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f6227721 | 1 | #ifndef lint |
399372bb | 2 | static char sccsid[] = "@(#)xec.c 4.4 %G%"; |
f6227721 | 3 | #endif |
f8e636e7 KM |
4 | |
5 | # | |
6 | /* | |
7 | * UNIX shell | |
8 | * | |
9 | * S. R. Bourne | |
10 | * Bell Telephone Laboratories | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "defs.h" | |
15 | #include "sym.h" | |
16 | ||
17 | LOCAL INT parent; | |
18 | ||
19 | SYSTAB commands; | |
20 | ||
21 | ||
22 | ||
23 | /* ======== command execution ========*/ | |
24 | ||
25 | ||
26 | execute(argt, execflg, pf1, pf2) | |
27 | TREPTR argt; | |
28 | INT *pf1, *pf2; | |
29 | { | |
30 | /* `stakbot' is preserved by this routine */ | |
31 | REG TREPTR t; | |
32 | STKPTR sav=savstak(); | |
33 | ||
34 | sigchk(); | |
35 | ||
36 | IF (t=argt) ANDF execbrk==0 | |
37 | THEN REG INT treeflgs; | |
38 | INT oldexit, type; | |
39 | REG STRING *com; | |
40 | ||
41 | treeflgs = t->tretyp; type = treeflgs&COMMSK; | |
42 | oldexit=exitval; exitval=0; | |
43 | ||
44 | SWITCH type IN | |
45 | ||
46 | case TCOM: | |
47 | BEGIN | |
48 | STRING a1; | |
49 | INT argn, internal; | |
50 | ARGPTR schain=gchain; | |
51 | IOPTR io=t->treio; | |
52 | gchain=0; | |
53 | argn = getarg(t); | |
54 | com=scan(argn); | |
55 | a1=com[1]; gchain=schain; | |
56 | ||
eb594574 | 57 | IF argn==0 ORF (internal=syslook(com[0],commands)) |
f8e636e7 KM |
58 | THEN setlist(t->comset, 0); |
59 | FI | |
60 | ||
61 | IF argn ANDF (flags&noexec)==0 | |
62 | THEN /* print command if execpr */ | |
63 | IF flags&execpr | |
64 | THEN argn=0; prs(execpmsg); | |
65 | WHILE com[argn]!=ENDARGS | |
66 | DO prs(com[argn++]); blank() OD | |
67 | newline(); | |
68 | FI | |
69 | ||
70 | SWITCH internal IN | |
71 | ||
72 | case SYSDOT: | |
73 | IF a1 | |
74 | THEN REG INT f; | |
75 | ||
76 | IF (f=pathopen(getpath(a1), a1)) < 0 | |
77 | THEN failed(a1,notfound); | |
78 | ELSE execexp(0,f); | |
79 | FI | |
80 | FI | |
81 | break; | |
82 | ||
83 | case SYSTIMES: | |
84 | { | |
85 | L_INT t[4]; times(t); | |
86 | prt(t[2]); blank(); prt(t[3]); newline(); | |
87 | } | |
88 | break; | |
89 | ||
90 | case SYSEXIT: | |
91 | exitsh(a1?stoi(a1):oldexit); | |
92 | ||
93 | case SYSNULL: | |
94 | io=0; | |
95 | break; | |
96 | ||
97 | case SYSCONT: | |
98 | execbrk = -loopcnt; break; | |
99 | ||
100 | case SYSBREAK: | |
101 | IF (execbrk=loopcnt) ANDF a1 | |
102 | THEN breakcnt=stoi(a1); | |
103 | FI | |
104 | break; | |
105 | ||
106 | case SYSTRAP: | |
107 | IF a1 | |
108 | THEN BOOL clear; | |
109 | IF (clear=digit(*a1))==0 | |
110 | THEN ++com; | |
111 | FI | |
112 | WHILE *++com | |
113 | DO INT i; | |
114 | IF (i=stoi(*com))>=MAXTRAP ORF i<MINTRAP | |
115 | THEN failed(*com,badtrap); | |
116 | ELIF clear | |
117 | THEN clrsig(i); | |
118 | ELSE replace(&trapcom[i],a1); | |
119 | IF *a1 | |
120 | THEN getsig(i); | |
121 | ELSE ignsig(i); | |
122 | FI | |
123 | FI | |
124 | OD | |
125 | ELSE /* print out current traps */ | |
126 | INT i; | |
127 | ||
128 | FOR i=0; i<MAXTRAP; i++ | |
129 | DO IF trapcom[i] | |
130 | THEN prn(i); prs(colon); prs(trapcom[i]); newline(); | |
131 | FI | |
132 | OD | |
133 | FI | |
134 | break; | |
135 | ||
136 | case SYSEXEC: | |
137 | com++; | |
138 | initio(io); ioset=0; io=0; | |
139 | IF a1==0 THEN break FI | |
140 | ||
141 | case SYSLOGIN: | |
142 | flags |= forked; | |
143 | oldsigs(); execa(com); done(); | |
144 | ||
145 | case SYSCD: | |
146 | IF flags&rshflg | |
