Commit | Line | Data |
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f9679f70 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
70190965 | 8 | char *copyright = |
f9679f70 DF |
9 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
13 | #ifndef lint | |
7af1139d | 14 | static char *sccsid = "@(#)ex3.7recover.c 7.12 (Berkeley) %G%"; |
f9679f70 DF |
15 | #endif not lint |
16 | ||
299f2784 MH |
17 | #include <stdio.h> /* mjm: BUFSIZ: stdio = 512, VMUNIX = 1024 */ |
18 | #undef BUFSIZ /* mjm: BUFSIZ different */ | |
19 | #undef EOF /* mjm: EOF and NULL effectively the same */ | |
20 | #undef NULL | |
121208f7 | 21 | |
f3270895 MH |
22 | #include "ex.h" |
23 | #include "ex_temp.h" | |
24 | #include "ex_tty.h" | |
7d3f9b2b | 25 | #include <sys/dir.h> |
f3270895 | 26 | |
df6bc3aa MH |
27 | char xstr[1]; /* make loader happy */ |
28 | short tfile = -1; /* ditto */ | |
f3270895 | 29 | |
121208f7 | 30 | /* |
f3270895 MH |
31 | * |
32 | * This program searches through the specified directory and then | |
435e8dff | 33 | * the directory _PATH_USRPRESERVE looking for an instance of the specified |
f3270895 MH |
34 | * file from a crashed editor or a crashed system. |
35 | * If this file is found, it is unscrambled and written to | |
36 | * the standard output. | |
37 | * | |
38 | * If this program terminates without a "broken pipe" diagnostic | |
39 | * (i.e. the editor doesn't die right away) then the buffer we are | |
40 | * writing from is removed when we finish. This is potentially a mistake | |
41 | * as there is not enough handshaking to guarantee that the file has actually | |
42 | * been recovered, but should suffice for most cases. | |
43 | */ | |
44 | ||
45 | /* | |
46 | * For lint's sake... | |
47 | */ | |
48 | #ifndef lint | |
49 | #define ignorl(a) a | |
50 | #endif | |
51 | ||
f3270895 MH |
52 | /* |
53 | * Limit on the number of printed entries | |
54 | * when an, e.g. ``ex -r'' command is given. | |
55 | */ | |
56 | #define NENTRY 50 | |
57 | ||
58 | char *ctime(); | |
59 | char nb[BUFSIZ]; | |
60 | int vercnt; /* Count number of versions of file found */ | |
61 | ||
62 | main(argc, argv) | |
63 | int argc; | |
64 | char *argv[]; | |
65 | { | |
66 | register char *cp; | |
67 | register int b, i; | |
68 | ||
69 | /* | |
70 | * Initialize as though the editor had just started. | |
71 | */ | |
72 | fendcore = (line *) sbrk(0); | |
73 | dot = zero = dol = fendcore; | |
74 | one = zero + 1; | |
75 | endcore = fendcore - 2; | |
76 | iblock = oblock = -1; | |
77 | ||
78 | /* | |
79 | * If given only a -r argument, then list the saved files. | |
80 | */ | |
81 | if (argc == 2 && eq(argv[1], "-r")) { | |
435e8dff | 82 | listfiles(_PATH_PRESERVE); |
f3270895 MH |
83 | exit(0); |
84 | } | |
85 | if (argc != 3) | |
86 | error(" Wrong number of arguments to exrecover", 0); | |
87 | ||
88 | CP(file, argv[2]); | |
89 | ||
90 | /* | |
91 | * Search for this file. | |
92 | */ | |
93 | findtmp(argv[1]); | |
94 | ||
95 | /* | |
96 | * Got (one of the versions of) it, write it back to the editor. | |
97 | */ | |
98 | cp = ctime(&H.Time); | |
99 | cp[19] = 0; | |
100 | fprintf(stderr, " [Dated: %s", cp); | |
101 | fprintf(stderr, vercnt > 1 ? ", newest of %d saved]" : "]", vercnt); | |
102 | H.Flines++; | |
