[unix-history] / usr / src / old / sh / service.c

#ifndef lint
static char sccsid[] = "@(#)service.c	4.6 %G%";
#endif

#
/*
 * UNIX shell
 *
 * S. R. Bourne
 * Bell Telephone Laboratories
 *
 */

#include	"defs.h"
#include	"errno.h"


PROC VOID	gsort();

#define ARGMK	01

INT		errno;
STRING		sysmsg[];
INT		num_sysmsg;

/* service routines for `execute' */

VOID	initio(iop)
	IOPTR		iop;
{
	REG STRING	ion;
	REG INT		iof, fd;

	IF iop
	THEN	iof=iop->iofile;
		ion=mactrim(iop->ioname);
		IF *ion ANDF (flags&noexec)==0
		THEN	IF iof&IODOC
			THEN	subst(chkopen(ion),(fd=tmpfil()));
				close(fd); fd=chkopen(tmpout); unlink(tmpout);
			ELIF iof&IOMOV
			THEN	IF eq(minus,ion)
				THEN	fd = -1;
					close(iof&IOUFD);
				ELIF (fd=stoi(ion))>=USERIO
				THEN	failed(ion,badfile);
				ELSE	fd=dup(fd);
				FI
			ELIF (iof&IOPUT)==0
			THEN	fd=chkopen(ion);
			ELIF flags&rshflg
			THEN	failed(ion,restricted);
			ELIF iof&IOAPP ANDF (fd=open(ion,1))>=0
			THEN	lseek(fd, 0L, 2);
			ELSE	fd=create(ion);
			FI
			IF fd>=0
			THEN	rename(fd,iof&IOUFD);
			FI
		FI
		initio(iop->ionxt);
	FI
}

STRING	getpath(s)
	STRING		s;
{
	REG STRING	path;
	IF any('/',s)
	THEN	IF flags&rshflg
		THEN	failed(s, restricted);
		ELSE	return(nullstr);
		FI
	ELIF (path = pathnod.namval)==0
	THEN	return(defpath);
	ELSE	return(cpystak(path));
	FI
}

INT	pathopen(path, name)
	REG STRING	path, name;
{
	REG UFD		f;

	REP path=catpath(path,name);
	PER (f=open(curstak(),0))<0 ANDF path DONE
	return(f);
}

STRING	catpath(path,name)
	REG STRING	path;
	STRING		name;
{
	/* leaves result on top of stack */
	REG STRING	scanp = path,
			argp = locstak();

	WHILE *scanp ANDF *scanp!=COLON DO *argp++ = *scanp++ OD
	IF scanp!=path THEN *argp++='/' FI
	IF *scanp==COLON THEN scanp++ FI
	path=(*scanp ? scanp : 0); scanp=name;
	WHILE (*argp++ = *scanp++) DONE
	return(path);
}

LOCAL STRING	xecmsg;
LOCAL STRING	*xecenv;

VOID	execa(at)
	STRING		at[];
{
	REG STRING	path;
	REG STRING	*t = at;

	IF (flags&noexec)==0
	THEN	xecmsg=notfound; path=getpath(*t);
		namscan(exname);
		xecenv=setenv();
		WHILE path=execs(path,t) DONE
		failed(*t,xecmsg);
	FI
}

LOCAL STRING	execs(ap,t)
	STRING		ap;
	REG STRING	t[];
{
	REG STRING	p, prefix;

	prefix=catpath(ap,t[0]);
	trim(p=curstak());

	sigchk();
	execve(p, &t[0] ,xecenv);
	SWITCH errno IN

	    case ENOEXEC:
		flags=0;
		comdiv=0; ioset=0;
		clearup(); /* remove open files and for loop junk */
		IF input THEN close(input) FI
		close(output); output=2;
		input=chkopen(p);

		/* band aid to get csh... 2/26/79 */
		{
			char c;
			if (!isatty(input)) {
				read(input, &c, 1);
				if (c == '#')
					gocsh(t, p, xecenv);
				lseek(input, (long) 0, 0);
			}
		}

