1 /* $OpenBSD: lex.c,v 1.43 2023/03/08 04:43:11 guenther Exp $ */
2 /* $NetBSD: lex.c,v 1.10 1997/05/17 19:55:13 pk Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "rcv.h"
34 #include <errno.h>
35 #include <fcntl.h>
36 #include "extern.h"
37
38 /*
39 * Mail -- a mail program
40 *
41 * Lexical processing of commands.
42 */
43
44 char *prompt = "& ";
45
46 const struct cmd *com; /* command we are running */
47
48 /*
49 * Set up editing on the given file name.
50 * If the first character of name is %, we are considered to be
51 * editing the file, otherwise we are reading our mail which has
52 * signficance for mbox and so forth.
53 */
54 int
setfile(char * name)55 setfile(char *name)
56 {
57 FILE *ibuf;
58 int i, fd;
59 struct stat stb;
60 char isedit = *name != '%';
61 const char *who = name[1] ? name + 1 : myname;
62 char tempname[PATHSIZE];
63 static int shudclob;
64
65 if ((name = expand(name)) == NULL)
66 return(-1);
67
68 if ((ibuf = Fopen(name, "r")) == NULL) {
69 if (!isedit && errno == ENOENT)
70 goto nomail;
71 warn("%s", name);
72 return(-1);
73 }
74
75 if (fstat(fileno(ibuf), &stb) == -1) {
76 warn("fstat");
77 (void)Fclose(ibuf);
78 return(-1);
79 }
80
81 switch (stb.st_mode & S_IFMT) {
82 case S_IFDIR:
83 (void)Fclose(ibuf);
84 warnc(EISDIR, "%s", name);
85 return(-1);
86
87 case S_IFREG:
88 break;
89
90 default:
91 (void)Fclose(ibuf);
92 warnc(EINVAL, "%s", name);
93 return(-1);
94 }
95
96 /*
97 * Looks like all will be well. We must now relinquish our
98 * hold on the current set of stuff. Must hold signals
99 * while we are reading the new file, else we will ruin
100 * the message[] data structure.
101 */
102 holdsigs();
103 if (shudclob)
104 quit();
105
106 /*
107 * Copy the messages into /tmp
108 * and set pointers.
109 */
110 readonly = 0;
111 if ((i = open(name, O_WRONLY)) == -1)
112 readonly++;
113 else
114 (void)close(i);
115 if (shudclob) {
116 (void)fclose(itf);
117 (void)fclose(otf);
118 }
119 shudclob = 1;
120 edit = isedit;
121 strlcpy(prevfile, mailname, PATHSIZE);
122 if (name != mailname)
123 strlcpy(mailname, name, sizeof(mailname));
124 mailsize = fsize(ibuf);
125 (void)snprintf(tempname, sizeof(tempname),
126 "%s/mail.RxXXXXXXXXXX", tmpdir);
127 if ((fd = mkostemp(tempname, O_CLOEXEC)) == -1 ||
128 (otf = fdopen(fd, "w")) == NULL)
129 err(1, "%s", tempname);
130 if ((itf = fopen(tempname, "re")) == NULL)
131 err(1, "%s", tempname);
132 (void)rm(tempname);
133 setptr(ibuf, (off_t)0);
134 setmsize(msgCount);
135 /*
136 * New mail may have arrived while we were reading
137 * the mail file, so reset mailsize to be where
138 * we really are in the file...
139 */
140 mailsize = ftell(ibuf);
141 (void)Fclose(ibuf);
142 relsesigs();
143 sawcom = 0;
144 if (!edit && msgCount == 0) {
145 nomail:
146 fprintf(stderr, "No mail for %s\n", who);
147 return(-1);
148 }
149 return(0);
150 }
151
152 /*
153 * Incorporate any new mail that has arrived since we first
154 * started reading mail.
155 */
156 int
incfile(void)157 incfile(void)
158 {
159 int newsize;
160 int omsgCount = msgCount;
161 FILE *ibuf;
162
163 ibuf = Fopen(mailname, "r");
164 if (ibuf == NULL)
165 return(-1);
166 holdsigs();
167 if (!spool_lock()) {
168 (void)Fclose(ibuf);
169 relsesigs();
170 return(-1);
171 }
172 newsize = fsize(ibuf);
173 /* make sure mail box has grown and is non-empty */
174 if (newsize == 0 || newsize <= mailsize) {
175 (void)Fclose(ibuf);
176 spool_unlock();
177 relsesigs();
178 return(newsize == mailsize ? 0 : -1);
179 }
180 setptr(ibuf, mailsize);
181 setmsize(msgCount);
182 mailsize = ftell(ibuf);
183 (void)Fclose(ibuf);
184 spool_unlock();
185 relsesigs();
186 return(msgCount - omsgCount);
187 }
188
189
190 int *msgvec;
191 int reset_on_stop; /* reset prompt if stopped */
192
193 /*
194 * Interpret user commands one by one. If standard input is not a tty,
195 * print no prompt.
