1 /* 2 * Copyright (C) 1984-2008 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information about less, or for information on how to 8 * contact the author, see the README file. 9 */ 10 11 12 /* 13 * Routines to mess around with filenames (and files). 14 * Much of this is very OS dependent. 15 */ 16 17 #include "less.h" 18 #include "lglob.h" 19 #if MSDOS_COMPILER 20 #include <dos.h> 21 #if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER) 22 #include <dir.h> 23 #endif 24 #if MSDOS_COMPILER==DJGPPC 25 #include <glob.h> 26 #include <dir.h> 27 #define _MAX_PATH PATH_MAX 28 #endif 29 #endif 30 #ifdef _OSK 31 #include <rbf.h> 32 #ifndef _OSK_MWC32 33 #include <modes.h> 34 #endif 35 #endif 36 #if OS2 37 #include <signal.h> 38 #endif 39 40 #if HAVE_STAT 41 #include <sys/stat.h> 42 #ifndef S_ISDIR 43 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) 44 #endif 45 #ifndef S_ISREG 46 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) 47 #endif 48 #endif 49 50 51 extern int force_open; 52 extern int secure; 53 extern int use_lessopen; 54 extern int ctldisp; 55 extern int utf_mode; 56 extern IFILE curr_ifile; 57 extern IFILE old_ifile; 58 #if SPACES_IN_FILENAMES 59 extern char openquote; 60 extern char closequote; 61 #endif 62 63 /* 64 * Remove quotes around a filename. 65 */ 66 public char * 67 shell_unquote(str) 68 char *str; 69 { 70 char *name; 71 char *p; 72 73 name = p = (char *) ecalloc(strlen(str)+1, sizeof(char)); 74 if (*str == openquote) 75 { 76 str++; 77 while (*str != '\0') 78 { 79 if (*str == closequote) 80 { 81 if (str[1] != closequote) 82 break; 83 str++; 84 } 85 *p++ = *str++; 86 } 87 } else 88 { 89 char *esc = get_meta_escape(); 90 int esclen = strlen(esc); 91 while (*str != '\0') 92 { 93 if (esclen > 0 && strncmp(str, esc, esclen) == 0) 94 str += esclen; 95 *p++ = *str++; 96 } 97 } 98 *p = '\0'; 99 return (name); 100 } 101 102 /* 103 * Get the shell's escape character. 104 */ 105 public char * 106 get_meta_escape() 107 { 108 char *s; 109 110 s = lgetenv("LESSMETAESCAPE"); 111 if (s == NULL) 112 s = DEF_METAESCAPE; 113 return (s); 114 } 115 116 /* 117 * Get the characters which the shell considers to be "metacharacters". 118 */ 119 static char * 120 metachars() 121 { 122 static char *mchars = NULL; 123 124 if (mchars == NULL) 125 { 126 mchars = lgetenv("LESSMETACHARS"); 127 if (mchars == NULL) 128 mchars = DEF_METACHARS; 129 } 130 return (mchars); 131 } 132 133 /* 134 * Is this a shell metacharacter? 135 */ 136 static int 137 metachar(c) 138 char c; 139 { 140 return (strchr(metachars(), c) != NULL); 141 } 142 143 /* 144 * Insert a backslash before each metacharacter in a string. 145 */ 146 public char * 147 shell_quote(s) 148 char *s; 149 { 150 char *p; 151 char *newstr; 152 int len; 153 char *esc = get_meta_escape(); 154 int esclen = strlen(esc); 155 int use_quotes = 0; 156 int have_quotes = 0; 157 158 /* 159 * Determine how big a string we need to allocate. 