1 /* $OpenBSD: file.c,v 1.95 2014/04/09 20:50:03 florian Exp $ */ 2 3 /* This file is in the public domain. */ 4 5 /* 6 * File commands. 7 */ 8 9 #include "def.h" 10 11 #include <sys/stat.h> 12 13 #include <libgen.h> 14 15 size_t xdirname(char *, const char *, size_t); 16 17 /* 18 * Insert a file into the current buffer. Real easy - just call the 19 * insertfile routine with the file name. 20 */ 21 /* ARGSUSED */ 22 int 23 fileinsert(int f, int n) 24 { 25 char fname[NFILEN], *bufp, *adjf; 26 27 if (getbufcwd(fname, sizeof(fname)) != TRUE) 28 fname[0] = '\0'; 29 bufp = eread("Insert file: ", fname, NFILEN, 30 EFNEW | EFCR | EFFILE | EFDEF); 31 if (bufp == NULL) 32 return (ABORT); 33 else if (bufp[0] == '\0') 34 return (FALSE); 35 adjf = adjustname(bufp, TRUE); 36 if (adjf == NULL) 37 return (FALSE); 38 return (insertfile(adjf, NULL, FALSE)); 39 } 40 41 /* 42 * Select a file for editing. Look around to see if you can find the file 43 * in another buffer; if you can find it, just switch to the buffer. If 44 * you cannot find the file, create a new buffer, read in the text, and 45 * switch to the new buffer. 46 */ 47 /* ARGSUSED */ 48 int 49 filevisit(int f, int n) 50 { 51 struct buffer *bp; 52 char fname[NFILEN], *bufp, *adjf; 53 int status; 54 55 if (getbufcwd(fname, sizeof(fname)) != TRUE) 56 fname[0] = '\0'; 57 bufp = eread("Find file: ", fname, NFILEN, 58 EFNEW | EFCR | EFFILE | EFDEF); 59 if (bufp == NULL) 60 return (ABORT); 61 else if (bufp[0] == '\0') 62 return (FALSE); 63 adjf = adjustname(fname, TRUE); 64 if (adjf == NULL) 65 return (FALSE); 66 if ((bp = findbuffer(adjf)) == NULL) 67 return (FALSE); 68 curbp = bp; 69 if (showbuffer(bp, curwp, WFFULL) != TRUE) 70 return (FALSE); 71 if (bp->b_fname[0] == '\0') { 72 if ((status = readin(adjf)) != TRUE) 73 killbuffer(bp); 74 return (status); 75 } 76 return (TRUE); 77 } 78 79 /* 80 * Replace the current file with an alternate one. Semantics for finding 81 * the replacement file are the same as 'filevisit', except the current 82 * buffer is killed before the switch. If the kill fails, or is aborted, 83 * revert to the original file. 84 */ 85 /* ARGSUSED */ 86 int 87 filevisitalt(int f, int n) 88 { 89 struct buffer *bp; 90 char fname[NFILEN], *bufp, *adjf; 91 int status; 92 93 if (getbufcwd(fname, sizeof(fname)) != TRUE) 94 fname[0] = '\0'; 95 bufp = eread("Find alternate file: ", fname, NFILEN, 96 EFNEW | EFCR | EFFILE | EFDEF); 97 if (bufp == NULL) 98 return (ABORT); 99 else if (bufp[0] == '\0') 100 return (FALSE); 101 102 status = killbuffer(curbp); 103 if (status == ABORT || status == FALSE) 104 return (ABORT); 105 106 adjf = adjustname(fname, TRUE); 107 if (adjf == NULL) 108 return (FALSE); 109 if ((bp = findbuffer(adjf)) == NULL) 110 return (FALSE); 111 curbp = bp; 112 if (showbuffer(bp, curwp, WFFULL) != TRUE) 113 return (FALSE); 114 if (bp->b_fname[0] == '\0') { 115 if ((status = readin(adjf)) != TRUE) 116 killbuffer(bp); 117 return (status); 118 } 119 return (TRUE); 120 } 121 122 int 123 filevisitro(int f, int n) 124 { 125 int error; 126 127 error = filevisit(f, n); 128 if (error != TRUE) 129 return (error); 130 curbp->b_flag |= BFREADONLY; 131 return (TRUE); 132 } 133 134 /* 135 * Pop to a file in the other window. Same as the last function, but uses 136 * popbuf instead of showbuffer. 