		/* set up new args */
		setargs(t);
		longjmp(subshell,1);

	    case ENOMEM:
		failed(p,toobig);

	    case E2BIG:
		failed(p,arglist);

	    case ETXTBSY:
		failed(p,txtbsy);

	    default:
		xecmsg=badexec;
	    case ENOENT:
		return(prefix);
	ENDSW
}

gocsh(t, cp, xecenv)
	register char **t, *cp, **xecenv;
{
	char **newt[1000];
	register char **p;
	register int i;

	for (i = 0; t[i]; i++)
		newt[i+1] = t[i];
	newt[i+1] = 0;
	newt[0] = "/bin/csh";
	newt[1] = cp;
	execve("/bin/csh", newt, xecenv);
}

/* for processes to be waited for */
#define MAXP 20
LOCAL INT	pwlist[MAXP];
LOCAL INT	pwc;

postclr()
{
	REG INT		*pw = pwlist;

	WHILE pw <= &pwlist[pwc]
	DO *pw++ = 0 OD
	pwc=0;
}

VOID	post(pcsid)
	INT		pcsid;
{
	REG INT		*pw = pwlist;

	IF pcsid
	THEN	WHILE *pw DO pw++ OD
		IF pwc >= MAXP-1
		THEN	pw--;
		ELSE	pwc++;
		FI
		*pw = pcsid;
	FI
}

VOID	await(i)
	INT		i;
{
	INT		rc=0, wx=0;
	INT		w;
	INT		ipwc = pwc;

	post(i);
	WHILE pwc
	DO	REG INT		p;
		REG INT		sig;
		INT		w_hi;

		BEGIN
		   REG INT	*pw=pwlist;
 		   IF setjmp(INTbuf) == 0
 		   THEN	trapjmp[INTR] = 1; p=wait(&w);
 		   ELSE	p = -1;
 		   FI
 		   trapjmp[INTR] = 0;
		   WHILE pw <= &pwlist[ipwc]
		   DO IF *pw==p
		      THEN *pw=0; pwc--;
		      ELSE pw++;
		      FI
		   OD
		END

		IF p == -1 THEN continue FI

		w_hi = (w>>8)&LOBYTE;

		IF sig = w&0177
		THEN	IF sig == 0177	/* ptrace! return */
			THEN	prs("ptrace: ");
				sig = w_hi;
			FI
			IF sig < num_sysmsg ANDF sysmsg[sig]
			THEN	IF i!=p ORF (flags&prompt)==0
				THEN prp(); prn(p); blank()
				FI
				prs(sysmsg[sig]);
				IF w&0200 THEN prs(coredump) FI
			FI
			newline();
		FI

		IF rc==0
		THEN	rc = (sig ? sig|SIGFLG : w_hi);
		FI
		wx |= w;
	OD

	IF wx ANDF flags&errflg
	THEN	exitsh(rc);
	FI
	exitval=rc; exitset();
}

BOOL		nosubst;

trim(at)
	STRING		at;
{
	REG STRING	p;
	REG CHAR	c;
	REG CHAR	q=0;

	IF p=at
	THEN	WHILE c = *p
		DO *p++=c&STRIP; q |= c OD
	FI
	nosubst=q&QUOTE;
}

STRING	mactrim(s)
	STRING		s;
{
	REG STRING	t=macro(s);
	trim(t);
	return(t);
}

STRING	*scan(argn)
	INT		argn;
{
	REG ARGPTR	argp = Rcheat(gchain)&~ARGMK;
	REG STRING	*comargn, *comargm;

	comargn=getstak(BYTESPERWORD*argn+BYTESPERWORD); comargm = comargn += argn; *comargn = ENDARGS;

	WHILE argp
	DO	*--comargn = argp->argval;
		IF argp = argp->argnxt
		THEN trim(*comargn);
		FI
		IF argp==0 ORF Rcheat(argp)&ARGMK
		THEN	gsort(comargn,comargm);
			comargm = comargn;
		FI
		/* Lcheat(argp) &= ~ARGMK; */
		argp = Rcheat(argp)&~ARGMK;
	OD
	return(comargn);
}

LOCAL VOID	gsort(from,to)
	STRING		from[], to[];
{
	INT		k, m, n;
	REG INT		i, j;

	IF (n=to-from)<=1 THEN return FI

	FOR j=1; j<=n; j*=2 DONE

	FOR m=2*j-1; m/=2;
	DO  k=n-m;
	    FOR j=0; j<k; j++
	    DO	FOR i=j; i>=0; i-=m
		DO  REG STRING *fromi; fromi = &from[i];
		    IF cf(fromi[m],fromi[0])>0
		    THEN break;
		    ELSE STRING s; s=fromi[m]; fromi[m]=fromi[0]; fromi[0]=s;
		    FI
		OD
	    OD
	OD
}