160 */ 161 len = 1; /* Trailing null byte */ 162 for (p = s; *p != '\0'; p++) 163 { 164 len++; 165 if (*p == openquote || *p == closequote) 166 have_quotes = 1; 167 if (metachar(*p)) 168 { 169 if (esclen == 0) 170 { 171 /* 172 * We've got a metachar, but this shell 173 * doesn't support escape chars. Use quotes. 174 */ 175 use_quotes = 1; 176 } else 177 { 178 /* 179 * Allow space for the escape char. 180 */ 181 len += esclen; 182 } 183 } 184 } 185 if (use_quotes) 186 { 187 if (have_quotes) 188 /* 189 * We can't quote a string that contains quotes. 190 */ 191 return (NULL); 192 len = strlen(s) + 3; 193 } 194 /* 195 * Allocate and construct the new string. 196 */ 197 newstr = p = (char *) ecalloc(len, sizeof(char)); 198 if (use_quotes) 199 { 200 SNPRINTF3(newstr, len, "%c%s%c", openquote, s, closequote); 201 } else 202 { 203 while (*s != '\0') 204 { 205 if (metachar(*s)) 206 { 207 /* 208 * Add the escape char. 209 */ 210 strcpy(p, esc); 211 p += esclen; 212 } 213 *p++ = *s++; 214 } 215 *p = '\0'; 216 } 217 return (newstr); 218 } 219 220 /* 221 * Return a pathname that points to a specified file in a specified directory. 222 * Return NULL if the file does not exist in the directory. 223 */ 224 static char * 225 dirfile(dirname, filename) 226 char *dirname; 227 char *filename; 228 { 229 char *pathname; 230 char *qpathname; 231 int len; 232 int f; 233 234 if (dirname == NULL || *dirname == '\0') 235 return (NULL); 236 /* 237 * Construct the full pathname. 238 */ 239 len= strlen(dirname) + strlen(filename) + 2; 240 pathname = (char *) calloc(len, sizeof(char)); 241 if (pathname == NULL) 242 return (NULL); 243 SNPRINTF3(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename); 244 /* 245 * Make sure the file exists. 246 */ 247 qpathname = shell_unquote(pathname); 248 f = open(qpathname, OPEN_READ); 249 if (f < 0) 250 { 251 free(pathname); 252 pathname = NULL; 253 } else 254 { 255 close(f); 256 } 257 free(qpathname); 258 return (pathname); 259 } 260 261 /* 262 * Return the full pathname of the given file in the "home directory". 263 */ 264 public char * 265 homefile(filename) 266 char *filename; 267 { 268 register char *pathname; 269 270 /* 271 * Try $HOME/filename. 272 */ 273 pathname = dirfile(lgetenv("HOME"), filename); 274 if (pathname != NULL) 275 return (pathname); 276 #if OS2 277 /* 278 * Try $INIT/filename. 279 */ 280 pathname = dirfile(lgetenv("INIT"), filename); 281 if (pathname != NULL) 282 return (pathname); 283 #endif 284 #if MSDOS_COMPILER || OS2 285 /* 286 * Look for the file anywhere on search path. 287 */ 288 pathname = (char *) calloc(_MAX_PATH, sizeof(char)); 289 #if MSDOS_COMPILER==DJGPPC 290 { 291 char *res = searchpath(filename); 292 if (res == 0) 293 *pathname = '\0'; 294 else 295 strcpy(pathname, res); 296 } 297 #else 298 _searchenv(filename, "PATH", pathname); 299 #endif 300 if (*pathname != '\0') 301 return (pathname); 302 free(pathname); 303 #endif 304 return (NULL); 305 } 306 307 /* 308 * Expand a string, substituting any "%" with the current filename, 309 * and any "#" with the previous filename. 