137 */ 138 /* ARGSUSED */ 139 int 140 poptofile(int f, int n) 141 { 142 struct buffer *bp; 143 struct mgwin *wp; 144 char fname[NFILEN], *adjf, *bufp; 145 int status; 146 147 if (getbufcwd(fname, sizeof(fname)) != TRUE) 148 fname[0] = '\0'; 149 if ((bufp = eread("Find file in other window: ", fname, NFILEN, 150 EFNEW | EFCR | EFFILE | EFDEF)) == NULL) 151 return (ABORT); 152 else if (bufp[0] == '\0') 153 return (FALSE); 154 adjf = adjustname(fname, TRUE); 155 if (adjf == NULL) 156 return (FALSE); 157 if ((bp = findbuffer(adjf)) == NULL) 158 return (FALSE); 159 if (bp == curbp) 160 return (splitwind(f, n)); 161 if ((wp = popbuf(bp, WNONE)) == NULL) 162 return (FALSE); 163 curbp = bp; 164 curwp = wp; 165 if (bp->b_fname[0] == '\0') { 166 if ((status = readin(adjf)) != TRUE) 167 killbuffer(bp); 168 return (status); 169 } 170 return (TRUE); 171 } 172 173 /* 174 * Read the file "fname" into the current buffer. Make all of the text 175 * in the buffer go away, after checking for unsaved changes. This is 176 * called by the "read" command, the "visit" command, and the mainline 177 * (for "mg file"). 178 */ 179 int 180 readin(char *fname) 181 { 182 struct mgwin *wp; 183 struct stat statbuf; 184 int status, i, ro = FALSE; 185 PF *ael; 186 char dp[NFILEN]; 187 188 /* might be old */ 189 if (bclear(curbp) != TRUE) 190 return (TRUE); 191 /* Clear readonly. May be set by autoexec path */ 192 curbp->b_flag &= ~BFREADONLY; 193 if ((status = insertfile(fname, fname, TRUE)) != TRUE) { 194 dobeep(); 195 ewprintf("File is not readable: %s", fname); 196 return (FALSE); 197 } 198 199 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) { 200 if (wp->w_bufp == curbp) { 201 wp->w_dotp = wp->w_linep = bfirstlp(curbp); 202 wp->w_doto = 0; 203 wp->w_markp = NULL; 204 wp->w_marko = 0; 205 } 206 } 207 208 /* 209 * Call auto-executing function if we need to. 210 */ 211 if ((ael = find_autoexec(fname)) != NULL) { 212 for (i = 0; ael[i] != NULL; i++) 213 (*ael[i])(0, 1); 214 free(ael); 215 } 216 217 /* no change */ 218 curbp->b_flag &= ~BFCHG; 219 220 /* 221 * Set the buffer READONLY flag if any of following are true: 222 * 1. file is a directory. 223 * 2. file is read-only. 224 * 3. file doesn't exist and directory is read-only. 225 */ 226 if (fisdir(fname) == TRUE) { 227 ro = TRUE; 228 } else if ((access(fname, W_OK) == -1)) { 229 if (errno != ENOENT) { 230 ro = TRUE; 231 } else if (errno == ENOENT) { 232 (void)xdirname(dp, fname, sizeof(dp)); 233 (void)strlcat(dp, "/", sizeof(dp)); 234 235 /* Missing directory; keep buffer rw, like emacs */ 236 if (stat(dp, &statbuf) == -1 && errno == ENOENT) { 237 if (eyorn("Missing directory, create") == TRUE) 238 (void)do_makedir(dp); 239 } else if (access(dp, W_OK) == -1 && errno == EACCES) { 240 ewprintf("File not found and directory" 241 " write-protected"); 242 ro = TRUE; 243 } 244 } 245 } 246 if (ro == TRUE) 247 curbp->b_flag |= BFREADONLY; 248 249 if (startrow) { 250 gotoline(FFARG, startrow); 251 startrow = 0; 252 } 253 254 undo_add_modified(); 255 return (status); 256 } 257 258 /* 259 * NB, getting file attributes is done here under control of a flag 260 * rather than in readin, which would be cleaner. I was concerned 261 * that some operating system might require the file to be open 262 * in order to get the information. Similarly for writing. 