| 1 | # |
| 2 | |
| 3 | #include "rcv.h" |
| 4 | |
| 5 | /* |
| 6 | * Mail -- a mail program |
| 7 | * |
| 8 | * Lexical processing of commands. |
| 9 | */ |
| 10 | |
| 11 | static char *SccsId = "@(#)lex.c 2.11 %G%"; |
| 12 | |
| 13 | char *prompt = "& "; |
| 14 | |
| 15 | /* |
| 16 | * Set up editing on the given file name. |
| 17 | * If isedit is true, we are considered to be editing the file, |
| 18 | * otherwise we are reading our mail which has signficance for |
| 19 | * mbox and so forth. |
| 20 | */ |
| 21 | |
| 22 | setfile(name, isedit) |
| 23 | char *name; |
| 24 | { |
| 25 | FILE *ibuf; |
| 26 | int i; |
| 27 | static int shudclob; |
| 28 | static char efile[128]; |
| 29 | extern char tempMesg[]; |
| 30 | |
| 31 | if ((ibuf = fopen(name, "r")) == NULL) |
| 32 | return(-1); |
| 33 | |
| 34 | /* |
| 35 | * Looks like all will be well. We must now relinquish our |
| 36 | * hold on the current set of stuff. Must hold signals |
| 37 | * while we are reading the new file, else we will ruin |
| 38 | * the message[] data structure. |
| 39 | */ |
| 40 | |
| 41 | holdsigs(); |
| 42 | if (shudclob) { |
| 43 | if (edit) |
| 44 | edstop(); |
| 45 | else |
| 46 | quit(); |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Copy the messages into /tmp |
| 51 | * and set pointers. |
| 52 | */ |
| 53 | |
| 54 | readonly = 0; |
| 55 | if ((i = open(name, 1)) < 0) |
| 56 | readonly++; |
| 57 | else |
| 58 | close(i); |
| 59 | if (shudclob) { |
| 60 | fclose(itf); |
| 61 | fclose(otf); |
| 62 | } |
| 63 | shudclob = 1; |
| 64 | edit = isedit; |
| 65 | strncpy(efile, name, 128); |
| 66 | editfile = efile; |
| 67 | if (name != mailname) |
| 68 | strcpy(mailname, name); |
| 69 | mailsize = fsize(ibuf); |
| 70 | if ((otf = fopen(tempMesg, "w")) == NULL) { |
| 71 | perror(tempMesg); |
| 72 | exit(1); |
| 73 | } |
| 74 | if ((itf = fopen(tempMesg, "r")) == NULL) { |
| 75 | perror(tempMesg); |
| 76 | exit(1); |
| 77 | } |
| 78 | remove(tempMesg); |
| 79 | setptr(ibuf); |
| 80 | setmsize(msgCount); |
| 81 | fclose(ibuf); |
| 82 | relsesigs(); |
| 83 | sawcom = 0; |
| 84 | return(0); |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Interpret user commands one by one. If standard input is not a tty, |
| 89 | * print no prompt. |
| 90 | */ |
| 91 | |
| 92 | int *msgvec; |
| 93 | |
| 94 | commands() |
| 95 | { |
| 96 | int eofloop, shudprompt, stop(); |
| 97 | register int n; |
| 98 | char linebuf[LINESIZE]; |
| 99 | int hangup(), contin(); |
| 100 | |
| 101 | # ifdef VMUNIX |
| 102 | sigset(SIGCONT, SIG_DFL); |
| 103 | # endif VMUNIX |
| 104 | if (rcvmode && !sourcing) { |
| 105 | if (sigset(SIGINT, SIG_IGN) != SIG_IGN) |
| 106 | sigset(SIGINT, stop); |
| 107 | if (sigset(SIGHUP, SIG_IGN) != SIG_IGN) |
| 108 | sigset(SIGHUP, hangup); |
| 109 | } |
| 110 | shudprompt = intty && !sourcing; |
| 111 | for (;;) { |
| 112 | setexit(); |
| 113 | |
| 114 | /* |
| 115 | * Print the prompt, if needed. Clear out |
| 116 | * string space, and flush the output. |
| 117 | */ |
| 118 | |
| 119 | if (!rcvmode && !sourcing) |
| 120 | return; |
| 121 | eofloop = 0; |
| 122 | top: |
| 123 | if (shudprompt) { |
| 124 | # ifdef VMUNIX |
| 125 | sigset(SIGCONT, contin); |
| 126 | # endif VMUNIX |
| 127 | printf(prompt); |
| 128 | } |
| 129 | flush(); |
| 130 | sreset(); |
| 131 | |
| 132 | /* |
| 133 | * Read a line of commands from the current input |
| 134 | * and handle end of file specially. |
| 135 | */ |
| 136 | |
| 137 | n = 0; |
