1 /*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)lex.c 8.2 (Berkeley) 04/20/95";
10 #endif /* not lint */
11
12 #include "rcv.h"
13 #include <errno.h>
14 #include <fcntl.h>
15 #include "extern.h"
16
17 /*
18 * Mail -- a mail program
19 *
20 * Lexical processing of commands.
21 */
22
23 char *prompt = "& ";
24
25 /*
26 * Set up editing on the given file name.
27 * If the first character of name is %, we are considered to be
28 * editing the file, otherwise we are reading our mail which has
29 * signficance for mbox and so forth.
30 */
31 int
setfile(name)32 setfile(name)
33 char *name;
34 {
35 FILE *ibuf;
36 int i;
37 struct stat stb;
38 char isedit = *name != '%';
39 char *who = name[1] ? name + 1 : myname;
40 static int shudclob;
41 extern char tempMesg[];
42 extern int errno;
43
44 if ((name = expand(name)) == NOSTR)
45 return -1;
46
47 if ((ibuf = Fopen(name, "r")) == NULL) {
48 if (!isedit && errno == ENOENT)
49 goto nomail;
50 perror(name);
51 return(-1);
52 }
53
54 if (fstat(fileno(ibuf), &stb) < 0) {
55 perror("fstat");
56 Fclose(ibuf);
57 return (-1);
58 }
59
60 switch (stb.st_mode & S_IFMT) {
61 case S_IFDIR:
62 Fclose(ibuf);
63 errno = EISDIR;
64 perror(name);
65 return (-1);
66
67 case S_IFREG:
68 break;
69
70 default:
71 Fclose(ibuf);
72 errno = EINVAL;
73 perror(name);
74 return (-1);
75 }
76
77 /*
78 * Looks like all will be well. We must now relinquish our
79 * hold on the current set of stuff. Must hold signals
80 * while we are reading the new file, else we will ruin
81 * the message[] data structure.
82 */
83
84 holdsigs();
85 if (shudclob)
86 quit();
87
88 /*
89 * Copy the messages into /tmp
90 * and set pointers.
91 */
92
93 readonly = 0;
94 if ((i = open(name, 1)) < 0)
95 readonly++;
96 else
97 close(i);
98 if (shudclob) {
99 fclose(itf);
100 fclose(otf);
101 }
102 shudclob = 1;
103 edit = isedit;
104 strcpy(prevfile, mailname);
105 if (name != mailname)
106 strcpy(mailname, name);
107 mailsize = fsize(ibuf);
108 if ((otf = fopen(tempMesg, "w")) == NULL) {
109 perror(tempMesg);
110 exit(1);
111 }
112 (void) fcntl(fileno(otf), F_SETFD, 1);
113 if ((itf = fopen(tempMesg, "r")) == NULL) {
114 perror(tempMesg);
115 exit(1);
116 }
117 (void) fcntl(fileno(itf), F_SETFD, 1);
118 rm(tempMesg);
119 setptr(ibuf, 0);
120 setmsize(msgCount);
121 /*
122 * New mail mail have arrived while we were reading
123 * up the mail file, so reset mailsize to be where
124 * we really are in the file...
125 */
126 mailsize = ftell(ibuf);
127 Fclose(ibuf);
128 relsesigs();
129 sawcom = 0;
130 if (!edit && msgCount == 0) {
131 nomail:
132 fprintf(stderr, "No mail for %s\n", who);
133 return -1;
134 }
135 return(0);
136 }
137
138 /*
139 * Incorporate any new mail that has arrived since we first
140 * started reading mail.
141 */
142 int
incfile()143 incfile()
144 {
145 int newsize;
146 int omsgCount = msgCount;
147 FILE *ibuf;
148
149 ibuf = Fopen(mailname, "r");
150 if (ibuf == NULL)
151 return -1;
152 holdsigs();
153 newsize = fsize(ibuf);
154 if (newsize == 0)
155 return -1; /* mail box is now empty??? */
156 if (newsize < mailsize)
157 return -1; /* mail box has shrunk??? */
158 if (newsize == mailsize)
159 return 0; /* no new mail */
160 setptr(ibuf, mailsize);
161 setmsize(msgCount);
162 mailsize = ftell(ibuf);
163 Fclose(ibuf);
164 relsesigs();
165 return(msgCount - omsgCount);
166 }
167
168 int *msgvec;
169 int reset_on_stop; /* do a reset() if stopped */
170
171 /*
172 * Interpret user commands one by one. If standard input is not a tty,
173 * print no prompt.
