| 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 1.7 %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[2])(); |
| 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 | for (i = SIGINT; i <= SIGQUIT; i++) |
| 46 | sigs[i - SIGINT] = signal(i, SIG_IGN); |
| 47 | if (shudclob) { |
| 48 | if (edit) |
| 49 | edstop(); |
| 50 | else |
| 51 | quit(); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Copy the messages into /tmp |
| 56 | * and set pointers. |
| 57 | */ |
| 58 | |
| 59 | readonly = 0; |
| 60 | if ((i = open(name, 1)) < 0) |
| 61 | readonly++; |
| 62 | else |
| 63 | close(i); |
| 64 | if (shudclob) { |
| 65 | fclose(itf); |
| 66 | fclose(otf); |
| 67 | } |
| 68 | shudclob = 1; |
| 69 | edit = isedit; |
| 70 | strncpy(efile, name, 128); |
| 71 | editfile = efile; |
| 72 | mailsize = fsize(ibuf); |
| 73 | if ((otf = fopen(tempMesg, "w")) == NULL) { |
| 74 | perror(tempMesg); |
| 75 | exit(1); |
| 76 | } |
| 77 | if ((itf = fopen(tempMesg, "r")) == NULL) { |
| 78 | perror(tempMesg); |
| 79 | exit(1); |
| 80 | } |
| 81 | remove(tempMesg); |
| 82 | setptr(ibuf); |
| 83 | setmsize(msgCount); |
| 84 | fclose(ibuf); |
| 85 | for (i = SIGINT; i <= SIGQUIT; i++) |
| 86 | signal(i, sigs[i - SIGINT]); |
| 87 | printf("%s: ", name); |
| 88 | shudann = 1; |
| 89 | sawcom = 0; |
| 90 | return(0); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Interpret user commands one by one. If standard input is not a tty, |
| 95 | * print no prompt. |
| 96 | */ |
| 97 | |
| 98 | int *msgvec; |
| 99 | |
| 100 | commands() |
| 101 | { |
| 102 | int prompt, firstsw, stop(); |
| 103 | register int n; |
| 104 | char linebuf[LINESIZE]; |
| 105 | |
| 106 | if (rcvmode) |
| 107 | if (signal(SIGINT, SIG_IGN) == SIG_DFL) |
| 108 | signal(SIGINT, stop); |
| 109 | input = stdin; |
| 110 | prompt = 1; |
| 111 | if (!intty) |
| 112 | prompt = 0; |
| 113 | firstsw = 1; |
| 114 | for (;;) { |
| 115 | setexit(); |
| 116 | if (firstsw > 0) { |
| 117 | firstsw = 0; |
| 118 | source1(mailrc); |
| 119 | if (!nosrc) |
| 120 | source1(MASTER); |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * How's this for obscure: after we |
| 125 | * finish sourcing for the first time, |
| 126 | * go off and print the headers! |
| 127 | */ |
| 128 | |
| 129 | if (shudann && !sourcing) { |
| 130 | shudann = 0; |
| 131 | if (rcvmode) |
| 132 | announce(edit); |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Print the prompt, if needed. Clear out |
| 137 | * string space, and flush the output. |
| 138 | */ |
| 139 | |
| 140 | if (!rcvmode && !sourcing) |
| 141 | return; |
| 142 | top: |
| 143 | if (prompt && !sourcing) |
| 144 | printf("_\r"); |
| 145 | flush(); |
| 146 | sreset(); |
| 147 | |
| 148 | /* |
| 149 | * Read a line of commands from the current input |
| 150 | * and handle end of file specially. |
| 151 | */ |
| 152 | |
| 153 | n = 0; |
| 154 | for (;;) { |
| 155 | if (readline(input, &linebuf[n]) <= 0) { |
| 156 | if (n != 0) |
| 157 | break; |
| 158 | if (sourcing) { |
| 159 | unstack(); |
| 160 | goto more; |
| 161 | } |
| 162 | if (value("ignoreeof") != NOSTR && prompt) { |
| 163 | printf("Use \"quit\" to quit.\n"); |
| 164 | goto top; |
| 165 | } |
