| 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 1.16 %G%"; |
| 12 | |
| 13 | /* |
| 14 | * Set up editing on the given file name. |
| 15 | * If isedit is true, we are considered to be editing the file, |
| 16 | * otherwise we are reading our mail which has signficance for |
| 17 | * mbox and so forth. |
| 18 | */ |
| 19 | |
| 20 | setfile(name, isedit) |
| 21 | char *name; |
| 22 | { |
| 23 | FILE *ibuf; |
| 24 | int i; |
| 25 | static int shudclob; |
| 26 | static char efile[128]; |
| 27 | extern char tempMesg[]; |
| 28 | int (*sigs[3])(); |
| 29 | |
| 30 | if ((ibuf = fopen(name, "r")) == NULL) { |
| 31 | if (isedit) |
| 32 | perror(name); |
| 33 | else |
| 34 | printf("No mail for %s\n", myname); |
| 35 | return(-1); |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * Looks like all will be well. We must now relinquish our |
| 40 | * hold on the current set of stuff. Must ignore signals |
| 41 | * while we are reading the new file, else we will ruin |
| 42 | * the message[] data structure. |
| 43 | */ |
| 44 | |
| 45 | sigsave(sigs, SIG_IGN); |
| 46 | if (shudclob) { |
| 47 | if (edit) |
| 48 | edstop(); |
| 49 | else |
| 50 | quit(); |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Copy the messages into /tmp |
| 55 | * and set pointers. |
| 56 | */ |
| 57 | |
| 58 | readonly = 0; |
| 59 | if ((i = open(name, 1)) < 0) |
| 60 | readonly++; |
| 61 | else |
| 62 | close(i); |
| 63 | if (shudclob) { |
| 64 | fclose(itf); |
| 65 | fclose(otf); |
| 66 | } |
| 67 | shudclob = 1; |
| 68 | edit = isedit; |
| 69 | strncpy(efile, name, 128); |
| 70 | editfile = efile; |
| 71 | if (name != mailname) |
| 72 | strcpy(mailname, name); |
| 73 | mailsize = fsize(ibuf); |
| 74 | if ((otf = fopen(tempMesg, "w")) == NULL) { |
| 75 | perror(tempMesg); |
| 76 | exit(1); |
| 77 | } |
| 78 | if ((itf = fopen(tempMesg, "r")) == NULL) { |
| 79 | perror(tempMesg); |
| 80 | exit(1); |
| 81 | } |
| 82 | remove(tempMesg); |
| 83 | setptr(ibuf); |
| 84 | setmsize(msgCount); |
| 85 | fclose(ibuf); |
| 86 | sigret(sigs); |
| 87 | shudann = 1; |
| 88 | sawcom = 0; |
| 89 | return(0); |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Interpret user commands one by one. If standard input is not a tty, |
| 94 | * print no prompt. |
| 95 | */ |
| 96 | |
| 97 | int *msgvec; |
| 98 | |
| 99 | commands() |
| 100 | { |
| 101 | int prompt, firstsw, stop(); |
| 102 | register int n; |
| 103 | char linebuf[LINESIZE]; |
| 104 | int hangup(); |
| 105 | |
| 106 | if (rcvmode) { |
| 107 | if (sigset(SIGINT, SIG_IGN) != SIG_IGN) |
| 108 | sigset(SIGINT, stop); |
| 109 | if (sigset(SIGHUP, SIG_IGN) != SIG_IGN) |
| 110 | sigset(SIGHUP, hangup); |
| 111 | } |
| 112 | input = stdin; |
| 113 | prompt = 1; |
| 114 | if (!intty) |
| 115 | prompt = 0; |
| 116 | firstsw = 1; |
| 117 | for (;;) { |
| 118 | setexit(); |
| 119 | if (firstsw > 0) { |
| 120 | firstsw = 0; |
| 121 | source1(mailrc); |
| 122 | if (!nosrc) |
| 123 | source1(MASTER); |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * How's this for obscure: after we |
| 128 | * finish sourcing for the first time, |
| 129 | * go off and print the headers! |
| 130 | */ |
| 131 | |
| 132 | if (shudann && !sourcing) { |
| 133 | shudann = 0; |
| 134 | if (rcvmode) |
| 135 | announce(edit); |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Print the prompt, if needed. Clear out |
| 140 | * string space, and flush the output. |
| 141 | */ |
| 142 | |
| 143 | if (!rcvmode && !sourcing) |
| 144 | return; |
| 145 | top: |
| 146 | if (prompt && !sourcing) |
| 147 | printf("_\r"); |
| 148 | flush(); |
| 149 | sreset(); |
| 150 | |
| 151 | /* |
| 152 | * Read a line of commands from the current input |
| 153 | * and handle end of file specially. |
| 154 | */ |
| 155 | |
| 156 | n = 0; |
| 157 | for (;;) { |
| 158 | if (readline(input, &linebuf[n]) <= 0) { |
| 159 | if (n != 0) |
| 160 | break; |
| 161 | if (sourcing) { |