103 | ||
104 | /* | |
105 | * Allocate space for the line pointers from the temp file. | |
106 | */ | |
107 | if ((int) sbrk((int) (H.Flines * sizeof (line))) == -1) | |
108 | /* | |
109 | * Good grief. | |
110 | */ | |
111 | error(" Not enough core for lines", 0); | |
112 | #ifdef DEBUG | |
113 | fprintf(stderr, "%d lines\n", H.Flines); | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * Now go get the blocks of seek pointers which are scattered | |
118 | * throughout the temp file, reconstructing the incore | |
119 | * line pointers at point of crash. | |
120 | */ | |
121 | b = 0; | |
122 | while (H.Flines > 0) { | |
123 | ignorl(lseek(tfile, (long) blocks[b] * BUFSIZ, 0)); | |
124 | i = H.Flines < BUFSIZ / sizeof (line) ? | |
125 | H.Flines * sizeof (line) : BUFSIZ; | |
126 | if (read(tfile, (char *) dot, i) != i) { | |
127 | perror(nb); | |
128 | exit(1); | |
129 | } | |
130 | dot += i / sizeof (line); | |
131 | H.Flines -= i / sizeof (line); | |
132 | b++; | |
133 | } | |
134 | dot--; dol = dot; | |
135 | ||
136 | /* | |
137 | * Sigh... due to sandbagging some lines may really not be there. | |
138 | * Find and discard such. This shouldn't happen much. | |
139 | */ | |
140 | scrapbad(); | |
141 | ||
142 | /* | |
143 | * Now if there were any lines in the recovered file | |
144 | * write them to the standard output. | |
145 | */ | |
146 | if (dol > zero) { | |
147 | addr1 = one; addr2 = dol; io = 1; | |
299f2784 | 148 | putfile(0); |
f3270895 MH |
149 | } |
150 | ||
151 | /* | |
152 | * Trash the saved buffer. | |
153 | * Hopefully the system won't crash before the editor | |
154 | * syncs the new recovered buffer; i.e. for an instant here | |
155 | * you may lose if the system crashes because this file | |
156 | * is gone, but the editor hasn't completed reading the recovered | |
157 | * file from the pipe from us to it. | |
158 | * | |
159 | * This doesn't work if we are coming from an non-absolute path | |
160 | * name since we may have chdir'ed but what the hay, noone really | |
161 | * ever edits with temporaries in "." anyways. | |
162 | */ | |
163 | if (nb[0] == '/') | |
164 | ignore(unlink(nb)); | |
165 | ||
166 | /* | |
167 | * Adieu. | |
168 | */ | |
169 | exit(0); | |
170 | } | |
171 | ||
172 | /* | |
173 | * Print an error message (notably not in error | |
174 | * message file). If terminal is in RAW mode, then | |
175 | * we should be writing output for "vi", so don't print | |
176 | * a newline which would screw up the screen. | |
177 | */ | |
178 | /*VARARGS2*/ | |
179 | error(str, inf) | |
180 | char *str; | |
181 | int inf; | |
182 | { | |
183 | ||
184 | fprintf(stderr, str, inf); | |
88ff8fc7 | 185 | (void)ioctl(2, TIOCGETP, &tty); |
f3270895 MH |
186 | if ((tty.sg_flags & RAW) == 0) |
187 | fprintf(stderr, "\n"); | |
188 | exit(1); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Here we save the information about files, when | |
193 | * you ask us what files we have saved for you. | |
194 | * We buffer file name, number of lines, and the time | |
195 | * at which the file was saved. | |
196 | */ | |
197 | struct svfile { | |
198 | char sf_name[FNSIZE + 1]; | |
199 | int sf_lines; | |
7d3f9b2b | 200 | char sf_entry[MAXNAMLEN + 1]; |
f3270895 MH |
201 | time_t sf_time; |