196 */
197 void
commands(void)198 commands(void)
199 {
200 int n, sig, *sigp;
201 int eofloop = 0;
202 char linebuf[LINESIZE];
203
204 prompt:
205 for (;;) {
206 /*
207 * Print the prompt, if needed. Clear out
208 * string space, and flush the output.
209 */
210 if (!sourcing && value("interactive") != NULL) {
211 if ((value("autoinc") != NULL) && (incfile() > 0))
212 puts("New mail has arrived.");
213 reset_on_stop = 1;
214 printf("%s", prompt);
215 }
216 fflush(stdout);
217 sreset();
218 /*
219 * Read a line of commands from the current input
220 * and handle end of file specially.
221 */
222 n = 0;
223 sig = 0;
224 sigp = sourcing ? NULL : &sig;
225 for (;;) {
226 if (readline(input, &linebuf[n], LINESIZE - n, sigp) < 0) {
227 if (sig) {
228 if (sig == SIGINT)
229 dointr();
230 else if (sig == SIGHUP)
231 /* nothing to do? */
232 exit(1);
233 else {
234 /* Stopped by job control */
235 (void)kill(0, sig);
236 if (reset_on_stop)
237 reset_on_stop = 0;
238 }
239 goto prompt;
240 }
241 if (n == 0)
242 n = -1;
243 break;
244 }
245 if ((n = strlen(linebuf)) == 0)
246 break;
247 n--;
248 if (linebuf[n] != '\\')
249 break;
250 linebuf[n++] = ' ';
251 }
252 reset_on_stop = 0;
253 if (n < 0) {
254 /* eof */
255 if (loading)
256 break;
257 if (sourcing) {
258 unstack();
259 continue;
260 }
261 if (value("interactive") != NULL &&
262 value("ignoreeof") != NULL &&
263 ++eofloop < 25) {
264 puts("Use \"quit\" to quit.");
265 continue;
266 }
267 break;
268 }
269 eofloop = 0;
270 if (execute(linebuf, 0))
271 break;
272 }
273 }
274
275 /*
276 * Execute a single command.
277 * Command functions return 0 for success, 1 for error, and -1
278 * for abort. A 1 or -1 aborts a load or source. A -1 aborts
279 * the interactive command loop.
280 * Contxt is non-zero if called while composing mail.
281 */
282 int
execute(char * linebuf,int contxt)283 execute(char *linebuf, int contxt)
284 {
285 char word[LINESIZE];
286 char *arglist[MAXARGC];
287 char *cp, *cp2;
288 int c, muvec[2];
289 int e = 1;
290
291 com = NULL;
292
293 /*
294 * Strip the white space away from the beginning
295 * of the command, then scan out a word, which
296 * consists of anything except digits and white space.
297 *
298 * Handle ! escapes differently to get the correct
299 * lexical conventions.
300 */
301 for (cp = linebuf; isspace((unsigned char)*cp); cp++)
302 ;
303 if (*cp == '!') {
304 if (sourcing) {
305 puts("Can't \"!\" while sourcing");
306 goto out;
307 }
308 shell(cp+1);
309 return(0);
310 }
311 cp2 = word;
312 while (*cp &&
313 strchr(" \t0123456789$^.:/-+*'\"", (unsigned char)*cp) == NULL)
314 *cp2++ = *cp++;
315 *cp2 = '\0';
316
317 /*
318 * Look up the command; if not found, bitch.
319 * Normally, a blank command would map to the
320 * first command in the table; while sourcing,
321 * however, we ignore blank lines to eliminate
322 * confusion.
323 */
324 if (sourcing && *word == '\0')
325 return(0);
326 com = lex(word);
327 if (com == NULL) {
328 printf("Unknown command: \"%s\"\n", word);
329 goto out;
330 }
331
332 /*
333 * See if we should execute the command -- if a conditional
334 * we always execute it, otherwise, check the state of cond.
335 */
336 if ((com->c_argtype & F) == 0)
337 if ((cond == CRCV && !rcvmode) || (cond == CSEND && rcvmode))
338 return(0);
339
340 /*
341 * Process the arguments to the command, depending
342 * on the type he expects. Default to an error.
343 * If we are sourcing an interactive command, it's
344 * an error.