| 138 | for (;;) { |
| 139 | if (readline(input, &linebuf[n]) <= 0) { |
| 140 | if (n != 0) |
| 141 | break; |
| 142 | if (loading) |
| 143 | return; |
| 144 | if (sourcing) { |
| 145 | unstack(); |
| 146 | goto more; |
| 147 | } |
| 148 | if (value("ignoreeof") != NOSTR && shudprompt) { |
| 149 | if (++eofloop < 25) { |
| 150 | printf("Use \"quit\" to quit.\n"); |
| 151 | goto top; |
| 152 | } |
| 153 | } |
| 154 | if (edit) |
| 155 | edstop(); |
| 156 | return; |
| 157 | } |
| 158 | if ((n = strlen(linebuf)) == 0) |
| 159 | break; |
| 160 | n--; |
| 161 | if (linebuf[n] != '\\') |
| 162 | break; |
| 163 | linebuf[n++] = ' '; |
| 164 | } |
| 165 | # ifdef VMUNIX |
| 166 | sigset(SIGCONT, SIG_DFL); |
| 167 | # endif VMUNIX |
| 168 | if (execute(linebuf, 0)) |
| 169 | return; |
| 170 | more: ; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Execute a single command. If the command executed |
| 176 | * is "quit," then return non-zero so that the caller |
| 177 | * will know to return back to main, if he cares. |
| 178 | * Contxt is non-zero if called while composing mail. |
| 179 | */ |
| 180 | |
| 181 | execute(linebuf, contxt) |
| 182 | char linebuf[]; |
| 183 | { |
| 184 | char word[LINESIZE]; |
| 185 | char *arglist[MAXARGC]; |
| 186 | struct cmd *com; |
| 187 | register char *cp, *cp2; |
| 188 | register int c; |
| 189 | int muvec[2]; |
| 190 | int edstop(), e; |
| 191 | |
| 192 | /* |
| 193 | * Strip the white space away from the beginning |
| 194 | * of the command, then scan out a word, which |
| 195 | * consists of anything except digits and white space. |
| 196 | * |
| 197 | * Handle ! escapes differently to get the correct |
| 198 | * lexical conventions. |
| 199 | */ |
| 200 | |
| 201 | cp = linebuf; |
| 202 | while (any(*cp, " \t")) |
| 203 | cp++; |
| 204 | if (*cp == '!') { |
| 205 | if (sourcing) { |
| 206 | printf("Can't \"!\" while sourcing\n"); |
| 207 | unstack(); |
| 208 | return(0); |
| 209 | } |
| 210 | shell(cp+1); |
| 211 | return(0); |
| 212 | } |
| 213 | cp2 = word; |
| 214 | while (*cp && !any(*cp, " \t0123456789$^.:/-+*'\"")) |
| 215 | *cp2++ = *cp++; |
| 216 | *cp2 = '\0'; |
| 217 | |
| 218 | /* |
| 219 | * Look up the command; if not found, bitch. |
| 220 | * Normally, a blank command would map to the |
| 221 | * first command in the table; while sourcing, |
| 222 | * however, we ignore blank lines to eliminate |
| 223 | * confusion. |
| 224 | */ |
| 225 | |
| 226 | if (sourcing && equal(word, "")) |
| 227 | return(0); |
| 228 | com = lex(word); |
| 229 | if (com == NONE) { |
| 230 | printf("Unknown command: \"%s\"\n", word); |
| 231 | if (loading) |
| 232 | return(1); |
| 233 | if (sourcing) |
| 234 | unstack(); |
| 235 | return(0); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * See if we should execute the command -- if a conditional |
| 240 | * we always execute it, otherwise, check the state of cond. |
| 241 | */ |
| 242 | |
| 243 | if ((com->c_argtype & F) == 0) |
| 244 | if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode) |
| 245 | return(0); |
| 246 | |
| 247 | /* |
| 248 | * Special case so that quit causes a return to |
| 249 | * main, who will call the quit code directly. |
| 250 | * If we are in a source file, just unstack. |
| 251 | */ |
| 252 | |
| 253 | if (com->c_func == edstop && sourcing) { |
| 254 | if (loading) |
| 255 | return(1); |
| 256 | unstack(); |
| 257 | return(0); |
| 258 | } |
| 259 | if (!edit && com->c_func == edstop) { |