/* Argument list generation */

INT	getarg(ac)
	COMPTR		ac;
{
	REG ARGPTR	argp;
	REG INT		count=0;
	REG COMPTR	c;

	IF c=ac
	THEN	argp=c->comarg;
		WHILE argp
		DO	count += split(macro(argp->argval));
			argp=argp->argnxt;
		OD
	FI
	return(count);
}

LOCAL INT	split(s)
	REG STRING	s;
{
	REG STRING	argp;
	REG INT		c;
	INT		count=0;

	LOOP	sigchk(); argp=locstak()+BYTESPERWORD;
		WHILE (c = *s++, !any(c,ifsnod.namval) && c)
		DO *argp++ = c OD
		IF argp==staktop+BYTESPERWORD
		THEN	IF c
			THEN	continue;
			ELSE	return(count);
			FI
		ELIF c==0
		THEN	s--;
		FI
		IF c=expand(((ARGPTR)(argp=endstak(argp)))->argval,0)
		THEN	count += c;
		ELSE	/* assign(&fngnod, argp->argval); */
			makearg(argp); count++;
		FI
		Lcheat(gchain) |= ARGMK;
	POOL
}
Commit	Line	Data
f6227721	1	#ifndef lint
0a805fe4	2	static char sccsid[] = "@(#)service.c 4.6 %G%";
f6227721	3	#endif
852d162d KM	4
	5	#
	6	/*
	7	* UNIX shell
	8	*
	9	* S. R. Bourne
	10	* Bell Telephone Laboratories
	11	*
	12	*/
	13
	14	#include "defs.h"
0a805fe4	15	#include "errno.h"
852d162d KM	16
	17
	18	PROC VOID gsort();
	19
	20	#define ARGMK 01
	21
	22	INT errno;
	23	STRING sysmsg[];
57005db7	24	INT num_sysmsg;
852d162d	25
852d162d KM	26	/* service routines for `execute' */
	27
	28	VOID initio(iop)
	29	IOPTR iop;
	30	{
	31	REG STRING ion;
	32	REG INT iof, fd;
	33
	34	IF iop
	35	THEN iof=iop->iofile;
	36	ion=mactrim(iop->ioname);
	37	IF *ion ANDF (flags&noexec)==0
	38	THEN IF iof&IODOC
	39	THEN subst(chkopen(ion),(fd=tmpfil()));
	40	close(fd); fd=chkopen(tmpout); unlink(tmpout);
	41	ELIF iof&IOMOV
	42	THEN IF eq(minus,ion)
	43	THEN fd = -1;
	44	close(iof&IOUFD);
	45	ELIF (fd=stoi(ion))>=USERIO
	46	THEN failed(ion,badfile);
	47	ELSE fd=dup(fd);
	48	FI
	49	ELIF (iof&IOPUT)==0
	50	THEN fd=chkopen(ion);
	51	ELIF flags&rshflg
	52	THEN failed(ion,restricted);
	53	ELIF iof&IOAPP ANDF (fd=open(ion,1))>=0
	54	THEN lseek(fd, 0L, 2);
	55	ELSE fd=create(ion);
	56	FI
	57	IF fd>=0
	58	THEN rename(fd,iof&IOUFD);
	59	FI
	60	FI
	61	initio(iop->ionxt);
	62	FI
	63	}
	64
	65	STRING getpath(s)
	66	STRING s;
	67	{
	68	REG STRING path;
	69	IF any('/',s)
	70	THEN IF flags&rshflg
	71	THEN failed(s, restricted);
	72	ELSE return(nullstr);
	73	FI
	74	ELIF (path = pathnod.namval)==0
	75	THEN return(defpath);
	76	ELSE return(cpystak(path));
	77	FI
	78	}
	79
	80	INT pathopen(path, name)
	81	REG STRING path, name;
	82	{
	83	REG UFD f;
	84
	85	REP path=catpath(path,name);
	86	PER (f=open(curstak(),0))<0 ANDF path DONE
	87	return(f);
	88	}
	89
90	STRING catpath(path,name)
91	REG STRING path;
92	STRING name;
93	{
94	/* leaves result on top of stack */
95	REG STRING scanp = path,
96	argp = locstak();
97
98	WHILE scanp ANDF scanp!=COLON DO argp++ = scanp++ OD
99	IF scanp!=path THEN *argp++='/' FI