202 | }; | |
203 | ||
204 | listfiles(dirname) | |
205 | char *dirname; | |
206 | { | |
7d3f9b2b RC |
207 | register DIR *dir; |
208 | struct direct *dirent; | |
f3270895 MH |
209 | int ecount, qucmp(); |
210 | register int f; | |
211 | char *cp; | |
212 | struct svfile *fp, svbuf[NENTRY]; | |
213 | ||
214 | /* | |
435e8dff | 215 | * Open _PATH_PRESERVE, and go there to make things quick. |
f3270895 | 216 | */ |
7d3f9b2b | 217 | dir = opendir(dirname); |
f3270895 MH |
218 | if (dir == NULL) { |
219 | perror(dirname); | |
220 | return; | |
221 | } | |
222 | if (chdir(dirname) < 0) { | |
223 | perror(dirname); | |
224 | return; | |
225 | } | |
226 | ||
227 | /* | |
435e8dff | 228 | * Look at the candidate files in _PATH_PRESERVE. |
f3270895 MH |
229 | */ |
230 | fp = &svbuf[0]; | |
231 | ecount = 0; | |
7d3f9b2b RC |
232 | while ((dirent = readdir(dir)) != NULL) { |
233 | if (dirent->d_name[0] != 'E') | |
f3270895 MH |
234 | continue; |
235 | #ifdef DEBUG | |
7d3f9b2b | 236 | fprintf(stderr, "considering %s\n", dirent->d_name); |
f3270895 MH |
237 | #endif |
238 | /* | |
239 | * Name begins with E; open it and | |
240 | * make sure the uid in the header is our uid. | |
241 | * If not, then don't bother with this file, it can't | |
242 | * be ours. | |
243 | */ | |
7d3f9b2b | 244 | f = open(dirent->d_name, 0); |
f3270895 MH |
245 | if (f < 0) { |
246 | #ifdef DEBUG | |
247 | fprintf(stderr, "open failed\n"); | |
248 | #endif | |
249 | continue; | |
250 | } | |
251 | if (read(f, (char *) &H, sizeof H) != sizeof H) { | |
252 | #ifdef DEBUG | |
253 | fprintf(stderr, "culdnt read hedr\n"); | |
254 | #endif | |
255 | ignore(close(f)); | |
256 | continue; | |
257 | } | |
258 | ignore(close(f)); | |
259 | if (getuid() != H.Uid) { | |
260 | #ifdef DEBUG | |
261 | fprintf(stderr, "uid wrong\n"); | |
262 | #endif | |
263 | continue; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Saved the day! | |
268 | */ | |
7d3f9b2b | 269 | enter(fp++, dirent->d_name, ecount); |
f3270895 MH |
270 | ecount++; |
271 | #ifdef DEBUG | |
7d3f9b2b | 272 | fprintf(stderr, "entered file %s\n", dirent->d_name); |
f3270895 MH |
273 | #endif |
274 | } | |
7d3f9b2b | 275 | ignore(closedir(dir)); |
f3270895 MH |
276 | |
277 | /* | |
278 | * If any files were saved, then sort them and print | |
279 | * them out. | |
280 | */ | |
281 | if (ecount == 0) { | |
282 | fprintf(stderr, "No files saved.\n"); | |
283 | return; | |
284 | } | |
285 | qsort(&svbuf[0], ecount, sizeof svbuf[0], qucmp); | |
286 | for (fp = &svbuf[0]; fp < &svbuf[ecount]; fp++) { | |
287 | cp = ctime(&fp->sf_time); | |
288 | cp[10] = 0; | |
289 | fprintf(stderr, "On %s at ", cp); | |
290 | cp[16] = 0; | |
291 | fprintf(stderr, &cp[11]); | |
292 | fprintf(stderr, " saved %d lines of file \"%s\"\n", | |
293 | fp->sf_lines, fp->sf_name); | |
294 | } | |
295 | } | |
296 | ||
297 | /* | |
298 | * Enter a new file into the saved file information. | |
299 | */ | |
300 | enter(fp, fname, count) | |
301 | struct svfile *fp; | |
302 | char *fname; | |
303 | { | |
304 | register char *cp, *cp2; | |
305 | register struct svfile *f, *fl; | |
306 | time_t curtime, itol(); | |
307 | ||
308 | f = 0; | |
309 | if (count >= NENTRY) { | |
310 | /* | |
311 | * My god, a huge number of saved files. | |
