| 1 | /* Copyright (c) 1980 Regents of the University of California */ |
| 2 | static char *sccsid = "@(#)exrecover.c 6.1 10/18/80"; |
| 3 | #include "ex.h" |
| 4 | #include "ex_temp.h" |
| 5 | #include "ex_tty.h" |
| 6 | #include "local/uparm.h" |
| 7 | |
| 8 | #undef BUFSIZ |
| 9 | #undef EOF |
| 10 | #undef NULL |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <sys/dir.h> |
| 14 | |
| 15 | /* |
| 16 | * Ex recovery program |
| 17 | * exrecover dir name |
| 18 | * exrecover -r |
| 19 | * |
| 20 | * This program searches through the specified directory and then |
| 21 | * the directory usrpath(preserve) looking for an instance of the specified |
| 22 | * file from a crashed editor or a crashed system. |
| 23 | * If this file is found, it is unscrambled and written to |
| 24 | * the standard output. |
| 25 | * |
| 26 | * If this program terminates without a "broken pipe" diagnostic |
| 27 | * (i.e. the editor doesn't die right away) then the buffer we are |
| 28 | * writing from is removed when we finish. This is potentially a mistake |
| 29 | * as there is not enough handshaking to guarantee that the file has actually |
| 30 | * been recovered, but should suffice for most cases. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * For lint's sake... |
| 35 | */ |
| 36 | #ifndef lint |
| 37 | #define ignorl(a) a |
| 38 | #endif |
| 39 | |
| 40 | /* |
| 41 | * This directory definition also appears (obviously) in expreserve.c. |
| 42 | * Change both if you change either. |
| 43 | */ |
| 44 | char mydir[] = usrpath(preserve); |
| 45 | |
| 46 | /* |
| 47 | * Limit on the number of printed entries |
| 48 | * when an, e.g. ``ex -r'' command is given. |
| 49 | */ |
| 50 | #define NENTRY 50 |
| 51 | |
| 52 | char *ctime(); |
| 53 | char nb[BUFSIZ]; |
| 54 | int vercnt; /* Count number of versions of file found */ |
| 55 | |
| 56 | main(argc, argv) |
| 57 | int argc; |
| 58 | char *argv[]; |
| 59 | { |
| 60 | register char *cp; |
| 61 | register int b, i; |
| 62 | |
| 63 | /* |
| 64 | * Initialize as though the editor had just started. |
| 65 | */ |
| 66 | fendcore = (line *) sbrk(0); |
| 67 | dot = zero = dol = fendcore; |
| 68 | one = zero + 1; |
| 69 | endcore = fendcore - 2; |
| 70 | iblock = oblock = -1; |
| 71 | |
| 72 | /* |
| 73 | * If given only a -r argument, then list the saved files. |
| 74 | */ |
| 75 | if (argc == 2 && eq(argv[1], "-r")) { |
| 76 | listfiles(mydir); |
| 77 | exit(0); |
| 78 | } |
| 79 | if (argc != 3) |
| 80 | error(" Wrong number of arguments to exrecover", 0); |
| 81 | |
| 82 | CP(file, argv[2]); |
| 83 | |
| 84 | /* |
| 85 | * Search for this file. |
| 86 | */ |
| 87 | findtmp(argv[1]); |
| 88 | |
| 89 | /* |
| 90 | * Got (one of the versions of) it, write it back to the editor. |
| 91 | */ |
| 92 | cp = ctime(&H.Time); |
| 93 | cp[19] = 0; |
| 94 | fprintf(stderr, " [Dated: %s", cp); |
| 95 | fprintf(stderr, vercnt > 1 ? ", newest of %d saved]" : "]", vercnt); |
| 96 | H.Flines++; |
| 97 | |
| 98 | /* |
| 99 | * Allocate space for the line pointers from the temp file. |
| 100 | */ |
| 101 | if ((int) sbrk((int) (H.Flines * sizeof (line))) == -1) |
| 102 | /* |
