rfd);
+ p->pc=p->code[pc+3].i;
+ p->pid=pid;
+}
+
+void
+Xpipefd(void)
+{
+ Abort();
+}
+
+void
+Xsubshell(void)
+{
+ char **argv;
+ int pid;
+
+ Updenv();
+
+ argv = rcargv(runq->code[runq->pc].s);
+ pid = ForkExecute(argv0, argv, -1, 1, 2);
+ free(argv);
+
+ if(pid < 0) {
+ Xerror("proc failed");
+ return;
+ }
+
+ Waitfor(pid, 1);
+ runq->pc++;
+}
+
+/*
+ * start a process running the cmd on the stack and return its pid.
+ */
+int
+execforkexec(void)
+{
+ char **argv;
+ char file[1024];
+ int nc;
+ word *path;
+ int pid;
+
+ if(runq->argv->words==0)
+ return -1;
+ argv = mkargv(runq->argv->words);
+
+ for(path = searchpath(runq->argv->words->word);path;path = path->next){
+ nc = strlen(path->word);
+ if(nc<sizeof(file)){
+ strcpy(file, path->word);
+ if(file[0]){
+ strcat(file, "/");
+ nc++;
+ }
+ if(nc+strlen(argv[1])<sizeof(file)){
+ strcat(file, argv[1]);
+ pid = ForkExecute(file, argv+1, mapfd(0), mapfd(1), mapfd(2));
+ if(pid >= 0){
+ free(argv);
+ return pid;
+ }
+ }
+ }
+ }
+ free(argv);
+ return -1;
+}
DIR diff --git a/src/cmd/rc/here.c b/src/cmd/rc/here.c
t@@ -0,0 +1,131 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+struct here *here, **ehere;
+int ser=0;
+char tmp[]="/tmp/here0000.0000";
+char hex[]="0123456789abcdef";
+void psubst(io*, char*);
+void pstrs(io*, word*);
+void hexnum(char *p, int n)
+{
+ *p++=hex[(n>>12)&0xF];
+ *p++=hex[(n>>8)&0xF];
+ *p++=hex[(n>>4)&0xF];
+ *p=hex[n&0xF];
+}
+tree *heredoc(tree *tag)
+{
+ struct here *h=new(struct here);
+ if(tag->type!=WORD) yyerror("Bad here tag");
+ h->next=0;
+ if(here)
+ *ehere=h;
+ else
+ here=h;
+ ehere=&h->next;
+ h->tag=tag;
+ hexnum(&tmp[9], getpid());
+ hexnum(&tmp[14], ser++);
+ h->name=strdup(tmp);
+ return token(tmp, WORD);
+}
+/*
+ * bug: lines longer than NLINE get split -- this can cause spurious
+ * missubstitution, or a misrecognized EOF marker.
+ */
+#define NLINE 4096
+void readhere(void){
+ struct here *h, *nexth;
+ io *f;
+ char *s, *tag;
+ int c, subst;
+ char line[NLINE+1];
+ for(h=here;h;h=nexth){
+ subst=!h->tag->quoted;
+ tag=h->tag->str;
+ c=Creat(h->name);
+ if(c<0) yyerror("can't create here document");
+ f=openfd(c);
+ s=line;
+ pprompt();
+ while((c=rchr(runq->cmdfd))!=EOF){
+ if(c=='\n' || s==&line[NLINE]){
+ *s='\0';
+ if(strcmp(line, tag)==0) break;
+ if(subst) psubst(f, line);
+ else pstr(f, line);
+ s=line;
+ if(c=='\n'){
+ pprompt();
+ pchr(f, c);
+ }
+ else *s++=c;
+ }
+ else *s++=c;
+ }
+ flush(f);
+ closeio(f);
+ cleanhere(h->name);
+ nexth=h->next;
+ efree((char *)h);
+ }
+ here=0;
+ doprompt=1;
+}
+void psubst(io *f, char *s)
+{
+ char *t, *u;
+ int savec, n;
+ word *star;
+ while(*s){
+ if(*s!='$'){
+ if(0xa0<=(*s&0xff) && (*s&0xff)<=0xf5){
+ pchr(f, *s++);
+ if(*s=='\0') break;
+ }
+ else if(0xf6<=(*s&0xff) && (*s&0xff)<=0xf7){
+ pchr(f, *s++);
+ if(*s=='\0') break;
+ pchr(f, *s++);
+ if(*s=='\0') break;
+ }
+ pchr(f, *s++);
+ }
+ else{
+ t=++s;
+ if(*t=='$') pchr(f, *t++);
+ else{
+ while(*t && idchr(*t)) t++;
+ savec=*t;
+ *t='\0';
+ n=0;
+ for(u=s;*u && '0'<=*u && *u<='9';u++) n=n*10+*u-'0';
+ if(n && *u=='\0'){
+ star=vlook("*")->val;
+ if(star && 1<=n && n<=count(star)){
+ while(--n) star=star->next;
+ pstr(f, star->word);
+ }
+ }
+ else
+ pstrs(f, vlook(s)->val);
+ *t=savec;
+ if(savec=='^') t++;
+ }
+ s=t;
+ }
+ }
+}
+void pstrs(io *f, word *a)
+{
+ if(a){
+ while(a->next && a->next->word){
+ pstr(f, a->word);
+ pchr(f, ' ');
+ a=a->next;
+ }
+ pstr(f, a->word);
+ }
+}
DIR diff --git a/src/cmd/rc/io.c b/src/cmd/rc/io.c
t@@ -0,0 +1,179 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+int pfmtnest=0;
+void pfmt(io *f, char *fmt, ...){
+ va_list ap;
+ char err[ERRMAX];
+ va_start(ap, fmt);
+ pfmtnest++;
+ for(;*fmt;fmt++)
+ if(*fmt!='%') pchr(f, *fmt);
+ else switch(*++fmt){
+ case '\0': va_end(ap); return;
+ case 'c': pchr(f, va_arg(ap, int)); break;
+ case 'd': pdec(f, va_arg(ap, int)); break;
+ case 'o': poct(f, va_arg(ap, unsigned)); break;
+ case 'p': phex(f, (long)va_arg(ap, char *)); break; /*unportable*/
+ case 'Q': pquo(f, va_arg(ap, char *)); break;
+ case 'q': pwrd(f, va_arg(ap, char *)); break;
+ case 'r': errstr(err, sizeof err); pstr(f, err); break;
+ case 's': pstr(f, va_arg(ap, char *)); break;
+ case 't': pcmd(f, va_arg(ap, struct tree *)); break;
+ case 'v': pval(f, va_arg(ap, struct word *)); break;
+ default: pchr(f, *fmt); break;
+ }
+ va_end(ap);
+ if(--pfmtnest==0) flush(f);
+}
+void pchr(io *b, int c)
+{
+ if(b->bufp==b->ebuf) fullbuf(b, c);
+ else *b->bufp++=c;
+}
+int rchr(io *b)
+{
+ if(b->bufp==b->ebuf) return emptybuf(b);
+ return *b->bufp++ & 0xFF;
+}
+
+void pquo(io *f, char *s)
+{
+ pchr(f, '\'');
+ for(;*s;s++)
+ if(*s=='\'') pfmt(f, "''");
+ else pchr(f, *s);
+ pchr(f, '\'');
+}
+void pwrd(io *f, char *s)
+{
+ char *t;
+ for(t=s;*t;t++) if(!wordchr(*t)) break;
+ if(t==s || *t) pquo(f, s);
+ else pstr(f, s);
+}
+void phex(io *f, long p)
+{
+ int n;
+ for(n=28;n>=0;n-=4) pchr(f, "0123456789ABCDEF"[(p>>n)&0xF]);
+}
+void pstr(io *f, char *s)
+{
+ if(s==0) s="(null)";
+ while(*s) pchr(f, *s++);
+}
+void pdec(io *f, long n)
+{
+ if(n<0){
+ n=-n;
+ if(n>=0){
+ pchr(f, '-');
+ pdec(f, n);
+ return;
+ }
+ /* n is two's complement minimum integer */
+ n=1-n;
+ pchr(f, '-');
+ pdec(f, n/10);
+ pchr(f, n%10+'1');
+ return;
+ }
+ if(n>9) pdec(f, n/10);
+ pchr(f, n%10+'0');
+}
+void poct(io *f, ulong n)
+{
+ if(n>7) poct(f, n>>3);
+ pchr(f, (n&7)+'0');
+}
+void pval(io *f, word *a)
+{
+ if(a){
+ while(a->next && a->next->word){
+ pwrd(f, a->word);
+ pchr(f, ' ');
+ a=a->next;
+ }
+ pwrd(f, a->word);
+ }
+}
+int fullbuf(io *f, int c)
+{
+ flush(f);
+ return *f->bufp++=c;
+}
+void flush(io *f)
+{
+ int n;
+ char *s;
+ if(f->strp){
+ n=f->ebuf-f->strp;
+ f->strp=realloc(f->strp, n+101);
+ if(f->strp==0) panic("Can't realloc %d bytes in flush!", n+101);
+ f->bufp=f->strp+n;
+ f->ebuf=f->bufp+100;
+ for(s=f->bufp;s<=f->ebuf;s++) *s='\0';
+ }
+ else{
+ n=f->bufp-f->buf;
+ if(n && Write(f->fd, f->buf, n) < 0){
+ Write(3, "Write error\n", 12);
+ if(ntrap) dotrap();
+ }
+ f->bufp=f->buf;
+ f->ebuf=f->buf+NBUF;
+ }
+}
+io *openfd(int fd){
+ io *f=new(struct io);
+ f->fd=fd;
+ f->bufp=f->ebuf=f->buf;
+ f->strp=0;
+ return f;
+}
+io *openstr(void){
+ io *f=new(struct io);
+ char *s;
+ f->fd=-1;
+ f->bufp=f->strp=emalloc(101);
+ f->ebuf=f->bufp+100;
+ for(s=f->bufp;s<=f->ebuf;s++) *s='\0';
+ return f;
+}
+/*
+ * Open a corebuffer to read. EOF occurs after reading len
+ * characters from buf.