312 | * Would you work on a system that crashed this | |
313 | * often? Hope not. So lets trash the oldest | |
314 | * as the most useless. | |
315 | * | |
316 | * (I wonder if this code has ever run?) | |
317 | */ | |
318 | fl = fp - count + NENTRY - 1; | |
319 | curtime = fl->sf_time; | |
320 | for (f = fl; --f > fp-count; ) | |
321 | if (f->sf_time < curtime) | |
322 | curtime = f->sf_time; | |
323 | for (f = fl; --f > fp-count; ) | |
324 | if (f->sf_time == curtime) | |
325 | break; | |
326 | fp = f; | |
327 | } | |
328 | ||
329 | /* | |
330 | * Gotcha. | |
331 | */ | |
332 | fp->sf_time = H.Time; | |
333 | fp->sf_lines = H.Flines; | |
334 | for (cp2 = fp->sf_name, cp = savedfile; *cp;) | |
335 | *cp2++ = *cp++; | |
336 | for (cp2 = fp->sf_entry, cp = fname; *cp && cp-fname < 14;) | |
337 | *cp2++ = *cp++; | |
338 | *cp2++ = 0; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Do the qsort compare to sort the entries first by file name, | |
343 | * then by modify time. | |
344 | */ | |
345 | qucmp(p1, p2) | |
346 | struct svfile *p1, *p2; | |
347 | { | |
348 | register int t; | |
349 | ||
350 | if (t = strcmp(p1->sf_name, p2->sf_name)) | |
351 | return(t); | |
352 | if (p1->sf_time > p2->sf_time) | |
353 | return(-1); | |
354 | return(p1->sf_time < p2->sf_time); | |
355 | } | |
356 | ||
357 | /* | |
358 | * Scratch for search. | |
359 | */ | |
360 | char bestnb[BUFSIZ]; /* Name of the best one */ | |
361 | long besttime; /* Time at which the best file was saved */ | |
362 | int bestfd; /* Keep best file open so it dont vanish */ | |
363 | ||
364 | /* | |
365 | * Look for a file, both in the users directory option value | |
435e8dff | 366 | * (i.e. usually /tmp) and in _PATH_PRESERVE. |
f3270895 MH |
367 | * Want to find the newest so we search on and on. |
368 | */ | |
369 | findtmp(dir) | |
370 | char *dir; | |
371 | { | |
372 | ||
373 | /* | |
374 | * No name or file so far. | |
375 | */ | |
376 | bestnb[0] = 0; | |
377 | bestfd = -1; | |
378 | ||
379 | /* | |
435e8dff | 380 | * Search _PATH_PRESERVE and, if we can get there, /tmp |
f3270895 MH |
381 | * (actually the users "directory" option). |
382 | */ | |
383 | searchdir(dir); | |
435e8dff KB |
384 | if (chdir(_PATH_PRESERVE) == 0) |
385 | searchdir(_PATH_PRESERVE); | |
f3270895 MH |
386 | if (bestfd != -1) { |
387 | /* | |
388 | * Gotcha. | |
389 | * Put the file (which is already open) in the file | |
390 | * used by the temp file routines, and save its | |
391 | * name for later unlinking. | |
392 | */ | |
393 | tfile = bestfd; | |
394 | CP(nb, bestnb); | |
395 | ignorl(lseek(tfile, 0l, 0)); | |
396 | ||
397 | /* | |
398 | * Gotta be able to read the header or fall through | |
399 | * to lossage. | |
400 | */ | |
401 | if (read(tfile, (char *) &H, sizeof H) == sizeof H) | |
402 | return; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Extreme lossage... | |
407 | */ | |
408 | error(" File not found", 0); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Search for the file in directory dirname. | |
413 | * | |
414 | * Don't chdir here, because the users directory | |
415 | * may be ".", and we would move away before we searched it. | |
416 | * Note that we actually chdir elsewhere (because it is too slow | |