| 260 | sigset(SIGINT, SIG_IGN); |
| 261 | return(1); |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Process the arguments to the command, depending |
| 266 | * on the type he expects. Default to an error. |
| 267 | * If we are sourcing an interactive command, it's |
| 268 | * an error. |
| 269 | */ |
| 270 | |
| 271 | if (!rcvmode && (com->c_argtype & M) == 0) { |
| 272 | printf("May not execute \"%s\" while sending\n", |
| 273 | com->c_name); |
| 274 | if (loading) |
| 275 | return(1); |
| 276 | if (sourcing) |
| 277 | unstack(); |
| 278 | return(0); |
| 279 | } |
| 280 | if (sourcing && com->c_argtype & I) { |
| 281 | printf("May not execute \"%s\" while sourcing\n", |
| 282 | com->c_name); |
| 283 | if (loading) |
| 284 | return(1); |
| 285 | unstack(); |
| 286 | return(0); |
| 287 | } |
| 288 | if (readonly && com->c_argtype & W) { |
| 289 | printf("May not execute \"%s\" -- message file is read only\n", |
| 290 | com->c_name); |
| 291 | if (loading) |
| 292 | return(1); |
| 293 | if (sourcing) |
| 294 | unstack(); |
| 295 | return(0); |
| 296 | } |
| 297 | if (contxt && com->c_argtype & R) { |
| 298 | printf("Cannot recursively invoke \"%s\"\n", com->c_name); |
| 299 | return(0); |
| 300 | } |
| 301 | e = 1; |
| 302 | switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { |
| 303 | case MSGLIST: |
| 304 | /* |
| 305 | * A message list defaulting to nearest forward |
| 306 | * legal message. |
| 307 | */ |
| 308 | if (msgvec == 0) { |
| 309 | printf("Illegal use of \"message list\"\n"); |
| 310 | return(-1); |
| 311 | } |
| 312 | if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) |
| 313 | break; |
| 314 | if (c == 0) { |
| 315 | *msgvec = first(com->c_msgflag, |
| 316 | com->c_msgmask); |
| 317 | msgvec[1] = NULL; |
| 318 | } |
| 319 | if (*msgvec == NULL) { |
| 320 | printf("No applicable messages\n"); |
| 321 | break; |
| 322 | } |
| 323 | e = (*com->c_func)(msgvec); |
| 324 | break; |
| 325 | |
| 326 | case NDMLIST: |
| 327 | /* |
| 328 | * A message list with no defaults, but no error |
| 329 | * if none exist. |
| 330 | */ |
| 331 | if (msgvec == 0) { |
| 332 | printf("Illegal use of \"message list\"\n"); |
| 333 | return(-1); |
| 334 | } |
| 335 | if (getmsglist(cp, msgvec, com->c_msgflag) < 0) |
| 336 | break; |
| 337 | e = (*com->c_func)(msgvec); |
| 338 | break; |
| 339 | |
| 340 | case STRLIST: |
| 341 | /* |
| 342 | * Just the straight string, with |
| 343 | * leading blanks removed. |
| 344 | */ |
| 345 | while (any(*cp, " \t")) |
| 346 | cp++; |
| 347 | e = (*com->c_func)(cp); |
| 348 | break; |
| 349 | |
| 350 | case RAWLIST: |
| 351 | /* |
| 352 | * A vector of strings, in shell style. |
| 353 | */ |
| 354 | if ((c = getrawlist(cp, arglist)) < 0) |
| 355 | break; |
| 356 | if (c < com->c_minargs) { |
| 357 | printf("%s requires at least %d arg(s)\n", |
| 358 | com->c_name, com->c_minargs); |
| 359 | break; |
| 360 | } |
| 361 | if (c > com->c_maxargs) { |
| 362 | printf("%s takes no more than %d arg(s)\n", |
| 363 | com->c_name, com->c_maxargs); |
| 364 | break; |
| 365 | } |
| 366 | e = (*com->c_func)(arglist); |
| 367 | break; |
| 368 | |
| 369 | case NOLIST: |
| 370 | /* |
| 371 | * Just the constant zero, for exiting, |
| 372 | * eg. |
| 373 | */ |
| 374 | e = (*com->c_func)(0); |
| 375 | break; |
| 376 | |
| 377 | default: |
| 378 | panic("Unknown argtype"); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Exit the current source file on |
| 383 | * error. |
| 384 | */ |