100	IF *scanp==COLON THEN scanp++ FI
101	path=(*scanp ? scanp : 0); scanp=name;
102	WHILE (argp++ = scanp++) DONE
103	return(path);
104	}
105
106	LOCAL STRING xecmsg;
107	LOCAL STRING *xecenv;
108
109	VOID execa(at)
110	STRING at[];
111	{
112	REG STRING path;
113	REG STRING *t = at;
114
115	IF (flags&noexec)==0
116	THEN xecmsg=notfound; path=getpath(*t);
117	namscan(exname);
118	xecenv=setenv();
119	WHILE path=execs(path,t) DONE
120	failed(*t,xecmsg);
121	FI
122	}
123
124	LOCAL STRING execs(ap,t)
125	STRING ap;
126	REG STRING t[];
127	{
128	REG STRING p, prefix;
129
130	prefix=catpath(ap,t[0]);
131	trim(p=curstak());
132
133	sigchk();
134	execve(p, &t[0] ,xecenv);
135	SWITCH errno IN
136
137	case ENOEXEC:
138	flags=0;
139	comdiv=0; ioset=0;
140	clearup(); /* remove open files and for loop junk */
141	IF input THEN close(input) FI
142	close(output); output=2;
143	input=chkopen(p);
144
145	/* band aid to get csh... 2/26/79 */
146	{
147	char c;
148	if (!isatty(input)) {
149	read(input, &c, 1);
150	if (c == '#')
151	gocsh(t, p, xecenv);
152	lseek(input, (long) 0, 0);
153	}
154	}
155
156	/* set up new args */
157	setargs(t);
158	longjmp(subshell,1);
159
160	case ENOMEM:
161	failed(p,toobig);
162
163	case E2BIG:
164	failed(p,arglist);
165
166	case ETXTBSY:
167	failed(p,txtbsy);
168
169	default:
170	xecmsg=badexec;
171	case ENOENT:
172	return(prefix);
173	ENDSW
174	}
175
176	gocsh(t, cp, xecenv)
177	register char *t, cp, **xecenv;
178	{
179	char **newt[1000];
180	register char **p;
181	register int i;
182
183	for (i = 0; t[i]; i++)
184	newt[i+1] = t[i];
185	newt[i+1] = 0;
186	newt[0] = "/bin/csh";
187	newt[1] = cp;
188	execve("/bin/csh", newt, xecenv);
189	}
190
191	/* for processes to be waited for */
192	#define MAXP 20
193	LOCAL INT pwlist[MAXP];
194	LOCAL INT pwc;
195
196	postclr()
197	{
198	REG INT *pw = pwlist;
199
200	WHILE pw <= &pwlist[pwc]
201	DO *pw++ = 0 OD
202	pwc=0;
203	}
204
205	VOID post(pcsid)
206	INT pcsid;
207	{
208	REG INT *pw = pwlist;
209
210	IF pcsid
211	THEN WHILE *pw DO pw++ OD
212	IF pwc >= MAXP-1
213	THEN pw--;
214	ELSE pwc++;
215	FI
216	*pw = pcsid;
217	FI
218	}
219
220	VOID await(i)
221	INT i;
222	{
223	INT rc=0, wx=0;
224	INT w;
225	INT ipwc = pwc;
226
227	post(i);
228	WHILE pwc
229	DO REG INT p;
230	REG INT sig;
231	INT w_hi;
232
233	BEGIN
234	REG INT *pw=pwlist;
c7cde447 KM	235	IF setjmp(INTbuf) == 0
	236	THEN trapjmp[INTR] = 1; p=wait(&w);
	237	ELSE p = -1;
	238	FI
	239	trapjmp[INTR] = 0;
852d162d KM	240	WHILE pw <= &pwlist[ipwc]
	241	DO IF *pw==p
	242	THEN *pw=0; pwc--;
	243	ELSE pw++;
	244	FI
	245	OD
	246	END
	247
	248	IF p == -1 THEN continue FI
	249
	250	w_hi = (w>>8)&LOBYTE;
	251
	252	IF sig = w&0177
	253	THEN IF sig == 0177 /* ptrace! return */
