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536150a4 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
3 | /* static char sccsid[] = "@(#)library.c 1.1 9/2/82"; */ | |
4 | ||
5 | /* | |
6 | * General purpose routines. | |
7 | */ | |
8 | ||
9 | #include <stdio.h> | |
10 | #include <errno.h> | |
11 | #include <signal.h> | |
12 | ||
13 | #define public | |
14 | #define private static | |
15 | #define and && | |
16 | #define or || | |
17 | #define not ! | |
18 | #define ord(enumcon) ((int) enumcon) | |
19 | #define nil(type) ((type) 0) | |
20 | ||
21 | typedef enum { FALSE, TRUE } Boolean; | |
22 | typedef char *String; | |
23 | typedef FILE *File; | |
24 | typedef String Filename; | |
25 | ||
26 | #undef FILE | |
27 | ||
28 | /* | |
29 | * Definitions of standard C library routines that aren't in the | |
30 | * standard I/O library, but which are generally useful. | |
31 | */ | |
32 | ||
33 | extern long atol(); /* ascii to long */ | |
34 | extern double atof(); /* ascii to floating point */ | |
35 | extern char *mktemp(); /* make a temporary file name */ | |
36 | ||
37 | String cmdname; /* name of command for error messages */ | |
38 | Filename errfilename; /* current file associated with error */ | |
39 | short errlineno; /* line number associated with error */ | |
40 | ||
41 | /* | |
42 | * Definitions for doing memory allocation. | |
43 | */ | |
44 | ||
45 | extern char *malloc(); | |
46 | ||
47 | #define alloc(n, type) ((type *) malloc((unsigned) (n) * sizeof(type))) | |
48 | #define dispose(p) { free((char *) p); p = 0; } | |
49 | ||
50 | /* | |
51 | * Macros for doing freads + fwrites. | |
52 | */ | |
53 | ||
54 | #define get(fp, var) fread((char *) &(var), sizeof(var), 1, fp) | |
55 | #define put(fp, var) fwrite((char *) &(var), sizeof(var), 1, fp) | |
56 | ||
57 | /* | |
58 | * String definitions. | |
59 | */ | |
60 | ||
61 | extern String strcpy(), index(), rindex(); | |
62 | extern int strlen(); | |
63 | ||
64 | #define strdup(s) strcpy(malloc((unsigned) strlen(s) + 1), s) | |
65 | #define streq(s1, s2) (strcmp(s1, s2) == 0) | |
66 | ||
67 | typedef int INTFUNC(); | |
68 | ||
69 | typedef struct { | |
70 | INTFUNC *func; | |
71 | } ERRINFO; | |
72 | ||
73 | #define ERR_IGNORE ((INTFUNC *) 0) | |
74 | #define ERR_CATCH ((INTFUNC *) 1) | |
75 | ||
76 | /* | |
77 | * Call a program. | |
78 | * | |
79 | * Four entries: | |
80 | * | |
81 | * call, callv - call a program and wait for it, returning status | |
82 | * back, backv - call a program and don't wait, returning process id | |
83 | * | |
84 | * The command's standard input and output are passed as FILE's. | |
85 | */ | |
86 | ||
87 | ||
88 | #define MAXNARGS 100 /* unchecked upper limit on max num of arguments */ | |
89 | #define BADEXEC 127 /* exec fails */ | |
90 | ||
91 | #define ischild(pid) ((pid) == 0) | |
92 | ||
93 | /* VARARGS3 */ | |
94 | public int call(name, in, out, args) | |
95 | String name; | |
96 | File in; | |
97 | File out; | |
98 | String args; | |
99 | { | |
100 | String *ap, *argp; | |
101 | String argv[MAXNARGS]; | |
102 | ||
103 | argp = &argv[0]; | |
104 | *argp++ = name; | |
105 | ap = &args; | |
106 | while (*ap != nil(String)) { | |
107 | *argp++ = *ap++; | |
108 | } | |
109 | *argp = nil(String); | |
110 | return callv(name, in, out, argv); | |
111 | } | |
112 | ||
113 | /* VARARGS3 */ | |
114 | public int back(name, in, out, args) | |
115 | String name; | |
