ref: 53aac62a54ebbcc1781c0000d3e2384ed038c7bb
dir: /utils/rcsh/simple.c/
#include "rc.h"
typedef struct Builtin Builtin;
struct Builtin
{
char *name;
void (*fnc)(void);
};
int exitnext(void);
void execexec(void);
void execfunc(Var *func);
void execcd(void);
void execwhatis(void);
void execeval(void);
void execexit(void);
void execshift(void);
void execwait(void);
void execdot(void);
void execflag(void);
Builtin builtin[]={
"cd", execcd,
"whatis", execwhatis,
"eval", execeval,
"exec", execexec, /* but with popword first */
"exit", execexit,
"shift", execshift,
"wait", execwait,
".", execdot,
"flag", execflag,
0
};
int mapfd(int fd);
void
Xsimple(void)
{
Word *a;
Thread *p=runq;
Var *v;
Builtin *bp;
uint pid;
char **argv;
globlist();
a=runq->argv->words;
if(a==0){
Xerror("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;
}
}
updenv();
argv = procargv(0, 0, 0, 0, runq->argv->words);
pid = proc(argv, mapfd(0), mapfd(1), mapfd(2));
free(argv);
if(pid == 0)
pfmt(err, "%s: %r\n", runq->argv->words->word);
else
waitfor(pid);
poplist();
#ifdef XXX
if(exitnext()){
/* fork and wait is redundant */
pushword("exec");
execexec();
Xexit();
}
else{
flush(err);
updenv();
switch(pid=fork()){
case -1:
Xperror("try again");
return;
case 0:
pushword("exec");
execexec();
Exit("can't exec");
default:
poplist();
/* interrupts don't get us out */
while(Waitfor(pid, 1) < 0)
;
}
}
#endif
}
}
Word nullpath={ "", 0};
Word *
searchpath(char *w)
{
Word *path;
return &nullpath;
if(strncmp(w, "/", 1) == 0
|| strncmp(w, "#", 1) == 0
|| *w && w[1] == ':'
|| strncmp(w, "./", 2) == 0
|| strncmp(w, "../", 3) == 0
|| (path=vlook("path")->val) == 0)
path=&nullpath;
return path;
}
/*
* Search through the following code to see if we're just going to exit.
*/
int
exitnext(void)
{
Code *c=&runq->code[runq->pc];
while(c->f==Xpopredir)
c++;
return c->f==Xexit;
}
#ifdef XXX
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;
}
}
}
#endif
void
execexec(void)
{
popword(); /* "exec" */
if(runq->argv->words==0){
Xerror("empty argument list");
return;
}
fatal("execexec not done yet");
/*
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, runq->local);
runq->local=newvar(strdup("*"), runq->local);
runq->local->val=starval;
runq->local->changed=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(chdir(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\n", a->next->word);
break;
case 1:
a=vlook("home")->val;
if(count(a)>=1){
if(chdir(a->word)>=0)
setstatus("");
else
pfmt(err, "Can't cd %s\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
execflag(void)
{
char *letter, *val;
switch(count(runq->argv->words)){
case 2:
setstatus(flag[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[letter[0]]=1;
break;
}
if(strcmp(val, "-")==0){
flag[letter[0]]=0;
break;
}
}
default:
Xerror("Usage: flag [letter] [+-]");
return;
}
poplist();
}
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;
free(star->val->word);
free(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;
}
void
execeval(void)
{
char *cmdline, *s, *t;
int len=0;
Word *ap;
if(count(runq->argv->words)<=1){
Xerror("Usage: eval cmd ...");
return;
}
eflagok=1;
for(ap=runq->argv->words->next;ap;ap=ap->next)
len+=1+strlen(ap->word);
cmdline=malloc(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));
free(cmdline);
}
void
execdot(void)
{
int iflag=0;
int fd;
List *av;
Thread *p=runq;
char *zero;
char file[512];
Word *path;
static int first=1;
static Code dotcmds[14];
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){
Xerror("Usage: . [-i] file [arg ...]");
return;
}
zero=strdup(p->argv->words->word);
popword();
strcpy(file, "**No file name**");
fd = -1;
if(strcmp(zero, "stdin$") == 0)
fd = dup(0);
else{
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(fd<0){
Xperror(file);
return;
}
/* set up for a new command loop */
start(dotcmds, 1, 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;
free(av);
/* push $0 value */
pushlist();
pushword(zero);
ndot++;
}
void
execwhatis(void)
{ /* mildly wrong -- should fork before writing */
Word *a, *b, *path;
Var *v;
Builtin *bp;
char file[512];
Io out[1];
int found, sep;
a=runq->argv->words->next;
if(a==0){
Xerror("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);
#ifdef XXX
if(Executable(file)){
pfmt(out, "%s\n", file);
break;
}
#endif
}
if(!path && !found){
pfmt(err, "%s: not found\n", a->word);
setstatus("not found");
}
}
}
}
poplist();
flush(err);
}
void
execwait(void)
{
fprint(2, "wait: not done yet");
#ifdef XXX
switch(count(runq->argv->words)){
default: Xerror("Usage: wait [pid]"); return;
case 2: Waitfor(atoi(runq->argv->words->next->word), 0); break;
case 1: Waitfor(-1, 0); break;
}
poplist();
#endif
}
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;
}