263 */ 264 265 /* 266 * Insert a file in the current buffer, after dot. If file is a directory, 267 * and 'replacebuf' is TRUE, invoke dired mode, else die with an error. 268 * If file is a regular file, set mark at the end of the text inserted; 269 * point at the beginning. Return a standard status. Print a summary 270 * (lines read, error message) out as well. This routine also does the 271 * read end of backup processing. The BFBAK flag, if set in a buffer, 272 * says that a backup should be taken. It is set when a file is read in, 273 * but not on a new file. You don't need to make a backup copy of nothing. 274 */ 275 276 static char *line = NULL; 277 static int linesize = 0; 278 279 int 280 insertfile(char *fname, char *newname, int replacebuf) 281 { 282 struct buffer *bp; 283 struct line *lp1, *lp2; 284 struct line *olp; /* line we started at */ 285 struct mgwin *wp; 286 int nbytes, s, nline = 0, siz, x, x2; 287 int opos; /* offset we started at */ 288 int oline; /* original line number */ 289 FILE *ffp; 290 291 if (replacebuf == TRUE) 292 x = undo_enable(FFRAND, 0); 293 else 294 x = undo_enabled(); 295 296 lp1 = NULL; 297 if (line == NULL) { 298 line = malloc(NLINE); 299 if (line == NULL) 300 panic("out of memory"); 301 linesize = NLINE; 302 } 303 304 /* cheap */ 305 bp = curbp; 306 if (newname != NULL) { 307 (void)strlcpy(bp->b_fname, newname, sizeof(bp->b_fname)); 308 (void)xdirname(bp->b_cwd, newname, sizeof(bp->b_cwd)); 309 (void)strlcat(bp->b_cwd, "/", sizeof(bp->b_cwd)); 310 } 311 312 /* hard file open */ 313 if ((s = ffropen(&ffp, fname, (replacebuf == TRUE) ? bp : NULL)) 314 == FIOERR) 315 goto out; 316 if (s == FIOFNF) { 317 /* file not found */ 318 if (newname != NULL) 319 ewprintf("(New file)"); 320 else 321 ewprintf("(File not found)"); 322 goto out; 323 } else if (s == FIODIR) { 324 /* file was a directory */ 325 if (replacebuf == FALSE) { 326 dobeep(); 327 ewprintf("Cannot insert: file is a directory, %s", 328 fname); 329 goto cleanup; 330 } 331 killbuffer(bp); 332 bp = dired_(fname); 333 undo_enable(FFRAND, x); 334 if (bp == NULL) 335 return (FALSE); 336 curbp = bp; 337 return (showbuffer(bp, curwp, WFFULL | WFMODE)); 338 } else { 339 (void)xdirname(bp->b_cwd, fname, sizeof(bp->b_cwd)); 340 (void)strlcat(bp->b_cwd, "/", sizeof(bp->b_cwd)); 341 } 342 opos = curwp->w_doto; 343 oline = curwp->w_dotline; 344 /* 345 * Open a new line at dot and start inserting after it. 346 * We will delete this newline after insertion. 347 * Disable undo, as we create the undo record manually. 348 */ 349 x2 = undo_enable(FFRAND, 0); 350 (void)lnewline(); 351 olp = lback(curwp->w_dotp); 352 undo_enable(FFRAND, x2); 353 354 nline = 0; 355 siz = 0; 356 while ((s = ffgetline(ffp, line, linesize, &nbytes)) != FIOERR) { 357 retry: 358 siz += nbytes + 1; 359 switch (s) { 360 case FIOSUC: 361 /* FALLTHRU */ 362 case FIOEOF: 363 ++nline; 364 if ((lp1 = lalloc(nbytes)) == NULL) { 365 /* keep message on the display */ 366 s = FIOERR; 367 undo_add_insert(olp, opos, 368 siz - nbytes - 1 - 1); 369 goto endoffile; 370 } 371 bcopy(line, <ext(lp1)[0], nbytes); 372 lp2 = lback(curwp->w_dotp); 373 lp2->l_fp = lp1; 374 lp1->l_fp = curwp->w_dotp; 375 lp1->l_bp = lp2; 376 curwp->w_dotp->l_bp = lp1; 377 if (s == FIOEOF) { 378 undo_add_insert(olp, opos, siz - 1); 379 goto endoffile; 380 } 