Commit | Line | Data |
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f8e636e7 KM |
1 | /* xec.c 4.1 82/05/07 */ |
2 | ||
3 | # | |
4 | /* | |
5 | * UNIX shell | |
6 | * | |
7 | * S. R. Bourne | |
8 | * Bell Telephone Laboratories | |
9 | * | |
10 | */ | |
11 | ||
12 | #include "defs.h" | |
13 | #include "sym.h" | |
14 | ||
15 | LOCAL INT parent; | |
16 | ||
17 | SYSTAB commands; | |
18 | ||
19 | ||
20 | ||
21 | /* ======== command execution ========*/ | |
22 | ||
23 | ||
24 | execute(argt, execflg, pf1, pf2) | |
25 | TREPTR argt; | |
26 | INT *pf1, *pf2; | |
27 | { | |
28 | /* `stakbot' is preserved by this routine */ | |
29 | REG TREPTR t; | |
30 | STKPTR sav=savstak(); | |
31 | ||
32 | sigchk(); | |
33 | ||
34 | IF (t=argt) ANDF execbrk==0 | |
35 | THEN REG INT treeflgs; | |
36 | INT oldexit, type; | |
37 | REG STRING *com; | |
38 | ||
39 | treeflgs = t->tretyp; type = treeflgs&COMMSK; | |
40 | oldexit=exitval; exitval=0; | |
41 | ||
42 | SWITCH type IN | |
43 | ||
44 | case TCOM: | |
45 | BEGIN | |
46 | STRING a1; | |
47 | INT argn, internal; | |
48 | ARGPTR schain=gchain; | |
49 | IOPTR io=t->treio; | |
50 | gchain=0; | |
51 | argn = getarg(t); | |
52 | com=scan(argn); | |
53 | a1=com[1]; gchain=schain; | |
54 | ||
55 | IF (internal=syslook(com[0],commands)) ORF argn==0 | |
56 | THEN setlist(t->comset, 0); | |
57 | FI | |
58 | ||
59 | IF argn ANDF (flags&noexec)==0 | |
60 | THEN /* print command if execpr */ | |
61 | IF flags&execpr | |
62 | THEN argn=0; prs(execpmsg); | |
63 | WHILE com[argn]!=ENDARGS | |
64 | DO prs(com[argn++]); blank() OD | |
65 | newline(); | |
66 | FI | |
67 | ||
68 | SWITCH internal IN | |
69 | ||
70 | case SYSDOT: | |
71 | IF a1 | |
72 | THEN REG INT f; | |
73 | ||
74 | IF (f=pathopen(getpath(a1), a1)) < 0 | |
75 | THEN failed(a1,notfound); | |
76 | ELSE execexp(0,f); | |
77 | FI | |
78 | FI | |
79 | break; | |
80 | ||
81 | case SYSTIMES: | |
82 | { | |
83 | L_INT t[4]; times(t); | |
84 | prt(t[2]); blank(); prt(t[3]); newline(); | |
85 | } | |
86 | break; | |
87 | ||
88 | case SYSEXIT: | |
89 | exitsh(a1?stoi(a1):oldexit); | |
90 | ||
91 | case SYSNULL: | |
92 | io=0; | |
93 | break; | |
94 | ||
95 | case SYSCONT: | |
96 | execbrk = -loopcnt; break; | |
97 | ||
98 | case SYSBREAK: | |
99 | IF (execbrk=loopcnt) ANDF a1 | |
100 | THEN breakcnt=stoi(a1); | |
101 | FI | |
102 | break; | |
103 | ||
104 | case SYSTRAP: | |
105 | IF a1 | |
106 | THEN BOOL clear; | |
107 | IF (clear=digit(*a1))==0 | |
108 | THEN ++com; | |
109 | FI | |
110 | WHILE *++com | |
111 | DO INT i; | |
112 | IF (i=stoi(*com))>=MAXTRAP ORF i<MINTRAP | |
113 | THEN failed(*com,badtrap); | |
114 | ELIF clear | |
115 | THEN clrsig(i); | |
116 | ELSE replace(&trapcom[i],a1); | |
117 | IF *a1 | |
118 | THEN getsig(i); | |
119 | ELSE ignsig(i); | |
120 | FI | |
121 | FI | |
122 | OD | |
123 | ELSE /* print out current traps */ | |
124 | INT i; | |
125 | ||
126 | FOR i=0; i<MAXTRAP; i++ | |
127 | DO IF trapcom[i] | |
128 | THEN prn(i); prs(colon); prs(trapcom[i]); newline(); | |
129 | FI | |
130 | OD | |
131 | FI | |
132 | break; | |
133 | ||
134 | case SYSEXEC: | |
135 | com++; | |
136 | initio(io); ioset=0; io=0; | |
137 | IF a1==0 THEN break FI | |
138 | ||
139 | case SYSLOGIN: | |
140 | flags |= forked; | |
141 | oldsigs(); execa(com); done(); | |
142 | ||
143 | case SYSCD: | |
144 | IF flags&rshflg | |
145 | THEN failed(com[0],restricted); | |