| 103 | * Good grief. |
| 104 | */ |
| 105 | error(" Not enough core for lines", 0); |
| 106 | #ifdef DEBUG |
| 107 | fprintf(stderr, "%d lines\n", H.Flines); |
| 108 | #endif |
| 109 | |
| 110 | /* |
| 111 | * Now go get the blocks of seek pointers which are scattered |
| 112 | * throughout the temp file, reconstructing the incore |
| 113 | * line pointers at point of crash. |
| 114 | */ |
| 115 | b = 0; |
| 116 | while (H.Flines > 0) { |
| 117 | ignorl(lseek(tfile, (long) blocks[b] * BUFSIZ, 0)); |
| 118 | i = H.Flines < BUFSIZ / sizeof (line) ? |
| 119 | H.Flines * sizeof (line) : BUFSIZ; |
| 120 | if (read(tfile, (char *) dot, i) != i) { |
| 121 | perror(nb); |
| 122 | exit(1); |
| 123 | } |
| 124 | dot += i / sizeof (line); |
| 125 | H.Flines -= i / sizeof (line); |
| 126 | b++; |
| 127 | } |
| 128 | dot--; dol = dot; |
| 129 | |
| 130 | /* |
| 131 | * Sigh... due to sandbagging some lines may really not be there. |
| 132 | * Find and discard such. This shouldn't happen much. |
| 133 | */ |
| 134 | scrapbad(); |
| 135 | |
| 136 | /* |
| 137 | * Now if there were any lines in the recovered file |
| 138 | * write them to the standard output. |
| 139 | */ |
| 140 | if (dol > zero) { |
| 141 | addr1 = one; addr2 = dol; io = 1; |
| 142 | putfile(); |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Trash the saved buffer. |
| 147 | * Hopefully the system won't crash before the editor |
| 148 | * syncs the new recovered buffer; i.e. for an instant here |
| 149 | * you may lose if the system crashes because this file |
| 150 | * is gone, but the editor hasn't completed reading the recovered |
| 151 | * file from the pipe from us to it. |
| 152 | * |
| 153 | * This doesn't work if we are coming from an non-absolute path |
| 154 | * name since we may have chdir'ed but what the hay, noone really |
| 155 | * ever edits with temporaries in "." anyways. |
| 156 | */ |
| 157 | if (nb[0] == '/') |
| 158 | ignore(unlink(nb)); |
| 159 | |
| 160 | /* |
| 161 | * Adieu. |
| 162 | */ |
| 163 | exit(0); |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Print an error message (notably not in error |
| 168 | * message file). If terminal is in RAW mode, then |
| 169 | * we should be writing output for "vi", so don't print |
| 170 | * a newline which would screw up the screen. |
| 171 | */ |
| 172 | /*VARARGS2*/ |
| 173 | error(str, inf) |
| 174 | char *str; |
| 175 | int inf; |
| 176 | { |
| 177 | |
| 178 | fprintf(stderr, str, inf); |
| 179 | #ifndef USG3TTY |
| 180 | gtty(2, &tty); |
| 181 | if ((tty.sg_flags & RAW) == 0) |
| 182 | #else |
| 183 | ioctl(2, TCGETA, &tty); |
| 184 | if (tty.c_lflag & ICANON) |
| 185 | #endif |
| 186 | fprintf(stderr, "\n"); |
| 187 | exit(1); |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Here we save the information about files, when |
| 192 | * you ask us what files we have saved for you. |
| 193 | * We buffer file name, number of lines, and the time |
| 194 | * at which the file was saved. |
| 195 | */ |
| 196 | struct svfile { |
| 197 | char sf_name[FNSIZE + 1]; |
| 198 | int sf_lines; |
| 199 | char sf_entry[DIRSIZ + 1]; |
| 200 | time_t sf_time; |
| 201 | }; |