| 166 | if (!edit) { |
| 167 | signal(SIGINT, SIG_IGN); |
| 168 | return; |
| 169 | } |
| 170 | edstop(); |
| 171 | return; |
| 172 | } |
| 173 | if ((n = strlen(linebuf)) == 0) |
| 174 | break; |
| 175 | n--; |
| 176 | if (linebuf[n] != '\\') |
| 177 | break; |
| 178 | linebuf[n++] = ' '; |
| 179 | } |
| 180 | if (execute(linebuf)) |
| 181 | return; |
| 182 | more: ; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Execute a single command. If the command executed |
| 188 | * is "quit," then return non-zero so that the caller |
| 189 | * will know to return back to main, if he cares. |
| 190 | */ |
| 191 | |
| 192 | execute(linebuf) |
| 193 | char linebuf[]; |
| 194 | { |
| 195 | char word[LINESIZE]; |
| 196 | char *arglist[MAXARGC]; |
| 197 | struct cmd *com; |
| 198 | register char *cp, *cp2; |
| 199 | register int c; |
| 200 | int muvec[2]; |
| 201 | int edstop(), e; |
| 202 | |
| 203 | /* |
| 204 | * Strip the white space away from the beginning |
| 205 | * of the command, then scan out a word, which |
| 206 | * consists of anything except digits and white space. |
| 207 | * |
| 208 | * Handle ! escapes differently to get the correct |
| 209 | * lexical conventions. |
| 210 | */ |
| 211 | |
| 212 | cp = linebuf; |
| 213 | while (any(*cp, " \t")) |
| 214 | cp++; |
| 215 | if (*cp == '!') { |
| 216 | if (sourcing) { |
| 217 | printf("Can't \"!\" while sourcing\n"); |
| 218 | unstack(); |
| 219 | return(0); |
| 220 | } |
| 221 | shell(cp+1); |
| 222 | return(0); |
| 223 | } |
| 224 | cp2 = word; |
| 225 | while (*cp && !any(*cp, " \t0123456789$^./-+*'\"")) |
| 226 | *cp2++ = *cp++; |
| 227 | *cp2 = '\0'; |
| 228 | |
| 229 | /* |
| 230 | * Look up the command; if not found, bitch. |
| 231 | * Normally, a blank command would map to the |
| 232 | * first command in the table; while sourcing, |
| 233 | * however, we ignore blank lines to eliminate |
| 234 | * confusion. |
| 235 | */ |
| 236 | |
| 237 | if (sourcing && equal(word, "")) |
| 238 | return(0); |
| 239 | com = lex(word); |
| 240 | if (com == NONE) { |
| 241 | printf("What?\n"); |
| 242 | if (sourcing) |
| 243 | unstack(); |
| 244 | return(0); |
| 245 | } |
| 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 | unstack(); |
| 255 | return(0); |
| 256 | } |
| 257 | if (!edit && com->c_func == edstop) { |
| 258 | signal(SIGINT, SIG_IGN); |
| 259 | return(1); |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Process the arguments to the command, depending |
| 264 | * on the type he expects. Default to an error. |
| 265 | * If we are sourcing an interactive command, it's |
| 266 | * an error. |
| 267 | */ |
| 268 | |
| 269 | if (!rcvmode && (com->c_argtype & M) == 0) { |
| 270 | printf("May not execute \"%s\" while sending\n", |
| 271 | com->c_name); |
| 272 | unstack(); |
| 273 | return(0); |
| 274 | } |
| 275 | if (sourcing && com->c_argtype & I) { |
| 276 | printf("May not execute \"%s\" while sourcing\n", |
| 277 | com->c_name); |
| 278 | unstack(); |
| 279 | return(0); |
| 280 | } |
| 281 | if (readonly && com->c_argtype & W) { |
| 282 | printf("May not execute \"%s\" -- message file is read only\n", |
| 283 | com->c_name); |
| 284 | if (sourcing) |
| 285 | unstack(); |
| 286 | return(0); |