310 * But a string of N "%"s is just replaced with N-1 "%"s. 311 * Likewise for a string of N "#"s. 312 * {{ This is a lot of work just to support % and #. }} 313 */ 314 public char * 315 fexpand(s) 316 char *s; 317 { 318 register char *fr, *to; 319 register int n; 320 register char *e; 321 IFILE ifile; 322 323 #define fchar_ifile(c) \ 324 ((c) == '%' ? curr_ifile : \ 325 (c) == '#' ? old_ifile : NULL_IFILE) 326 327 /* 328 * Make one pass to see how big a buffer we 329 * need to allocate for the expanded string. 330 */ 331 n = 0; 332 for (fr = s; *fr != '\0'; fr++) 333 { 334 switch (*fr) 335 { 336 case '%': 337 case '#': 338 if (fr > s && fr[-1] == *fr) 339 { 340 /* 341 * Second (or later) char in a string 342 * of identical chars. Treat as normal. 343 */ 344 n++; 345 } else if (fr[1] != *fr) 346 { 347 /* 348 * Single char (not repeated). Treat specially. 349 */ 350 ifile = fchar_ifile(*fr); 351 if (ifile == NULL_IFILE) 352 n++; 353 else 354 n += strlen(get_filename(ifile)); 355 } 356 /* 357 * Else it is the first char in a string of 358 * identical chars. Just discard it. 359 */ 360 break; 361 default: 362 n++; 363 break; 364 } 365 } 366 367 e = (char *) ecalloc(n+1, sizeof(char)); 368 369 /* 370 * Now copy the string, expanding any "%" or "#". 371 */ 372 to = e; 373 for (fr = s; *fr != '\0'; fr++) 374 { 375 switch (*fr) 376 { 377 case '%': 378 case '#': 379 if (fr > s && fr[-1] == *fr) 380 { 381 *to++ = *fr; 382 } else if (fr[1] != *fr) 383 { 384 ifile = fchar_ifile(*fr); 385 if (ifile == NULL_IFILE) 386 *to++ = *fr; 387 else 388 { 389 strcpy(to, get_filename(ifile)); 390 to += strlen(to); 391 } 392 } 393 break; 394 default: 395 *to++ = *fr; 396 break; 397 } 398 } 399 *to = '\0'; 400 return (e); 401 } 402 403 #if TAB_COMPLETE_FILENAME 404 405 /* 406 * Return a blank-separated list of filenames which "complete" 407 * the given string. 408 */ 409 public char * 410 fcomplete(s) 411 char *s; 412 { 413 char *fpat; 414 char *qs; 415 416 if (secure) 417 return (NULL); 418 /* 419 * Complete the filename "s" by globbing "s*". 420 */ 421 #if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC) 422 /* 423 * But in DOS, we have to glob "s*.*". 424 * But if the final component of the filename already has 425 * a dot in it, just do "s*". 426 * (Thus, "FILE" is globbed as "FILE*.*", 427 * but "FILE.A" is globbed as "FILE.A*"). 428 */ 429 { 430 char *slash; 431 int len; 432 for (slash = s+strlen(s)-1; slash > s; slash--) 433 if (*slash == *PATHNAME_SEP || *slash == '/') 434 break; 435 len = strlen(s) + 4; 436 fpat = (char *) ecalloc(len, sizeof(char)); 437 if (strchr(slash, '.') == NULL) 438 SNPRINTF1(fpat, len, "%s*.*", s); 439 else 440 SNPRINTF1(fpat, len, "%s*", s); 441 } 442 #else 443 { 444 int len = strlen(s) + 2; 445 fpat = (char *) ecalloc(len, sizeof(char)); 446 SNPRINTF1(fpat, len, "%s*", s); 447 } 448 #endif 449 qs = lglob(fpat); 450 s = shell_unquote(qs); 451 if (strcmp(s,fpat) == 0) 452 { 453 /* 454 * The filename didn't expand. 455 */ 456 free(qs); 457 qs = NULL; 458 } 459 free(s); 460 free(fpat); 461 return (qs); 462 } 463 #endif 464 465 /* 466 * Try to determine if a file is "binary". 467 * This is just a guess, and we need not try too hard to make it accurate. 