| 202 | |
| 203 | listfiles(dirname) |
| 204 | char *dirname; |
| 205 | { |
| 206 | register FILE *dir; |
| 207 | struct direct dirent; |
| 208 | int ecount, qucmp(); |
| 209 | register int f; |
| 210 | char *cp; |
| 211 | struct svfile *fp, svbuf[NENTRY]; |
| 212 | |
| 213 | /* |
| 214 | * Open usrpath(preserve), and go there to make things quick. |
| 215 | */ |
| 216 | dir = fopen(dirname, "r"); |
| 217 | if (dir == NULL) { |
| 218 | perror(dirname); |
| 219 | return; |
| 220 | } |
| 221 | if (chdir(dirname) < 0) { |
| 222 | perror(dirname); |
| 223 | return; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Look at the candidate files in usrpath(preserve). |
| 228 | */ |
| 229 | fp = &svbuf[0]; |
| 230 | ecount = 0; |
| 231 | while (fread((char *) &dirent, sizeof dirent, 1, dir) == 1) { |
| 232 | if (dirent.d_ino == 0) |
| 233 | continue; |
| 234 | if (dirent.d_name[0] != 'E') |
| 235 | continue; |
| 236 | #ifdef DEBUG |
| 237 | fprintf(stderr, "considering %s\n", dirent.d_name); |
| 238 | #endif |
| 239 | /* |
| 240 | * Name begins with E; open it and |
| 241 | * make sure the uid in the header is our uid. |
| 242 | * If not, then don't bother with this file, it can't |
| 243 | * be ours. |
| 244 | */ |
| 245 | f = open(dirent.d_name, 0); |
| 246 | if (f < 0) { |
| 247 | #ifdef DEBUG |
| 248 | fprintf(stderr, "open failed\n"); |
| 249 | #endif |
| 250 | continue; |
| 251 | } |
| 252 | if (read(f, (char *) &H, sizeof H) != sizeof H) { |
| 253 | #ifdef DEBUG |
| 254 | fprintf(stderr, "culdnt read hedr\n"); |
| 255 | #endif |
| 256 | ignore(close(f)); |
| 257 | continue; |
| 258 | } |
| 259 | ignore(close(f)); |
| 260 | if (getuid() != H.Uid) { |
| 261 | #ifdef DEBUG |
| 262 | fprintf(stderr, "uid wrong\n"); |
| 263 | #endif |
| 264 | continue; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Saved the day! |
| 269 | */ |
| 270 | enter(fp++, dirent.d_name, ecount); |
| 271 | ecount++; |
| 272 | #ifdef DEBUG |
| 273 | fprintf(stderr, "entered file %s\n", dirent.d_name); |
| 274 | #endif |
| 275 | } |
| 276 | ignore(fclose(dir)); |
| 277 | |
| 278 | /* |
| 279 | * If any files were saved, then sort them and print |
| 280 | * them out. |
| 281 | */ |
| 282 | if (ecount == 0) { |
| 283 | fprintf(stderr, "No files saved.\n"); |
| 284 | return; |
| 285 | } |
| 286 | qsort(&svbuf[0], ecount, sizeof svbuf[0], qucmp); |
| 287 | for (fp = &svbuf[0]; fp < &svbuf[ecount]; fp++) { |
| 288 | cp = ctime(&fp->sf_time); |
| 289 | cp[10] = 0; |
| 290 | fprintf(stderr, "On %s at ", cp); |
| 291 | cp[16] = 0; |
| 292 | fprintf(stderr, &cp[11]); |
| 293 | fprintf(stderr, " saved %d lines of file \"%s\"\n", |
| 294 | fp->sf_lines, fp->sf_name); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * Enter a new file into the saved file information. |
| 300 | */ |
| 301 | enter(fp, fname, count) |
| 302 | struct svfile *fp; |
| 303 | char *fname; |
| 304 | { |
| 305 | register char *cp, *cp2; |
| 306 | register struct svfile *f, *fl; |
| 307 | time_t curtime, itol(); |
| 308 | |
| 309 | f = 0; |
| 310 | if (count >= NENTRY) { |
| 311 | /* |
| 312 | * My god, a huge number of saved files. |