+ */
+io *opencore(char *s, int len)
+{
+ io *f=new(struct io);
+ char *buf=emalloc(len);
+ f->fd= -1 /*open("/dev/null", 0)*/;
+ f->bufp=f->strp=buf;
+ f->ebuf=buf+len;
+ Memcpy(buf, s, len);
+ return f;
+}
+void rewind(io *io)
+{
+ if(io->fd==-1) io->bufp=io->strp;
+ else{
+ io->bufp=io->ebuf=io->buf;
+ Seek(io->fd, 0L, 0);
+ }
+}
+void closeio(io *io)
+{
+ if(io->fd>=0) close(io->fd);
+ if(io->strp) efree(io->strp);
+ efree((char *)io);
+}
+int emptybuf(io *f)
+{
+ int n;
+ if(f->fd==-1 || (n=Read(f->fd, f->buf, NBUF))<=0) return EOF;
+ f->bufp=f->buf;
+ f->ebuf=f->buf+n;
+ return *f->bufp++&0xff;
+}
DIR diff --git a/src/cmd/rc/io.h b/src/cmd/rc/io.h
t@@ -0,0 +1,24 @@
+#define EOF (-1)
+#define NBUF 512
+struct io{
+ int fd;
+ char *bufp, *ebuf, *strp, buf[NBUF];
+};
+io *err;
+io *openfd(int), *openstr(void), *opencore(char *, int);
+int emptybuf(io*);
+void pchr(io*, int);
+int rchr(io*);
+void closeio(io*);
+void flush(io*);
+int fullbuf(io*, int);
+void pdec(io*, long);
+void poct(io*, ulong);
+void phex(io*, long);
+void pquo(io*, char*);
+void pwrd(io*, char*);
+void pstr(io*, char*);
+void pcmd(io*, tree*);
+void pval(io*, word*);
+void pfnc(io*, thread*);
+void pfmt(io*, char*, ...);
DIR diff --git a/src/cmd/rc/lex.c b/src/cmd/rc/lex.c
t@@ -0,0 +1,322 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "getflags.h"
+#include "fns.h"
+int getnext(void);
+int wordchr(int c)
+{
+ return !strchr("\n \t#;&|^$=`'{}()<>", c) && c!=EOF;
+}
+int idchr(int c)
+{
+ /*
+ * Formerly:
+ * return 'a'<=c && c<='z' || 'A'<=c && c<='Z' || '0'<=c && c<='9'
+ * || c=='_' || c=='*';
+ */
+ return c>' ' && !strchr("!\"#$%&'()+,-./:;<=>?@[\\]^`{|}~", c);
+}
+int future=EOF;
+int doprompt=1;
+int inquote;
+/*
+ * Look ahead in the input stream
+ */
+int nextc(void){
+ if(future==EOF) future=getnext();
+ return future;
+}
+/*
+ * Consume the lookahead character.
+ */
+int advance(void){
+ int c=nextc();
+ lastc=future;
+ future=EOF;
+ return c;
+}
+/*
+ * read a character from the input stream
+ */
+int getnext(void){
+ register int c;
+ static int peekc=EOF;
+ if(peekc!=EOF){
+ c=peekc;
+ peekc=EOF;
+ return c;
+ }
+ if(runq->eof) return EOF;
+ if(doprompt) pprompt();
+ c=rchr(runq->cmdfd);
+ if(!inquote && c=='\\'){
+ c=rchr(runq->cmdfd);
+ if(c=='\n'){
+ doprompt=1;
+ c=' ';
+ }
+ else{
+ peekc=c;
+ c='\\';
+ }
+ }
+ doprompt=doprompt || c=='\n' || c==EOF;
+ if(c==EOF) runq->eof++;
+ else if(flag['V'] || ndot>=2 && flag['v']) pchr(err, c);
+ return c;
+}
+void pprompt(void){
+ var *prompt;
+ if(runq->iflag){
+ pstr(err, promptstr);
+ flush(err);
+ prompt=vlook("prompt");
+ if(prompt->val && prompt->val->next)
+ promptstr=prompt->val->next->word;
+ else
+ promptstr="\t";
+ }
+ runq->lineno++;
+ doprompt=0;
+}
+void skipwhite(void){
+ int c;
+ for(;;){
+ c=nextc();
+ if(c=='#'){ /* Why did this used to be if(!inquote && c=='#') ?? */
+ for(;;){
+ c=nextc();
+ if(c=='\n' || c==EOF) break;
+ advance();
+ }
+ }
+ if(c==' ' || c=='\t') advance();
+ else return;
+ }
+}
+void skipnl(void){
+ register int c;
+ for(;;){
+ skipwhite();
+ c=nextc();
+ if(c!='\n') return;
+ advance();
+ }
+}
+int nextis(int c){
+ if(nextc()==c){
+ advance();
+ return 1;
+ }
+ return 0;
+}
+char *addtok(char *p, int val){
+ if(p==0) return 0;
+ if(p==&tok[NTOK]){
+ *p=0;
+ yyerror("token buffer too short");
+ return 0;
+ }
+ *p++=val;
+ return p;
+}
+char *addutf(char *p, int c){
+ p=addtok(p, c);
+ if(twobyte(c)) /* 2-byte escape */
+ return addtok(p, advance());
+ if(threebyte(c)){ /* 3-byte escape */
+ p=addtok(p, advance());
+ return addtok(p, advance());
+ }
+ return p;
+}
+int lastdol; /* was the last token read '$' or '$#' or '"'? */
+int lastword; /* was the last token read a word or compound word terminator? */
+int yylex(void){
+ register int c, d=nextc();
+ register char *w=tok;
+ register struct tree *t;
+ yylval.tree=0;
+ /*
+ * Embarassing sneakiness: if the last token read was a quoted or unquoted
+ * WORD then we alter the meaning of what follows. If the next character
+ * is `(', we return SUB (a subscript paren) and consume the `('. Otherwise,
+ * if the next character is the first character of a simple or compound word,
+ * we insert a `^' before it.