381 break; 382 case FIOLONG: { 383 /* a line too long to fit in our buffer */ 384 char *cp; 385 int newsize; 386 387 newsize = linesize * 2; 388 if (newsize < 0 || 389 (cp = malloc(newsize)) == NULL) { 390 dobeep(); 391 ewprintf("Could not allocate %d bytes", 392 newsize); 393 s = FIOERR; 394 goto endoffile; 395 } 396 bcopy(line, cp, linesize); 397 free(line); 398 line = cp; 399 s = ffgetline(ffp, line + linesize, linesize, 400 &nbytes); 401 nbytes += linesize; 402 linesize = newsize; 403 if (s == FIOERR) 404 goto endoffile; 405 goto retry; 406 } 407 default: 408 dobeep(); 409 ewprintf("Unknown code %d reading file", s); 410 s = FIOERR; 411 break; 412 } 413 } 414 endoffile: 415 /* ignore errors */ 416 (void)ffclose(ffp, NULL); 417 /* don't zap an error */ 418 if (s == FIOEOF) { 419 if (nline == 1) 420 ewprintf("(Read 1 line)"); 421 else 422 ewprintf("(Read %d lines)", nline); 423 } 424 /* set mark at the end of the text */ 425 curwp->w_dotp = curwp->w_markp = lback(curwp->w_dotp); 426 curwp->w_marko = llength(curwp->w_markp); 427 curwp->w_markline = oline + nline + 1; 428 /* 429 * if we are at the end of the file, ldelnewline is a no-op, 430 * but we still need to decrement the line and markline counts 431 * as we've accounted for this fencepost in our arithmetic 432 */ 433 if (lforw(curwp->w_dotp) == curwp->w_bufp->b_headp) { 434 curwp->w_bufp->b_lines--; 435 curwp->w_markline--; 436 } else 437 (void)ldelnewline(); 438 curwp->w_dotp = olp; 439 curwp->w_doto = opos; 440 curwp->w_dotline = oline; 441 if (olp == curbp->b_headp) 442 curwp->w_dotp = lforw(olp); 443 if (newname != NULL) 444 bp->b_flag |= BFCHG | BFBAK; /* Need a backup. */ 445 else 446 bp->b_flag |= BFCHG; 447 /* 448 * If the insert was at the end of buffer, set lp1 to the end of 449 * buffer line, and lp2 to the beginning of the newly inserted text. 450 * (Otherwise lp2 is set to NULL.) This is used below to set 451 * pointers in other windows correctly if they are also at the end of 452 * buffer. 453 */ 454 lp1 = bp->b_headp; 455 if (curwp->w_markp == lp1) { 456 lp2 = curwp->w_dotp; 457 } else { 458 /* delete extraneous newline */ 459 (void)ldelnewline(); 460 out: lp2 = NULL; 461 } 462 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) { 463 if (wp->w_bufp == curbp) { 464 wp->w_rflag |= WFMODE | WFEDIT; 465 if (wp != curwp && lp2 != NULL) { 466 if (wp->w_dotp == lp1) 467 wp->w_dotp = lp2; 468 if (wp->w_markp == lp1) 469 wp->w_markp = lp2; 470 if (wp->w_linep == lp1) 471 wp->w_linep = lp2; 472 } 473 } 474 } 475 bp->b_lines += nline; 476 cleanup: 477 undo_enable(FFRAND, x); 478 479 /* return FALSE if error */ 480 return (s != FIOERR); 481 } 482 483 /* 484 * Ask for a file name and write the contents of the current buffer to that 485 * file. Update the remembered file name and clear the buffer changed flag. 486 * This handling of file names is different from the earlier versions and 487 * is more compatible with Gosling EMACS than with ITS EMACS. 