| 313 | * Would you work on a system that crashed this |
| 314 | * often? Hope not. So lets trash the oldest |
| 315 | * as the most useless. |
| 316 | * |
| 317 | * (I wonder if this code has ever run?) |
| 318 | */ |
| 319 | fl = fp - count + NENTRY - 1; |
| 320 | curtime = fl->sf_time; |
| 321 | for (f = fl; --f > fp-count; ) |
| 322 | if (f->sf_time < curtime) |
| 323 | curtime = f->sf_time; |
| 324 | for (f = fl; --f > fp-count; ) |
| 325 | if (f->sf_time == curtime) |
| 326 | break; |
| 327 | fp = f; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Gotcha. |
| 332 | */ |
| 333 | fp->sf_time = H.Time; |
| 334 | fp->sf_lines = H.Flines; |
| 335 | for (cp2 = fp->sf_name, cp = savedfile; *cp;) |
| 336 | *cp2++ = *cp++; |
| 337 | for (cp2 = fp->sf_entry, cp = fname; *cp && cp-fname < 14;) |
| 338 | *cp2++ = *cp++; |
| 339 | *cp2++ = 0; |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * Do the qsort compare to sort the entries first by file name, |
| 344 | * then by modify time. |
| 345 | */ |
| 346 | qucmp(p1, p2) |
| 347 | struct svfile *p1, *p2; |
| 348 | { |
| 349 | register int t; |
| 350 | |
| 351 | if (t = strcmp(p1->sf_name, p2->sf_name)) |
| 352 | return(t); |
| 353 | if (p1->sf_time > p2->sf_time) |
| 354 | return(-1); |
| 355 | return(p1->sf_time < p2->sf_time); |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Scratch for search. |
| 360 | */ |
| 361 | char bestnb[BUFSIZ]; /* Name of the best one */ |
| 362 | long besttime; /* Time at which the best file was saved */ |
| 363 | int bestfd; /* Keep best file open so it dont vanish */ |
| 364 | |
| 365 | /* |
| 366 | * Look for a file, both in the users directory option value |
| 367 | * (i.e. usually /tmp) and in usrpath(preserve). |
| 368 | * Want to find the newest so we search on and on. |
| 369 | */ |
| 370 | findtmp(dir) |
| 371 | char *dir; |
| 372 | { |
| 373 | |
| 374 | /* |
| 375 | * No name or file so far. |
| 376 | */ |
| 377 | bestnb[0] = 0; |
| 378 | bestfd = -1; |
| 379 | |
| 380 | /* |
| 381 | * Search usrpath(preserve) and, if we can get there, /tmp |
| 382 | * (actually the users "directory" option). |
| 383 | */ |
| 384 | searchdir(dir); |
| 385 | if (chdir(mydir) == 0) |
| 386 | searchdir(mydir); |
| 387 | if (bestfd != -1) { |
| 388 | /* |
| 389 | * Gotcha. |
| 390 | * Put the file (which is already open) in the file |
| 391 | * used by the temp file routines, and save its |
| 392 | * name for later unlinking. |
| 393 | */ |
| 394 | tfile = bestfd; |
| 395 | CP(nb, bestnb); |
| 396 | ignorl(lseek(tfile, 0l, 0)); |
| 397 | |
| 398 | /* |
| 399 | * Gotta be able to read the header or fall through |
| 400 | * to lossage. |
| 401 | */ |
| 402 | if (read(tfile, (char *) &H, sizeof H) == sizeof H) |
| 403 | return; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Extreme lossage... |
| 408 | */ |
| 409 | error(" File not found", 0); |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Search for the file in directory dirname. |
| 414 | * |
| 415 | * Don't chdir here, because the users directory |
| 416 | * may be ".", and we would move away before we searched it. |
| 417 | * Note that we actually chdir elsewhere (because it is too slow |