+ */
+ if(lastword){
+ lastword=0;
+ if(d=='('){
+ advance();
+ strcpy(tok, "( [SUB]");
+ return SUB;
+ }
+ if(wordchr(d) || d=='\'' || d=='`' || d=='$' || d=='"'){
+ strcpy(tok, "^");
+ return '^';
+ }
+ }
+ inquote=0;
+ skipwhite();
+ switch(c=advance()){
+ case EOF:
+ lastdol=0;
+ strcpy(tok, "EOF");
+ return EOF;
+ case '$':
+ lastdol=1;
+ if(nextis('#')){
+ strcpy(tok, "$#");
+ return COUNT;
+ }
+ if(nextis('"')){
+ strcpy(tok, "$\"");
+ return '"';
+ }
+ strcpy(tok, "$");
+ return '$';
+ case '&':
+ lastdol=0;
+ if(nextis('&')){
+ skipnl();
+ strcpy(tok, "&&");
+ return ANDAND;
+ }
+ strcpy(tok, "&");
+ return '&';
+ case '|':
+ lastdol=0;
+ if(nextis(c)){
+ skipnl();
+ strcpy(tok, "||");
+ return OROR;
+ }
+ case '<':
+ case '>':
+ lastdol=0;
+ /*
+ * funny redirection tokens:
+ * redir: arrow | arrow '[' fd ']'
+ * arrow: '<' | '<<' | '>' | '>>' | '|'
+ * fd: digit | digit '=' | digit '=' digit
+ * digit: '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
+ * some possibilities are nonsensical and get a message.
+ */
+ *w++=c;
+ t=newtree();
+ switch(c){
+ case '|':
+ t->type=PIPE;
+ t->fd0=1;
+ t->fd1=0;
+ break;
+ case '>':
+ t->type=REDIR;
+ if(nextis(c)){
+ t->rtype=APPEND;
+ *w++=c;
+ }
+ else t->rtype=WRITE;
+ t->fd0=1;
+ break;
+ case '<':
+ t->type=REDIR;
+ if(nextis(c)){
+ t->rtype=HERE;
+ *w++=c;
+ }
+ else t->rtype=READ;
+ t->fd0=0;
+ break;
+ }
+ if(nextis('[')){
+ *w++='[';
+ c=advance();
+ *w++=c;
+ if(c<'0' || '9'<c){
+ RedirErr:
+ *w=0;
+ yyerror(t->type==PIPE?"pipe syntax"
+ :"redirection syntax");
+ return EOF;
+ }
+ t->fd0=0;
+ do{
+ t->fd0=t->fd0*10+c-'0';
+ *w++=c;
+ c=advance();
+ }while('0'<=c && c<='9');
+ if(c=='='){
+ *w++='=';
+ if(t->type==REDIR) t->type=DUP;
+ c=advance();
+ if('0'<=c && c<='9'){
+ t->rtype=DUPFD;
+ t->fd1=t->fd0;
+ t->fd0=0;
+ do{
+ t->fd0=t->fd0*10+c-'0';
+ *w++=c;
+ c=advance();
+ }while('0'<=c && c<='9');
+ }
+ else{
+ if(t->type==PIPE) goto RedirErr;
+ t->rtype=CLOSE;
+ }
+ }
+ if(c!=']'
+ || t->type==DUP && (t->rtype==HERE || t->rtype==APPEND))
+ goto RedirErr;
+ *w++=']';
+ }
+ *w='\0';
+ yylval.tree=t;
+ if(t->type==PIPE) skipnl();
+ return t->type;
+ case '\'':
+ lastdol=0;
+ lastword=1;
+ inquote=1;
+ for(;;){
+ c=advance();
+ if(c==EOF) break;
+ if(c=='\''){
+ if(nextc()!='\'')
+ break;
+ advance();
+ }
+ w=addutf(w, c);
+ }
+ if(w!=0) *w='\0';
+ t=token(tok, WORD);
+ t->quoted=1;
+ yylval.tree=t;
+ return t->type;
+ }
+ if(!wordchr(c)){
+ lastdol=0;
+ tok[0]=c;
+ tok[1]='\0';
+ return c;
+ }
+ for(;;){
+ /* next line should have (char)c==GLOB, but ken's compiler is broken */
+ if(c=='*' || c=='[' || c=='?' || c==(unsigned char)GLOB)
+ w=addtok(w, GLOB);
+ w=addutf(w, c);
+ c=nextc();
+ if(lastdol?!idchr(c):!wordchr(c)) break;
+ advance();
+ }
+
+ lastword=1;
+ lastdol=0;
+ if(w!=0) *w='\0';
+ t=klook(tok);
+ if(t->type!=WORD) lastword=0;
+ t->quoted=0;
+ yylval.tree=t;
+ return t->type;
+}
DIR diff --git a/src/cmd/rc/mkfile b/src/cmd/rc/mkfile
t@@ -0,0 +1,39 @@
+PLAN9=../../..
+<$PLAN9/src/mkhdr
+YACC=yacc -d
+
+TARG=rc
+
+OFILES=\
+ code.$O\
+ exec.$O\
+ getflags.$O\
+ glob.$O\
+ here.$O\
+ io.$O\
+ lex.$O\
+ pcmd.$O\
+ pfnc.$O\
+ simple.$O\
+ subr.$O\
+ trap.$O\
+ tree.$O\
+ var.$O\
+ y.tab.$O\
+ plan9ish.$O\
+
+HFILES=\
+ rc.h\
+ x.tab.h\
+ io.h\
+ exec.h\
+ fns.h\
+
+YFILES=syn.y
+
+LDFLAGS=$LDFLAGS -l9 -lfmt -lutf
+
+<$PLAN9/src/mkone
+
+x.tab.h: y.tab.h
+ cmp -s x.tab.h y.tab.h || cp y.tab.h x.tab.h
DIR diff --git a/src/cmd/rc/pcmd.c b/src/cmd/rc/pcmd.c
t@@ -0,0 +1,108 @@
+#include "rc.h"
+#include "io.h"
+#include "fns.h"
+char nl='\n'; /* change to semicolon for bourne-proofing */
+#define c0 t->child[0]
+#define c1 t->child[1]
+#define c2 t->child[2]
+void pdeglob(io *f, char *s)
+{
+ while(*s){
+ if(*s==GLOB) s++;
+ pchr(f, *s++);
+ }
+}
+void pcmd(io *f, tree *t)
+{
+ if(t==0) return;
+ switch(t->type){
+ default: pfmt(f, "bad %d %p %p %p", t->type, c0, c1, c2); break;
+ case '$': pfmt(f, "$%t", c0); break;
+ case '"': pfmt(f, "$\"%t", c0); break;
+ case '&': pfmt(f, "%t&", c0); break;
+ case '^': pfmt(f, "%t^%t", c0, c1); break;
+ case '`': pfmt(f, "`%t", c0); break;
+ case ANDAND: pfmt(f, "%t && %t", c0, c1); break;
+ case BANG: pfmt(f, "! %t", c0); break;
+ case BRACE: pfmt(f, "{%t}", c0); break;
+ case COUNT: pfmt(f, "$#%t", c0); break;
+ case FN: pfmt(f, "fn %t %t", c0, c1); break;
+ case IF: pfmt(f, "if%t%t", c0, c1); break;
+ case NOT: pfmt(f, "if not %t", c0); break;
+ case OROR: pfmt(f, "%t || %t", c0, c1); break;
+ case PCMD:
+ case PAREN: pfmt(f, "(%t)", c0); break;
+ case SUB: pfmt(f, "$%t(%t)", c0, c1); break;
+ case SIMPLE: pfmt(f, "%t", c0); break;
+ case SUBSHELL: pfmt(f, "@ %t", c0); break;
+ case SWITCH: pfmt(f, "switch %t %t", c0, c1); break;
+ case TWIDDLE: pfmt(f, "~ %t %t", c0, c1); break;
+ case WHILE: pfmt(f, "while %t%t", c0, c1); break;
+ case ARGLIST:
+ if(c0==0)
+ pfmt(f, "%t", c1);
+ else if(c1==0)
+ pfmt(f, "%t", c0);
+ else
+ pfmt(f, "%t %t", c0, c1);
+ break;
+ case ';':
+ if(c0){
+ if(c1) pfmt(f, "%t%c%t", c0, nl, c1);
+ else pfmt(f, "%t", c0);
+ }
+ else pfmt(f, "%t", c1);
+ break;
+ case WORDS:
+ if(c0) pfmt(f, "%t ", c0);
+ pfmt(f, "%t", c1);
+ break;
+ case FOR:
+ pfmt(f, "for(%t", c0);
