1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #ifdef notdef 14 static char sccsid[] = "@(#)lex.c 5.8 (Berkeley) 04/12/88"; 15 #endif /* notdef */ 16 17 #include "rcv.h" 18 #include <sys/stat.h> 19 #include <errno.h> 20 21 /* 22 * Mail -- a mail program 23 * 24 * Lexical processing of commands. 25 */ 26 27 char *prompt = "& "; 28 29 /* 30 * Set up editing on the given file name. 31 * If isedit is true, we are considered to be editing the file, 32 * otherwise we are reading our mail which has signficance for 33 * mbox and so forth. 34 */ 35 36 setfile(name, isedit) 37 char *name; 38 { 39 FILE *ibuf; 40 int i; 41 struct stat stb; 42 static int shudclob; 43 static char efile[128]; 44 extern char tempMesg[]; 45 extern int errno; 46 47 if ((ibuf = fopen(name, "r")) == NULL) 48 return(-1); 49 50 if (fstat(fileno(ibuf), &stb) < 0) { 51 fclose(ibuf); 52 return (-1); 53 } 54 55 switch (stb.st_mode & S_IFMT) { 56 case S_IFDIR: 57 fclose(ibuf); 58 errno = EISDIR; 59 return (-1); 60 61 case S_IFREG: 62 break; 63 64 default: 65 fclose(ibuf); 66 errno = EINVAL; 67 return (-1); 68 } 69 70 if (!edit && stb.st_size == 0) { 71 fclose(ibuf); 72 return(-1); 73 } 74 75 /* 76 * Looks like all will be well. We must now relinquish our 77 * hold on the current set of stuff. Must hold signals 78 * while we are reading the new file, else we will ruin 79 * the message[] data structure. 80 */ 81 82 holdsigs(); 83 if (shudclob) { 84 if (edit) 85 edstop(); 86 else 87 quit(); 88 } 89 90 /* 91 * Copy the messages into /tmp 92 * and set pointers. 93 */ 94 95 readonly = 0; 96 if ((i = open(name, 1)) < 0) 97 readonly++; 98 else 99 close(i); 100 if (shudclob) { 101 fclose(itf); 102 fclose(otf); 103 } 104 shudclob = 1; 105 edit = isedit; 106 strncpy(efile, name, 128); 107 editfile = efile; 108 if (name != mailname) 109 strcpy(mailname, name); 110 mailsize = fsize(ibuf); 111 if ((otf = fopen(tempMesg, "w")) == NULL) { 112 perror(tempMesg); 113 exit(1); 114 } 115 if ((itf = fopen(tempMesg, "r")) == NULL) { 116 perror(tempMesg); 117 exit(1); 118 } 119 remove(tempMesg); 120 setptr(ibuf); 121 setmsize(msgCount); 122 fclose(ibuf); 123 relsesigs(); 124 sawcom = 0; 125 return(0); 126 } 127 128 /* 129 * Interpret user commands one by one. If standard input is not a tty, 130 * print no prompt. 131 */ 132 133 int *msgvec; 134 jmp_buf commjmp; 135 136 commands() 137 { 138 int eofloop, shudprompt, stop(); 139 register int n; 140 char linebuf[LINESIZE]; 141 int hangup(), contin(); 142 143 signal(SIGCONT, SIG_DFL); 144 if (rcvmode && !sourcing) { 145 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 146 signal(SIGINT, stop); 147 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 148 signal(SIGHUP, hangup); 149 } 150 shudprompt = intty && !sourcing; 151 for (;;) { 152 setexit(); 153 154 /* 155 * Print the prompt, if needed. Clear out 156 * string space, and flush the output. 157 */ 158 159 if (!rcvmode && !sourcing) 160 return; 161 eofloop = 0; 162 top: 163 if (shudprompt) { 164 setjmp(commjmp); 165 signal(SIGCONT, contin); 166 printf(prompt); 167 } 168 fflush(stdout); 169 sreset(); 170 171 /* 172 * Read a line of commands from the current input 173 * and handle end of file specially. 174 */ 175 176 n = 0; 177 for (;;) { 178 if (readline(input, &linebuf[n]) < 0) { 179 if (n != 0) 180 break; 181 if (loading) 182 return; 183 if (sourcing) { 184 unstack(); 185 goto more; 186 } 187 if (value("ignoreeof") != NOSTR && shudprompt) { 188 if (++eofloop < 25) { 189 printf("Use \"quit\" to quit.