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Plan 9's rc.

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not a clear win over byron's,
but at least it has the right syntax.
This commit is contained in:
rsc 2003-11-23 18:04:08 +00:00
parent 5993a8f275
commit f08fdedcee
24 changed files with 4688 additions and 0 deletions
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430
src/cmd/rc/code.c Normal file
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#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);
}

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src/cmd/rc/exec.c Normal file
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#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();
}

71
src/cmd/rc/exec.h Normal file
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/*
* 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 *);

162
src/cmd/rc/fmtquote.c Normal file
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/*
* 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;
}

58
src/cmd/rc/fns.h Normal file
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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);

217
src/cmd/rc/getflags.c Normal file
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/*% 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;
}
}

7
src/cmd/rc/getflags.h Normal file
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#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);

211
src/cmd/rc/glob.c Normal file
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#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;
}
}

212
src/cmd/rc/havefork.c Normal file
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#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;
}

211
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#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;
}

131
src/cmd/rc/here.c Normal file
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#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);
}
}

179
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#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;
}

24
src/cmd/rc/io.h Normal file
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@ -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*, ...);

322
src/cmd/rc/lex.c Normal file
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#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;
}

39
src/cmd/rc/mkfile Normal file
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@ -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

108
src/cmd/rc/pcmd.c Normal file
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#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;
}
}

67
src/cmd/rc/pfnc.c Normal file
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#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);
}

480
src/cmd/rc/plan9ish.c Normal file
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@ -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);
}

136
src/cmd/rc/rc.h Normal file
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/*
* Plan9 is defined for plan 9
* V9 is defined for 9th edition
* Sun is defined for sun-os
* Please don't litter the code with ifdefs. The three below (and one in
* getflags) should be enough.
*/
#define Plan9
#ifdef Plan9
#include <u.h>
#include <libc.h>
#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;

443
src/cmd/rc/simple.c Normal file
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/*
* 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();
}

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#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();
}

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#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());
}
}

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#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);
}

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#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;
}