345 */
346 if (!rcvmode && (com->c_argtype & M) == 0) {
347 printf("May not execute \"%s\" while sending\n",
348 com->c_name);
349 goto out;
350 }
351 if (sourcing && com->c_argtype & I) {
352 printf("May not execute \"%s\" while sourcing\n",
353 com->c_name);
354 goto out;
355 }
356 if (readonly && com->c_argtype & W) {
357 printf("May not execute \"%s\" -- message file is read only\n",
358 com->c_name);
359 goto out;
360 }
361 if (contxt && com->c_argtype & R) {
362 printf("Cannot recursively invoke \"%s\"\n", com->c_name);
363 goto out;
364 }
365 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) {
366 case MSGLIST|STRLIST:
367 /*
368 * A message list defaulting to nearest forward
369 * legal message.
370 */
371 if (msgvec == 0) {
372 puts("Illegal use of \"message list\"");
373 break;
374 }
375 /*
376 * remove leading blanks.
377 */
378 while (isspace((unsigned char)*cp))
379 cp++;
380
381 if (isdigit((unsigned char)*cp) || *cp == ':') {
382 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
383 break;
384 /* position to next space - past the message list */
385 while (!isspace((unsigned char)*cp))
386 cp++;
387 /* position to next non-space */
388 while (isspace((unsigned char)*cp))
389 cp++;
390 } else {
391 c = 0; /* no message list */
392 }
393
394 if (c == 0) {
395 *msgvec = first(com->c_msgflag,
396 com->c_msgmask);
397 msgvec[1] = 0;
398 }
399 if (*msgvec == 0) {
400 puts("No applicable messages");
401 break;
402 }
403 /*
404 * Just the straight string, with
405 * leading blanks removed.
406 */
407 while (isspace((unsigned char)*cp))
408 cp++;
409
410 e = (*com->c_func2)(msgvec, cp);
411 break;
412
413 case MSGLIST:
414 /*
415 * A message list defaulting to nearest forward
416 * legal message.
417 */
418 if (msgvec == NULL) {
419 puts("Illegal use of \"message list\"");
420 break;
421 }
422 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0)
423 break;
424 if (c == 0) {
425 *msgvec = first(com->c_msgflag,
426 com->c_msgmask);
427 msgvec[1] = 0;
428 }
429 if (*msgvec == 0) {
430 puts("No applicable messages");
431 break;
432 }
433 e = (*com->c_func)(msgvec);
434 break;
435
436 case NDMLIST:
437 /*
438 * A message list with no defaults, but no error
439 * if none exist.
440 */
441 if (msgvec == 0) {
442 puts("Illegal use of \"message list\"");
443 break;
444 }
445 if (getmsglist(cp, msgvec, com->c_msgflag) < 0)
446 break;
447 e = (*com->c_func)(msgvec);
448 break;
449
450 case STRLIST:
451 /*
452 * Just the straight string, with
453 * leading blanks removed.
454 */
455 while (isspace((unsigned char)*cp))
456 cp++;
457 e = (*com->c_func)(cp);
458 break;
459
460 case RAWLIST:
461 /*
462 * A vector of strings, in shell style.
463 */
464 if ((c = getrawlist(cp, arglist,
465 sizeof(arglist) / sizeof(*arglist))) < 0)
466 break;
467 if (c < com->c_minargs) {
468 printf("%s requires at least %d arg(s)\n",
469 com->c_name, com->c_minargs);
470 break;
471 }
472 if (c > com->c_maxargs) {
473 printf("%s takes no more than %d arg(s)\n",
474 com->c_name, com->c_maxargs);
475 break;
476 }
477 e = (*com->c_func)(arglist);
478 break;
479
480 case NOLIST:
481 /*
482 * Just the constant zero, for exiting,
483 * eg.
484 */
485 e = (*com->c_func)(0);
486 break;
487
488 default:
489 errx(1, "Unknown argtype");
490 }
491
492 out:
493 /*
494 * Exit the current source file on
495 * error.
496 */
497 if (e) {
498 if (e < 0)
499 return(1);
500 if (loading)
501 return(1);
502 if (sourcing)
503 unstack();
504 return(0);
505 }
506 if (com == NULL)
507 return(0);
508 if (value("autoprint") != NULL && com->c_argtype & P)
509 if ((dot->m_flag & MDELETED) == 0) {
510 muvec[0] = dot - &message[0] + 1;
511 muvec[1] = 0;
512 type(muvec);
513 }
514 if (!sourcing && (com->c_argtype & T) == 0)
515 sawcom = 1;
516 return(0);
517 }
518
519 /*
520 * Set the size of the message vector used to construct argument
521 * lists to message list functions.