488 */ 489 /* ARGSUSED */ 490 int 491 filewrite(int f, int n) 492 { 493 struct stat statbuf; 494 int s; 495 char fname[NFILEN], bn[NBUFN], tmp[NFILEN + 25]; 496 char *adjfname, *bufp; 497 FILE *ffp; 498 499 if (getbufcwd(fname, sizeof(fname)) != TRUE) 500 fname[0] = '\0'; 501 if ((bufp = eread("Write file: ", fname, NFILEN, 502 EFDEF | EFNEW | EFCR | EFFILE)) == NULL) 503 return (ABORT); 504 else if (bufp[0] == '\0') 505 return (FALSE); 506 507 adjfname = adjustname(fname, TRUE); 508 if (adjfname == NULL) 509 return (FALSE); 510 511 /* Check if file exists; write checks done later */ 512 if (stat(adjfname, &statbuf) == 0) { 513 if (S_ISDIR(statbuf.st_mode)) { 514 dobeep(); 515 ewprintf("%s is a directory", adjfname); 516 return (FALSE); 517 } 518 snprintf(tmp, sizeof(tmp), "File `%s' exists; overwrite", 519 adjfname); 520 if ((s = eyorn(tmp)) != TRUE) 521 return (s); 522 } 523 524 /* old attributes are no longer current */ 525 bzero(&curbp->b_fi, sizeof(curbp->b_fi)); 526 if ((s = writeout(&ffp, curbp, adjfname)) == TRUE) { 527 (void)strlcpy(curbp->b_fname, adjfname, sizeof(curbp->b_fname)); 528 if (getbufcwd(curbp->b_cwd, sizeof(curbp->b_cwd)) != TRUE) 529 (void)strlcpy(curbp->b_cwd, "/", sizeof(curbp->b_cwd)); 530 if (augbname(bn, curbp->b_fname, sizeof(bn)) 531 == FALSE) 532 return (FALSE); 533 free(curbp->b_bname); 534 if ((curbp->b_bname = strdup(bn)) == NULL) 535 return (FALSE); 536 (void)fupdstat(curbp); 537 curbp->b_flag &= ~(BFBAK | BFCHG); 538 upmodes(curbp); 539 undo_add_boundary(FFRAND, 1); 540 undo_add_modified(); 541 } 542 return (s); 543 } 544 545 /* 546 * Save the contents of the current buffer back into its associated file. 547 */ 548 #ifndef MAKEBACKUP 549 #define MAKEBACKUP TRUE 550 #endif /* !MAKEBACKUP */ 551 static int makebackup = MAKEBACKUP; 552 553 /* ARGSUSED */ 554 int 555 filesave(int f, int n) 556 { 557 if (curbp->b_fname[0] == '\0') 558 return (filewrite(f, n)); 559 else 560 return (buffsave(curbp)); 561 } 562 563 /* 564 * Save the contents of the buffer argument into its associated file. Do 565 * nothing if there have been no changes (is this a bug, or a feature?). 566 * Error if there is no remembered file name. If this is the first write 567 * since the read or visit, then a backup copy of the file is made. 568 * Allow user to select whether or not to make backup files by looking at 569 * the value of makebackup. 570 */ 571 int 572 buffsave(struct buffer *bp) 573 { 574 int s; 575 FILE *ffp; 576 577 /* return, no changes */ 578 if ((bp->b_flag & BFCHG) == 0) { 579 ewprintf("(No changes need to be saved)"); 580 return (TRUE); 581 } 582 583 /* must have a name */ 584 if (bp->b_fname[0] == '\0') { 585 dobeep(); 586 ewprintf("No file name"); 587 return (FALSE); 588 } 589 590 /* Ensure file has not been modified elsewhere */ 591 /* We don't use the ignore flag here */ 592 if (fchecktime(bp) != TRUE) { 593 if ((s = eyesno("File has changed on disk since last save. " 594 "Save anyway")) != TRUE) 595 return (s); 596 } 597 598 if (makebackup && (bp->b_flag & BFBAK)) { 599 s = fbackupfile(bp->b_fname); 600 /* hard error */ 601 if (s == ABORT) 602 return (FALSE); 603 /* softer error */ 604 if (s == FALSE && 605 (s = eyesno("Backup error, save anyway")) != TRUE) 606 return (s); 607 } 608 if ((s = writeout(&ffp, bp, bp->b_fname)) == TRUE) { 609 (void)fupdstat(bp); 610 bp->b_flag &= ~(BFCHG | BFBAK); 611 upmodes(bp); 612 undo_add_boundary(FFRAND, 1); 613 undo_add_modified(); 614 } 615 return (s); 616 } 617 618 /* 619 * Since we don't have variables (we probably should) this is a command 620 * processor for changing the value of the make backup flag. If no argument 621 * is given, sets