146 | ELIF (a1==0 ANDF (a1=homenod.namval)==0) ORF chdir(a1)<0 | |
147 | THEN failed(a1,baddir); | |
148 | FI | |
149 | break; | |
150 | ||
151 | case SYSSHFT: | |
152 | IF dolc<1 | |
153 | THEN error(badshift); | |
154 | ELSE dolv++; dolc--; | |
155 | FI | |
156 | assnum(&dolladr, dolc); | |
157 | break; | |
158 | ||
159 | case SYSWAIT: | |
160 | await(-1); | |
161 | break; | |
162 | ||
163 | case SYSREAD: | |
164 | exitval=readvar(&com[1]); | |
165 | break; | |
166 | ||
167 | /* | |
168 | case SYSTST: | |
169 | exitval=testcmd(com); | |
170 | break; | |
171 | */ | |
172 | ||
173 | case SYSSET: | |
174 | IF a1 | |
175 | THEN INT argc; | |
176 | argc = options(argn,com); | |
177 | IF argc>1 | |
178 | THEN setargs(com+argn-argc); | |
179 | FI | |
180 | ELIF t->comset==0 | |
181 | THEN /*scan name chain and print*/ | |
182 | namscan(printnam); | |
183 | FI | |
184 | break; | |
185 | ||
186 | case SYSRDONLY: | |
187 | exitval=N_RDONLY; | |
188 | case SYSXPORT: | |
189 | IF exitval==0 THEN exitval=N_EXPORT; FI | |
190 | ||
191 | IF a1 | |
192 | THEN WHILE *++com | |
193 | DO attrib(lookup(*com), exitval) OD | |
194 | ELSE namscan(printflg); | |
195 | FI | |
196 | exitval=0; | |
197 | break; | |
198 | ||
199 | case SYSEVAL: | |
200 | IF a1 | |
201 | THEN execexp(a1,&com[2]); | |
202 | FI | |
203 | break; | |
204 | ||
205 | case SYSUMASK: | |
206 | if (a1) { | |
207 | int c, i | |
208 | i = 0; | |
209 | while ((c = *a1++) >= '0' && | |
210 | c <= '7') | |
211 | i = (i << 3) + c - '0'; | |
212 | umask(i); | |
213 | } else { | |
214 | int i, j; | |
215 | umask(i = umask(0)); | |
216 | prc('0'); | |
217 | for (j = 6; j >= 0; j -= 3) | |
218 | prc(((i>>j)&07) + '0'); | |
219 | newline(); | |
220 | } | |
221 | break; | |
222 | ||
223 | default: | |
224 | internal=builtin(argn,com); | |
225 | ||
226 | ENDSW | |
227 | ||
228 | IF internal | |
229 | THEN IF io THEN error(illegal) FI | |
230 | chktrap(); | |
231 | break; | |
232 | FI | |
233 | ELIF t->treio==0 | |
234 | THEN break; | |
235 | FI | |
236 | END | |
237 | ||
238 | case TFORK: | |
239 | IF execflg ANDF (treeflgs&(FAMP|FPOU))==0 | |
240 | THEN parent=0; | |
241 | ELSE WHILE (parent=fork()) == -1 | |
242 | DO sigchk(); alarm(10); pause() OD | |
243 | FI | |
244 | ||
245 | IF parent | |
246 | THEN /* This is the parent branch of fork; */ | |
247 | /* it may or may not wait for the child. */ | |
248 | IF treeflgs&FPRS ANDF flags&ttyflg | |
249 | THEN prn(parent); newline(); | |
250 | FI | |
251 | IF treeflgs&FPCL THEN closepipe(pf1) FI | |
252 | IF (treeflgs&(FAMP|FPOU))==0 | |
253 | THEN await(parent); | |
254 | ELIF (treeflgs&FAMP)==0 | |
255 | THEN post(parent); | |
256 | ELSE assnum(&pcsadr, parent); | |
257 | FI | |
258 | ||
259 | chktrap(); | |
260 | break; | |
261 | ||
262 | ||
263 | ELSE /* this is the forked branch (child) of execute */ | |
264 | flags |= forked; iotemp=0; | |
265 | postclr(); | |
266 | settmp(); | |
267 | ||
268 | /* Turn off INTR and QUIT if `FINT' */ | |
269 | /* Reset ramaining signals to parent */ | |
270 | /* except for those `lost' by trap */ | |
271 | oldsigs(); | |
272 | IF treeflgs&FINT | |
273 | THEN signal(INTR,1); signal(QUIT,1); | |
274 | FI | |
275 | ||
276 | /* pipe in or out */ | |
277 | IF treeflgs&FPIN | |
278 | THEN rename(pf1[INPIPE],0); | |
279 | close(pf1[OTPIPE]); | |
280 | FI | |
281 | IF treeflgs&FPOU | |
282 | THEN rename(pf2[OTPIPE],1); | |
283 | close(pf2[INPIPE]); | |