468 */ 469 public int 470 bin_file(f) 471 int f; 472 { 473 int n; 474 int bin_count = 0; 475 char data[256]; 476 char* p; 477 char* pend; 478 479 if (!seekable(f)) 480 return (0); 481 if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK) 482 return (0); 483 n = read(f, data, sizeof(data)); 484 pend = &data[n]; 485 for (p = data; p < pend; ) 486 { 487 LWCHAR c = step_char(&p, +1, pend); 488 if (ctldisp == OPT_ONPLUS && IS_CSI_START(c)) 489 { 490 do { 491 c = step_char(&p, +1, pend); 492 } while (p < pend && is_ansi_middle(c)); 493 } else if (binary_char(c)) 494 bin_count++; 495 } 496 /* 497 * Call it a binary file if there are more than 5 binary characters 498 * in the first 256 bytes of the file. 499 */ 500 return (bin_count > 5); 501 } 502 503 /* 504 * Try to determine the size of a file by seeking to the end. 505 */ 506 static POSITION 507 seek_filesize(f) 508 int f; 509 { 510 off_t spos; 511 512 spos = lseek(f, (off_t)0, SEEK_END); 513 if (spos == BAD_LSEEK) 514 return (NULL_POSITION); 515 return ((POSITION) spos); 516 } 517 518 /* 519 * Read a string from a file. 520 * Return a pointer to the string in memory. 521 */ 522 static char * 523 readfd(fd) 524 FILE *fd; 525 { 526 int len; 527 int ch; 528 char *buf; 529 char *p; 530 531 /* 532 * Make a guess about how many chars in the string 533 * and allocate a buffer to hold it. 534 */ 535 len = 100; 536 buf = (char *) ecalloc(len, sizeof(char)); 537 for (p = buf; ; p++) 538 { 539 if ((ch = getc(fd)) == '\n' || ch == EOF) 540 break; 541 if (p - buf >= len-1) 542 { 543 /* 544 * The string is too big to fit in the buffer we have. 545 * Allocate a new buffer, twice as big. 546 */ 547 len *= 2; 548 *p = '\0'; 549 p = (char *) ecalloc(len, sizeof(char)); 550 strcpy(p, buf); 551 free(buf); 552 buf = p; 553 p = buf + strlen(buf); 554 } 555 *p = ch; 556 } 557 *p = '\0'; 558 return (buf); 559 } 560 561 562 563 #if HAVE_POPEN 564 565 FILE *popen(); 566 567 /* 568 * Execute a shell command. 569 * Return a pointer to a pipe connected to the shell command's standard output. 570 */ 571 static FILE * 572 shellcmd(cmd) 573 char *cmd; 574 { 575 FILE *fd; 576 577 #if HAVE_SHELL 578 char *shell; 579 580 shell = lgetenv("SHELL"); 581 if (shell != NULL && *shell != '\0') 582 { 583 char *scmd; 584 char *esccmd; 585 586 /* 587 * Read the output of <$SHELL -c cmd>. 588 * Escape any metacharacters in the command. 589 */ 590 esccmd = shell_quote(cmd); 591 if (esccmd == NULL) 592 { 593 fd = popen(cmd, "r"); 594 } else 595 { 596 int len = strlen(shell) + strlen(esccmd) + 5; 597 scmd = (char *) ecalloc(len, sizeof(char)); 598 SNPRINTF3(scmd, len, "%s %s %s", shell, shell_coption(), esccmd); 599 free(esccmd); 600 fd = popen(scmd, "r"); 601 free(scmd); 602 } 603 } else 604 #endif 605 { 606 fd = popen(cmd, "r"); 607 } 608 /* 609 * Redirection in `popen' might have messed with the 610 * standard devices. Restore binary input mode. 611 */ 612 SET_BINARY(0); 613 return (fd); 614 } 615 616 #endif /* HAVE_POPEN */ 617 618 619 /* 620 * Expand a filename, doing any system-specific metacharacter substitutions. 