makebackup to true, so backups are made. If an argument is 622 * given, no backup files are made when saving a new version of a file. 623 */ 624 /* ARGSUSED */ 625 int 626 makebkfile(int f, int n) 627 { 628 if (f & FFARG) 629 makebackup = n > 0; 630 else 631 makebackup = !makebackup; 632 ewprintf("Backup files %sabled", makebackup ? "en" : "dis"); 633 return (TRUE); 634 } 635 636 /* 637 * NB: bp is passed to both ffwopen and ffclose because some 638 * attribute information may need to be updated at open time 639 * and others after the close. This is OS-dependent. Note 640 * that the ff routines are assumed to be able to tell whether 641 * the attribute information has been set up in this buffer 642 * or not. 643 */ 644 645 /* 646 * This function performs the details of file writing; writing the file 647 * in buffer bp to file fn. Uses the file management routines in the 648 * "fileio.c" package. Most of the grief is checking of some sort. 649 * You may want to call fupdstat() after using this function. 650 */ 651 int 652 writeout(FILE ** ffp, struct buffer *bp, char *fn) 653 { 654 struct stat statbuf; 655 int s; 656 char dp[NFILEN]; 657 658 if (stat(fn, &statbuf) == -1 && errno == ENOENT) { 659 errno = 0; 660 (void)xdirname(dp, fn, sizeof(dp)); 661 (void)strlcat(dp, "/", sizeof(dp)); 662 if (access(dp, W_OK) && errno == EACCES) { 663 dobeep(); 664 ewprintf("Directory %s write-protected", dp); 665 return (FIOERR); 666 } else if (errno == ENOENT) { 667 dobeep(); 668 ewprintf("%s: no such directory", dp); 669 return (FIOERR); 670 } 671 } 672 /* open writes message */ 673 if ((s = ffwopen(ffp, fn, bp)) != FIOSUC) 674 return (FALSE); 675 s = ffputbuf(*ffp, bp); 676 if (s == FIOSUC) { 677 /* no write error */ 678 s = ffclose(*ffp, bp); 679 if (s == FIOSUC) 680 ewprintf("Wrote %s", fn); 681 } else { 682 /* print a message indicating write error */ 683 (void)ffclose(*ffp, bp); 684 dobeep(); 685 ewprintf("Unable to write %s", fn); 686 } 687 return (s == FIOSUC); 688 } 689 690 /* 691 * Tag all windows for bp (all windows if bp == NULL) as needing their 692 * mode line updated. 693 */ 694 void 695 upmodes(struct buffer *bp) 696 { 697 struct mgwin *wp; 698 699 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) 700 if (bp == NULL || curwp->w_bufp == bp) 701 wp->w_rflag |= WFMODE; 702 } 703 704 /* 705 * dirname using strlcpy semantic. 706 * Like dirname() except an empty string is returned in 707 * place of "/". This means we can always add a trailing 708 * slash and be correct. 709 * Address portability issues by copying argument 710 * before using. Some implementations modify the input string. 711 */ 712 size_t 713 xdirname(char *dp, const char *path, size_t dplen) 714 { 715 char ts[NFILEN]; 716 size_t len; 717 718 (void)strlcpy(ts, path, NFILEN); 719 len = strlcpy(dp, dirname(ts), dplen); 720 if (dplen > 0 && dp[0] == '/' && dp[1] == '\0') { 721 dp[0] = '\0'; 722 len = 0; 723 } 724 return (len); 725 } 726 727 /* 728 * basename using strlcpy/strlcat semantic. 729 * Address portability issue by copying argument 730 * before using: some implementations modify the input string. 731 */ 732 size_t 733 xbasename(char *bp, const char *path, size_t bplen) 734 { 735 char ts[NFILEN]; 736 737 (void)strlcpy(ts, path, NFILEN); 738 return (strlcpy(bp, basename(ts), bplen)); 739 } 740