\n"); 190 goto top; 191 } 192 } 193 if (edit) 194 edstop(); 195 return; 196 } 197 if ((n = strlen(linebuf)) == 0) 198 break; 199 n--; 200 if (linebuf[n] != '\\') 201 break; 202 linebuf[n++] = ' '; 203 } 204 signal(SIGCONT, SIG_DFL); 205 if (execute(linebuf, 0)) 206 return; 207 more: ; 208 } 209 } 210 211 /* 212 * Execute a single command. If the command executed 213 * is "quit," then return non-zero so that the caller 214 * will know to return back to main, if he cares. 215 * Contxt is non-zero if called while composing mail. 216 */ 217 218 execute(linebuf, contxt) 219 char linebuf[]; 220 { 221 char word[LINESIZE]; 222 char *arglist[MAXARGC]; 223 struct cmd *com; 224 register char *cp, *cp2; 225 register int c; 226 int muvec[2]; 227 int edstop(), e; 228 229 /* 230 * Strip the white space away from the beginning 231 * of the command, then scan out a word, which 232 * consists of anything except digits and white space. 233 * 234 * Handle ! escapes differently to get the correct 235 * lexical conventions. 236 */ 237 238 for (cp = linebuf; isspace(*cp); cp++) 239 ; 240 if (*cp == '!') { 241 if (sourcing) { 242 printf("Can't \"!\" while sourcing\n"); 243 unstack(); 244 return(0); 245 } 246 shell(cp+1); 247 return(0); 248 } 249 cp2 = word; 250 while (*cp && !any(*cp, " \t0123456789$^.:/-+*'\"")) 251 *cp2++ = *cp++; 252 *cp2 = '\0'; 253 254 /* 255 * Look up the command; if not found, bitch. 256 * Normally, a blank command would map to the 257 * first command in the table; while sourcing, 258 * however, we ignore blank lines to eliminate 259 * confusion. 260 */ 261 262 if (sourcing && *word == '\0') 263 return(0); 264 com = lex(word); 265 if (com == NONE) { 266 printf("Unknown command: \"%s\"\n", word); 267 if (loading) 268 return(1); 269 if (sourcing) 270 unstack(); 271 return(0); 272 } 273 274 /* 275 * See if we should execute the command -- if a conditional 276 * we always execute it, otherwise, check the state of cond. 277 */ 278 279 if ((com->c_argtype & F) == 0) 280 if (cond == CRCV && !rcvmode || cond == CSEND && rcvmode) 281 return(0); 282 283 /* 284 * Special case so that quit causes a return to 285 * main, who will call the quit code directly. 286 * If we are in a source file, just unstack. 287 */ 288 289 if (com->c_func == edstop && sourcing) { 290 if (loading) 291 return(1); 292 unstack(); 293 return(0); 294 } 295 if (!edit && com->c_func == edstop) { 296 signal(SIGINT, SIG_IGN); 297 return(1); 298 } 299 300 /* 301 * Process the arguments to the command, depending 302 * on the type he expects. Default to an error. 303 * If we are sourcing an interactive command, it's 304 * an error. 305 */ 306 307 if (!rcvmode && (com->c_argtype & M) == 0) { 308 printf("May not execute \"%s\" while sending\n", 309 com->c_name); 310 if (loading) 311 return(1); 312 if (sourcing) 313 unstack(); 314 return(0); 315 } 316 if (sourcing && com->c_argtype & I) { 317 printf("May not execute \"%s\" while sourcing\n", 318 com->c_name); 319 if (loading) 320 return(1); 321 unstack(); 322 return(0); 323 } 324 if (readonly && com->c_argtype & W) { 325 printf("May not execute \"%s\" -- message file is read only\n", 326 com->c_name); 327 if (loading) 328 return(1); 329 if (sourcing) 330 unstack(); 331 return(0); 332 } 333 if (contxt && com->c_argtype & R) { 334 printf("Cannot recursively invoke \"%s\"\n", com->c_name); 335 return(0); 336 } 337 e = 1; 338 switch (com->c_argtype & ~(F|P|I|M|T|W|R)) { 339 case MSGLIST: 340 /* 341 * A message list defaulting to nearest forward 342 * legal message. 