621 */ 622 public char * 623 lglob(filename) 624 char *filename; 625 { 626 char *gfilename; 627 char *ofilename; 628 629 ofilename = fexpand(filename); 630 if (secure) 631 return (ofilename); 632 filename = shell_unquote(ofilename); 633 634 #ifdef DECL_GLOB_LIST 635 { 636 /* 637 * The globbing function returns a list of names. 638 */ 639 int length; 640 char *p; 641 char *qfilename; 642 DECL_GLOB_LIST(list) 643 644 GLOB_LIST(filename, list); 645 if (GLOB_LIST_FAILED(list)) 646 { 647 free(filename); 648 return (ofilename); 649 } 650 length = 1; /* Room for trailing null byte */ 651 for (SCAN_GLOB_LIST(list, p)) 652 { 653 INIT_GLOB_LIST(list, p); 654 qfilename = shell_quote(p); 655 if (qfilename != NULL) 656 { 657 length += strlen(qfilename) + 1; 658 free(qfilename); 659 } 660 } 661 gfilename = (char *) ecalloc(length, sizeof(char)); 662 for (SCAN_GLOB_LIST(list, p)) 663 { 664 INIT_GLOB_LIST(list, p); 665 qfilename = shell_quote(p); 666 if (qfilename != NULL) 667 { 668 sprintf(gfilename + strlen(gfilename), "%s ", qfilename); 669 free(qfilename); 670 } 671 } 672 /* 673 * Overwrite the final trailing space with a null terminator. 674 */ 675 *--p = '\0'; 676 GLOB_LIST_DONE(list); 677 } 678 #else 679 #ifdef DECL_GLOB_NAME 680 { 681 /* 682 * The globbing function returns a single name, and 683 * is called multiple times to walk thru all names. 684 */ 685 register char *p; 686 register int len; 687 register int n; 688 char *pathname; 689 char *qpathname; 690 DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle) 691 692 GLOB_FIRST_NAME(filename, &fnd, handle); 693 if (GLOB_FIRST_FAILED(handle)) 694 { 695 free(filename); 696 return (ofilename); 697 } 698 699 _splitpath(filename, drive, dir, fname, ext); 700 len = 100; 701 gfilename = (char *) ecalloc(len, sizeof(char)); 702 p = gfilename; 703 do { 704 n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1; 705 pathname = (char *) ecalloc(n, sizeof(char)); 706 SNPRINTF3(pathname, n, "%s%s%s", drive, dir, fnd.GLOB_NAME); 707 qpathname = shell_quote(pathname); 708 free(pathname); 709 if (qpathname != NULL) 710 { 711 n = strlen(qpathname); 712 while (p - gfilename + n + 2 >= len) 713 { 714 /* 715 * No room in current buffer. 716 * Allocate a bigger one. 717 */ 718 len *= 2; 719 *p = '\0'; 720 p = (char *) ecalloc(len, sizeof(char)); 721 strcpy(p, gfilename); 722 free(gfilename); 723 gfilename = p; 724 p = gfilename + strlen(gfilename); 725 } 726 strcpy(p, qpathname); 727 free(qpathname); 728 p += n; 729 *p++ = ' '; 730 } 731 } while (GLOB_NEXT_NAME(handle, &fnd) == 0); 732 733 /* 734 * Overwrite the final trailing space with a null terminator. 735 */ 736 *--p = '\0'; 737 GLOB_NAME_DONE(handle); 738 } 739 #else 740 #if HAVE_POPEN 741 { 742 /* 743 * We get the shell to glob the filename for us by passing 744 * an "echo" command to the shell and reading its output. 745 */ 746 FILE *fd; 747 char *s; 748 char *lessecho; 749 char *cmd; 750 char *esc; 751 int len; 752 753 esc = get_meta_escape(); 754 if (strlen(esc) == 0) 755 esc = "-"; 756 esc = shell_quote(esc); 757 if (esc == NULL) 758 { 759 free(filename); 760 return (ofilename); 761 } 762 lessecho = lgetenv("LESSECHO"); 763 if (lessecho == NULL || *lessecho == '\0') 764 lessecho = "lessecho"; 765 /* 766 * Invoke lessecho, and read its output (a globbed list of filenames). 