147 | THEN failed(com[0],restricted); | |
148 | ELIF (a1==0 ANDF (a1=homenod.namval)==0) ORF chdir(a1)<0 | |
149 | THEN failed(a1,baddir); | |
150 | FI | |
151 | break; | |
152 | ||
153 | case SYSSHFT: | |
154 | IF dolc<1 | |
155 | THEN error(badshift); | |
156 | ELSE dolv++; dolc--; | |
157 | FI | |
158 | assnum(&dolladr, dolc); | |
159 | break; | |
160 | ||
161 | case SYSWAIT: | |
162 | await(-1); | |
163 | break; | |
164 | ||
165 | case SYSREAD: | |
166 | exitval=readvar(&com[1]); | |
167 | break; | |
168 | ||
169 | /* | |
170 | case SYSTST: | |
171 | exitval=testcmd(com); | |
172 | break; | |
173 | */ | |
174 | ||
175 | case SYSSET: | |
176 | IF a1 | |
177 | THEN INT argc; | |
178 | argc = options(argn,com); | |
179 | IF argc>1 | |
180 | THEN setargs(com+argn-argc); | |
181 | FI | |
182 | ELIF t->comset==0 | |
183 | THEN /*scan name chain and print*/ | |
184 | namscan(printnam); | |
185 | FI | |
186 | break; | |
187 | ||
188 | case SYSRDONLY: | |
189 | exitval=N_RDONLY; | |
190 | case SYSXPORT: | |
191 | IF exitval==0 THEN exitval=N_EXPORT; FI | |
192 | ||
193 | IF a1 | |
194 | THEN WHILE *++com | |
195 | DO attrib(lookup(*com), exitval) OD | |
196 | ELSE namscan(printflg); | |
197 | FI | |
198 | exitval=0; | |
199 | break; | |
200 | ||
201 | case SYSEVAL: | |
202 | IF a1 | |
203 | THEN execexp(a1,&com[2]); | |
204 | FI | |
205 | break; | |
206 | ||
207 | case SYSUMASK: | |
208 | if (a1) { | |
399372bb | 209 | int c, i; |
f8e636e7 KM |
210 | i = 0; |
211 | while ((c = *a1++) >= '0' && | |
212 | c <= '7') | |
213 | i = (i << 3) + c - '0'; | |
214 | umask(i); | |
215 | } else { | |
216 | int i, j; | |
217 | umask(i = umask(0)); | |
218 | prc('0'); | |
219 | for (j = 6; j >= 0; j -= 3) | |
220 | prc(((i>>j)&07) + '0'); | |
221 | newline(); | |
222 | } | |
223 | break; | |
224 | ||
225 | default: | |
226 | internal=builtin(argn,com); | |
227 | ||
228 | ENDSW | |
229 | ||
230 | IF internal | |
231 | THEN IF io THEN error(illegal) FI | |
232 | chktrap(); | |
233 | break; | |
234 | FI | |
235 | ELIF t->treio==0 | |
236 | THEN break; | |
237 | FI | |
238 | END | |
239 | ||
240 | case TFORK: | |
241 | IF execflg ANDF (treeflgs&(FAMP|FPOU))==0 | |
242 | THEN parent=0; | |
243 | ELSE WHILE (parent=fork()) == -1 | |
244 | DO sigchk(); alarm(10); pause() OD | |
245 | FI | |
246 | ||
247 | IF parent | |
248 | THEN /* This is the parent branch of fork; */ | |
249 | /* it may or may not wait for the child. */ | |
250 | IF treeflgs&FPRS ANDF flags&ttyflg | |
251 | THEN prn(parent); newline(); | |
252 | FI | |
253 | IF treeflgs&FPCL THEN closepipe(pf1) FI | |
254 | IF (treeflgs&(FAMP|FPOU))==0 | |
255 | THEN await(parent); | |
256 | ELIF (treeflgs&FAMP)==0 | |
257 | THEN post(parent); | |
258 | ELSE assnum(&pcsadr, parent); | |
259 | FI | |
260 | ||
261 | chktrap(); | |
262 | break; | |
263 | ||
264 | ||
265 | ELSE /* this is the forked branch (child) of execute */ | |
266 | flags |= forked; iotemp=0; | |
267 | postclr(); | |
268 | settmp(); | |
269 | ||
270 | /* Turn off INTR and QUIT if `FINT' */ | |
271 | /* Reset ramaining signals to parent */ | |
272 | /* except for those `lost' by trap */ | |
273 | oldsigs(); | |
274 | IF treeflgs&FINT | |
275 | THEN signal(INTR,1); signal(QUIT,1); | |
276 | FI | |
277 | ||
278 | /* pipe in or out */ | |
279 | IF treeflgs&FPIN | |
280 | THEN rename(pf1[INPIPE],0); | |
281 | close(pf1[OTPIPE]); | |
282 | FI | |
283 | IF treeflgs&FPOU | |
284 | THEN rename(pf2[OTPIPE],1); | |