174 */
175 void
commands()176 commands()
177 {
178 int eofloop = 0;
179 register int n;
180 char linebuf[LINESIZE];
181 void intr(), stop(), hangup();
182
183 if (!sourcing) {
184 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
185 signal(SIGINT, intr);
186 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
187 signal(SIGHUP, hangup);
188 signal(SIGTSTP, stop);
189 signal(SIGTTOU, stop);
190 signal(SIGTTIN, stop);
191 }
192 setexit();
193 for (;;) {
194 /*
195 * Print the prompt, if needed. Clear out
196 * string space, and flush the output.
197 */
198 if (!sourcing && value("interactive") != NOSTR) {
199 if ((value("autoinc") != NOSTR) && (incfile() > 0))
200 printf("New mail has arrived.\n");
201 reset_on_stop = 1;
202 printf(prompt);
203 }
204 fflush(stdout);
205 sreset();
206 /*
207 * Read a line of commands from the current input
208 * and handle end of file specially.
209 */
210 n = 0;
211 for (;;) {
212 if (readline(input, &linebuf[n], LINESIZE - n) < 0) {
213 if (n == 0)
214 n = -1;
215 break;
216 }
217 if ((n = strlen(linebuf)) == 0)
218 break;
219 n--;
220 if (linebuf[n] != '\\')
221 break;
222 linebuf[n++] = ' ';
223 }
224 reset_on_stop = 0;
225 if (n < 0) {
226 /* eof */
227 if (loading)
228 break;
229 if (sourcing) {
230 unstack();
231 continue;
232 }
233 if (value("interactive") != NOSTR &&
234 value("ignoreeof") != NOSTR &&
235 ++eofloop < 25) {
236 printf("Use \"quit\" to quit.\n");
237 continue;
238 }
239 break;
240 }
241 eofloop = 0;
242 if (execute(linebuf, 0))
243 break;
244 }
245 }
246
247 /*
248 * Execute a single command.
249 * Command functions return 0 for success, 1 for error, and -1
250 * for abort. A 1 or -1 aborts a load or source. A -1 aborts
251 * the interactive command loop.
252 * Contxt is non-zero if called while composing mail.
253 */
254 int
execute(linebuf,contxt)255 execute(linebuf, contxt)
256 char linebuf[];
257 int contxt;
258 {
259 char word[LINESIZE];
260 char *arglist[MAXARGC];
261 struct cmd *com;
262 register char *cp, *cp2;
263 register int c;
264 int muvec[2];
265 int e = 1;
266
267 /*
268 * Strip the white space away from the beginning
269 * of the command, then scan out a word, which
270 * consists of anything except digits and white space.
271 *
272 * Handle ! escapes differently to get the correct
273 * lexical conventions.
274 */
275
276 for (cp = linebuf; isspace(*cp); cp++)
277 ;
278 if (*cp == '!') {
279 if (sourcing) {
280 printf("Can't \"!\" while sourcing\n");
281 goto out;
282 }
283 shell(cp+1);
284 return(0);
285 }
286 cp2 = word;
287 while (*cp && index(" \t0123456789$^.:/-+*'\"", *cp) == NOSTR)
288 *cp2++ = *cp++;
289 *cp2 = '\0';
290
291 /*
292 * Look up the command; if not found, bitch.
293 * Normally, a blank command would map to the
294 * first command in the table; while sourcing,
295 * however, we ignore blank lines to eliminate
296 * confusion.
297 */
298
299 if (sourcing && *word == '\0')
300 return(0);
301 com = lex(word);
302 if (com == NONE) {
303 printf("Unknown command: \"%s\"\n", word);
304 goto out;
305 }
306
307 /*
308 * See if we should execute the command -- if a conditional
309 * we always execute it, otherwise, check the state of cond.
310 */
311
312 if ((com->c_argtype & F) == 0)
313 if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode)
314 return(0);
315
316 /*
317 * Process the arguments to the command, depending
318 * on the type he expects. Default to an error.
319 * If we are sourcing an interactive command, it's
320 * an error.