435e8dff | 417 | * to look around in _PATH_PRESERVE without chdir'ing there) so we |
f3270895 MH |
418 | * can't win, because we don't know the name of '.' and if the path |
419 | * name of the file we want to unlink is relative, rather than absolute | |
420 | * we won't be able to find it again. | |
421 | */ | |
422 | searchdir(dirname) | |
423 | char *dirname; | |
424 | { | |
7d3f9b2b RC |
425 | struct direct *dirent; |
426 | register DIR *dir; | |
f3270895 MH |
427 | char dbuf[BUFSIZ]; |
428 | ||
7d3f9b2b | 429 | dir = opendir(dirname); |
f3270895 MH |
430 | if (dir == NULL) |
431 | return; | |
7d3f9b2b RC |
432 | while ((dirent = readdir(dir)) != NULL) { |
433 | if (dirent->d_name[0] != 'E') | |
f3270895 MH |
434 | continue; |
435 | /* | |
436 | * Got a file in the directory starting with E... | |
437 | * Save a consed up name for the file to unlink | |
438 | * later, and check that this is really a file | |
439 | * we are looking for. | |
440 | */ | |
7d3f9b2b | 441 | ignore(strcat(strcat(strcpy(nb, dirname), "/"), dirent->d_name)); |
f3270895 MH |
442 | if (yeah(nb)) { |
443 | /* | |
444 | * Well, it is the file we are looking for. | |
445 | * Is it more recent than any version we found before? | |
446 | */ | |
447 | if (H.Time > besttime) { | |
448 | /* | |
449 | * A winner. | |
450 | */ | |
451 | ignore(close(bestfd)); | |
452 | bestfd = dup(tfile); | |
453 | besttime = H.Time; | |
454 | CP(bestnb, nb); | |
455 | } | |
456 | /* | |
457 | * Count versions so user can be told there are | |
458 | * ``yet more pages to be turned''. | |
459 | */ | |
460 | vercnt++; | |
461 | } | |
462 | ignore(close(tfile)); | |
463 | } | |
7d3f9b2b | 464 | ignore(closedir(dir)); |
f3270895 MH |
465 | } |
466 | ||
467 | /* | |
468 | * Given a candidate file to be recovered, see | |
469 | * if its really an editor temporary and of this | |
470 | * user and the file specified. | |
471 | */ | |
472 | yeah(name) | |
473 | char *name; | |
474 | { | |
475 | ||
476 | tfile = open(name, 2); | |
477 | if (tfile < 0) | |
478 | return (0); | |
479 | if (read(tfile, (char *) &H, sizeof H) != sizeof H) { | |
480 | nope: | |
481 | ignore(close(tfile)); | |
482 | return (0); | |
483 | } | |
484 | if (!eq(savedfile, file)) | |
485 | goto nope; | |
486 | if (getuid() != H.Uid) | |
487 | goto nope; | |
488 | /* | |
489 | * This is old and stupid code, which | |
490 | * puts a word LOST in the header block, so that lost lines | |
491 | * can be made to point at it. | |
492 | */ | |
44232d5b | 493 | ignorl(lseek(tfile, (long)(BUFSIZ*HBLKS-8), 0)); |
f3270895 MH |
494 | ignore(write(tfile, "LOST", 5)); |
495 | return (1); | |
496 | } | |
497 | ||
498 | preserve() | |
499 | { | |
500 | ||
501 | } | |
502 | ||
503 | /* | |
504 | * Find the true end of the scratch file, and ``LOSE'' | |
505 | * lines which point into thin air. This lossage occurs | |
506 | * due to the sandbagging of i/o which can cause blocks to | |
507 | * be written in a non-obvious order, different from the order | |
508 | * in which the editor tried to write them. | |
509 | * | |
510 | * Lines which are lost are replaced with the text LOST so | |
511 | * they are easy to find. We work hard at pretty formatting here | |
512 | * as lines tend to be lost in blocks. | |
513 | * | |