+ if(c1) pfmt(f, " in %t", c1);
+ pfmt(f, ")%t", c2);
+ break;
+ case WORD:
+ if(t->quoted) pfmt(f, "%Q", t->str);
+ else pdeglob(f, t->str);
+ break;
+ case DUP:
+ if(t->rtype==DUPFD)
+ pfmt(f, ">[%d=%d]", t->fd1, t->fd0); /* yes, fd1, then fd0; read lex.c */
+ else
+ pfmt(f, ">[%d=]", t->fd0);
+ pfmt(f, "%t", c1);
+ break;
+ case PIPEFD:
+ case REDIR:
+ switch(t->rtype){
+ case HERE:
+ pchr(f, '<');
+ case READ:
+ pchr(f, '<');
+ if(t->fd0!=0) pfmt(f, "[%d]", t->fd0);
+ break;
+ case APPEND:
+ pchr(f, '>');
+ case WRITE:
+ pchr(f, '>');
+ if(t->fd0!=1) pfmt(f, "[%d]", t->fd0);
+ break;
+ }
+ pfmt(f, "%t", c0);
+ if(c1) pfmt(f, " %t", c1);
+ break;
+ case '=':
+ pfmt(f, "%t=%t", c0, c1);
+ if(c2) pfmt(f, " %t", c2);
+ break;
+ case PIPE:
+ pfmt(f, "%t|", c0);
+ if(t->fd1==0){
+ if(t->fd0!=1) pfmt(f, "[%d]", t->fd0);
+ }
+ else pfmt(f, "[%d=%d]", t->fd0, t->fd1);
+ pfmt(f, "%t", c1);
+ break;
+ }
+}
DIR diff --git a/src/cmd/rc/pfnc.c b/src/cmd/rc/pfnc.c
t@@ -0,0 +1,67 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+struct{
+ void (*f)(void);
+ char *name;
+}fname[]={
+ Xappend, "Xappend",
+ Xasync, "Xasync",
+ Xbang, "Xbang",
+ Xclose, "Xclose",
+ Xdup, "Xdup",
+ Xeflag, "Xeflag",
+ Xexit, "Xexit",
+ Xfalse, "Xfalse",
+ Xifnot, "Xifnot",
+ Xjump, "Xjump",
+ Xmark, "Xmark",
+ Xpopm, "Xpopm",
+ Xread, "Xread",
+ Xreturn, "Xreturn",
+ Xtrue, "Xtrue",
+ Xif, "Xif",
+ Xwastrue, "Xwastrue",
+ Xword, "Xword",
+ Xwrite, "Xwrite",
+ Xmatch, "Xmatch",
+ Xcase, "Xcase",
+ Xconc, "Xconc",
+ Xassign, "Xassign",
+ Xdol, "Xdol",
+ Xcount, "Xcount",
+ Xlocal, "Xlocal",
+ Xunlocal, "Xunlocal",
+ Xfn, "Xfn",
+ Xdelfn, "Xdelfn",
+ Xpipe, "Xpipe",
+ Xpipewait, "Xpipewait",
+ Xrdcmds, "Xrdcmds",
+ (void (*)(void))Xerror, "Xerror",
+ Xbackq, "Xbackq",
+ Xpipefd, "Xpipefd",
+ Xsubshell, "Xsubshell",
+ Xdelhere, "Xdelhere",
+ Xfor, "Xfor",
+ Xglob, "Xglob",
+ Xrdfn, "Xrdfn",
+ Xsimple, "Xsimple",
+ Xrdfn, "Xrdfn",
+ Xqdol, "Xqdol",
+0};
+void pfnc(io *fd, thread *t)
+{
+ int i;
+ void (*fn)(void)=t->code[t->pc].f;
+ list *a;
+ pfmt(fd, "pid %d cycle %p %d ", getpid(), t->code, t->pc);
+ for(i=0;fname[i].f;i++) if(fname[i].f==fn){
+ pstr(fd, fname[i].name);
+ break;
+ }
+ if(!fname[i].f) pfmt(fd, "%p", fn);
+ for(a=t->argv;a;a=a->next) pfmt(fd, " (%v)", a->words);
+ pchr(fd, '\n');
+ flush(fd);
+}
DIR diff --git a/src/cmd/rc/plan9ish.c b/src/cmd/rc/plan9ish.c
t@@ -0,0 +1,480 @@
+/*
+ * Plan 9 versions of system-specific functions
+ * By convention, exported routines herein have names beginning with an
+ * upper case letter.
+ */
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+#include "getflags.h"
+char *Signame[]={
+ "sigexit", "sighup", "sigint", "sigquit",
+ "sigalrm", "sigkill", "sigfpe", "sigterm",
+ 0
+};
+char *syssigname[]={
+ "exit", /* can't happen */
+ "hangup",
+ "interrupt",
+ "quit", /* can't happen */
+ "alarm",
+ "kill",
+ "sys: fp: ",
+ "term",
+ 0
+};
+char*
+Rcmain(void)
+{
+ static char buf[256];
+ char *root;
+
+ root = getenv("PLAN9");
+ if(root == nil)
+ root = "/usr/local/plan9";
+ snprint(buf, sizeof buf, "%s/rcmain", root);
+ return buf;
+}
+
+char Fdprefix[]="/dev/fd/";
+void execfinit(void);
+void execbind(void);
+void execmount(void);
+void execnewpgrp(void);
+builtin Builtin[]={
+ "cd", execcd,
+ "whatis", execwhatis,
+ "eval", execeval,
+ "exec", execexec, /* but with popword first */
+ "exit", execexit,
+ "shift", execshift,
+ "wait", execwait,
+ ".", execdot,
+ "finit", execfinit,
+ "flag", execflag,
+ 0
+};
+#define SEP '\1'
+char **environp;
+struct word *enval(s)
+register char *s;
+{
+ register char *t, c;
+ register struct word *v;
+ for(t=s;*t && *t!=SEP;t++);
+ c=*t;
+ *t='\0';
+ v=newword(s, c=='\0'?(struct word *)0:enval(t+1));
+ *t=c;
+ return v;
+}
+void Vinit(void){
+ extern char **environ;
+ register char *s;
+ register char **env=environ;
+ environp=env;
+ for(;*env;env++){
+ for(s=*env;*s && *s!='(' && *s!='=';s++);
+ switch(*s){
+ case '\0':
+ pfmt(err, "environment %q?\n", *env);
+ break;
+ case '=':
+ *s='\0';
+ setvar(*env, enval(s+1));
+ *s='=';
+ break;
+ case '(': /* ignore functions for now */
+ break;
+ }
+ }
+}
+char **envp;
+void Xrdfn(void){
+ char *p;
+ register char *s;
+ register int len;
+ for(;*envp;envp++){
+ s = *envp;
+ if(strncmp(s, "fn#", 3) == 0){
+ p = strchr(s, '=');
+ if(p == nil)
+ continue;
+ *p = ' ';
+ s[2] = ' ';
+ len = strlen(s);
+ execcmds(opencore(s, len));
+ s[len] = '\0';
+ return;
+ }
+#if 0
+ for(s=*envp;*s && *s!='(' && *s!='=';s++);
+ switch(*s){
+ case '\0':
+ pfmt(err, "environment %q?\n", *envp);
+ break;
+ case '=': /* ignore variables */
+ break;
+ case '(': /* Bourne again */
+ s=*envp+3;
+ envp++;
+ len=strlen(s);
+ s[len]='\n';
+ execcmds(opencore(s, len+1));
+ s[len]='\0';
+ return;
+ }
+#endif
+ }
+ Xreturn();
+}
+union code rdfns[4];
+void execfinit(void){
+ static int first=1;
+ if(first){
+ rdfns[0].i=1;
+ rdfns[1].f=Xrdfn;
+ rdfns[2].f=Xjump;
+ rdfns[3].i=1;
+ first=0;
+ }
+ Xpopm();
+ envp=environp;
+ start(rdfns, 1, runq->local);
+}
+int Waitfor(int pid, int unused0){
+ thread *p;
+ Waitmsg *w;
+ char errbuf[ERRMAX];
+
+ while((w = wait()) != nil){
+ if(w->pid==pid){
+ setstatus(w->msg);
+ free(w);
+ return 0;
+ }