321 */
322
323 if (!rcvmode && (com->c_argtype & M) == 0) {
324 printf("May not execute \"%s\" while sending\n",
325 com->c_name);
326 goto out;
327 }
328 if (sourcing && com->c_argtype & I) {
329 printf("May not execute \"%s\" while sourcing\n",
330 com->c_name);
331 goto out;
332 }
333 if (readonly && com->c_argtype & W) {
334 printf("May not execute \"%s\" -- message file is read only\n",
335 com->c_name);
336 goto out;
337 }
338 if (contxt && com->c_argtype & R) {
339 printf("Cannot recursively invoke \"%s\"\n", com->c_name);
340 goto out;
341 }
342 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
343 case MSGLIST:
344 /*
345 * A message list defaulting to nearest forward
346 * legal message.
347 */
348 if (msgvec == 0) {
349 printf("Illegal use of \"message list\"\n");
350 break;
351 }
352 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
353 break;
354 if (c == 0) {
355 *msgvec = first(com->c_msgflag,
356 com->c_msgmask);
357 msgvec[1] = NULL;
358 }
359 if (*msgvec == NULL) {
360 printf("No applicable messages\n");
361 break;
362 }
363 e = (*com->c_func)(msgvec);
364 break;
365
366 case NDMLIST:
367 /*
368 * A message list with no defaults, but no error
369 * if none exist.
370 */
371 if (msgvec == 0) {
372 printf("Illegal use of \"message list\"\n");
373 break;
374 }
375 if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
376 break;
377 e = (*com->c_func)(msgvec);
378 break;
379
380 case STRLIST:
381 /*
382 * Just the straight string, with
383 * leading blanks removed.
384 */
385 while (isspace(*cp))
386 cp++;
387 e = (*com->c_func)(cp);
388 break;
389
390 case RAWLIST:
391 /*
392 * A vector of strings, in shell style.
393 */
394 if ((c = getrawlist(cp, arglist,
395 sizeof arglist / sizeof *arglist)) < 0)
396 break;
397 if (c < com->c_minargs) {
398 printf("%s requires at least %d arg(s)\n",
399 com->c_name, com->c_minargs);
400 break;
401 }
402 if (c > com->c_maxargs) {
403 printf("%s takes no more than %d arg(s)\n",
404 com->c_name, com->c_maxargs);
405 break;
406 }
407 e = (*com->c_func)(arglist);
408 break;
409
410 case NOLIST:
411 /*
412 * Just the constant zero, for exiting,
413 * eg.
414 */
415 e = (*com->c_func)(0);
416 break;
417
418 default:
419 panic("Unknown argtype");
420 }
421
422 out:
423 /*
424 * Exit the current source file on
425 * error.
426 */
427 if (e) {
428 if (e < 0)
429 return 1;
430 if (loading)
431 return 1;
432 if (sourcing)
433 unstack();
434 return 0;
435 }
436 if (value("autoprint") != NOSTR && com->c_argtype & P)
437 if ((dot->m_flag & MDELETED) == 0) {
438 muvec[0] = dot - &message[0] + 1;
439 muvec[1] = 0;
440 type(muvec);
441 }
442 if (!sourcing && (com->c_argtype & T) == 0)
443 sawcom = 1;
444 return(0);
445 }
446
447 /*
448 * Set the size of the message vector used to construct argument
449 * lists to message list functions.
450 */
451 void
setmsize(sz)452 setmsize(sz)
453 int sz;
454 {
455
456 if (msgvec != 0)
457 free((char *) msgvec);
458 msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec);
459 }
460
461 /*
462 * Find the correct command in the command table corresponding
463 * to the passed command "word"
464 */
465
466 struct cmd *
lex(word)467 lex(word)
468 char word[];
469 {
470 register struct cmd *cp;
471 extern struct cmd cmdtab[];
472
473 for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++)
474 if (isprefix(word, cp->c_name))
475 return(cp);
476 return(NONE);
477 }
478
479 /*
480 * Determine if as1 is a valid prefix of as2.
481 * Return true if yep.
482 */
483 int
isprefix(as1,as2)484 isprefix(as1, as2)
485 char *as1, *as2;
486 {
487 register char *s1, *s2;
488
489 s1 = as1;
490 s2 = as2;
491 while (*s1++ == *s2)
492 if (*s2++ == '\0')
493 return(1);
494 return(*--s1 == '\0');
495 }
496
497 /*
498 * The following gets called on receipt of an interrupt. This is
499 * to abort printout of a command, mainly.
500 * Dispatching here when command() is inactive crashes rcv.