343 */ 344 if (msgvec == 0) { 345 printf("Illegal use of \"message list\"\n"); 346 return(-1); 347 } 348 if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) 349 break; 350 if (c == 0) { 351 *msgvec = first(com->c_msgflag, 352 com->c_msgmask); 353 msgvec[1] = NULL; 354 } 355 if (*msgvec == NULL) { 356 printf("No applicable messages\n"); 357 break; 358 } 359 e = (*com->c_func)(msgvec); 360 break; 361 362 case NDMLIST: 363 /* 364 * A message list with no defaults, but no error 365 * if none exist. 366 */ 367 if (msgvec == 0) { 368 printf("Illegal use of \"message list\"\n"); 369 return(-1); 370 } 371 if (getmsglist(cp, msgvec, com->c_msgflag) < 0) 372 break; 373 e = (*com->c_func)(msgvec); 374 break; 375 376 case STRLIST: 377 /* 378 * Just the straight string, with 379 * leading blanks removed. 380 */ 381 while (isspace(*cp)) 382 cp++; 383 e = (*com->c_func)(cp); 384 break; 385 386 case RAWLIST: 387 /* 388 * A vector of strings, in shell style. 389 */ 390 if ((c = getrawlist(cp, arglist, 391 sizeof arglist / sizeof *arglist)) < 0) 392 break; 393 if (c < com->c_minargs) { 394 printf("%s requires at least %d arg(s)\n", 395 com->c_name, com->c_minargs); 396 break; 397 } 398 if (c > com->c_maxargs) { 399 printf("%s takes no more than %d arg(s)\n", 400 com->c_name, com->c_maxargs); 401 break; 402 } 403 e = (*com->c_func)(arglist); 404 break; 405 406 case NOLIST: 407 /* 408 * Just the constant zero, for exiting, 409 * eg. 410 */ 411 e = (*com->c_func)(0); 412 break; 413 414 default: 415 panic("Unknown argtype"); 416 } 417 418 /* 419 * Exit the current source file on 420 * error. 421 */ 422 423 if (e && loading) 424 return(1); 425 if (e && sourcing) 426 unstack(); 427 if (com->c_func == edstop) 428 return(1); 429 if (value("autoprint") != NOSTR && com->c_argtype & P) 430 if ((dot->m_flag & MDELETED) == 0) { 431 muvec[0] = dot - &message[0] + 1; 432 muvec[1] = 0; 433 type(muvec); 434 } 435 if (!sourcing && (com->c_argtype & T) == 0) 436 sawcom = 1; 437 return(0); 438 } 439 440 /* 441 * When we wake up after ^Z, reprint the prompt. 442 */ 443 /*ARGSUSED*/ 444 contin(s) 445 { 446 447 longjmp(commjmp, 1); 448 } 449 450 /* 451 * Branch here on hangup signal and simulate "exit". 452 */ 453 /*ARGSUSED*/ 454 hangup(s) 455 { 456 457 /* nothing to do? */ 458 exit(0); 459 } 460 461 /* 462 * Set the size of the message vector used to construct argument 463 * lists to message list functions. 464 */ 465 466 setmsize(sz) 467 { 468 469 if (msgvec != 0) 470 cfree((char *) msgvec); 471 msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); 472 } 473 474 /* 475 * Find the correct command in the command table corresponding 476 * to the passed command "word" 477 */ 478 479 struct cmd * 480 lex(word) 481 char word[]; 482 { 483 register struct cmd *cp; 484 extern struct cmd cmdtab[]; 485 486 for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) 487 if (isprefix(word, cp->c_name)) 488 return(cp); 489 return(NONE); 490 } 491 492 /* 493 * Determine if as1 is a valid prefix of as2. 494 * Return true if yep. 495 */ 496 497 isprefix(as1, as2) 498 char *as1, *as2; 499 { 500 register char *s1, *s2; 501 502 s1 = as1; 503 s2 = as2; 504 while (*s1++ == *s2) 505 if (*s2++ == '\0') 506 return(1); 507 return(*--s1 == '\0'); 508 } 509 510 /* 511 * The following gets called on receipt of an interrupt. This is 512 * to abort printout of a command, mainly. 513 * Dispatching here when command() is inactive crashes rcv. 514 * Close all open files except 0, 1, 2, and the temporary. 