767 */ 768 len = strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24; 769 cmd = (char *) ecalloc(len, sizeof(char)); 770 SNPRINTF4(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, closequote, esc); 771 free(esc); 772 for (s = metachars(); *s != '\0'; s++) 773 sprintf(cmd + strlen(cmd), "-n0x%x ", *s); 774 sprintf(cmd + strlen(cmd), "-- %s", ofilename); 775 fd = shellcmd(cmd); 776 free(cmd); 777 if (fd == NULL) 778 { 779 /* 780 * Cannot create the pipe. 781 * Just return the original (fexpanded) filename. 782 */ 783 free(filename); 784 return (ofilename); 785 } 786 gfilename = readfd(fd); 787 pclose(fd); 788 if (*gfilename == '\0') 789 { 790 free(gfilename); 791 free(filename); 792 return (ofilename); 793 } 794 } 795 #else 796 /* 797 * No globbing functions at all. Just use the fexpanded filename. 798 */ 799 gfilename = save(filename); 800 #endif 801 #endif 802 #endif 803 free(filename); 804 free(ofilename); 805 return (gfilename); 806 } 807 808 /* 809 * See if we should open a "replacement file" 810 * instead of the file we're about to open. 811 */ 812 public char * 813 open_altfile(filename, pf, pfd) 814 char *filename; 815 int *pf; 816 void **pfd; 817 { 818 #if !HAVE_POPEN 819 return (NULL); 820 #else 821 char *lessopen; 822 char *cmd; 823 int len; 824 FILE *fd; 825 #if HAVE_FILENO 826 int returnfd = 0; 827 #endif 828 829 if (!use_lessopen || secure) 830 return (NULL); 831 ch_ungetchar(-1); 832 if ((lessopen = lgetenv("LESSOPEN")) == NULL) 833 return (NULL); 834 if (*lessopen == '|') 835 { 836 /* 837 * If LESSOPEN starts with a |, it indicates 838 * a "pipe preprocessor". 839 */ 840 #if !HAVE_FILENO 841 error("LESSOPEN pipe is not supported", NULL_PARG); 842 return (NULL); 843 #else 844 lessopen++; 845 returnfd = 1; 846 if (*lessopen == '-') { 847 /* 848 * Lessopen preprocessor will accept "-" as a filename. 849 */ 850 lessopen++; 851 } else { 852 if (strcmp(filename, "-") == 0) 853 return (NULL); 854 } 855 #endif 856 } 857 858 len = strlen(lessopen) + strlen(filename) + 2; 859 cmd = (char *) ecalloc(len, sizeof(char)); 860 SNPRINTF1(cmd, len, lessopen, filename); 861 fd = shellcmd(cmd); 862 free(cmd); 863 if (fd == NULL) 864 { 865 /* 866 * Cannot create the pipe. 867 */ 868 return (NULL); 869 } 870 #if HAVE_FILENO 871 if (returnfd) 872 { 873 int f; 874 char c; 875 876 /* 877 * Read one char to see if the pipe will produce any data. 878 * If it does, push the char back on the pipe. 879 */ 880 f = fileno(fd); 881 SET_BINARY(f); 882 if (read(f, &c, 1) != 1) 883 { 884 /* 885 * Pipe is empty. This means there is no alt file. 886 */ 887 pclose(fd); 888 return (NULL); 889 } 890 ch_ungetchar(c); 891 *pfd = (void *) fd; 892 *pf = f; 893 return (save("-")); 894 } 895 #endif 896 cmd = readfd(fd); 897 pclose(fd); 898 if (*cmd == '\0') 899 /* 900 * Pipe is empty. This means there is no alt file. 901 */ 902 