| 418 | * to look around in usrpath(preserve) without chdir'ing there) so we |
| 419 | * can't win, because we don't know the name of '.' and if the path |
| 420 | * name of the file we want to unlink is relative, rather than absolute |
| 421 | * we won't be able to find it again. |
| 422 | */ |
| 423 | searchdir(dirname) |
| 424 | char *dirname; |
| 425 | { |
| 426 | struct direct dirent; |
| 427 | register FILE *dir; |
| 428 | char dbuf[BUFSIZ]; |
| 429 | |
| 430 | dir = fopen(dirname, "r"); |
| 431 | if (dir == NULL) |
| 432 | return; |
| 433 | setbuf(dir, dbuf); |
| 434 | while (fread((char *) &dirent, sizeof dirent, 1, dir) == 1) { |
| 435 | if (dirent.d_ino == 0) |
| 436 | continue; |
| 437 | if (dirent.d_name[0] != 'E' || dirent.d_name[DIRSIZ - 1] != 0) |
| 438 | continue; |
| 439 | /* |
| 440 | * Got a file in the directory starting with E... |
| 441 | * Save a consed up name for the file to unlink |
| 442 | * later, and check that this is really a file |
| 443 | * we are looking for. |
| 444 | */ |
| 445 | ignore(strcat(strcat(strcpy(nb, dirname), "/"), dirent.d_name)); |
| 446 | if (yeah(nb)) { |
| 447 | /* |
| 448 | * Well, it is the file we are looking for. |
| 449 | * Is it more recent than any version we found before? |
| 450 | */ |
| 451 | if (H.Time > besttime) { |
| 452 | /* |
| 453 | * A winner. |
| 454 | */ |
| 455 | ignore(close(bestfd)); |
| 456 | bestfd = dup(tfile); |
| 457 | besttime = H.Time; |
| 458 | CP(bestnb, nb); |
| 459 | } |
| 460 | /* |
| 461 | * Count versions so user can be told there are |
| 462 | * ``yet more pages to be turned''. |
| 463 | */ |
| 464 | vercnt++; |
| 465 | } |
| 466 | ignore(close(tfile)); |
| 467 | } |
| 468 | ignore(fclose(dir)); |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * Given a candidate file to be recovered, see |
| 473 | * if its really an editor temporary and of this |
| 474 | * user and the file specified. |
| 475 | */ |
| 476 | yeah(name) |
| 477 | char *name; |
| 478 | { |
| 479 | |
| 480 | tfile = open(name, 2); |
| 481 | if (tfile < 0) |
| 482 | return (0); |
| 483 | if (read(tfile, (char *) &H, sizeof H) != sizeof H) { |
| 484 | nope: |
| 485 | ignore(close(tfile)); |
| 486 | return (0); |
| 487 | } |
| 488 | if (!eq(savedfile, file)) |
| 489 | goto nope; |
| 490 | if (getuid() != H.Uid) |
| 491 | goto nope; |
| 492 | /* |
| 493 | * This is old and stupid code, which |
| 494 | * puts a word LOST in the header block, so that lost lines |
| 495 | * can be made to point at it. |
| 496 | */ |
| 497 | ignorl(lseek(tfile, (long)(BUFSIZ*HBLKS-8), 0)); |
| 498 | ignore(write(tfile, "LOST", 5)); |
| 499 | return (1); |
| 500 | } |
| 501 | |
| 502 | preserve() |
| 503 | { |
| 504 | |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * Find the true end of the scratch file, and ``LOSE'' |
| 509 | * lines which point into thin air. This lossage occurs |
| 510 | * due to the sandbagging of i/o which can cause blocks to |
| 511 | * be written in a non-obvious order, different from the order |
| 512 | * in which the editor tried to write them. |
| 513 | * |
| 514 | * Lines which are lost are replaced with the text LOST so |