+ for(p=runq->ret;p;p=p->ret)
+ if(p->pid==w->pid){
+ p->pid=-1;
+ strcpy(p->status, w->msg);
+ }
+ free(w);
+ }
+
+ errstr(errbuf, sizeof errbuf);
+ if(strcmp(errbuf, "interrupted")==0) return -1;
+ return 0;
+}
+char **mkargv(word *a)
+{
+ char **argv=(char **)emalloc((count(a)+2)*sizeof(char *));
+ char **argp=argv+1; /* leave one at front for runcoms */
+ for(;a;a=a->next) *argp++=a->word;
+ *argp=0;
+ return argv;
+}
+/*
+void addenv(var *v)
+{
+ char envname[256];
+ word *w;
+ int f;
+ io *fd;
+ if(v->changed){
+ v->changed=0;
+ snprint(envname, sizeof envname, "/env/%s", v->name);
+ if((f=Creat(envname))<0)
+ pfmt(err, "rc: can't open %s: %r\n", envname);
+ else{
+ for(w=v->val;w;w=w->next)
+ write(f, w->word, strlen(w->word)+1L);
+ close(f);
+ }
+ }
+ if(v->fnchanged){
+ v->fnchanged=0;
+ snprint(envname, sizeof envname, "/env/fn#%s", v->name);
+ if((f=Creat(envname))<0)
+ pfmt(err, "rc: can't open %s: %r\n", envname);
+ else{
+ if(v->fn){
+ fd=openfd(f);
+ pfmt(fd, "fn %s %s\n", v->name, v->fn[v->pc-1].s);
+ closeio(fd);
+ }
+ close(f);
+ }
+ }
+}
+void updenvlocal(var *v)
+{
+ if(v){
+ updenvlocal(v->next);
+ addenv(v);
+ }
+}
+void Updenv(void){
+ var *v, **h;
+ for(h=gvar;h!=&gvar[NVAR];h++)
+ for(v=*h;v;v=v->next)
+ addenv(v);
+ if(runq) updenvlocal(runq->local);
+}
+*/
+int
+cmpenv(a, b)
+char **a, **b;
+{
+ return strcmp(*a, *b);
+}
+char **mkenv(){
+ register char **env, **ep, *p, *q;
+ register struct var **h, *v;
+ register struct word *a;
+ register int nvar=0, nchr=0, sep;
+ /*
+ * Slightly kludgy loops look at locals then globals
+ */
+ for(h=gvar-1;h!=&gvar[NVAR];h++) for(v=h>=gvar?*h:runq->local;v;v=v->next){
+ if((v==vlook(v->name)) && v->val){
+ nvar++;
+ nchr+=strlen(v->name)+1;
+ for(a=v->val;a;a=a->next)
+ nchr+=strlen(a->word)+1;
+ }
+ if(v->fn){
+ nvar++;
+ nchr+=strlen(v->name)+strlen(v->fn[v->pc-1].s)+8;
+ }
+ }
+ env=(char **)emalloc((nvar+1)*sizeof(char *)+nchr);
+ ep=env;
+ p=(char *)&env[nvar+1];
+ for(h=gvar-1;h!=&gvar[NVAR];h++) for(v=h>=gvar?*h:runq->local;v;v=v->next){
+ if((v==vlook(v->name)) && v->val){
+ *ep++=p;
+ q=v->name;
+ while(*q) *p++=*q++;
+ sep='=';
+ for(a=v->val;a;a=a->next){
+ *p++=sep;
+ sep=SEP;
+ q=a->word;
+ while(*q) *p++=*q++;
+ }
+ *p++='\0';
+ }
+ if(v->fn){
+ *ep++=p;
+#if 0
+ *p++='#'; *p++='('; *p++=')'; /* to fool Bourne */
+ *p++='f'; *p++='n'; *p++=' ';
+ q=v->name;
+ while(*q) *p++=*q++;
+ *p++=' ';
+#endif
+ *p++='f'; *p++='n'; *p++='#';
+ q=v->name;
+ while(*q) *p++=*q++;
+ *p++='=';
+ q=v->fn[v->pc-1].s;
+ while(*q) *p++=*q++;
+ *p++='\n';
+ *p++='\0';
+ }
+ }
+ *ep=0;
+ qsort((char *)env, nvar, sizeof ep[0], cmpenv);
+ return env;
+}
+void Updenv(void){}
+void Execute(word *args, word *path)
+{
+ char **argv=mkargv(args);
+ char **env=mkenv();
+ char file[1024];
+ int nc;
+ Updenv();
+ for(;path;path=path->next){
+ nc=strlen(path->word);
+ if(nc<1024){
+ strcpy(file, path->word);
+ if(file[0]){
+ strcat(file, "/");
+ nc++;
+ }
+ if(nc+strlen(argv[1])<1024){
+ strcat(file, argv[1]);
+ execve(file, argv+1, env);
+ }
+ else werrstr("command name too long");
+ }
+ }
+ rerrstr(file, sizeof file);
+ pfmt(err, "%s: %s\n", argv[1], file);
+ efree((char *)argv);
+}
+#define NDIR 256 /* shoud be a better way */
+int Globsize(char *p)
+{
+ ulong isglob=0, globlen=NDIR+1;
+ for(;*p;p++){
+ if(*p==GLOB){
+ p++;
+ if(*p!=GLOB) isglob++;
+ globlen+=*p=='*'?NDIR:1;
+ }
+ else
+ globlen++;
+ }
+ return isglob?globlen:0;
+}
+#define NFD 50
+#define NDBUF 32
+struct{
+ Dir *dbuf;
+ int i;
+ int n;
+}dir[NFD];
+int Opendir(char *name)
+{
+ Dir *db;
+ int f;
+ f=open(name, 0);
+ if(f==-1)
+ return f;
+ db = dirfstat(f);
+ if(db!=nil && (db->mode&DMDIR)){
+ if(f<NFD){
+ dir[f].i=0;
+ dir[f].n=0;
+ }
+ free(db);
+ return f;
+ }
+ free(db);
+ close(f);
+ return -1;
+}
+int Readdir(int f, char *p)
+{
+ int n;
+ if(f<0 || f>=NFD)
+ return 0;
+ if(dir[f].i==dir[f].n){ /* read */
+ free(dir[f].dbuf);
+ dir[f].dbuf=0;
+ n=dirread(f, &dir[f].dbuf);
+ if(n>=0)
+ dir[f].n=n;
+ else
+ dir[f].n=0;
+ dir[f].i=0;
+ }
+ if(dir[f].i==dir[f].n)
+ return 0;
+ strcpy(p, dir[f].dbuf[dir[f].i].name);
+ dir[f].i++;
+ return 1;
+}
+void Closedir(int f){
+ if(f>=0 && f<NFD){
+ free(dir[f].dbuf);
+ dir[f].i=0;
+ dir[f].n=0;
+ dir[f].dbuf=0;
+ }
+ close(f);
+}
+int interrupted = 0;
+void
+notifyf(void *unused0, char *s)
+{
+ int i;
+ for(i=0;syssigname[i];i++) if(strncmp(s, syssigname[i], strlen(syssigname[i]))==0){
+ if(strncmp(s, "sys: ", 5)!=0) interrupted=1;
+ goto Out;
+ }
+ pfmt(err, "rc: note: %s\n", s);
+ noted(NDFLT);
+ return;
+Out:
+ if(strcmp(s, "interrupt")!=0 || trap[i]==0){
+ trap[i]++;
+ ntrap++;
+ }
+ if(ntrap>=32){ /* rc is probably in a trap loop */
+ pfmt(err, "rc: Too many traps (trap %s), aborting\n", s);
+ abort();
+ }
+ noted(NCONT);
+}
+void Trapinit(void){
+ notify(notifyf);
+}
+void Unlink(char *name)
+{
+ remove(name);
+}
+long Write(int fd, char *buf, long cnt)
+{
+ return write(fd, buf, (long)cnt);
+}
+long Read(int fd, char *buf, long cnt)
+{
+ return read(fd, buf, cnt);
+}
+long Seek(int fd, long cnt, long whence)
+{
+ return seek(fd, cnt, whence);
+}
+int Executable(char *file)
+{
+ Dir *statbuf;
+ int ret;
+
+ statbuf = dirstat(file);
+ if(statbuf == nil) return 0;