522 */
523 void
setmsize(int n)524 setmsize(int n)
525 {
526 int *msgvec2;
527 size_t msize;
528
529 msize = (n + 1) * sizeof(*msgvec);
530 if ((msgvec2 = realloc(msgvec, msize)) == NULL)
531 err(1, "realloc");
532 msgvec = msgvec2;
533 memset(msgvec, 0, msize);
534 }
535
536 /*
537 * Find the correct command in the command table corresponding
538 * to the passed command "word"
539 */
540
541 const struct cmd *
lex(char * word)542 lex(char *word)
543 {
544 extern const struct cmd cmdtab[];
545 const struct cmd *cp;
546
547 if (word[0] == '#')
548 word = "#";
549 for (cp = &cmdtab[0]; cp->c_name != NULL; cp++)
550 if (isprefix(word, cp->c_name))
551 return(cp);
552 return(NULL);
553 }
554
555 /*
556 * Determine if as1 is a valid prefix of as2.
557 * Return true if yep.
558 */
559 int
isprefix(char * as1,char * as2)560 isprefix(char *as1, char *as2)
561 {
562 char *s1, *s2;
563
564 s1 = as1;
565 s2 = as2;
566 while (*s1++ == *s2)
567 if (*s2++ == '\0')
568 return(1);
569 return(*--s1 == '\0');
570 }
571
572 /*
573 * The following gets called on receipt of an interrupt. This is
574 * to abort printout of a command, mainly.
575 * Dispatching here when command() is inactive crashes rcv.
576 * Close all open files except 0, 1, 2, and the temporary.
577 * Also, unstack all source files.
578 */
579 int inithdr; /* am printing startup headers */
580
581 void
dointr(void)582 dointr(void)
583 {
584
585 noreset = 0;
586 if (!inithdr)
587 sawcom++;
588 inithdr = 0;
589 while (sourcing)
590 unstack();
591
592 close_all_files();
593
594 if (image >= 0) {
595 (void)close(image);
596 image = -1;
597 }
598 fputs("Interrupt\n", stderr);
599 }
600
601 /*
602 * Announce the presence of the current Mail version,
603 * give the message count, and print a header listing.
604 */
605 void
announce(void)606 announce(void)
607 {
608 int vec[2], mdot;
609
610 mdot = newfileinfo(0);
611 vec[0] = mdot;
612 vec[1] = 0;
613 dot = &message[mdot - 1];
614 if (msgCount > 0 && value("noheader") == NULL) {
615 inithdr++;
616 headers(vec);
617 inithdr = 0;
618 }
619 }
620
621 /*
622 * Announce information about the file we are editing.
623 * Return a likely place to set dot.
624 */
625 int
newfileinfo(int omsgCount)626 newfileinfo(int omsgCount)
627 {
628 struct message *mp;
629 int u, n, mdot, d, s;
630 char fname[PATHSIZE], zname[PATHSIZE], *ename;
631
632 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
633 if (mp->m_flag & MNEW)
634 break;
635 if (mp >= &message[msgCount])
636 for (mp = &message[omsgCount]; mp < &message[msgCount]; mp++)
637 if ((mp->m_flag & MREAD) == 0)
638 break;
639 if (mp < &message[msgCount])
640 mdot = mp - &message[0] + 1;
641 else
642 mdot = omsgCount + 1;
643 s = d = 0;
644 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) {
645 if (mp->m_flag & MNEW)
646 n++;
647 if ((mp->m_flag & MREAD) == 0)
648 u++;
649 if (mp->m_flag & MDELETED)
650 d++;
651 if (mp->m_flag & MSAVED)
652 s++;
653 }
654 ename = mailname;
655 if (getfold(fname, sizeof(fname)) >= 0) {
656 strlcat(fname, "/", sizeof(fname));
657 if (strncmp(fname, mailname, strlen(fname)) == 0) {
658 (void)snprintf(zname, sizeof(zname), "+%s",
659 mailname + strlen(fname));
660 ename = zname;
661 }
662 }
663 printf("\"%s\": ", ename);
664 if (msgCount == 1)
665 fputs("1 message", stdout);
666 else
667 printf("%d messages", msgCount);
668 if (n > 0)
669 printf(" %d new", n);
670 if (u-n > 0)
671 printf(" %d unread", u);
672 if (d > 0)
673 printf(" %d deleted", d);
674 if (s > 0)
675 printf(" %d saved", s);
676 if (readonly)
677 fputs(" [Read only]", stdout);
678 putchar('\n');
679 return(mdot);
680 }
681
682 /*
683 * Print the current version number.
684 */
685 int
pversion(void * v)686 pversion(void *v)
687 {
688 extern const char version[];
689
690 printf("Version %s\n", version);
691 return(0);
692 }
693
694 /*
695 * Load a file of user definitions.
696 */
697 void
load(char * name)698 load(char *name)
699 {
700 FILE *in, *oldin;
701
702 if ((in = Fopen(name, "r")) == NULL)
703 return;
704 oldin = input;
705 input = in;
706 loading = 1;
707 sourcing = 1;
708 commands();
709 loading = 0;
710 sourcing = 0;
711 input = oldin;
712 (void)Fclose(in);
713 }
714