515 * Also, unstack all source files. 516 */ 517 518 int inithdr; /* am printing startup headers */ 519 520 #ifdef _NFILE 521 static 522 _fwalk(function) 523 register int (*function)(); 524 { 525 register FILE *iop; 526 527 for (iop = _iob; iop < _iob + _NFILE; iop++) 528 (*function)(iop); 529 } 530 #endif 531 532 static 533 xclose(iop) 534 register FILE *iop; 535 { 536 if (iop == stdin || iop == stdout || 537 iop == stderr || iop == itf || iop == otf) 538 return; 539 540 if (iop != pipef) 541 fclose(iop); 542 else { 543 pclose(pipef); 544 pipef = NULL; 545 } 546 } 547 548 /*ARGSUSED*/ 549 stop(s) 550 { 551 552 noreset = 0; 553 if (!inithdr) 554 sawcom++; 555 inithdr = 0; 556 while (sourcing) 557 unstack(); 558 559 /* 560 * Walk through all the open FILEs, applying xclose() to them 561 */ 562 _fwalk(xclose); 563 564 if (image >= 0) { 565 close(image); 566 image = -1; 567 } 568 fprintf(stderr, "Interrupt\n"); 569 reset(0); 570 } 571 572 /* 573 * Announce the presence of the current Mail version, 574 * give the message count, and print a header listing. 575 */ 576 577 char *greeting = "Mail version %s. Type ? for help.\n"; 578 579 announce(pr) 580 { 581 int vec[2], mdot; 582 extern char *version; 583 584 if (pr && value("quiet") == NOSTR) 585 printf(greeting, version); 586 mdot = newfileinfo(); 587 vec[0] = mdot; 588 vec[1] = 0; 589 dot = &message[mdot - 1]; 590 if (msgCount > 0 && !noheader) { 591 inithdr++; 592 headers(vec); 593 inithdr = 0; 594 } 595 } 596 597 /* 598 * Announce information about the file we are editing. 599 * Return a likely place to set dot. 600 */ 601 newfileinfo() 602 { 603 register struct message *mp; 604 register int u, n, mdot, d, s; 605 char fname[BUFSIZ], zname[BUFSIZ], *ename; 606 607 for (mp = &message[0]; mp < &message[msgCount]; mp++) 608 if (mp->m_flag & MNEW) 609 break; 610 if (mp >= &message[msgCount]) 611 for (mp = &message[0]; mp < &message[msgCount]; mp++) 612 if ((mp->m_flag & MREAD) == 0) 613 break; 614 if (mp < &message[msgCount]) 615 mdot = mp - &message[0] + 1; 616 else 617 mdot = 1; 618 s = d = 0; 619 for (mp = &message[0], n = 0, u = 0; mp < &message[msgCount]; mp++) { 620 if (mp->m_flag & MNEW) 621 n++; 622 if ((mp->m_flag & MREAD) == 0) 623 u++; 624 if (mp->m_flag & MDELETED) 625 d++; 626 if (mp->m_flag & MSAVED) 627 s++; 628 } 629 ename = mailname; 630 if (getfold(fname) >= 0) { 631 strcat(fname, "/"); 632 if (strncmp(fname, mailname, strlen(fname)) == 0) { 633 sprintf(zname, "+%s", mailname + strlen(fname)); 634 ename = zname; 635 } 636 } 637 printf("\"%s\": ", ename); 638 if (msgCount == 1) 639 printf("1 message"); 640 else 641 printf("%d messages", msgCount); 642 if (n > 0) 643 printf(" %d new", n); 644 if (u-n > 0) 645 printf(" %d unread", u); 646 if (d > 0) 647 printf(" %d deleted", d); 648 if (s > 0) 649 printf(" %d saved", s); 650 if (readonly) 651 printf(" [Read only]"); 652 printf("\n"); 653 return(mdot); 654 } 655 656 /* 657 * Print the current version number. 658 */ 659 660 /*ARGSUSED*/ 661 pversion(e) 662 { 663 extern char *version; 664 665 printf("Version %s\n", version); 666 return(0); 667 } 668 669 /* 670 * Load a file of user definitions. 671 */ 672 load(name) 673 char *name; 674 { 675 register FILE *in, *oldin; 676 677 if ((in = fopen(name, "r")) == NULL) 678 return; 679 oldin = input; 680 input = in; 681 loading = 1; 682 sourcing = 1; 683 commands(); 684 loading = 0; 685 sourcing = 0; 686 input = oldin; 687 fclose(in); 688 } 689