+ ret = ((statbuf->mode&0111)!=0 && (statbuf->mode&DMDIR)==0);
+ free(statbuf);
+ return ret;
+}
+int Creat(char *file)
+{
+ return create(file, 1, 0666L);
+}
+int Dup(int a, int b){
+ return dup(a, b);
+}
+int Dup1(int unused0){
+ return -1;
+}
+void Exit(char *stat)
+{
+ Updenv();
+ setstatus(stat);
+ exits(truestatus()?"":getstatus());
+}
+int Eintr(void){
+ return interrupted;
+}
+void Noerror(void){
+ interrupted=0;
+}
+int
+Isatty(fd){
+ return isatty(fd);
+}
+void Abort(void){
+ pfmt(err, "aborting\n");
+ flush(err);
+ Exit("aborting");
+}
+void Memcpy(char *a, char *b, long n)
+{
+ memmove(a, b, (long)n);
+}
+void *Malloc(ulong n){
+ return malloc(n);
+}
DIR diff --git a/src/cmd/rc/rc.h b/src/cmd/rc/rc.h
t@@ -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;
DIR diff --git a/src/cmd/rc/simple.c b/src/cmd/rc/simple.c
t@@ -0,0 +1,443 @@
+/*
+ * Maybe `simple' is a misnomer.
+ */
+#include "rc.h"
+#include "getflags.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+/*
+ * Search through the following code to see if we're just going to exit.
+ */
+int
+exitnext(void){
+ union code *c=&runq->code[runq->pc];
+ while(c->f==Xpopredir) c++;
+ return c->f==Xexit;
+}
+void Xsimple(void){
+ word *a;
+ thread *p=runq;
+ var *v;
+ struct builtin *bp;
+ int pid, n;
+ char buf[ERRMAX];
+ globlist();
+ a=runq->argv->words;
+ if(a==0){
+ Xerror1("empty argument list");
+ return;
+ }
+ if(flag['x'])
+ pfmt(err, "%v\n", p->argv->words); /* wrong, should do redirs */
+ v=gvlook(a->word);
+ if(v->fn)
+ execfunc(v);
+ else{
+ if(strcmp(a->word, "builtin")==0){
+ if(count(a)==1){
+ pfmt(err, "builtin: empty argument list\n");
+ setstatus("empty arg list");
+ poplist();
+ return;
+ }
+ a=a->next;
+ popword();
+ }
+ for(bp=Builtin;bp->name;bp++)
+ if(strcmp(a->word, bp->name)==0){
+ (*bp->fnc)();
+ return;
+ }
+ if(exitnext()){
+ /* fork and wait is redundant */
+ pushword("exec");
+ execexec();
+ Xexit();
+ }
+ else{
+ flush(err);
+ Updenv(); /* necessary so changes don't go out again */
+ switch(pid=fork()){
+ case -1:
+ Xerror("try again");
+ return;
+ case 0:
+ pushword("exec");
+ execexec();
+ strcpy(buf, "can't exec: ");
+ n = strlen(buf);
+ errstr(buf+n, ERRMAX-n);
+ Exit(buf);
+ default:
+ poplist();
+ /* interrupts don't get us out */
+ while(Waitfor(pid, 1) < 0)
+ ;
+ }
+ }
+ }
+}
+struct word nullpath={ "", 0};
+void doredir(redir *rp)
+{
+ if(rp){
+ doredir(rp->next);
+ switch(rp->type){
+ case ROPEN:
+ if(rp->from!=rp->to){
+ Dup(rp->from, rp->to);
+ close(rp->from);
+ }
+ break;
+ case RDUP: Dup(rp->from, rp->to); break;
+ case RCLOSE: close(rp->from); break;
+ }
+ }
+}
+word *searchpath(char *w){
+ word *path;
+ if(strncmp(w, "/", 1)==0
+ || strncmp(w, "#", 1)==0
+ || strncmp(w, "./", 2)==0
+ || strncmp(w, "../", 3)==0
+ || (path=vlook("path")->val)==0)
+ path=&nullpath;
+ return path;
+}
+void execexec(void){
+ popword(); /* "exec" */
+ if(runq->argv->words==0){
+ Xerror1("empty argument list");
+ return;
+ }
+ doredir(runq->redir);
+ Execute(runq->argv->words, searchpath(runq->argv->words->word));
+ poplist();
+}
+void execfunc(var *func)
+{
+ word *starval;
+ popword();
+ starval=runq->argv->words;
+ runq->argv->words=0;
+ poplist();
+ start(func->fn, func->pc, (struct var *)0);
+ runq->local=newvar(strdup("*"), runq->local);
+ runq->local->val=starval;
+ runq->local->changed=1;
+}
+int dochdir(char *word){
+ /* report to /dev/wdir if it exists and we're interactive */
+ static int wdirfd = -2;
+ if(chdir(word)<0) return -1;
+ if(flag['i']!=0){
+ if(wdirfd==-2) /* try only once */
+ wdirfd = open("/dev/wdir", OWRITE|OCEXEC);
+ if(wdirfd>=0)
+ write(wdirfd, word, strlen(word));
+ }
+ return 1;
+}
+void execcd(void){
+ word *a=runq->argv->words;
+ word *cdpath;
+ char dir[512];
+ setstatus("can't cd");
+ cdpath=vlook("cdpath")->val;
+ switch(count(a)){
+ default:
+ pfmt(err, "Usage: cd [directory]\n");
+ break;
+ case 2:
+ if(a->next->word[0]=='/' || cdpath==0) cdpath=&nullpath;
+ for(;cdpath;cdpath=cdpath->next){
+ strcpy(dir, cdpath->word);
+ if(dir[0]) strcat(dir, "/");
+ strcat(dir, a->next->word);
+ if(dochdir(dir)>=0){
+ if(strlen(cdpath->word)
+ && strcmp(cdpath->word, ".")!=0)
+ pfmt(err, "%s\n", dir);
+ setstatus("");
+ break;
+ }
+ }
+ if(cdpath==0) pfmt(err, "Can't cd %s: %r\n", a->next->word);
+ break;
+ case 1:
+ a=vlook("home")->val;
+ if(count(a)>=1){
+ if(dochdir(a->word)>=0)
+ setstatus("");
+ else
+ pfmt(err, "Can't cd %s: %r\n", a->word);
+ }
+ else
+ pfmt(err, "Can't cd -- $home empty\n");
+ break;
+ }
+ poplist();
+}
+void execexit(void){
+ switch(count(runq->argv->words)){
+ default: pfmt(err, "Usage: exit [status]\nExiting anyway\n");
+ case 2: setstatus(runq->argv->words->next->word);
+ case 1: Xexit();
+ }
+}
+void execshift(void){
+ int n;
+ word *a;
+ var *star;
+ switch(count(runq->argv->words)){
+ default:
+ pfmt(err, "Usage: shift [n]\n");
+ setstatus("shift usage");
+ poplist();
+ return;
+ case 2: n=atoi(runq->argv->words->next->word); break;
+ case 1: n=1; break;
+ }
+ star=vlook("*");
+ for(;n && star->val;--n){
+ a=star->val->next;
+ efree(star->val->word);
+ efree((char *)star->val);
+ star->val=a;
+ star->changed=1;
+ }
+ setstatus("");
+ poplist();
+}
+int octal(char *s)