| 287 | } |
| 288 | e = 1; |
| 289 | switch (com->c_argtype & ~(P|I|M|W)) { |
| 290 | case MSGLIST: |
| 291 | /* |
| 292 | * A message list defaulting to nearest forward |
| 293 | * legal message. |
| 294 | */ |
| 295 | if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) |
| 296 | break; |
| 297 | if (c == 0) { |
| 298 | *msgvec = first(com->c_msgflag, |
| 299 | com->c_msgmask); |
| 300 | msgvec[1] = NULL; |
| 301 | } |
| 302 | if (*msgvec == NULL) { |
| 303 | printf("No applicable messages\n"); |
| 304 | break; |
| 305 | } |
| 306 | e = (*com->c_func)(msgvec); |
| 307 | break; |
| 308 | |
| 309 | case NDMLIST: |
| 310 | /* |
| 311 | * A message list with no defaults, but no error |
| 312 | * if none exist. |
| 313 | */ |
| 314 | if (getmsglist(cp, msgvec, com->c_msgflag) < 0) |
| 315 | break; |
| 316 | e = (*com->c_func)(msgvec); |
| 317 | break; |
| 318 | |
| 319 | case STRLIST: |
| 320 | /* |
| 321 | * Just the straight string, with |
| 322 | * leading blanks removed. |
| 323 | */ |
| 324 | while (any(*cp, " \t")) |
| 325 | cp++; |
| 326 | e = (*com->c_func)(cp); |
| 327 | break; |
| 328 | |
| 329 | case RAWLIST: |
| 330 | /* |
| 331 | * A vector of strings, in shell style. |
| 332 | */ |
| 333 | if ((c = getrawlist(cp, arglist)) < 0) |
| 334 | break; |
| 335 | if (c < com->c_minargs) { |
| 336 | printf("%s requires at least %d arg(s)\n", |
| 337 | com->c_name, com->c_minargs); |
| 338 | break; |
| 339 | } |
| 340 | if (c > com->c_maxargs) { |
| 341 | printf("%s takes no more than %d arg(s)\n", |
| 342 | com->c_name, com->c_maxargs); |
| 343 | break; |
| 344 | } |
| 345 | e = (*com->c_func)(arglist); |
| 346 | break; |
| 347 | |
| 348 | case NOLIST: |
| 349 | /* |
| 350 | * Just the constant zero, for exiting, |
| 351 | * eg. |
| 352 | */ |
| 353 | e = (*com->c_func)(0); |
| 354 | break; |
| 355 | |
| 356 | default: |
| 357 | panic("Unknown argtype"); |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * Exit the current source file on |
| 362 | * error. |
| 363 | */ |
| 364 | |
| 365 | if (e && sourcing) |
| 366 | unstack(); |
| 367 | if (com->c_func == edstop) |
| 368 | return(1); |
| 369 | if (value("autoprint") != NOSTR && com->c_argtype & P) |
| 370 | if ((dot->m_flag & MDELETED) == 0) { |
| 371 | muvec[0] = dot - &message[0] + 1; |
| 372 | muvec[1] = 0; |
| 373 | type(muvec); |
| 374 | } |
| 375 | if (!sourcing) |
| 376 | sawcom = 1; |
| 377 | return(0); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Set the size of the message vector used to construct argument |
| 382 | * lists to message list functions. |
| 383 | */ |
| 384 | |
| 385 | setmsize(sz) |
| 386 | { |
| 387 | |
| 388 | if (msgvec != (int *) 0) |
| 389 | cfree(msgvec); |
| 390 | msgvec = (int *) calloc((unsigned) (sz + 1), sizeof *msgvec); |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Find the correct command in the command table corresponding |
| 395 | * to the passed command "word" |
| 396 | */ |
| 397 | |
| 398 | struct cmd * |
| 399 | lex(word) |
| 400 | char word[]; |
| 401 | { |
| 402 | register struct cmd *cp; |
| 403 | extern struct cmd cmdtab[]; |
| 404 | |
| 405 | for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) |
