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 | #include "sym.h" | |
12 | ||
13 | LOCAL INT parent; | |
14 | ||
15 | SYSTAB commands; | |
16 | ||
17 | ||
18 | ||
19 | /* ======== command execution ========*/ | |
20 | ||
21 | ||
22 | execute(argt, execflg, pf1, pf2) | |
23 | TREPTR argt; | |
24 | INT *pf1, *pf2; | |
25 | { | |
26 | /* `stakbot' is preserved by this routine */ | |
27 | REG TREPTR t; | |
28 | STKPTR sav=savstak(); | |
29 | ||
30 | sigchk(); | |
31 | ||
32 | IF (t=argt) ANDF execbrk==0 | |
33 | THEN REG INT treeflgs; | |
34 | INT oldexit, type; | |
35 | REG STRING *com; | |
36 | ||
37 | treeflgs = t->tretyp; type = treeflgs&COMMSK; | |
38 | oldexit=exitval; exitval=0; | |
39 | ||
40 | SWITCH type IN | |
41 | ||
42 | case TCOM: | |
43 | BEGIN | |
44 | STRING a1; | |
45 | INT argn, internal; | |
46 | ARGPTR schain=gchain; | |
47 | IOPTR io=t->treio; | |
48 | gchain=0; | |
49 | argn = getarg(t); | |
50 | com=scan(argn); | |
51 | a1=com[1]; gchain=schain; | |
52 | ||
53 | IF (internal=syslook(com[0],commands)) ORF argn==0 | |
54 | THEN setlist(t->comset, 0); | |
55 | FI | |
56 | ||
57 | IF argn ANDF (flags&noexec)==0 | |
58 | THEN /* print command if execpr */ | |
59 | IF flags&execpr | |
60 | THEN argn=0; prs(execpmsg); | |
61 | WHILE com[argn]!=ENDARGS | |
62 | DO prs(com[argn++]); blank() OD | |
63 | newline(); | |
64 | FI | |
65 | ||
66 | SWITCH internal IN | |
67 | ||
68 | case SYSDOT: | |
69 | IF a1 | |
70 | THEN REG INT f; | |
71 | ||
72 | IF (f=pathopen(getpath(a1), a1)) < 0 | |
73 | THEN failed(a1,notfound); | |
74 | ELSE execexp(0,f); | |
75 | FI | |
76 | FI | |
77 | break; | |
78 | ||
79 | case SYSTIMES: | |
80 | { | |
81 | L_INT t[4]; times(t); | |
82 | prt(t[2]); blank(); prt(t[3]); newline(); | |
83 | } | |
84 | break; | |
85 | ||
86 | case SYSEXIT: | |
87 | exitsh(a1?stoi(a1):oldexit); | |
88 | ||
89 | case SYSNULL: | |
90 | io=0; | |
91 | break; | |
92 | ||
93 | case SYSCONT: | |
94 | execbrk = -loopcnt; break; | |
95 | ||
96 | case SYSBREAK: | |
97 | IF (execbrk=loopcnt) ANDF a1 | |
98 | THEN breakcnt=stoi(a1); | |
99 | FI | |
100 | break; | |
101 | ||
102 | case SYSTRAP: | |
103 | IF a1 | |
104 | THEN BOOL clear; | |
105 | IF (clear=digit(*a1))==0 | |
106 | THEN ++com; | |
107 | FI | |
108 | WHILE *++com | |
109 | DO INT i; | |
110 | IF (i=stoi(*com))>=MAXTRAP ORF i<MINTRAP | |
111 | THEN failed(*com,badtrap); | |
112 | ELIF clear | |
113 | THEN clrsig(i); | |
114 | ELSE replace(&trapcom[i],a1); | |
115 | IF *a1 | |
116 | THEN getsig(i); | |
117 | ELSE ignsig(i); | |
118 | FI | |
119 | FI | |
120 | OD | |
121 | ELSE /* print out current traps */ | |
122 | INT i; | |
123 | ||
124 | FOR i=0; i<MAXTRAP; i++ | |
125 | DO IF trapcom[i] | |
126 | THEN prn(i); prs(colon); prs(trapcom[i]); newline(); | |
127 | FI | |
128 | OD | |
129 | FI | |
130 | break; | |
131 | ||
132 | case SYSEXEC: | |
133 | com++; | |
134 | initio(io); ioset=0; io=0; | |
135 | IF a1==0 THEN break FI | |
136 | ||
137 | case SYSLOGIN: | |
138 | flags |= forked; | |
139 | oldsigs(); execa(com); done(); | |
140 | ||
141 | case SYSCD: | |
142 | IF flags&rshflg | |
143 | THEN failed(com[0],restricted); | |
144 | ELIF (a1==0 ANDF (a1=homenod.namval)==0) ORF chdir(a1)<0 | |
145 | THEN failed(a1,baddir); | |
146 | FI | |
147 | break; | |
148 | ||
149 | case SYSSHFT: | |
150 | IF dolc<1 | |