285 | close(pf2[INPIPE]); | |
286 | FI | |
287 | ||
288 | /* default std input for & */ | |
289 | IF treeflgs&FINT ANDF ioset==0 | |
290 | THEN rename(chkopen(devnull),0); | |
291 | FI | |
292 | ||
293 | /* io redirection */ | |
294 | initio(t->treio); | |
295 | IF type!=TCOM | |
296 | THEN execute(t->forktre,1); | |
297 | ELIF com[0]!=ENDARGS | |
298 | THEN setlist(t->comset,N_EXPORT); | |
299 | execa(com); | |
300 | FI | |
301 | done(); | |
302 | FI | |
303 | ||
304 | case TPAR: | |
305 | rename(dup(2),output); | |
306 | execute(t->partre,execflg); | |
307 | done(); | |
308 | ||
309 | case TFIL: | |
310 | BEGIN | |
311 | INT pv[2]; chkpipe(pv); | |
312 | IF execute(t->lstlef, 0, pf1, pv)==0 | |
313 | THEN execute(t->lstrit, execflg, pv, pf2); | |
314 | ELSE closepipe(pv); | |
315 | FI | |
316 | END | |
317 | break; | |
318 | ||
319 | case TLST: | |
320 | execute(t->lstlef,0); | |
321 | execute(t->lstrit,execflg); | |
322 | break; | |
323 | ||
324 | case TAND: | |
325 | IF execute(t->lstlef,0)==0 | |
326 | THEN execute(t->lstrit,execflg); | |
327 | FI | |
328 | break; | |
329 | ||
330 | case TORF: | |
331 | IF execute(t->lstlef,0)!=0 | |
332 | THEN execute(t->lstrit,execflg); | |
333 | FI | |
334 | break; | |
335 | ||
336 | case TFOR: | |
337 | BEGIN | |
338 | NAMPTR n = lookup(t->fornam); | |
339 | STRING *args; | |
340 | DOLPTR argsav=0; | |
341 | ||
342 | IF t->forlst==0 | |
343 | THEN args=dolv+1; | |
344 | argsav=useargs(); | |
345 | ELSE ARGPTR schain=gchain; | |
346 | gchain=0; | |
347 | trim((args=scan(getarg(t->forlst)))[0]); | |
348 | gchain=schain; | |
349 | FI | |
350 | loopcnt++; | |
351 | WHILE *args!=ENDARGS ANDF execbrk==0 | |
352 | DO assign(n,*args++); | |
353 | execute(t->fortre,0); | |
354 | IF execbrk<0 THEN execbrk=0 FI | |
355 | OD | |
356 | IF breakcnt THEN breakcnt-- FI | |
357 | execbrk=breakcnt; loopcnt--; | |
358 | argfor=freeargs(argsav); | |
359 | END | |
360 | break; | |
361 | ||
362 | case TWH: | |
363 | case TUN: | |
364 | BEGIN | |
365 | INT i=0; | |
366 | ||
367 | loopcnt++; | |
368 | WHILE execbrk==0 ANDF (execute(t->whtre,0)==0)==(type==TWH) | |
369 | DO i=execute(t->dotre,0); | |
370 | IF execbrk<0 THEN execbrk=0 FI | |
371 | OD | |
372 | IF breakcnt THEN breakcnt-- FI | |
373 | execbrk=breakcnt; loopcnt--; exitval=i; | |
374 | END | |
375 | break; | |
376 | ||
377 | case TIF: | |
378 | IF execute(t->iftre,0)==0 | |
379 | THEN execute(t->thtre,execflg); | |
380 | ELSE execute(t->eltre,execflg); | |
381 | FI | |
382 | break; | |
383 | ||
384 | case TSW: | |
385 | BEGIN | |
386 | REG STRING r = mactrim(t->swarg); | |
387 | t=t->swlst; | |
388 | WHILE t | |
389 | DO ARGPTR rex=t->regptr; | |
390 | WHILE rex | |
391 | DO REG STRING s; | |
392 | IF gmatch(r,s=macro(rex->argval)) ORF (trim(s), eq(r,s)) | |
393 | THEN execute(t->regcom,0); | |
394 | t=0; break; | |
395 | ELSE rex=rex->argnxt; | |
396 | FI | |
397 | OD | |
398 | IF t THEN t=t->regnxt FI | |
399 | OD | |
400 | END | |
401 | break; | |
402 | ENDSW | |
403 | exitset(); | |
404 | FI | |
405 | ||
406 | sigchk(); | |
407 | tdystak(sav); | |
408 | return(exitval); | |
409 | } | |
410 | ||
411 | ||
412 | execexp(s,f) | |
413 | STRING s; | |
414 | UFD f; | |
415 | { | |
416 | FILEBLK fb; | |
417 | push(&fb); | |
418 | IF s | |
419 | THEN estabf(s); fb.feval=f; | |
420 | ELIF f>=0 | |
421 | THEN initf(f); | |
422 | FI | |
423 | execute(cmd(NL, NLFLG|MTFLG),0); | |
424 | pop(); | |
425 | } |