| 162 | unstack(); |
| 163 | goto more; |
| 164 | } |
| 165 | if (value("ignoreeof") != NOSTR && prompt) { |
| 166 | printf("Use \"quit\" to quit.\n"); |
| 167 | goto top; |
| 168 | } |
| 169 | if (!edit) |
| 170 | return; |
| 171 | edstop(); |
| 172 | return; |
| 173 | } |
| 174 | if ((n = strlen(linebuf)) == 0) |
| 175 | break; |
| 176 | n--; |
| 177 | if (linebuf[n] != '\\') |
| 178 | break; |
| 179 | linebuf[n++] = ' '; |
| 180 | } |
| 181 | if (execute(linebuf, 0)) |
| 182 | return; |
| 183 | more: ; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * Execute a single command. If the command executed |
| 189 | * is "quit," then return non-zero so that the caller |
| 190 | * will know to return back to main, if he cares. |
| 191 | * Contxt is non-zero if called while composing mail. |
| 192 | */ |
| 193 | |
| 194 | execute(linebuf, contxt) |
| 195 | char linebuf[]; |
| 196 | { |
| 197 | char word[LINESIZE]; |
| 198 | char *arglist[MAXARGC]; |
| 199 | struct cmd *com; |
| 200 | register char *cp, *cp2; |
| 201 | register int c; |
| 202 | int muvec[2]; |
| 203 | int edstop(), e; |
| 204 | |
| 205 | /* |
| 206 | * Strip the white space away from the beginning |
| 207 | * of the command, then scan out a word, which |
| 208 | * consists of anything except digits and white space. |
| 209 | * |
| 210 | * Handle ! escapes differently to get the correct |
| 211 | * lexical conventions. |
| 212 | */ |
| 213 | |
| 214 | cp = linebuf; |
| 215 | while (any(*cp, " \t")) |
| 216 | cp++; |
| 217 | if (*cp == '!') { |
| 218 | if (sourcing) { |
| 219 | printf("Can't \"!\" while sourcing\n"); |
| 220 | unstack(); |
| 221 | return(0); |
| 222 | } |
| 223 | shell(cp+1); |
| 224 | return(0); |
| 225 | } |
| 226 | cp2 = word; |
| 227 | while (*cp && !any(*cp, " \t0123456789$^.:/-+*'\"")) |
| 228 | *cp2++ = *cp++; |
| 229 | *cp2 = '\0'; |
| 230 | |
| 231 | /* |
| 232 | * Look up the command; if not found, bitch. |
| 233 | * Normally, a blank command would map to the |
| 234 | * first command in the table; while sourcing, |
| 235 | * however, we ignore blank lines to eliminate |
| 236 | * confusion. |
| 237 | */ |
| 238 | |
| 239 | if (sourcing && equal(word, "")) |
| 240 | return(0); |
| 241 | com = lex(word); |
| 242 | if (com == NONE) { |
| 243 | printf("What?\n"); |
| 244 | if (sourcing) |
| 245 | unstack(); |
| 246 | return(0); |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * See if we should execute the command -- if a conditional |
| 251 | * we always execute it, otherwise, check the state of cond. |
| 252 | */ |
| 253 | |
| 254 | if ((com->c_argtype & F) == 0) |
| 255 | if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode) |
| 256 | return(0); |
| 257 | |
| 258 | /* |
| 259 | * Special case so that quit causes a return to |
| 260 | * main, who will call the quit code directly. |
| 261 | * If we are in a source file, just unstack. |
| 262 | */ |
| 263 | |
| 264 | if (com->c_func == edstop && sourcing) { |
| 265 | unstack(); |
| 266 | return(0); |
| 267 | } |
| 268 | if (!edit && com->c_func == edstop) { |
| 269 | sigset(SIGINT, SIG_IGN); |
| 270 | return(1); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Process the arguments to the command, depending |
| 275 | * on the type he expects. Default to an error. |
| 276 | * If we are sourcing an interactive command, it's |
| 277 | * an error. |
| 278 | */ |
| 279 | |
| 280 | if (!rcvmode && (com->c_argtype & M) == 0) { |
| 281 | printf("May not execute \"%s\" while sending\n", |
| 282 | com->c_name); |
| 283 | if (sourcing) |
| 284 | unstack(); |
| 285 | return(0); |
| 286 | } |
| 287 | if (sourcing && com->c_argtype & I) { |
| 288 | printf("May not execute \"%s\" while sourcing\n", |
| 289 | com->c_name); |
| 290 | unstack(); |
| 291 | return(0); |
| 292 | } |
| 293 | if (readonly && com->c_argtype & W) { |
| 294 | printf("May not execute \"%s\" -- message file is read only\n", |
