Commit | Line | Data |
---|---|---|
862515b8 TL |
1 | # |
2 | /* | |
3 | * UNIX shell | |
4 | * | |
5 | * S. R. Bourne | |
6 | * Bell Telephone Laboratories | |
7 | * | |
8 | */ | |
9 | ||
10 | #include "defs.h" | |
11 | ||
12 | ||
13 | PROC VOID gsort(); | |
14 | ||
15 | #define ARGMK 01 | |
16 | ||
17 | INT errno; | |
18 | STRING sysmsg[]; | |
19 | ||
20 | /* fault handling */ | |
21 | #define ENOMEM 12 | |
22 | #define ENOEXEC 8 | |
23 | #define E2BIG 7 | |
24 | #define ENOENT 2 | |
25 | #define ETXTBSY 26 | |
26 | ||
27 | ||
28 | ||
29 | /* service routines for `execute' */ | |
30 | ||
31 | VOID initio(iop) | |
32 | IOPTR iop; | |
33 | { | |
34 | REG STRING ion; | |
35 | REG INT iof, fd; | |
36 | ||
37 | IF iop | |
38 | THEN iof=iop->iofile; | |
39 | ion=mactrim(iop->ioname); | |
40 | IF *ion ANDF (flags&noexec)==0 | |
41 | THEN IF iof&IODOC | |
42 | THEN subst(chkopen(ion),(fd=tmpfil())); | |
43 | close(fd); fd=chkopen(tmpout); unlink(tmpout); | |
44 | ELIF iof&IOMOV | |
45 | THEN IF eq(minus,ion) | |
46 | THEN fd = -1; | |
47 | close(iof&IOUFD); | |
48 | ELIF (fd=stoi(ion))>=USERIO | |
49 | THEN failed(ion,badfile); | |
50 | ELSE fd=dup(fd); | |
51 | FI | |
52 | ELIF (iof&IOPUT)==0 | |
53 | THEN fd=chkopen(ion); | |
54 | ELIF flags&rshflg | |
55 | THEN failed(ion,restricted); | |
56 | ELIF iof&IOAPP ANDF (fd=open(ion,1))>=0 | |
57 | THEN lseek(fd, 0L, 2); | |
58 | ELSE fd=create(ion); | |
59 | FI | |
60 | IF fd>=0 | |
61 | THEN rename(fd,iof&IOUFD); | |
62 | FI | |
63 | FI | |
64 | initio(iop->ionxt); | |
65 | FI | |
66 | } | |
67 | ||
68 | STRING getpath(s) | |
69 | STRING s; | |
70 | { | |
71 | REG STRING path; | |
72 | IF any('/',s) | |
73 | THEN IF flags&rshflg | |
74 | THEN failed(s, restricted); | |
75 | ELSE return(nullstr); | |
76 | FI | |
77 | ELIF (path = pathnod.namval)==0 | |
78 | THEN return(defpath); | |
79 | ELSE return(cpystak(path)); | |
80 | FI | |
81 | } | |
82 | ||
83 | INT pathopen(path, name) | |
84 | REG STRING path, name; | |
85 | { | |
86 | REG UFD f; | |
87 | ||
88 | REP path=catpath(path,name); | |
89 | PER (f=open(curstak(),0))<0 ANDF path DONE | |
90 | return(f); | |
91 | } | |
92 | ||
93 | STRING catpath(path,name) | |
94 | REG STRING path; | |
95 | STRING name; | |
96 | { | |
97 | /* leaves result on top of stack */ | |
98 | REG STRING scanp = path, | |
99 | argp = locstak(); | |
100 | ||
101 | WHILE *scanp ANDF *scanp!=COLON DO *argp++ = *scanp++ OD | |
102 | IF scanp!=path THEN *argp++='/' FI | |
103 | IF *scanp==COLON THEN scanp++ FI | |
104 | path=(*scanp ? scanp : 0); scanp=name; | |
105 | WHILE (*argp++ = *scanp++) DONE | |
106 | return(path); | |
107 | } | |
108 | ||
109 | LOCAL STRING xecmsg; | |
110 | LOCAL STRING *xecenv; | |
111 | ||
112 | VOID execa(at) | |
113 | STRING at[]; | |
114 | { | |
115 | REG STRING path; | |
116 | REG STRING *t = at; | |
117 | ||
118 | IF (flags&noexec)==0 | |