	254	THEN prs("ptrace: ");
	255	sig = w_hi;
	256	FI
57005db7 KM	257	IF sig < num_sysmsg ANDF sysmsg[sig]
	258	THEN IF i!=p ORF (flags&prompt)==0
	259	THEN prp(); prn(p); blank()
	260	FI
852d162d KM	261	prs(sysmsg[sig]);
	262	IF w&0200 THEN prs(coredump) FI
	263	FI
	264	newline();
	265	FI
	266
	267	IF rc==0
	268	THEN rc = (sig ? sig\|SIGFLG : w_hi);
	269	FI
	270	wx \|= w;
	271	OD
	272
	273	IF wx ANDF flags&errflg
	274	THEN exitsh(rc);
	275	FI
	276	exitval=rc; exitset();
	277	}
	278
	279	BOOL nosubst;
	280
	281	trim(at)
	282	STRING at;
	283	{
	284	REG STRING p;
	285	REG CHAR c;
	286	REG CHAR q=0;
	287
	288	IF p=at
	289	THEN WHILE c = *p
	290	DO *p++=c&STRIP; q \|= c OD
	291	FI
	292	nosubst=q&QUOTE;
	293	}
	294
	295	STRING mactrim(s)
	296	STRING s;
	297	{
	298	REG STRING t=macro(s);
	299	trim(t);
	300	return(t);
	301	}
	302
	303	STRING *scan(argn)
	304	INT argn;
	305	{
	306	REG ARGPTR argp = Rcheat(gchain)&~ARGMK;
	307	REG STRING comargn, comargm;
	308
	309	comargn=getstak(BYTESPERWORDargn+BYTESPERWORD); comargm = comargn += argn; comargn = ENDARGS;
	310
	311	WHILE argp
	312	DO *--comargn = argp->argval;
	313	IF argp = argp->argnxt
	314	THEN trim(*comargn);
	315	FI
	316	IF argp==0 ORF Rcheat(argp)&ARGMK
	317	THEN gsort(comargn,comargm);
	318	comargm = comargn;
	319	FI
	320	/* Lcheat(argp) &= ~ARGMK; */
	321	argp = Rcheat(argp)&~ARGMK;
	322	OD
	323	return(comargn);
	324	}
325
326	LOCAL VOID gsort(from,to)
327	STRING from[], to[];
328	{
329	INT k, m, n;
330	REG INT i, j;
331
332	IF (n=to-from)<=1 THEN return FI
333
334	FOR j=1; j<=n; j*=2 DONE
335
336	FOR m=2*j-1; m/=2;
337	DO k=n-m;
338	FOR j=0; j<k; j++
339	DO FOR i=j; i>=0; i-=m
340	DO REG STRING *fromi; fromi = &from[i];
341	IF cf(fromi[m],fromi[0])>0
342	THEN break;
343	ELSE STRING s; s=fromi[m]; fromi[m]=fromi[0]; fromi[0]=s;
344	FI
345	OD
346	OD
347	OD
348	}
349
350	/* Argument list generation */
351
352	INT getarg(ac)
353	COMPTR ac;
354	{
355	REG ARGPTR argp;
356	REG INT count=0;
357	REG COMPTR c;
358
359	IF c=ac
360	THEN argp=c->comarg;
361	WHILE argp
362	DO count += split(macro(argp->argval));
363	argp=argp->argnxt;
364	OD
365	FI
366	return(count);
367	}
368
369	LOCAL INT split(s)
370	REG STRING s;
371	{
372	REG STRING argp;
373	REG INT c;
374	INT count=0;
375
376	LOOP sigchk(); argp=locstak()+BYTESPERWORD;
377	WHILE (c = *s++, !any(c,ifsnod.namval) && c)
378	DO *argp++ = c OD
379	IF argp==staktop+BYTESPERWORD
380	THEN IF c
381	THEN continue;
382	ELSE return(count);
383	FI
384	ELIF c==0
385	THEN s--;
386	FI
3cc4dafe	387	IF c=expand(((ARGPTR)(argp=endstak(argp)))->argval,0)
852d162d KM	388	THEN count += c;
	389	ELSE /* assign(&fngnod, argp->argval); */
	390	makearg(argp); count++;
	391	FI
	392	Lcheat(gchain) \|= ARGMK;
	393	POOL
	394	}