514 | * This only seems to happen on very heavily loaded systems, and | |
515 | * not very often. | |
516 | */ | |
517 | scrapbad() | |
518 | { | |
519 | register line *ip; | |
520 | struct stat stbuf; | |
521 | off_t size, maxt; | |
522 | int bno, cnt, bad, was; | |
523 | char bk[BUFSIZ]; | |
524 | ||
525 | ignore(fstat(tfile, &stbuf)); | |
526 | size = stbuf.st_size; | |
44232d5b | 527 | maxt = (size >> SHFT) | (BNDRY-1); |
f3270895 MH |
528 | bno = (maxt >> OFFBTS) & BLKMSK; |
529 | #ifdef DEBUG | |
530 | fprintf(stderr, "size %ld, maxt %o, bno %d\n", size, maxt, bno); | |
531 | #endif | |
532 | ||
533 | /* | |
534 | * Look for a null separating two lines in the temp file; | |
535 | * if last line was split across blocks, then it is lost | |
536 | * if the last block is. | |
537 | */ | |
538 | while (bno > 0) { | |
539 | ignorl(lseek(tfile, (long) BUFSIZ * bno, 0)); | |
540 | cnt = read(tfile, (char *) bk, BUFSIZ); | |
541 | while (cnt > 0) | |
542 | if (bk[--cnt] == 0) | |
543 | goto null; | |
544 | bno--; | |
545 | } | |
546 | null: | |
547 | ||
548 | /* | |
549 | * Magically calculate the largest valid pointer in the temp file, | |
550 | * consing it up from the block number and the count. | |
551 | */ | |
552 | maxt = ((bno << OFFBTS) | (cnt >> SHFT)) & ~1; | |
553 | #ifdef DEBUG | |
554 | fprintf(stderr, "bno %d, cnt %d, maxt %o\n", bno, cnt, maxt); | |
555 | #endif | |
556 | ||
557 | /* | |
558 | * Now cycle through the line pointers, | |
559 | * trashing the Lusers. | |
560 | */ | |
561 | was = bad = 0; | |
562 | for (ip = one; ip <= dol; ip++) | |
563 | if (*ip > maxt) { | |
564 | #ifdef DEBUG | |
565 | fprintf(stderr, "%d bad, %o > %o\n", ip - zero, *ip, maxt); | |
566 | #endif | |
567 | if (was == 0) | |
568 | was = ip - zero; | |
44232d5b | 569 | *ip = ((HBLKS*BUFSIZ)-8) >> SHFT; |
f3270895 MH |
570 | } else if (was) { |
571 | if (bad == 0) | |
572 | fprintf(stderr, " [Lost line(s):"); | |
573 | fprintf(stderr, " %d", was); | |
574 | if ((ip - 1) - zero > was) | |
575 | fprintf(stderr, "-%d", (ip - 1) - zero); | |
576 | bad++; | |
577 | was = 0; | |
578 | } | |
579 | if (was != 0) { | |
580 | if (bad == 0) | |
581 | fprintf(stderr, " [Lost line(s):"); | |
582 | fprintf(stderr, " %d", was); | |
583 | if (dol - zero != was) | |
584 | fprintf(stderr, "-%d", dol - zero); | |
585 | bad++; | |
586 | } | |
587 | if (bad) | |
588 | fprintf(stderr, "]"); | |
589 | } | |
590 | ||
591 | /* | |
592 | * Aw shucks, if we only had a (void) cast. | |
593 | */ | |
594 | #ifdef lint | |
595 | Ignorl(a) | |
596 | long a; | |
597 | { | |
598 | ||
599 | a = a; | |
600 | } | |
601 | ||
602 | Ignore(a) | |
603 | char *a; | |
604 | { | |
605 | ||
606 | a = a; | |
607 | } | |
608 | ||
609 | Ignorf(a) | |
610 | int (*a)(); | |
611 | { | |
612 | ||
613 | a = a; | |
614 | } | |
615 | ||
616 | ignorl(a) | |
617 | long a; | |
618 | { | |
619 | ||
620 | a = a; | |
621 | } | |
622 | #endif | |
623 | ||
624 | int cntch, cntln, cntodd, cntnull; | |
625 | /* | |
626 | * Following routines stolen mercilessly from ex. | |
627 | */ | |
628 | putfile() | |
629 | { | |
630 | line *a1; | |
631 | register char *fp, *lp; | |
632 | register int nib; | |
633 | ||
634 | a1 = addr1; | |
635 | clrstats(); | |
636 | cntln = addr2 - a1 + 1; | |