119 | THEN xecmsg=notfound; path=getpath(*t); | |
120 | namscan(exname); | |
121 | xecenv=setenv(); | |
122 | WHILE path=execs(path,t) DONE | |
123 | failed(*t,xecmsg); | |
124 | FI | |
125 | } | |
126 | ||
127 | LOCAL STRING execs(ap,t) | |
128 | STRING ap; | |
129 | REG STRING t[]; | |
130 | { | |
131 | REG STRING p, prefix; | |
132 | ||
133 | prefix=catpath(ap,t[0]); | |
134 | trim(p=curstak()); | |
135 | ||
136 | sigchk(); | |
137 | execve(p, &t[0] ,xecenv); | |
138 | SWITCH errno IN | |
139 | ||
140 | case ENOEXEC: | |
141 | flags=0; | |
142 | comdiv=0; ioset=0; | |
143 | clearup(); /* remove open files and for loop junk */ | |
144 | IF input THEN close(input) FI | |
145 | close(output); output=2; | |
146 | input=chkopen(p); | |
147 | ||
148 | /* set up new args */ | |
149 | setargs(t); | |
150 | longjmp(subshell,1); | |
151 | ||
152 | case ENOMEM: | |
153 | failed(p,toobig); | |
154 | ||
155 | case E2BIG: | |
156 | failed(p,arglist); | |
157 | ||
158 | case ETXTBSY: | |
159 | failed(p,txtbsy); | |
160 | ||
161 | default: | |
162 | xecmsg=badexec; | |
163 | case ENOENT: | |
164 | return(prefix); | |
165 | ENDSW | |
166 | } | |
167 | ||
168 | /* for processes to be waited for */ | |
169 | #define MAXP 20 | |
170 | LOCAL INT pwlist[MAXP]; | |
171 | LOCAL INT pwc; | |
172 | ||
173 | postclr() | |
174 | { | |
175 | REG INT *pw = pwlist; | |
176 | ||
177 | WHILE pw <= &pwlist[pwc] | |
178 | DO *pw++ = 0 OD | |
179 | pwc=0; | |
180 | } | |
181 | ||
182 | VOID post(pcsid) | |
183 | INT pcsid; | |
184 | { | |
185 | REG INT *pw = pwlist; | |
186 | ||
187 | IF pcsid | |
188 | THEN WHILE *pw DO pw++ OD | |
189 | IF pwc >= MAXP-1 | |
190 | THEN pw--; | |
191 | ELSE pwc++; | |
192 | FI | |
193 | *pw = pcsid; | |
194 | FI | |
195 | } | |
196 | ||
197 | VOID await(i) | |
198 | INT i; | |
199 | { | |
200 | INT rc=0, wx=0; | |
201 | INT w; | |
202 | INT ipwc = pwc; | |
203 | ||
204 | post(i); | |
205 | WHILE pwc | |
206 | DO REG INT p; | |
207 | REG INT sig; | |
208 | INT w_hi; | |
209 | ||
210 | BEGIN | |
211 | REG INT *pw=pwlist; | |
212 | p=wait(&w); | |
213 | WHILE pw <= &pwlist[ipwc] | |
214 | DO IF *pw==p | |
215 | THEN *pw=0; pwc--; | |
216 | ELSE pw++; | |
217 | FI | |
218 | OD | |
219 | END | |
220 | ||
221 | IF p == -1 THEN continue FI | |
222 | ||
223 | w_hi = (w>>8)&LOBYTE; | |
224 | ||
225 | IF sig = w&0177 | |
226 | THEN IF sig == 0177 /* ptrace! return */ | |
227 | THEN prs("ptrace: "); | |
228 | sig = w_hi; | |
229 | FI | |
230 | IF sysmsg[sig] | |
231 | THEN IF i!=p ORF (flags&prompt)==0 THEN prp(); prn(p); blank() FI | |
232 | prs(sysmsg[sig]); | |
233 | IF w&0200 THEN prs(coredump) FI | |
234 | FI | |
235 | newline(); | |
236 | FI | |
237 | ||
238 | IF rc==0 | |
239 | THEN rc = (sig ? sig|SIGFLG : w_hi); | |
240 | FI | |
241 | wx |= w; | |
242 | OD | |
243 | ||
244 | IF wx ANDF flags&errflg | |
245 | THEN exitsh(rc); | |
246 | FI | |