+{
+ int n=0;
+ while(*s==' ' || *s=='\t' || *s=='\n') s++;
+ while('0'<=*s && *s<='7') n=n*8+*s++-'0';
+ return n;
+}
+int mapfd(int fd)
+{
+ redir *rp;
+ for(rp=runq->redir;rp;rp=rp->next){
+ switch(rp->type){
+ case RCLOSE:
+ if(rp->from==fd) fd=-1;
+ break;
+ case RDUP:
+ case ROPEN:
+ if(rp->to==fd) fd=rp->from;
+ break;
+ }
+ }
+ return fd;
+}
+union code rdcmds[4];
+void execcmds(io *f)
+{
+ static int first=1;
+ if(first){
+ rdcmds[0].i=1;
+ rdcmds[1].f=Xrdcmds;
+ rdcmds[2].f=Xreturn;
+ first=0;
+ }
+ start(rdcmds, 1, runq->local);
+ runq->cmdfd=f;
+ runq->iflast=0;
+}
+void execeval(void){
+ char *cmdline, *s, *t;
+ int len=0;
+ word *ap;
+ if(count(runq->argv->words)<=1){
+ Xerror1("Usage: eval cmd ...");
+ return;
+ }
+ eflagok=1;
+ for(ap=runq->argv->words->next;ap;ap=ap->next)
+ len+=1+strlen(ap->word);
+ cmdline=emalloc(len);
+ s=cmdline;
+ for(ap=runq->argv->words->next;ap;ap=ap->next){
+ for(t=ap->word;*t;) *s++=*t++;
+ *s++=' ';
+ }
+ s[-1]='\n';
+ poplist();
+ execcmds(opencore(cmdline, len));
+ efree(cmdline);
+}
+union code dotcmds[14];
+void execdot(void){
+ int iflag=0;
+ int fd;
+ list *av;
+ thread *p=runq;
+ char *zero;
+ static int first=1;
+ char file[512];
+ word *path;
+ if(first){
+ dotcmds[0].i=1;
+ dotcmds[1].f=Xmark;
+ dotcmds[2].f=Xword;
+ dotcmds[3].s="0";
+ dotcmds[4].f=Xlocal;
+ dotcmds[5].f=Xmark;
+ dotcmds[6].f=Xword;
+ dotcmds[7].s="*";
+ dotcmds[8].f=Xlocal;
+ dotcmds[9].f=Xrdcmds;
+ dotcmds[10].f=Xunlocal;
+ dotcmds[11].f=Xunlocal;
+ dotcmds[12].f=Xreturn;
+ first=0;
+ }
+ else
+ eflagok=1;
+ popword();
+ if(p->argv->words && strcmp(p->argv->words->word, "-i")==0){
+ iflag=1;
+ popword();
+ }
+ /* get input file */
+ if(p->argv->words==0){
+ Xerror1("Usage: . [-i] file [arg ...]");
+ return;
+ }
+ zero=strdup(p->argv->words->word);
+ popword();
+ fd=-1;
+ for(path=searchpath(zero);path;path=path->next){
+ strcpy(file, path->word);
+ if(file[0]) strcat(file, "/");
+ strcat(file, zero);
+ if((fd=open(file, 0))>=0) break;
+ if(strcmp(file, "/dev/stdin")==0){ /* for sun & ucb */
+ fd=Dup1(0);
+ if(fd>=0) break;
+ }
+ }
+ if(fd<0){
+ pfmt(err, "%s: ", zero);
+ setstatus("can't open");
+ Xerror(".: can't open");
+ return;
+ }
+ /* set up for a new command loop */
+ start(dotcmds, 1, (struct var *)0);
+ pushredir(RCLOSE, fd, 0);
+ runq->cmdfile=zero;
+ runq->cmdfd=openfd(fd);
+ runq->iflag=iflag;
+ runq->iflast=0;
+ /* push $* value */
+ pushlist();
+ runq->argv->words=p->argv->words;
+ /* free caller's copy of $* */
+ av=p->argv;
+ p->argv=av->next;
+ efree((char *)av);
+ /* push $0 value */
+ pushlist();
+ pushword(zero);
+ ndot++;
+}
+void execflag(void){
+ char *letter, *val;
+ switch(count(runq->argv->words)){
+ case 2:
+ setstatus(flag[(uchar)runq->argv->words->next->word[0]]?"":"flag not set");
+ break;
+ case 3:
+ letter=runq->argv->words->next->word;
+ val=runq->argv->words->next->next->word;
+ if(strlen(letter)==1){
+ if(strcmp(val, "+")==0){
+ flag[(uchar)letter[0]]=flagset;
+ break;
+ }
+ if(strcmp(val, "-")==0){
+ flag[(uchar)letter[0]]=0;
+ break;
+ }
+ }
+ default:
+ Xerror1("Usage: flag [letter] [+-]");
+ return;
+ }
+ poplist();
+}
+void execwhatis(void){ /* mildly wrong -- should fork before writing */
+ word *a, *b, *path;
+ var *v;
+ struct builtin *bp;
+ char file[512];
+ struct io out[1];
+ int found, sep;
+ a=runq->argv->words->next;
+ if(a==0){
+ Xerror1("Usage: whatis name ...");
+ return;
+ }
+ setstatus("");
+ out->fd=mapfd(1);
+ out->bufp=out->buf;
+ out->ebuf=&out->buf[NBUF];
+ out->strp=0;
+ for(;a;a=a->next){
+ v=vlook(a->word);
+ if(v->val){
+ pfmt(out, "%s=", a->word);
+ if(v->val->next==0)
+ pfmt(out, "%q\n", v->val->word);
+ else{
+ sep='(';
+ for(b=v->val;b && b->word;b=b->next){
+ pfmt(out, "%c%q", sep, b->word);
+ sep=' ';
+ }
+ pfmt(out, ")\n");
+ }
+ found=1;
+ }
+ else
+ found=0;
+ v=gvlook(a->word);
+ if(v->fn) pfmt(out, "fn %s %s\n", v->name, v->fn[v->pc-1].s);
+ else{
+ for(bp=Builtin;bp->name;bp++)
+ if(strcmp(a->word, bp->name)==0){
+ pfmt(out, "builtin %s\n", a->word);
+ break;
+ }
+ if(!bp->name){
+ for(path=searchpath(a->word);path;path=path->next){
+ strcpy(file, path->word);
+ if(file[0]) strcat(file, "/");
+ strcat(file, a->word);
+ if(Executable(file)){
+ pfmt(out, "%s\n", file);
+ break;
+ }
+ }
+ if(!path && !found){
+ pfmt(err, "%s: not found\n", a->word);
+ setstatus("not found");
+ }
+ }
+ }
+ }
+ poplist();
+ flush(err);
+}
+void execwait(void){
+ switch(count(runq->argv->words)){
+ default: Xerror1("Usage: wait [pid]"); return;
+ case 2: Waitfor(atoi(runq->argv->words->next->word), 0); break;
+ case 1: Waitfor(-1, 0); break;
+ }
+ poplist();
+}
DIR diff --git a/src/cmd/rc/subr.c b/src/cmd/rc/subr.c
t@@ -0,0 +1,59 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+char *emalloc(long n){
+ char *p=(char *)Malloc(n);
+ if(p==0) panic("Can't malloc %d bytes", n);
+/* if(err){ pfmt(err, "malloc %d->%p\n", n, p); flush(err); } *//**/
+ return p;
+}
+void efree(char *p)
+{
+/* pfmt(err, "free %p\n", p); flush(err); *//**/
+ if(p) free(p);
+ else pfmt(err, "free 0\n");
+}
+extern int lastword, lastdol;
+void yyerror(char *m)
+{
+ pfmt(err, "rc: ");
+ if(runq->cmdfile && !runq->iflag)
+ pfmt(err, "%s:%d: ", runq->cmdfile, runq->lineno);