284 | FI | |
285 | ||
286 | /* default std input for & */ | |
287 | IF treeflgs&FINT ANDF ioset==0 | |
288 | THEN rename(chkopen(devnull),0); | |
289 | FI | |
290 | ||
291 | /* io redirection */ | |
292 | initio(t->treio); | |
293 | IF type!=TCOM | |
294 | THEN execute(t->forktre,1); | |
295 | ELIF com[0]!=ENDARGS | |
296 | THEN setlist(t->comset,N_EXPORT); | |
297 | execa(com); | |
298 | FI | |
299 | done(); | |
300 | FI | |
301 | ||
302 | case TPAR: | |
303 | rename(dup(2),output); | |
304 | execute(t->partre,execflg); | |
305 | done(); | |
306 | ||
307 | case TFIL: | |
308 | BEGIN | |
309 | INT pv[2]; chkpipe(pv); | |
310 | IF execute(t->lstlef, 0, pf1, pv)==0 | |
311 | THEN execute(t->lstrit, execflg, pv, pf2); | |
312 | ELSE closepipe(pv); | |
313 | FI | |
314 | END | |
315 | break; | |
316 | ||
317 | case TLST: | |
318 | execute(t->lstlef,0); | |
319 | execute(t->lstrit,execflg); | |
320 | break; | |
321 | ||
322 | case TAND: | |
323 | IF execute(t->lstlef,0)==0 | |
324 | THEN execute(t->lstrit,execflg); | |
325 | FI | |
326 | break; | |
327 | ||
328 | case TORF: | |
329 | IF execute(t->lstlef,0)!=0 | |
330 | THEN execute(t->lstrit,execflg); | |
331 | FI | |
332 | break; | |
333 | ||
334 | case TFOR: | |
335 | BEGIN | |
336 | NAMPTR n = lookup(t->fornam); | |
337 | STRING *args; | |
338 | DOLPTR argsav=0; | |
339 | ||
340 | IF t->forlst==0 | |
341 | THEN args=dolv+1; | |
342 | argsav=useargs(); | |
343 | ELSE ARGPTR schain=gchain; | |
344 | gchain=0; | |
345 | trim((args=scan(getarg(t->forlst)))[0]); | |
346 | gchain=schain; | |
347 | FI | |
348 | loopcnt++; | |
349 | WHILE *args!=ENDARGS ANDF execbrk==0 | |
350 | DO assign(n,*args++); | |
351 | execute(t->fortre,0); | |
352 | IF execbrk<0 THEN execbrk=0 FI | |
353 | OD | |
354 | IF breakcnt THEN breakcnt-- FI | |
355 | execbrk=breakcnt; loopcnt--; | |
356 | argfor=freeargs(argsav); | |
357 | END | |
358 | break; | |
359 | ||
360 | case TWH: | |
361 | case TUN: | |
362 | BEGIN | |
363 | INT i=0; | |
364 | ||
365 | loopcnt++; | |
366 | WHILE execbrk==0 ANDF (execute(t->whtre,0)==0)==(type==TWH) | |
367 | DO i=execute(t->dotre,0); | |
368 | IF execbrk<0 THEN execbrk=0 FI | |
369 | OD | |
370 | IF breakcnt THEN breakcnt-- FI | |
371 | execbrk=breakcnt; loopcnt--; exitval=i; | |
372 | END | |
373 | break; | |
374 | ||
375 | case TIF: | |
376 | IF execute(t->iftre,0)==0 | |
377 | THEN execute(t->thtre,execflg); | |
378 | ELSE execute(t->eltre,execflg); | |
379 | FI | |
380 | break; | |
381 | ||
382 | case TSW: | |
383 | BEGIN | |
384 | REG STRING r = mactrim(t->swarg); | |
385 | t=t->swlst; | |
386 | WHILE t | |
387 | DO ARGPTR rex=t->regptr; | |
388 | WHILE rex | |
389 | DO REG STRING s; | |
390 | IF gmatch(r,s=macro(rex->argval)) ORF (trim(s), eq(r,s)) | |
391 | THEN execute(t->regcom,0); | |
392 | t=0; break; | |
393 | ELSE rex=rex->argnxt; | |
394 | FI | |
395 | OD | |
396 | IF t THEN t=t->regnxt FI | |
397 | OD | |
398 | END | |
399 | break; | |
400 | ENDSW | |
401 | exitset(); | |
402 | FI | |
403 | ||
404 | sigchk(); | |
405 | tdystak(sav); | |
406 | return(exitval); | |
407 | } | |
408 | ||
409 | ||
410 | execexp(s,f) | |
411 | STRING s; | |
412 | UFD f; | |
413 | { | |
414 | FILEBLK fb; | |
415 | push(&fb); | |
416 | IF s | |
417 | THEN estabf(s); fb.feval=f; | |
418 | ELIF f>=0 | |
419 | THEN initf(f); | |
420 | FI | |
421 | execute(cmd(NL, NLFLG|MTFLG),0); | |
422 | pop(); | |
423 | } |