501 * Close all open files except 0, 1, 2, and the temporary.
502 * Also, unstack all source files.
503 */
504
505 int inithdr; /* am printing startup headers */
506
507 /*ARGSUSED*/
508 void
intr(s)509 intr(s)
510 int s;
511 {
512
513 noreset = 0;
514 if (!inithdr)
515 sawcom++;
516 inithdr = 0;
517 while (sourcing)
518 unstack();
519
520 close_all_files();
521
522 if (image >= 0) {
523 close(image);
524 image = -1;
525 }
526 fprintf(stderr, "Interrupt\n");
527 reset(0);
528 }
529
530 /*
531 * When we wake up after ^Z, reprint the prompt.
532 */
533 void
stop(s)534 stop(s)
535 int s;
536 {
537 sig_t old_action = signal(s, SIG_DFL);
538
539 sigsetmask(sigblock(0) & ~sigmask(s));
540 kill(0, s);
541 sigblock(sigmask(s));
542 signal(s, old_action);
543 if (reset_on_stop) {
544 reset_on_stop = 0;
545 reset(0);
546 }
547 }
548
549 /*
550 * Branch here on hangup signal and simulate "exit".
551 */
552 /*ARGSUSED*/
553 void
hangup(s)554 hangup(s)
555 int s;
556 {
557
558 /* nothing to do? */
559 exit(1);
560 }
561
562 /*
563 * Announce the presence of the current Mail version,
564 * give the message count, and print a header listing.
565 */
566 void
announce()567 announce()
568 {
569 int vec[2], mdot;
570
571 mdot = newfileinfo(0);
572 vec[0] = mdot;
573 vec[1] = 0;
574 dot = &message[mdot - 1];
575 if (msgCount > 0 && value("noheader") == NOSTR) {
576 inithdr++;
577 headers(vec);
578 inithdr = 0;
579 }
580 }
581
582 /*
583 * Announce information about the file we are editing.
584 * Return a likely place to set dot.
585 */
586 int
newfileinfo(omsgCount)587 newfileinfo(omsgCount)
588 int omsgCount;
589 {
590 register struct message *mp;
591 register int u, n, mdot, d, s;
592 char fname[BUFSIZ], zname[BUFSIZ], *ename;
593
594 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
595 if (mp->m_flag & MNEW)
596 break;
597 if (mp >= &message[msgCount])
598 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
599 if ((mp->m_flag & MREAD) == 0)
600 break;
601 if (mp < &message[msgCount])
602 mdot = mp - &message[0] + 1;
603 else
604 mdot = omsgCount + 1;
605 s = d = 0;
606 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) {
607 if (mp->m_flag & MNEW)
608 n++;
609 if ((mp->m_flag & MREAD) == 0)
610 u++;
611 if (mp->m_flag & MDELETED)
612 d++;
613 if (mp->m_flag & MSAVED)
614 s++;
615 }
616 ename = mailname;
617 if (getfold(fname) >= 0) {
618 strcat(fname, "/");
619 if (strncmp(fname, mailname, strlen(fname)) == 0) {
620 sprintf(zname, "+%s", mailname + strlen(fname));
621 ename = zname;
622 }
623 }
624 printf("\"%s\": ", ename);
625 if (msgCount == 1)
626 printf("1 message");
627 else
628 printf("%d messages", msgCount);
629 if (n > 0)
630 printf(" %d new", n);
631 if (u-n > 0)
632 printf(" %d unread", u);
633 if (d > 0)
634 printf(" %d deleted", d);
635 if (s > 0)
636 printf(" %d saved", s);
637 if (readonly)
638 printf(" [Read only]");
639 printf("\n");
640 return(mdot);
641 }
642
643 /*
644 * Print the current version number.
645 */
646
647 /*ARGSUSED*/
648 int
pversion(e)649 pversion(e)
650 int e;
651 {
652 extern char *version;
653
654 printf("Version %s\n", version);
655 return(0);
656 }
657
658 /*
659 * Load a file of user definitions.
660 */
661 void
load(name)662 load(name)
663 char *name;
664 {
665 register FILE *in, *oldin;
666
667 if ((in = Fopen(name, "r")) == NULL)
668 return;
669 oldin = input;
670 input = in;
671 loading = 1;
672 sourcing = 1;
673 commands();
674 loading = 0;
675 sourcing = 0;
676 input = oldin;
677 Fclose(in);
678 }
679