| 385 | |
| 386 | if (e && loading) |
| 387 | return(1); |
| 388 | if (e && sourcing) |
| 389 | unstack(); |
| 390 | if (com->c_func == edstop) |
| 391 | return(1); |
| 392 | if (value("autoprint") != NOSTR && com->c_argtype & P) |
| 393 | if ((dot->m_flag & MDELETED) == 0) { |
| 394 | muvec[0] = dot - &message[0] + 1; |
| 395 | muvec[1] = 0; |
| 396 | type(muvec); |
| 397 | } |
| 398 | if (!sourcing && (com->c_argtype & T) == 0) |
| 399 | sawcom = 1; |
| 400 | return(0); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * When we wake up after ^Z, reprint the prompt. |
| 405 | */ |
| 406 | contin(s) |
| 407 | { |
| 408 | |
| 409 | printf(prompt); |
| 410 | fflush(stdout); |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Branch here on hangup signal and simulate quit. |
| 415 | */ |
| 416 | hangup() |
| 417 | { |
| 418 | |
| 419 | holdsigs(); |
| 420 | if (edit) { |
| 421 | if (setexit()) |
| 422 | exit(0); |
| 423 | edstop(); |
| 424 | } |
| 425 | else |
| 426 | quit(); |
| 427 | exit(0); |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Set the size of the message vector used to construct argument |
| 432 | * lists to message list functions. |
| 433 | */ |
| 434 | |
| 435 | setmsize(sz) |
| 436 | { |
| 437 | |
| 438 | if (msgvec != (int *) 0) |
| 439 | cfree(msgvec); |
| 440 | msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Find the correct command in the command table corresponding |
| 445 | * to the passed command "word" |
| 446 | */ |
| 447 | |
| 448 | struct cmd * |
| 449 | lex(word) |
| 450 | char word[]; |
| 451 | { |
| 452 | register struct cmd *cp; |
| 453 | extern struct cmd cmdtab[]; |
| 454 | |
| 455 | for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) |
| 456 | if (isprefix(word, cp->c_name)) |
| 457 | return(cp); |
| 458 | return(NONE); |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Determine if as1 is a valid prefix of as2. |
| 463 | * Return true if yep. |
| 464 | */ |
| 465 | |
| 466 | isprefix(as1, as2) |
| 467 | char *as1, *as2; |
| 468 | { |
| 469 | register char *s1, *s2; |
| 470 | |
| 471 | s1 = as1; |
| 472 | s2 = as2; |
| 473 | while (*s1++ == *s2) |
| 474 | if (*s2++ == '\0') |
| 475 | return(1); |
| 476 | return(*--s1 == '\0'); |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * The following gets called on receipt of a rubout. This is |
| 481 | * to abort printout of a command, mainly. |
| 482 | * Dispatching here when command() is inactive crashes rcv. |
| 483 | * Close all open files except 0, 1, 2, and the temporary. |
| 484 | * The special call to getuserid() is needed so it won't get |
| 485 | * annoyed about losing its open file. |
| 486 | * Also, unstack all source files. |
| 487 | */ |
| 488 | |
| 489 | int inithdr; /* am printing startup headers */ |
| 490 | |
| 491 | stop(s) |
| 492 | { |
| 493 | register FILE *fp; |
| 494 | |
| 495 | # ifndef VMUNIX |
| 496 | s = SIGINT; |
| 497 | # endif VMUNIX |
| 498 | noreset = 0; |
| 499 | if (!inithdr) |
| 500 | sawcom++; |
| 501 | inithdr = 0; |
| 502 | while (sourcing) |
| 503 | unstack(); |
| 504 | getuserid((char *) -1); |
| 505 | for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) { |
| 506 | if (fp == stdin || fp == stdout) |
| 507 | continue; |
| 508 | if (fp == itf || fp == otf) |
| 509 | continue; |
| 510 | if (fp == stderr) |
| 511 | continue; |
| 512 | if (fp == pipef) { |
| 513 | pclose(pipef); |
| 514 | pipef = NULL; |
| 515 | continue; |
| 516 | } |
| 517 | fclose(fp); |