| 515 | * they are easy to find. We work hard at pretty formatting here |
| 516 | * as lines tend to be lost in blocks. |
| 517 | * |
| 518 | * This only seems to happen on very heavily loaded systems, and |
| 519 | * not very often. |
| 520 | */ |
| 521 | scrapbad() |
| 522 | { |
| 523 | register line *ip; |
| 524 | struct stat stbuf; |
| 525 | off_t size, maxt; |
| 526 | int bno, cnt, bad, was; |
| 527 | char bk[BUFSIZ]; |
| 528 | |
| 529 | ignore(fstat(tfile, &stbuf)); |
| 530 | size = stbuf.st_size; |
| 531 | maxt = (size >> SHFT) | (BNDRY-1); |
| 532 | bno = (maxt >> OFFBTS) & BLKMSK; |
| 533 | #ifdef DEBUG |
| 534 | fprintf(stderr, "size %ld, maxt %o, bno %d\n", size, maxt, bno); |
| 535 | #endif |
| 536 | |
| 537 | /* |
| 538 | * Look for a null separating two lines in the temp file; |
| 539 | * if last line was split across blocks, then it is lost |
| 540 | * if the last block is. |
| 541 | */ |
| 542 | while (bno > 0) { |
| 543 | ignorl(lseek(tfile, (long) BUFSIZ * bno, 0)); |
| 544 | cnt = read(tfile, (char *) bk, BUFSIZ); |
| 545 | while (cnt > 0) |
| 546 | if (bk[--cnt] == 0) |
| 547 | goto null; |
| 548 | bno--; |
| 549 | } |
| 550 | null: |
| 551 | |
| 552 | /* |
| 553 | * Magically calculate the largest valid pointer in the temp file, |
| 554 | * consing it up from the block number and the count. |
| 555 | */ |
| 556 | maxt = ((bno << OFFBTS) | (cnt >> SHFT)) & ~1; |
| 557 | #ifdef DEBUG |
| 558 | fprintf(stderr, "bno %d, cnt %d, maxt %o\n", bno, cnt, maxt); |
| 559 | #endif |
| 560 | |
| 561 | /* |
| 562 | * Now cycle through the line pointers, |
| 563 | * trashing the Lusers. |
| 564 | */ |
| 565 | was = bad = 0; |
| 566 | for (ip = one; ip <= dol; ip++) |
| 567 | if (*ip > maxt) { |
| 568 | #ifdef DEBUG |
| 569 | fprintf(stderr, "%d bad, %o > %o\n", ip - zero, *ip, maxt); |
| 570 | #endif |
| 571 | if (was == 0) |
| 572 | was = ip - zero; |
| 573 | *ip = ((HBLKS*BUFSIZ)-8) >> SHFT; |
| 574 | } else if (was) { |
| 575 | if (bad == 0) |
| 576 | fprintf(stderr, " [Lost line(s):"); |
| 577 | fprintf(stderr, " %d", was); |
| 578 | if ((ip - 1) - zero > was) |
| 579 | fprintf(stderr, "-%d", (ip - 1) - zero); |
| 580 | bad++; |
| 581 | was = 0; |
| 582 | } |
| 583 | if (was != 0) { |
| 584 | if (bad == 0) |
| 585 | fprintf(stderr, " [Lost line(s):"); |
| 586 | fprintf(stderr, " %d", was); |
| 587 | if (dol - zero != was) |
| 588 | fprintf(stderr, "-%d", dol - zero); |
| 589 | bad++; |
| 590 | } |
| 591 | if (bad) |
| 592 | fprintf(stderr, "]"); |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Aw shucks, if we only had a (void) cast. |
| 597 | */ |
| 598 | #ifdef lint |
| 599 | Ignorl(a) |
| 600 | long a; |
| 601 | { |
| 602 | |
| 603 | a = a; |
| 604 | } |
| 605 | |
| 606 | Ignore(a) |
| 607 | char *a; |
| 608 | { |
| 609 | |
| 610 | a = a; |
| 611 | } |
| 612 | |
| 613 | Ignorf(a) |
| 614 | int (*a)(); |
| 615 | { |
| 616 | |
| 617 | a = a; |
| 618 | } |
| 619 | |
| 620 | ignorl(a) |
| 621 | long a; |
| 622 | { |
| 623 | |
| 624 | a = a; |
| 625 | } |
| 626 | #endif |
| 627 | |
| 628 | int cntch, cntln, cntodd, cntnull; |
| 629 | /* |