| 295 | com->c_name); |
| 296 | if (sourcing) |
| 297 | unstack(); |
| 298 | return(0); |
| 299 | } |
| 300 | if (contxt && com->c_argtype & R) { |
| 301 | printf("Cannot recursively invoke \"%s\"\n", com->c_name); |
| 302 | return(0); |
| 303 | } |
| 304 | e = 1; |
| 305 | switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { |
| 306 | case MSGLIST: |
| 307 | /* |
| 308 | * A message list defaulting to nearest forward |
| 309 | * legal message. |
| 310 | */ |
| 311 | if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) |
| 312 | break; |
| 313 | if (c == 0) { |
| 314 | *msgvec = first(com->c_msgflag, |
| 315 | com->c_msgmask); |
| 316 | msgvec[1] = NULL; |
| 317 | } |
| 318 | if (*msgvec == NULL) { |
| 319 | printf("No applicable messages\n"); |
| 320 | break; |
| 321 | } |
| 322 | e = (*com->c_func)(msgvec); |
| 323 | break; |
| 324 | |
| 325 | case NDMLIST: |
| 326 | /* |
| 327 | * A message list with no defaults, but no error |
| 328 | * if none exist. |
| 329 | */ |
| 330 | if (getmsglist(cp, msgvec, com->c_msgflag) < 0) |
| 331 | break; |
| 332 | e = (*com->c_func)(msgvec); |
| 333 | break; |
| 334 | |
| 335 | case STRLIST: |
| 336 | /* |
| 337 | * Just the straight string, with |
| 338 | * leading blanks removed. |
| 339 | */ |
| 340 | while (any(*cp, " \t")) |
| 341 | cp++; |
| 342 | e = (*com->c_func)(cp); |
| 343 | break; |
| 344 | |
| 345 | case RAWLIST: |
| 346 | /* |
| 347 | * A vector of strings, in shell style. |
| 348 | */ |
| 349 | if ((c = getrawlist(cp, arglist)) < 0) |
| 350 | break; |
| 351 | if (c < com->c_minargs) { |
| 352 | printf("%s requires at least %d arg(s)\n", |
| 353 | com->c_name, com->c_minargs); |
| 354 | break; |
| 355 | } |
| 356 | if (c > com->c_maxargs) { |
| 357 | printf("%s takes no more than %d arg(s)\n", |
| 358 | com->c_name, com->c_maxargs); |
| 359 | break; |
| 360 | } |
| 361 | e = (*com->c_func)(arglist); |
| 362 | break; |
| 363 | |
| 364 | case NOLIST: |
| 365 | /* |
| 366 | * Just the constant zero, for exiting, |
| 367 | * eg. |
| 368 | */ |
| 369 | e = (*com->c_func)(0); |
| 370 | break; |
| 371 | |
| 372 | default: |
| 373 | panic("Unknown argtype"); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Exit the current source file on |
| 378 | * error. |
| 379 | */ |
| 380 | |
| 381 | if (e && sourcing) |
| 382 | unstack(); |
| 383 | if (com->c_func == edstop) |
| 384 | return(1); |
| 385 | if (value("autoprint") != NOSTR && com->c_argtype & P) |
| 386 | if ((dot->m_flag & MDELETED) == 0) { |
| 387 | muvec[0] = dot - &message[0] + 1; |
| 388 | muvec[1] = 0; |
| 389 | type(muvec); |
| 390 | } |
| 391 | if (!sourcing && (com->c_argtype & T) == 0) |
| 392 | sawcom = 1; |
| 393 | return(0); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Branch here on hangup signal and simulate quit. |
| 398 | */ |
| 399 | hangup() |
| 400 | { |
| 401 | int (*sigs[3])(); |
| 402 | |
| 403 | sigsave(sigs); |
| 404 | if (edit) { |
| 405 | if (setexit()) |
| 406 | exit(0); |
| 407 | edstop(); |
| 408 | } |
| 409 | else |
| 410 | quit(); |
| 411 | exit(0); |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * Set the size of the message vector used to construct argument |
| 416 | * lists to message list functions. |
| 417 | */ |
| 418 | |
| 419 | setmsize(sz) |
| 420 | { |
| 421 | |
| 422 | if (msgvec != (int *) 0) |
| 423 | cfree(msgvec); |
| 424 | msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Find the correct command in the command table corresponding |
| 429 | * to the passed command "word" |
| 430 | */ |
| 431 | |
| 432 | struct cmd * |
| 433 | lex(word) |
| 434 | char word[]; |
| 435 | { |
| 436 | register struct cmd *cp; |
| 437 | extern struct cmd cmdtab[]; |
| 438 | |
| 439 | for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) |
| 440 | if (isprefix(word, cp->c_name)) |
| 441 | return(cp); |
| 442 | return(NONE); |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Determine if as1 is a valid prefix of as2. |