247 | exitval=rc; exitset(); | |
248 | } | |
249 | ||
250 | BOOL nosubst; | |
251 | ||
252 | trim(at) | |
253 | STRING at; | |
254 | { | |
255 | REG STRING p; | |
256 | REG CHAR c; | |
257 | REG CHAR q=0; | |
258 | ||
259 | IF p=at | |
260 | THEN WHILE c = *p | |
261 | DO *p++=c&STRIP; q |= c OD | |
262 | FI | |
263 | nosubst=q"E; | |
264 | } | |
265 | ||
266 | STRING mactrim(s) | |
267 | STRING s; | |
268 | { | |
269 | REG STRING t=macro(s); | |
270 | trim(t); | |
271 | return(t); | |
272 | } | |
273 | ||
274 | STRING *scan(argn) | |
275 | INT argn; | |
276 | { | |
277 | REG ARGPTR argp = Rcheat(gchain)&~ARGMK; | |
278 | REG STRING *comargn, *comargm; | |
279 | ||
280 | comargn=getstak(BYTESPERWORD*argn+BYTESPERWORD); comargm = comargn += argn; *comargn = ENDARGS; | |
281 | ||
282 | WHILE argp | |
283 | DO *--comargn = argp->argval; | |
284 | IF argp = argp->argnxt | |
285 | THEN trim(*comargn); | |
286 | FI | |
287 | IF argp==0 ORF Rcheat(argp)&ARGMK | |
288 | THEN gsort(comargn,comargm); | |
289 | comargm = comargn; | |
290 | FI | |
291 | /* Lcheat(argp) &= ~ARGMK; */ | |
292 | argp = Rcheat(argp)&~ARGMK; | |
293 | OD | |
294 | return(comargn); | |
295 | } | |
296 | ||
297 | LOCAL VOID gsort(from,to) | |
298 | STRING from[], to[]; | |
299 | { | |
300 | INT k, m, n; | |
301 | REG INT i, j; | |
302 | ||
303 | IF (n=to-from)<=1 THEN return FI | |
304 | ||
305 | FOR j=1; j<=n; j*=2 DONE | |
306 | ||
307 | FOR m=2*j-1; m/=2; | |
308 | DO k=n-m; | |
309 | FOR j=0; j<k; j++ | |
310 | DO FOR i=j; i>=0; i-=m | |
311 | DO REG STRING *fromi; fromi = &from[i]; | |
312 | IF cf(fromi[m],fromi[0])>0 | |
313 | THEN break; | |
314 | ELSE STRING s; s=fromi[m]; fromi[m]=fromi[0]; fromi[0]=s; | |
315 | FI | |
316 | OD | |
317 | OD | |
318 | OD | |
319 | } | |
320 | ||
321 | /* Argument list generation */ | |
322 | ||
323 | INT getarg(ac) | |
324 | COMPTR ac; | |
325 | { | |
326 | REG ARGPTR argp; | |
327 | REG INT count=0; | |
328 | REG COMPTR c; | |
329 | ||
330 | IF c=ac | |
331 | THEN argp=c->comarg; | |
332 | WHILE argp | |
333 | DO count += split(macro(argp->argval)); | |
334 | argp=argp->argnxt; | |
335 | OD | |
336 | FI | |
337 | return(count); | |
338 | } | |
339 | ||
340 | LOCAL INT split(s) | |
341 | REG STRING s; | |
342 | { | |
343 | REG STRING argp; | |
344 | REG INT c; | |
345 | INT count=0; | |
346 | ||
347 | LOOP sigchk(); argp=locstak()+BYTESPERWORD; | |
348 | WHILE (c = *s++, !any(c,ifsnod.namval) && c) | |
349 | DO *argp++ = c OD | |
350 | IF argp==staktop+BYTESPERWORD | |
351 | THEN IF c | |
352 | THEN continue; | |
353 | ELSE return(count); | |
354 | FI | |
355 | ELIF c==0 | |
356 | THEN s--; | |
357 | FI | |
358 | IF c=expand((argp=endstak(argp))->argval,0) | |
359 | THEN count += c; | |
360 | ELSE /* assign(&fngnod, argp->argval); */ | |
361 | makearg(argp); count++; | |
362 | FI | |
363 | Lcheat(gchain) |= ARGMK; | |
364 | POOL | |
365 | } |