151 | THEN error(badshift); | |
152 | ELSE dolv++; dolc--; | |
153 | FI | |
154 | assnum(&dolladr, dolc); | |
155 | break; | |
156 | ||
157 | case SYSWAIT: | |
158 | await(-1); | |
159 | break; | |
160 | ||
161 | case SYSREAD: | |
162 | exitval=readvar(&com[1]); | |
163 | break; | |
164 | ||
165 | /* | |
166 | case SYSTST: | |
167 | exitval=testcmd(com); | |
168 | break; | |
169 | */ | |
170 | ||
171 | case SYSSET: | |
172 | IF a1 | |
173 | THEN INT argc; | |
174 | argc = options(argn,com); | |
175 | IF argc>1 | |
176 | THEN setargs(com+argn-argc); | |
177 | FI | |
178 | ELIF t->comset==0 | |
179 | THEN /*scan name chain and print*/ | |
180 | namscan(printnam); | |
181 | FI | |
182 | break; | |
183 | ||
184 | case SYSRDONLY: | |
185 | exitval=N_RDONLY; | |
186 | case SYSXPORT: | |
187 | IF exitval==0 THEN exitval=N_EXPORT; FI | |
188 | ||
189 | IF a1 | |
190 | THEN WHILE *++com | |
191 | DO attrib(lookup(*com), exitval) OD | |
192 | ELSE namscan(printflg); | |
193 | FI | |
194 | exitval=0; | |
195 | break; | |
196 | ||
197 | case SYSEVAL: | |
198 | IF a1 | |
199 | THEN execexp(a1,&com[2]); | |
200 | FI | |
201 | break; | |
202 | ||
203 | case SYSUMASK: | |
204 | if (a1) { | |
205 | int c, i | |
206 | i = 0; | |
207 | while ((c = *a1++) >= '0' && | |
208 | c <= '7') | |
209 | i = (i << 3) + c - '0'; | |
210 | umask(i); | |
211 | } else { | |
212 | int i, j; | |
213 | umask(i = umask(0)); | |
214 | prc('0'); | |
215 | for (j = 6; j >= 0; j -= 3) | |
216 | prc(((i>>j)&07) + '0'); | |
217 | newline(); | |
218 | } | |
219 | break; | |
220 | ||
221 | default: | |
222 | internal=builtin(argn,com); | |
223 | ||
224 | ENDSW | |
225 | ||
226 | IF internal | |
227 | THEN IF io THEN error(illegal) FI | |
228 | chktrap(); | |
229 | break; | |
230 | FI | |
231 | ELIF t->treio==0 | |
232 | THEN break; | |
233 | FI | |
234 | END | |
235 | ||
236 | case TFORK: | |
237 | IF execflg ANDF (treeflgs&(FAMP|FPOU))==0 | |
238 | THEN parent=0; | |
239 | ELSE WHILE (parent=fork()) == -1 | |
240 | DO sigchk(); alarm(10); pause() OD | |
241 | FI | |
242 | ||
243 | IF parent | |
244 | THEN /* This is the parent branch of fork; */ | |
245 | /* it may or may not wait for the child. */ | |
246 | IF treeflgs&FPRS ANDF flags&ttyflg | |
247 | THEN prn(parent); newline(); | |
248 | FI | |
249 | IF treeflgs&FPCL THEN closepipe(pf1) FI | |
250 | IF (treeflgs&(FAMP|FPOU))==0 | |
251 | THEN await(parent); | |
252 | ELIF (treeflgs&FAMP)==0 | |
253 | THEN post(parent); | |
254 | ELSE assnum(&pcsadr, parent); | |
255 | FI | |
256 | ||
257 | chktrap(); | |
258 | break; | |
259 | ||
260 | ||
261 | ELSE /* this is the forked branch (child) of execute */ | |
262 | flags |= forked; iotemp=0; | |
263 | postclr(); | |
264 | settmp(); | |
265 | ||
266 | /* Turn off INTR and QUIT if `FINT' */ | |
267 | /* Reset ramaining signals to parent */ | |
268 | /* except for those `lost' by trap */ | |
269 | oldsigs(); | |
270 | IF treeflgs&FINT | |
271 | THEN signal(INTR,1); signal(QUIT,1); | |
272 | FI | |
273 | ||
274 | /* pipe in or out */ | |
275 | IF treeflgs&FPIN | |
276 | THEN rename(pf1[INPIPE],0); | |
277 | close(pf1[OTPIPE]); | |
278 | FI | |
279 | IF treeflgs&FPOU | |
280 | THEN rename(pf2[OTPIPE],1); | |
281 | close(pf2[INPIPE]); | |
282 | FI | |
283 | ||
284 | /* default std input for & */ | |