| 518 | } |
| 519 | if (image >= 0) { |
| 520 | close(image); |
| 521 | image = -1; |
| 522 | } |
| 523 | clrbuf(stdout); |
| 524 | printf("Interrupt\n"); |
| 525 | # ifdef VMUNIX |
| 526 | sigrelse(s); |
| 527 | # else |
| 528 | signal(s, stop); |
| 529 | # endif |
| 530 | reset(0); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Announce the presence of the current Mail version, |
| 535 | * give the message count, and print a header listing. |
| 536 | */ |
| 537 | |
| 538 | char *greeting = "Mail version %s. Type ? for help.\n"; |
| 539 | |
| 540 | announce(pr) |
| 541 | { |
| 542 | int vec[2], mdot; |
| 543 | extern char *version; |
| 544 | |
| 545 | if (pr && value("quiet") == NOSTR) |
| 546 | printf(greeting, version); |
| 547 | mdot = newfileinfo(); |
| 548 | vec[0] = mdot; |
| 549 | vec[1] = 0; |
| 550 | dot = &message[mdot - 1]; |
| 551 | if (msgCount > 0 && !noheader) { |
| 552 | inithdr++; |
| 553 | headers(vec); |
| 554 | inithdr = 0; |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Announce information about the file we are editing. |
| 560 | * Return a likely place to set dot. |
| 561 | */ |
| 562 | newfileinfo() |
| 563 | { |
| 564 | register struct message *mp; |
| 565 | register int u, n, mdot, d, s; |
| 566 | char fname[BUFSIZ], zname[BUFSIZ], *ename; |
| 567 | |
| 568 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 569 | if (mp->m_flag & MNEW) |
| 570 | break; |
| 571 | if (mp >= &message[msgCount]) |
| 572 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 573 | if ((mp->m_flag & MREAD) == 0) |
| 574 | break; |
| 575 | if (mp < &message[msgCount]) |
| 576 | mdot = mp - &message[0] + 1; |
| 577 | else |
| 578 | mdot = 1; |
| 579 | s = d = 0; |
| 580 | for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { |
| 581 | if (mp->m_flag & MNEW) |
| 582 | n++; |
| 583 | if ((mp->m_flag & MREAD) == 0) |
| 584 | u++; |
| 585 | if (mp->m_flag & MDELETED) |
| 586 | d++; |
| 587 | if (mp->m_flag & MSAVED) |
| 588 | s++; |
| 589 | } |
| 590 | ename = mailname; |
| 591 | if (getfold(fname) >= 0) { |
| 592 | strcat(fname, "/"); |
| 593 | if (strncmp(fname, mailname, strlen(fname)) == 0) { |
| 594 | sprintf(zname, "+%s", mailname + strlen(fname)); |
| 595 | ename = zname; |
| 596 | } |
| 597 | } |
| 598 | printf("\"%s\": ", ename); |
| 599 | if (msgCount == 1) |
| 600 | printf("1 message"); |
| 601 | else |
| 602 | printf("%d messages", msgCount); |
| 603 | if (n > 0) |
| 604 | printf(" %d new", n); |
| 605 | if (u-n > 0) |
| 606 | printf(" %d unread", u); |
| 607 | if (d > 0) |
| 608 | printf(" %d deleted", d); |
| 609 | if (s > 0) |
| 610 | printf(" %d saved", s); |
| 611 | if (readonly) |
| 612 | printf(" [Read only]"); |
| 613 | printf("\n"); |
| 614 | return(mdot); |
| 615 | } |
| 616 | |
| 617 | strace() {} |
| 618 | |
| 619 | /* |
| 620 | * Print the current version number. |
| 621 | */ |
| 622 | |
| 623 | pversion(e) |
| 624 | { |
| 625 | printf("Version %s\n", version); |
| 626 | return(0); |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Load a file of user definitions. |
| 631 | */ |
| 632 | load(name) |
| 633 | char *name; |
| 634 | { |
| 635 | register FILE *in, *oldin; |
| 636 | |
| 637 | if ((in = fopen(name, "r")) == NULL) |
| 638 | return; |
| 639 | oldin = input; |
| 640 | input = in; |
| 641 | loading = 1; |
| 642 | sourcing = 1; |
| 643 | commands(); |
| 644 | loading = 0; |
| 645 | sourcing = 0; |
| 646 | input = oldin; |
| 647 | fclose(in); |
| 648 | } |