116 | File in; | |
117 | File out; | |
118 | String args; | |
119 | { | |
120 | String *ap, *argp; | |
121 | String argv[MAXNARGS]; | |
122 | ||
123 | argp = &argv[0]; | |
124 | *argp++ = name; | |
125 | ap = &args; | |
126 | while (*ap != nil(String)) { | |
127 | *argp++ = *ap++; | |
128 | } | |
129 | *argp = nil(String); | |
130 | return backv(name, in, out, argv); | |
131 | } | |
132 | ||
133 | public int callv(name, in, out, argv) | |
134 | String name; | |
135 | File in; | |
136 | File out; | |
137 | String *argv; | |
138 | { | |
139 | int pid, status; | |
140 | ||
141 | pid = backv(name, in, out, argv); | |
142 | pwait(pid, &status); | |
143 | return status; | |
144 | } | |
145 | ||
146 | public int backv(name, in, out, argv) | |
147 | String name; | |
148 | File in; | |
149 | File out; | |
150 | String *argv; | |
151 | { | |
152 | int pid; | |
153 | ||
154 | fflush(stdout); | |
155 | if (ischild(pid = fork())) { | |
156 | fswap(0, fileno(in)); | |
157 | fswap(1, fileno(out)); | |
158 | onsyserr(EACCES, ERR_IGNORE); | |
159 | execvp(name, argv); | |
160 | _exit(BADEXEC); | |
161 | } | |
162 | return pid; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Swap file numbers so as to redirect standard input and output. | |
167 | */ | |
168 | ||
169 | private fswap(oldfd, newfd) | |
170 | int oldfd; | |
171 | int newfd; | |
172 | { | |
173 | if (oldfd != newfd) { | |
174 | close(oldfd); | |
175 | dup(newfd); | |
176 | close(newfd); | |
177 | } | |
178 | } | |
179 | ||
180 | /* | |
181 | * Invoke a shell on a command line. | |
182 | */ | |
183 | ||
184 | #define DEF_SHELL "csh" | |
185 | ||
186 | public shell(s) | |
187 | String s; | |
188 | { | |
189 | extern String getenv(); | |
190 | String sh; | |
191 | ||
192 | if ((sh = getenv("SHELL")) == nil(String)) { | |
193 | sh = DEF_SHELL; | |
194 | } | |
195 | if (s != nil(String) and *s != '\0') { | |
196 | call(sh, stdin, stdout, "-c", s, 0); | |
197 | } else { | |
198 | call(sh, stdin, stdout, 0); | |
199 | } | |
200 | } | |
201 | ||
202 | /* | |
203 | * Wait for a process the right way. We wait for a particular | |
204 | * process and if any others come along in between, we remember them | |
205 | * in case they are eventually waited for. | |
206 | * | |
207 | * This routine is not very efficient when the number of processes | |
208 | * to be remembered is large. | |
209 | */ | |
210 | ||
211 | typedef struct pidlist { | |
212 | int pid; | |
213 | int status; | |
214 | struct pidlist *next; | |
215 | } Pidlist; | |
216 | ||
217 | private Pidlist *pidlist, *pfind(); | |
218 | ||
219 | public pwait(pid, statusp) | |
220 | int pid, *statusp; | |
221 | { | |
222 | Pidlist *p; | |
223 | int pnum, status; | |
224 | ||
225 | p = pfind(pid); | |
226 | if (p != nil(Pidlist *)) { | |
227 | *statusp = p->status; | |
228 | dispose(p); | |
229 | return; | |
230 | } | |
231 | while ((pnum = wait(&status)) != pid && pnum >= 0) { | |
232 | p = alloc(1, Pidlist); | |
233 | p->pid = pnum; | |
234 | p->status = status; | |
235 | p->next = pidlist; | |
236 | pidlist = p; | |
237 | } | |
238 | if (pnum < 0) { | |
239 | p = pfind(pid); | |
240 | if (p == nil(Pidlist *)) { | |
241 | panic("pwait: pid %d not found", pid); | |
242 | } | |
243 | *statusp = p->status; | |
244 | dispose(p); | |
245 | } else { | |
246 | *statusp = status; | |
247 | } | |
248 | } | |
249 | ||
250 | /* | |
251 | * Look for the given process id on the pidlist. | |