285 | IF treeflgs&FINT ANDF ioset==0 | |
286 | THEN rename(chkopen(devnull),0); | |
287 | FI | |
288 | ||
289 | /* io redirection */ | |
290 | initio(t->treio); | |
291 | IF type!=TCOM | |
292 | THEN execute(t->forktre,1); | |
293 | ELIF com[0]!=ENDARGS | |
294 | THEN setlist(t->comset,N_EXPORT); | |
295 | execa(com); | |
296 | FI | |
297 | done(); | |
298 | FI | |
299 | ||
300 | case TPAR: | |
301 | rename(dup(2),output); | |
302 | execute(t->partre,execflg); | |
303 | done(); | |
304 | ||
305 | case TFIL: | |
306 | BEGIN | |
307 | INT pv[2]; chkpipe(pv); | |
308 | IF execute(t->lstlef, 0, pf1, pv)==0 | |
309 | THEN execute(t->lstrit, execflg, pv, pf2); | |
310 | ELSE closepipe(pv); | |
311 | FI | |
312 | END | |
313 | break; | |
314 | ||
315 | case TLST: | |
316 | execute(t->lstlef,0); | |
317 | execute(t->lstrit,execflg); | |
318 | break; | |
319 | ||
320 | case TAND: | |
321 | IF execute(t->lstlef,0)==0 | |
322 | THEN execute(t->lstrit,execflg); | |
323 | FI | |
324 | break; | |
325 | ||
326 | case TORF: | |
327 | IF execute(t->lstlef,0)!=0 | |
328 | THEN execute(t->lstrit,execflg); | |
329 | FI | |
330 | break; | |
331 | ||
332 | case TFOR: | |
333 | BEGIN | |
334 | NAMPTR n = lookup(t->fornam); | |
335 | STRING *args; | |
336 | DOLPTR argsav=0; | |
337 | ||
338 | IF t->forlst==0 | |
339 | THEN args=dolv+1; | |
340 | argsav=useargs(); | |
341 | ELSE ARGPTR schain=gchain; | |
342 | gchain=0; | |
343 | trim((args=scan(getarg(t->forlst)))[0]); | |
344 | gchain=schain; | |
345 | FI | |
346 | loopcnt++; | |
347 | WHILE *args!=ENDARGS ANDF execbrk==0 | |
348 | DO assign(n,*args++); | |
349 | execute(t->fortre,0); | |
350 | IF execbrk<0 THEN execbrk=0 FI | |
351 | OD | |
352 | IF breakcnt THEN breakcnt-- FI | |
353 | execbrk=breakcnt; loopcnt--; | |
354 | argfor=freeargs(argsav); | |
355 | END | |
356 | break; | |
357 | ||
358 | case TWH: | |
359 | case TUN: | |
360 | BEGIN | |
361 | INT i=0; | |
362 | ||
363 | loopcnt++; | |
364 | WHILE execbrk==0 ANDF (execute(t->whtre,0)==0)==(type==TWH) | |
365 | DO i=execute(t->dotre,0); | |
366 | IF execbrk<0 THEN execbrk=0 FI | |
367 | OD | |
368 | IF breakcnt THEN breakcnt-- FI | |
369 | execbrk=breakcnt; loopcnt--; exitval=i; | |
370 | END | |
371 | break; | |
372 | ||
373 | case TIF: | |
374 | IF execute(t->iftre,0)==0 | |
375 | THEN execute(t->thtre,execflg); | |
376 | ELSE execute(t->eltre,execflg); | |
377 | FI | |
378 | break; | |
379 | ||
380 | case TSW: | |
381 | BEGIN | |
382 | REG STRING r = mactrim(t->swarg); | |
383 | t=t->swlst; | |
384 | WHILE t | |
385 | DO ARGPTR rex=t->regptr; | |
386 | WHILE rex | |
387 | DO REG STRING s; | |
388 | IF gmatch(r,s=macro(rex->argval)) ORF (trim(s), eq(r,s)) | |
389 | THEN execute(t->regcom,0); | |
390 | t=0; break; | |
391 | ELSE rex=rex->argnxt; | |
392 | FI | |
393 | OD | |
394 | IF t THEN t=t->regnxt FI | |
395 | OD | |
396 | END | |
397 | break; | |
398 | ENDSW | |
399 | exitset(); | |
400 | FI | |
401 | ||
402 | sigchk(); | |
403 | tdystak(sav); | |
404 | return(exitval); | |
405 | } | |
406 | ||
407 | ||
408 | execexp(s,f) | |
409 | STRING s; | |
410 | UFD f; | |
411 | { | |
412 | FILEBLK fb; | |
413 | push(&fb); | |
414 | IF s | |
415 | THEN estabf(s); fb.feval=f; | |
416 | ELIF f>=0 | |
417 | THEN initf(f); | |
418 | FI | |
419 | execute(cmd(NL, NLFLG|MTFLG),0); | |
420 | pop(); | |
421 | } |