637 | if (cntln == 0) | |
638 | return; | |
639 | nib = BUFSIZ; | |
640 | fp = genbuf; | |
641 | do { | |
642 | getline(*a1++); | |
643 | lp = linebuf; | |
644 | for (;;) { | |
645 | if (--nib < 0) { | |
646 | nib = fp - genbuf; | |
647 | if (write(io, genbuf, nib) != nib) | |
648 | wrerror(); | |
649 | cntch += nib; | |
650 | nib = 511; | |
651 | fp = genbuf; | |
652 | } | |
653 | if ((*fp++ = *lp++) == 0) { | |
654 | fp[-1] = '\n'; | |
655 | break; | |
656 | } | |
657 | } | |
658 | } while (a1 <= addr2); | |
659 | nib = fp - genbuf; | |
660 | if (write(io, genbuf, nib) != nib) | |
661 | wrerror(); | |
662 | cntch += nib; | |
663 | } | |
664 | ||
665 | wrerror() | |
666 | { | |
667 | ||
668 | syserror(); | |
669 | } | |
670 | ||
671 | clrstats() | |
672 | { | |
673 | ||
674 | ninbuf = 0; | |
675 | cntch = 0; | |
676 | cntln = 0; | |
677 | cntnull = 0; | |
678 | cntodd = 0; | |
679 | } | |
680 | ||
681 | #define READ 0 | |
682 | #define WRITE 1 | |
683 | ||
684 | getline(tl) | |
685 | line tl; | |
686 | { | |
687 | register char *bp, *lp; | |
688 | register int nl; | |
689 | ||
690 | lp = linebuf; | |
691 | bp = getblock(tl, READ); | |
692 | nl = nleft; | |
693 | tl &= ~OFFMSK; | |
694 | while (*lp++ = *bp++) | |
695 | if (--nl == 0) { | |
696 | bp = getblock(tl += INCRMT, READ); | |
697 | nl = nleft; | |
698 | } | |
699 | } | |
700 | ||
701 | int read(); | |
702 | int write(); | |
703 | ||
704 | char * | |
705 | getblock(atl, iof) | |
706 | line atl; | |
707 | int iof; | |
708 | { | |
709 | register int bno, off; | |
710 | ||
711 | bno = (atl >> OFFBTS) & BLKMSK; | |
712 | off = (atl << SHFT) & LBTMSK; | |
713 | if (bno >= NMBLKS) | |
714 | error(" Tmp file too large"); | |
715 | nleft = BUFSIZ - off; | |
716 | if (bno == iblock) { | |
717 | ichanged |= iof; | |
718 | return (ibuff + off); | |
719 | } | |
720 | if (bno == oblock) | |
721 | return (obuff + off); | |
722 | if (iof == READ) { | |
723 | if (ichanged) | |
724 | blkio(iblock, ibuff, write); | |
725 | ichanged = 0; | |
726 | iblock = bno; | |
727 | blkio(bno, ibuff, read); | |
728 | return (ibuff + off); | |
729 | } | |
730 | if (oblock >= 0) | |
731 | blkio(oblock, obuff, write); | |
732 | oblock = bno; | |
733 | return (obuff + off); | |
734 | } | |
735 | ||
736 | blkio(b, buf, iofcn) | |
737 | short b; | |
738 | char *buf; | |
739 | int (*iofcn)(); | |
740 | { | |
741 | ||
742 | lseek(tfile, (long) (unsigned) b * BUFSIZ, 0); | |
44232d5b | 743 | if ((*iofcn)(tfile, buf, BUFSIZ) != BUFSIZ) |
f3270895 MH |
744 | syserror(); |
745 | } | |
746 | ||
747 | syserror() | |
748 | { | |
7af1139d | 749 | char *strerror(); |
f3270895 MH |
750 | |
751 | dirtcnt = 0; | |
752 | write(2, " ", 1); | |
7af1139d | 753 | error(strerror(errno)); |
f3270895 MH |
754 | exit(1); |
755 | } | |
0b7a03e9 KM |
756 | |
757 | /* | |
758 | * Must avoid stdio because expreserve uses sbrk to do memory | |
759 | * allocation and stdio uses malloc. | |
760 | */ | |
761 | fprintf(fp, fmt, a1, a2, a3, a4, a5) | |
762 | FILE *fp; | |
763 | char *fmt; | |
764 | char *a1, *a2, *a3, *a4, *a5; | |
765 | { | |
766 | char buf[BUFSIZ]; | |
767 | ||
768 | if (fp != stderr) | |
769 | return; | |
770 | sprintf(buf, fmt, a1, a2, a3, a4, a5); | |
771 | write(2, buf, strlen(buf)); | |
772 | } |