252 | * | |
253 | * Unlink it from list if found. | |
254 | */ | |
255 | ||
256 | private Pidlist *pfind(pid) | |
257 | int pid; | |
258 | { | |
259 | register Pidlist *p, *prev; | |
260 | ||
261 | prev = nil(Pidlist *); | |
262 | for (p = pidlist; p != nil(Pidlist *); p = p->next) { | |
263 | if (p->pid == pid) { | |
264 | break; | |
265 | } | |
266 | prev = p; | |
267 | } | |
268 | if (p != nil(Pidlist *)) { | |
269 | if (prev == nil(Pidlist *)) { | |
270 | pidlist = p->next; | |
271 | } else { | |
272 | prev->next = p->next; | |
273 | } | |
274 | } | |
275 | return p; | |
276 | } | |
277 | ||
278 | /* | |
279 | * System call error handler. | |
280 | * | |
281 | * The syserr routine is called when a system call is about to | |
282 | * set the c-bit to report an error. Certain errors are caught | |
283 | * and cause the process to print a message and immediately exit. | |
284 | */ | |
285 | ||
286 | extern int sys_nerr; | |
287 | extern char *sys_errlist[]; | |
288 | ||
289 | /* | |
290 | * Before calling syserr, the integer errno is set to contain the | |
291 | * number of the error. The routine "_mycerror" is a dummy which | |
292 | * is used to force the loader to get my version of cerror rather | |
293 | * than the usual one. | |
294 | */ | |
295 | ||
296 | extern int errno; | |
297 | extern _mycerror(); | |
298 | ||
299 | /* | |
300 | * Default error handling. | |
301 | */ | |
302 | ||
303 | private ERRINFO errinfo[] ={ | |
304 | /* no error */ ERR_IGNORE, | |
305 | /* EPERM */ ERR_IGNORE, | |
306 | /* ENOENT */ ERR_IGNORE, | |
307 | /* ESRCH */ ERR_IGNORE, | |
308 | /* EINTR */ ERR_CATCH, | |
309 | /* EIO */ ERR_CATCH, | |
310 | /* ENXIO */ ERR_CATCH, | |
311 | /* E2BIG */ ERR_CATCH, | |
312 | /* ENOEXEC */ ERR_CATCH, | |
313 | /* EBADF */ ERR_IGNORE, | |
314 | /* ECHILD */ ERR_CATCH, | |
315 | /* EAGAIN */ ERR_CATCH, | |
316 | /* ENOMEM */ ERR_CATCH, | |
317 | /* EACCES */ ERR_CATCH, | |
318 | /* EFAULT */ ERR_CATCH, | |
319 | /* ENOTBLK */ ERR_CATCH, | |
320 | /* EBUSY */ ERR_CATCH, | |
321 | /* EEXIST */ ERR_CATCH, | |
322 | /* EXDEV */ ERR_CATCH, | |
323 | /* ENODEV */ ERR_CATCH, | |
324 | /* ENOTDIR */ ERR_CATCH, | |
325 | /* EISDIR */ ERR_CATCH, | |
326 | /* EINVAL */ ERR_CATCH, | |
327 | /* ENFILE */ ERR_CATCH, | |
328 | /* EMFILE */ ERR_CATCH, | |
329 | /* ENOTTY */ ERR_IGNORE, | |
330 | /* ETXTBSY */ ERR_CATCH, | |
331 | /* EFBIG */ ERR_CATCH, | |
332 | /* ENOSPC */ ERR_CATCH, | |
333 | /* ESPIPE */ ERR_CATCH, | |
334 | /* EROFS */ ERR_CATCH, | |
335 | /* EMLINK */ ERR_CATCH, | |
336 | /* EPIPE */ ERR_CATCH, | |
337 | /* EDOM */ ERR_CATCH, | |
338 | /* ERANGE */ ERR_CATCH, | |
339 | /* EQUOT */ ERR_CATCH, | |
340 | }; | |
341 | ||
342 | public syserr() | |
343 | { | |
344 | ERRINFO *e; | |
345 | ||
346 | e = &errinfo[errno]; | |
347 | if (e->func == ERR_CATCH) { | |
348 | if (errno < sys_nerr) { | |
349 | fatal(sys_errlist[errno]); | |
350 | } else { | |
351 | fatal("errno %d", errno); | |
352 | } | |
353 | } else if (e->func != ERR_IGNORE) { | |
354 | (*e->func)(); | |
355 | } | |
356 | } | |
357 | ||
358 | /* | |
359 | * Catcherrs only purpose is to get this module loaded and make | |
360 | * sure my cerror is loaded (only applicable when this is in a library). | |
361 | */ | |
362 | ||
363 | public catcherrs() | |
364 | { | |
365 | _mycerror(); | |
366 | } | |
367 | ||
368 | /* | |
369 | * Change the action on receipt of an error. | |
370 | */ | |