| 406 | if (isprefix(word, cp->c_name)) |
| 407 | return(cp); |
| 408 | return(NONE); |
| 409 | } |
| 410 | |
| 411 | /* |
| 412 | * Determine if as1 is a valid prefix of as2. |
| 413 | * Return true if yep. |
| 414 | */ |
| 415 | |
| 416 | isprefix(as1, as2) |
| 417 | char *as1, *as2; |
| 418 | { |
| 419 | register char *s1, *s2; |
| 420 | |
| 421 | s1 = as1; |
| 422 | s2 = as2; |
| 423 | while (*s1++ == *s2) |
| 424 | if (*s2++ == '\0') |
| 425 | return(1); |
| 426 | return(*--s1 == '\0'); |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * The following gets called on receipt of a rubout. This is |
| 431 | * to abort printout of a command, mainly. |
| 432 | * Dispatching here when command() is inactive crashes rcv. |
| 433 | * Close all open files except 0, 1, 2, and the temporary. |
| 434 | * The special call to getuserid() is needed so it won't get |
| 435 | * annoyed about losing its open file. |
| 436 | * Also, unstack all source files. |
| 437 | */ |
| 438 | |
| 439 | stop() |
| 440 | { |
| 441 | register FILE *fp; |
| 442 | |
| 443 | noreset = 0; |
| 444 | signal(SIGINT, SIG_IGN); |
| 445 | sawcom++; |
| 446 | while (sourcing) |
| 447 | unstack(); |
| 448 | getuserid((char *) -1); |
| 449 | for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) { |
| 450 | if (fp == stdin || fp == stdout) |
| 451 | continue; |
| 452 | if (fp == itf || fp == otf) |
| 453 | continue; |
| 454 | if (fp == stderr) |
| 455 | continue; |
| 456 | if (fp == pipef) { |
| 457 | pclose(pipef); |
| 458 | pipef = NULL; |
| 459 | continue; |
| 460 | } |
| 461 | fclose(fp); |
| 462 | } |
| 463 | if (image >= 0) { |
| 464 | close(image); |
| 465 | image = -1; |
| 466 | } |
| 467 | clrbuf(stdout); |
| 468 | printf("Interrupt\n"); |
| 469 | signal(SIGINT, stop); |
| 470 | reset(0); |
| 471 | } |
| 472 | |
| 473 | /* |
| 474 | * Announce the presence of the current Mail version, |
| 475 | * give the message count, and print a header listing. |
| 476 | */ |
| 477 | |
| 478 | char *greeting = "Mail version 2.0 %s. Type ? for help.\n"; |
| 479 | |
| 480 | announce(pr) |
| 481 | { |
| 482 | int vec[2], mdot; |
| 483 | extern char *version; |
| 484 | register struct message *mp; |
| 485 | |
| 486 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 487 | if (mp->m_flag & MNEW) |
| 488 | break; |
| 489 | if (mp >= &message[msgCount]) |
| 490 | for (mp = &message[0]; mp < &message[msgCount]; mp++) |
| 491 | if ((mp->m_flag & MREAD) == 0) |
| 492 | break; |
| 493 | if (mp < &message[msgCount]) |
| 494 | mdot = mp - &message[0] + 1; |
| 495 | else |
| 496 | mdot = 1; |
| 497 | vec[0] = mdot; |
| 498 | vec[1] = 0; |
| 499 | if (pr && value("quiet") == NOSTR) |
| 500 | printf(greeting, version); |
| 501 | if (msgCount == 1) |
| 502 | printf("1 message"); |
| 503 | else |
| 504 | printf("%d messages", msgCount); |
| 505 | if (readonly) |
| 506 | printf(" [Read only]"); |
| 507 | printf("\n"); |
| 508 | headers(vec); |
| 509 | dot = &message[mdot - 1]; |
| 510 | } |
| 511 | |
| 512 | strace() {} |
| 513 | |
| 514 | /* |
| 515 | * Print the current version number. |
| 516 | */ |
| 517 | |
| 518 | pversion(e) |
| 519 | { |
| 520 | printf(greeting, version); |
| 521 | return(0); |
| 522 | } |