| 447 | * Return true if yep. |
| 448 | */ |
| 449 | |
| 450 | isprefix(as1, as2) |
| 451 | char *as1, *as2; |
| 452 | { |
| 453 | register char *s1, *s2; |
| 454 | |
| 455 | s1 = as1; |
| 456 | s2 = as2; |
| 457 | while (*s1++ == *s2) |
| 458 | if (*s2++ == '\0') |
| 459 | return(1); |
| 460 | return(*--s1 == '\0'); |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * The following gets called on receipt of a rubout. This is |
| 465 | * to abort printout of a command, mainly. |
| 466 | * Dispatching here when command() is inactive crashes rcv. |
| 467 | * Close all open files except 0, 1, 2, and the temporary. |
| 468 | * The special call to getuserid() is needed so it won't get |
| 469 | * annoyed about losing its open file. |
| 470 | * Also, unstack all source files. |
| 471 | */ |
| 472 | |
| 473 | int inithdr; /* am printing startup headers */ |
| 474 | |
| 475 | stop(s) |
| 476 | { |
| 477 | register FILE *fp; |
| 478 | |
| 479 | noreset = 0; |
| 480 | if (!inithdr) |
| 481 | sawcom++; |
| 482 | inithdr = 0; |
| 483 | while (sourcing) |
| 484 | unstack(); |
| 485 | getuserid((char *) -1); |
| 486 | for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) { |
| 487 | if (fp == stdin || fp == stdout) |
| 488 | continue; |
| 489 | if (fp == itf || fp == otf) |
| 490 | continue; |
| 491 | if (fp == stderr) |
| 492 | continue; |
| 493 | if (fp == pipef) { |
| 494 | pclose(pipef); |
| 495 | pipef = NULL; |
| 496 | continue; |
| 497 | } |
| 498 | fclose(fp); |
| 499 | } |
| 500 | if (image >= 0) { |
| 501 | close(image); |
| 502 | image = -1; |
| 503 | } |
| 504 | clrbuf(stdout); |
| 505 | printf("Interrupt\n"); |
| 506 | sigrelse(s); |
| 507 | reset(0); |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Announce the presence of the current Mail version, |
| 512 | * give the message count, and print a header listing. |
| 513 | */ |
| 514 | |
| 515 | char *greeting = "Mail version 2.0 %s. Type ? for help.\n"; |
| 516 | |
| 517 | announce(pr) |
| 518 | { |
| 519 | int vec[2], mdot; |
| 520 | extern char *version; |
| 521 | |
| 522 | mdot = newfileinfo(); |
| 523 | vec[0] = mdot; |
| 524 | vec[1] = 0; |
| 525 | if (pr && value("quiet") == NOSTR) |
| 526 | printf(greeting, version); |
| 527 | dot = &message[mdot - 1]; |
| 528 | if (msgCount > 0 && !noheader) { |
| 529 | inithdr++; |
| 530 | headers(vec); |
| 531 | inithdr = 0; |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Announce information about the file we are editing. |
| 537 | * Return a likely place to set dot. |
| 538 | */ |
| 539 | |
| 540 | newfileinfo() |
| 541 | { |
| 542 | register struct message *mp; |
| 543 | register int u, n, mdot; |
| 544 | |
| 545 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 546 | if (mp->m_flag & MNEW) |
| 547 | break; |
| 548 | if (mp >= &message[msgCount]) |
| 549 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 550 | if ((mp->m_flag & MREAD) == 0) |
| 551 | break; |
| 552 | if (mp < &message[msgCount]) |
| 553 | mdot = mp - &message[0] + 1; |
| 554 | else |
| 555 | mdot = 1; |
| 556 | for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { |
| 557 | if (mp->m_flag & MNEW) |
| 558 | n++; |
| 559 | if ((mp->m_flag & MREAD) == 0) |
| 560 | u++; |
| 561 | } |
| 562 | printf("\"%s\": ", mailname); |
| 563 | if (msgCount == 1) |
| 564 | printf("1 message"); |
| 565 | else |
| 566 | printf("%d messages", msgCount); |
| 567 | if (n > 0) |
| 568 | printf(" %d new", n); |
| 569 | if (u-n > 0) |
| 570 | printf(" %d unread", u); |
| 571 | if (readonly) |
| 572 | printf(" [Read only]"); |
| 573 | printf("\n"); |
| 574 | return(mdot); |
| 575 | } |
| 576 | |
| 577 | strace() {} |
| 578 | |
| 579 | /* |
| 580 | * Print the current version number. |
| 581 | */ |
| 582 | |
| 583 | pversion(e) |
| 584 | { |
| 585 | printf(greeting, version); |
| 586 | return(0); |
| 587 | } |