371 | ||
372 | public onsyserr(n, f) | |
373 | int n; | |
374 | INTFUNC *f; | |
375 | { | |
376 | errinfo[n].func = f; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Print the message associated with the given signal. | |
381 | * Like a "perror" for signals. | |
382 | */ | |
383 | ||
384 | public int sys_nsig = NSIG; | |
385 | public String sys_siglist[] = { | |
386 | "no signal", | |
387 | "hangup", | |
388 | "interrupt", | |
389 | "quit", | |
390 | "illegal instruction", | |
391 | "trace trap", | |
392 | "IOT instruction", | |
393 | "EMT instruction", | |
394 | "floating point exception", | |
395 | "kill", | |
396 | "bus error", | |
397 | "segmentation violation", | |
398 | "bad argument to system call", | |
399 | "broken pipe", | |
400 | "alarm clock", | |
401 | "soft kill", | |
402 | "urgent I/O condition", | |
403 | "stop signal not from tty", | |
404 | "stop signal from tty", | |
405 | "continue", | |
406 | "child termination", | |
407 | "stop (tty input)", | |
408 | "stop (tty output)", | |
409 | "possible input/output", | |
410 | "exceeded CPU time limit", | |
411 | "exceeded file size limit", | |
412 | nil(String) | |
413 | }; | |
414 | ||
415 | public psig(s) | |
416 | String s; | |
417 | { | |
418 | String c; | |
419 | int n; | |
420 | ||
421 | c = "Unknown signal"; | |
422 | if (errno < sys_nsig) { | |
423 | c = sys_errlist[errno]; | |
424 | } | |
425 | n = strlen(s); | |
426 | if (n > 0) { | |
427 | write(2, s, n); | |
428 | write(2, ": ", 2); | |
429 | } | |
430 | write(2, c, strlen(c)); | |
431 | write(2, "\n", 1); | |
432 | } | |
433 | ||
434 | /* | |
435 | * Standard error handling routines. | |
436 | */ | |
437 | ||
438 | private short nerrs; | |
439 | private short nwarnings; | |
440 | ||
441 | /* | |
442 | * Main driver of error message reporting. | |
443 | */ | |
444 | ||
445 | /* VARARGS2 */ | |
446 | private errmsg(errname, shouldquit, s, a, b, c, d, e, f, g, h, i, j, k, l, m) | |
447 | String errname; | |
448 | Boolean shouldquit; | |
449 | String s; | |
450 | { | |
451 | fflush(stdout); | |
452 | if (shouldquit and cmdname != nil(String)) { | |
453 | fprintf(stderr, "%s: ", cmdname); | |
454 | } | |
455 | if (errfilename != nil(Filename)) { | |
456 | fprintf(stderr, "%s: ", errfilename); | |
457 | } | |
458 | if (errlineno > 0) { | |
459 | fprintf(stderr, "%d: ", errlineno); | |
460 | } | |
461 | if (errname != nil(String)) { | |
462 | fprintf(stderr, "%s: ", errname); | |
463 | } | |
464 | fprintf(stderr, s, a, b, c, d, e, f, g, h, i, j, k, l, m); | |
465 | putc('\n', stderr); | |
466 | if (shouldquit) { | |
467 | quit(1); | |
468 | } | |
469 | } | |
470 | ||
471 | /* | |
472 | * For when printf isn't sufficient for printing the error message ... | |
473 | */ | |
474 | ||
475 | public beginerrmsg() | |
476 | { | |
477 | fflush(stdout); | |
478 | if (errfilename != nil(String)) { | |
479 | fprintf(stderr, "%s: ", errfilename); | |
480 | } | |
481 | if (errlineno > 0) { | |
482 | fprintf(stderr, "%d: ", errlineno); | |
483 | } | |
484 | } | |
485 | ||
486 | public enderrmsg() | |
487 | { | |
488 | putc('\n', stderr); | |
489 | erecover(); | |
490 | } | |
491 | ||
492 | /* | |
493 | * The messages are listed in increasing order of seriousness. | |
494 | * | |
495 | * First are warnings. | |
496 | */ | |
497 | ||
498 | /* VARARGS1 */ | |
499 | public warning(s, a, b, c, d, e, f, g, h, i, j, k, l, m) | |
500 | String s; | |
501 | { | |