| 630 | * Following routines stolen mercilessly from ex. |
| 631 | */ |
| 632 | putfile() |
| 633 | { |
| 634 | line *a1; |
| 635 | register char *fp, *lp; |
| 636 | register int nib; |
| 637 | |
| 638 | a1 = addr1; |
| 639 | clrstats(); |
| 640 | cntln = addr2 - a1 + 1; |
| 641 | if (cntln == 0) |
| 642 | return; |
| 643 | nib = BUFSIZ; |
| 644 | fp = genbuf; |
| 645 | do { |
| 646 | getline(*a1++); |
| 647 | lp = linebuf; |
| 648 | for (;;) { |
| 649 | if (--nib < 0) { |
| 650 | nib = fp - genbuf; |
| 651 | if (write(io, genbuf, nib) != nib) |
| 652 | wrerror(); |
| 653 | cntch += nib; |
| 654 | nib = 511; |
| 655 | fp = genbuf; |
| 656 | } |
| 657 | if ((*fp++ = *lp++) == 0) { |
| 658 | fp[-1] = '\n'; |
| 659 | break; |
| 660 | } |
| 661 | } |
| 662 | } while (a1 <= addr2); |
| 663 | nib = fp - genbuf; |
| 664 | if (write(io, genbuf, nib) != nib) |
| 665 | wrerror(); |
| 666 | cntch += nib; |
| 667 | } |
| 668 | |
| 669 | wrerror() |
| 670 | { |
| 671 | |
| 672 | syserror(); |
| 673 | } |
| 674 | |
| 675 | clrstats() |
| 676 | { |
| 677 | |
| 678 | ninbuf = 0; |
| 679 | cntch = 0; |
| 680 | cntln = 0; |
| 681 | cntnull = 0; |
| 682 | cntodd = 0; |
| 683 | } |
| 684 | |
| 685 | #define READ 0 |
| 686 | #define WRITE 1 |
| 687 | |
| 688 | getline(tl) |
| 689 | line tl; |
| 690 | { |
| 691 | register char *bp, *lp; |
| 692 | register int nl; |
| 693 | |
| 694 | lp = linebuf; |
| 695 | bp = getblock(tl, READ); |
| 696 | nl = nleft; |
| 697 | tl &= ~OFFMSK; |
| 698 | while (*lp++ = *bp++) |
| 699 | if (--nl == 0) { |
| 700 | bp = getblock(tl += INCRMT, READ); |
| 701 | nl = nleft; |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | int read(); |
| 706 | int write(); |
| 707 | |
| 708 | char * |
| 709 | getblock(atl, iof) |
| 710 | line atl; |
| 711 | int iof; |
| 712 | { |
| 713 | register int bno, off; |
| 714 | |
| 715 | bno = (atl >> OFFBTS) & BLKMSK; |
| 716 | off = (atl << SHFT) & LBTMSK; |
| 717 | if (bno >= NMBLKS) |
| 718 | error(" Tmp file too large"); |
| 719 | nleft = BUFSIZ - off; |
| 720 | if (bno == iblock) { |
| 721 | ichanged |= iof; |
| 722 | return (ibuff + off); |
| 723 | } |
| 724 | if (bno == oblock) |
| 725 | return (obuff + off); |
| 726 | if (iof == READ) { |
| 727 | if (ichanged) |
| 728 | blkio(iblock, ibuff, write); |
| 729 | ichanged = 0; |
| 730 | iblock = bno; |
| 731 | blkio(bno, ibuff, read); |
| 732 | return (ibuff + off); |
| 733 | } |
| 734 | if (oblock >= 0) |
| 735 | blkio(oblock, obuff, write); |
| 736 | oblock = bno; |
| 737 | return (obuff + off); |
| 738 | } |
| 739 | |
| 740 | blkio(b, buf, iofcn) |
| 741 | short b; |
| 742 | char *buf; |
| 743 | int (*iofcn)(); |
| 744 | { |
| 745 | |
| 746 | lseek(tfile, (long) (unsigned) b * BUFSIZ, 0); |
| 747 | if ((*iofcn)(tfile, buf, BUFSIZ) != BUFSIZ) |
| 748 | syserror(); |
| 749 | } |
| 750 | |
| 751 | syserror() |
| 752 | { |
| 753 | extern int sys_nerr; |
| 754 | extern char *sys_errlist[]; |
| 755 | |
| 756 | dirtcnt = 0; |
| 757 | write(2, " ", 1); |
| 758 | if (errno >= 0 && errno <= sys_nerr) |
| 759 | error(sys_errlist[errno]); |
| 760 | else |
| 761 | error("System error %d", errno); |
| 762 | exit(1); |
| 763 | } |