+ else if(runq->cmdfile)
+ pfmt(err, "%s: ", runq->cmdfile);
+ else if(!runq->iflag)
+ pfmt(err, "line %d: ", runq->lineno);
+ if(tok[0] && tok[0]!='\n') pfmt(err, "token %q: ", tok);
+ pfmt(err, "%s\n", m);
+ flush(err);
+ lastword=0;
+ lastdol=0;
+ while(lastc!='\n' && lastc!=EOF) advance();
+ nerror++;
+ setvar("status", newword(m, (word *)0));
+}
+char *bp;
+void iacvt(int n){
+ if(n<0){
+ *bp++='-';
+ n=-n; /* doesn't work for n==-inf */
+ }
+ if(n/10)
+ iacvt(n/10);
+ *bp++=n%10+'0';
+}
+void itoa(char *s, long n)
+{
+ bp=s;
+ iacvt(n);
+ *bp='\0';
+}
+void panic(char *s, int n)
+{
+ pfmt(err, "rc: ");
+ pfmt(err, s, n);
+ pchr(err, '\n');
+ flush(err);
+ Abort();
+}
DIR diff --git a/src/cmd/rc/trap.c b/src/cmd/rc/trap.c
t@@ -0,0 +1,34 @@
+#include "rc.h"
+#include "exec.h"
+#include "fns.h"
+#include "io.h"
+extern char *Signame[];
+void dotrap(void){
+ register int i;
+ register struct var *trapreq;
+ register struct word *starval;
+ starval=vlook("*")->val;
+ while(ntrap) for(i=0;i!=NSIG;i++) while(trap[i]){
+ --trap[i];
+ --ntrap;
+ if(getpid()!=mypid) Exit(getstatus());
+ trapreq=vlook(Signame[i]);
+ if(trapreq->fn){
+ start(trapreq->fn, trapreq->pc, (struct var *)0);
+ runq->local=newvar(strdup("*"), runq->local);
+ runq->local->val=copywords(starval, (struct word *)0);
+ runq->local->changed=1;
+ runq->redir=runq->startredir=0;
+ }
+ else if(i==SIGINT || i==SIGQUIT){
+ /*
+ * run the stack down until we uncover the
+ * command reading loop. Xreturn will exit
+ * if there is none (i.e. if this is not
+ * an interactive rc.)
+ */
+ while(!runq->iflag) Xreturn();
+ }
+ else Exit(getstatus());
+ }
+}
DIR diff --git a/src/cmd/rc/tree.c b/src/cmd/rc/tree.c
t@@ -0,0 +1,114 @@
+#include "rc.h"
+#include "exec.h"
+#include "io.h"
+#include "fns.h"
+tree *treenodes;
+/*
+ * create and clear a new tree node, and add it
+ * to the node list.
+ */
+tree *newtree(void){
+ tree *t=new(tree);
+ t->iskw=0;
+ t->str=0;
+ t->child[0]=t->child[1]=t->child[2]=0;
+ t->next=treenodes;
+ treenodes=t;
+ return t;
+}
+void freenodes(void){
+ tree *t, *u;
+ for(t=treenodes;t;t=u){
+ u=t->next;
+ if(t->str) efree(t->str);
+ efree((char *)t);
+ }
+ treenodes=0;
+}
+tree *tree1(int type, tree *c0)
+{
+ return tree3(type, c0, (tree *)0, (tree *)0);
+}
+tree *tree2(int type, tree *c0, tree *c1)
+{
+ return tree3(type, c0, c1, (tree *)0);
+}
+tree *tree3(int type, tree *c0, tree *c1, tree *c2)
+{
+ tree *t;
+ if(type==';'){
+ if(c0==0) return c1;
+ if(c1==0) return c0;
+ }
+ t=newtree();
+ t->type=type;
+ t->child[0]=c0;
+ t->child[1]=c1;
+ t->child[2]=c2;
+ return t;
+}
+tree *mung1(tree *t, tree *c0)
+{
+ t->child[0]=c0;
+ return t;
+}
+tree *mung2(tree *t, tree *c0, tree *c1)
+{
+ t->child[0]=c0;
+ t->child[1]=c1;
+ return t;
+}
+tree *mung3(tree *t, tree *c0, tree *c1, tree *c2)
+{
+ t->child[0]=c0;
+ t->child[1]=c1;
+ t->child[2]=c2;
+ return t;
+}
+tree *epimung(tree *comp, tree *epi)
+{
+ tree *p;
+ if(epi==0) return comp;
+ for(p=epi;p->child[1];p=p->child[1]);
+ p->child[1]=comp;
+ return epi;
+}
+/*
+ * Add a SIMPLE node at the root of t and percolate all the redirections
+ * up to the root.
+ */
+tree *simplemung(tree *t)
+{
+ tree *u;
+ struct io *s;
+ t=tree1(SIMPLE, t);
+ s=openstr();
+ pfmt(s, "%t", t);
+ t->str=strdup(s->strp);
+ closeio(s);
+ for(u=t->child[0];u->type==ARGLIST;u=u->child[0]){
+ if(u->child[1]->type==DUP
+ || u->child[1]->type==REDIR){
+ u->child[1]->child[1]=t;
+ t=u->child[1];
+ u->child[1]=0;
+ }
+ }
+ return t;
+}
+tree *token(char *str, int type)
+{
+ tree *t=newtree();
+ t->type=type;
+ t->str=strdup(str);
+ return t;
+}
+void freetree(tree *p)
+{
+ if(p==0) return;
+ freetree(p->child[0]);
+ freetree(p->child[1]);
+ freetree(p->child[2]);
+ if(p->str) efree(p->str);
+ efree((char *)p);
+}
DIR diff --git a/src/cmd/rc/var.c b/src/cmd/rc/var.c
t@@ -0,0 +1,71 @@
+#include "rc.h"
+#include "exec.h"
+#include "fns.h"
+int hash(char *s, int n)
+{
+ register int h=0, i=1;
+ while(*s) h+=*s++*i++;
+ h%=n;
+ return h<0?h+n:h;
+}
+#define NKW 30
+struct kw{
+ char *name;
+ int type;
+ struct kw *next;
+}*kw[NKW];
+void kenter(int type, char *name)
+{
+ register int h=hash(name, NKW);
+ register struct kw *p=new(struct kw);
+ p->type=type;
+ p->name=name;
+ p->next=kw[h];
+ kw[h]=p;
+}
+void kinit(void){
+ kenter(FOR, "for");
+ kenter(IN, "in");
+ kenter(WHILE, "while");
+ kenter(IF, "if");
+ kenter(NOT, "not");
+ kenter(TWIDDLE, "~");
+ kenter(BANG, "!");
+ kenter(SUBSHELL, "@");
+ kenter(SWITCH, "switch");
+ kenter(FN, "fn");
+}
+tree *klook(char *name)
+{
+ struct kw *p;
+ tree *t=token(name, WORD);
+ for(p=kw[hash(name, NKW)];p;p=p->next)
+ if(strcmp(p->name, name)==0){
+ t->type=p->type;
+ t->iskw=1;
+ break;
+ }
+ return t;
+}
+var *gvlook(char *name)
+{
+ int h=hash(name, NVAR);
+ var *v;
+ for(v=gvar[h];v;v=v->next) if(strcmp(v->name, name)==0) return v;
+ return gvar[h]=newvar(strdup(name), gvar[h]);
+}
+var *vlook(char *name)
+{
+ var *v;
+ if(runq)
+ for(v=runq->local;v;v=v->next)
+ if(strcmp(v->name, name)==0) return v;
+ return gvlook(name);
+}
+void setvar(char *name, word *val)
+{
+ register struct var *v=vlook(name);
+ freewords(v->val);
+ v->val=val;
+ v->changed=1;
+}