502 | nwarnings++; | |
503 | errmsg("warning", FALSE, s, a, b, c, d, e, f, g, h, i, j, k, l, m); | |
504 | } | |
505 | ||
506 | /* | |
507 | * Errors are a little worse, they mean something is wrong, | |
508 | * but not so bad that processing can't continue. | |
509 | * | |
510 | * The routine "erecover" is called to recover from the error, | |
511 | * a default routine is provided that does nothing. | |
512 | */ | |
513 | ||
514 | /* VARARGS1 */ | |
515 | public error(s, a, b, c, d, e, f, g, h, i, j, k, l, m) | |
516 | String s; | |
517 | { | |
518 | extern erecover(); | |
519 | ||
520 | nerrs++; | |
521 | errmsg(nil(String), FALSE, s, a, b, c, d, e, f, g, h, i, j, k, l, m); | |
522 | erecover(); | |
523 | } | |
524 | ||
525 | /* | |
526 | * Non-recoverable user error. | |
527 | */ | |
528 | ||
529 | /* VARARGS1 */ | |
530 | public fatal(s, a, b, c, d, e, f, g, h, i, j, k, l, m) | |
531 | String s; | |
532 | { | |
533 | errmsg("fatal error", TRUE, s, a, b, c, d, e, f, g, h, i, j, k, l, m); | |
534 | } | |
535 | ||
536 | /* | |
537 | * Panics indicate an internal program error. | |
538 | */ | |
539 | ||
540 | /* VARARGS1 */ | |
541 | public panic(s, a, b, c, d, e, f, g, h, i, j, k, l, m) | |
542 | String s; | |
543 | { | |
544 | errmsg("internal error", TRUE, s, a, b, c, d, e, f, g, h, i, j, k, l, m); | |
545 | } | |
546 | ||
547 | short numerrors() | |
548 | { | |
549 | short r; | |
550 | ||
551 | r = nerrs; | |
552 | nerrs = 0; | |
553 | return r; | |
554 | } | |
555 | ||
556 | short numwarnings() | |
557 | { | |
558 | short r; | |
559 | ||
560 | r = nwarnings; | |
561 | nwarnings = 0; | |
562 | return r; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Recover from an error. | |
567 | * | |
568 | * This is the default routine which we aren't using since we have our own. | |
569 | * | |
570 | public erecover() | |
571 | { | |
572 | } | |
573 | * | |
574 | */ | |
575 | ||
576 | /* | |
577 | * Default way to quit from a program is just to exit. | |
578 | * | |
579 | public quit(r) | |
580 | int r; | |
581 | { | |
582 | exit(r); | |
583 | } | |
584 | * | |
585 | */ | |
586 | ||
587 | /* | |
588 | * Compare n-byte areas pointed to by s1 and s2 | |
589 | * if n is 0 then compare up until one has a null byte. | |
590 | */ | |
591 | ||
592 | public int cmp(s1, s2, n) | |
593 | register char *s1, *s2; | |
594 | register unsigned int n; | |
595 | { | |
596 | if (s1 == nil(char *) || s2 == nil(char *)) { | |
597 | panic("cmp: nil pointer"); | |
598 | } | |
599 | if (n == 0) { | |
600 | while (*s1 == *s2++) { | |
601 | if (*s1++ == '\0') { | |
602 | return(0); | |
603 | } | |
604 | } | |
605 | return(*s1 - *(s2-1)); | |
606 | } else { | |
607 | for (; n != 0; n--) { | |
608 | if (*s1++ != *s2++) { | |
609 | return(*(s1-1) - *(s2-1)); | |
610 | } | |
611 | } | |
612 | return(0); | |
613 | } | |
614 | } | |
615 | ||
616 | /* | |
617 | * Move n bytes from src to dest. | |
618 | * If n is 0 move until a null is found. | |
619 | */ | |
620 | ||
621 | public mov(src, dest, n) | |
622 | register char *src, *dest; | |
623 | register unsigned int n; | |
624 | { | |
625 | if (src == nil(char *)) | |
626 | panic("mov: nil source"); | |
627 | if (dest == nil(char *)) | |
628 | panic("mov: nil destination"); | |
629 | if (n != 0) { | |
630 | for (; n != 0; n--) { | |
631 | *dest++ = *src++; | |
632 | } | |
633 | } else { | |
634 | while ((*dest++ = *src++) != '\0'); | |
635 | } | |
636 | } |