return (NULL); 903 return (cmd); 904 #endif /* HAVE_POPEN */ 905 } 906 907 /* 908 * Close a replacement file. 909 */ 910 public void 911 close_altfile(altfilename, filename, pipefd) 912 char *altfilename; 913 char *filename; 914 void *pipefd; 915 { 916 #if HAVE_POPEN 917 char *lessclose; 918 FILE *fd; 919 char *cmd; 920 int len; 921 922 if (secure) 923 return; 924 if (pipefd != NULL) 925 { 926 #if OS2 927 /* 928 * The pclose function of OS/2 emx sometimes fails. 929 * Send SIGINT to the piped process before closing it. 930 */ 931 kill(((FILE*)pipefd)->_pid, SIGINT); 932 #endif 933 pclose((FILE*) pipefd); 934 } 935 if ((lessclose = lgetenv("LESSCLOSE")) == NULL) 936 return; 937 len = strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2; 938 cmd = (char *) ecalloc(len, sizeof(char)); 939 SNPRINTF2(cmd, len, lessclose, filename, altfilename); 940 fd = shellcmd(cmd); 941 free(cmd); 942 if (fd != NULL) 943 pclose(fd); 944 #endif 945 } 946 947 /* 948 * Is the specified file a directory? 949 */ 950 public int 951 is_dir(filename) 952 char *filename; 953 { 954 int isdir = 0; 955 956 filename = shell_unquote(filename); 957 #if HAVE_STAT 958 { 959 int r; 960 struct stat statbuf; 961 962 r = stat(filename, &statbuf); 963 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode)); 964 } 965 #else 966 #ifdef _OSK 967 { 968 register int f; 969 970 f = open(filename, S_IREAD | S_IFDIR); 971 if (f >= 0) 972 close(f); 973 isdir = (f >= 0); 974 } 975 #endif 976 #endif 977 free(filename); 978 return (isdir); 979 } 980 981 /* 982 * Returns NULL if the file can be opened and 983 * is an ordinary file, otherwise an error message 984 * (if it cannot be opened or is a directory, etc.) 985 */ 986 public char * 987 bad_file(filename) 988 char *filename; 989 { 990 register char *m = NULL; 991 992 filename = shell_unquote(filename); 993 if (!force_open && is_dir(filename)) 994 { 995 static char is_a_dir[] = " is a directory"; 996 997 m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir), 998 sizeof(char)); 999 strcpy(m, filename); 1000 strcat(m, is_a_dir); 1001 } else 1002 { 1003 #if HAVE_STAT 1004 int r; 1005 struct stat statbuf; 1006 1007 r = stat(filename, &statbuf); 1008 if (r < 0) 1009 { 1010 m = errno_message(filename); 1011 } else if (force_open) 1012 { 1013 m = NULL; 1014 } else if (!S_ISREG(statbuf.st_mode)) 1015 { 1016 static char not_reg[] = " is not a regular file (use -f to see it)"; 1017 m = (char *) ecalloc(strlen(filename) + sizeof(not_reg), 1018 sizeof(char)); 1019 strcpy(m, filename); 1020 strcat(m, not_reg); 1021 } 1022 #endif 1023 } 1024 free(filename); 1025 return (m); 1026 } 1027 1028 /* 1029 * Return the size of a file, as cheaply as possible. 1030 * In Unix, we can stat the file. 1031 */ 1032 public POSITION 1033 filesize(f) 1034 int f; 1035 { 1036 #if HAVE_STAT 1037 struct stat statbuf; 1038 1039 if (fstat(f, &statbuf) >= 0) 1040 return ((POSITION) statbuf.st_size); 1041 #else 1042 #ifdef _OSK 1043 long size; 1044 1045 if ((size = (long) _gs_size(f)) >= 0) 1046 return ((POSITION) size); 1047 #endif 1048 #endif 1049 return (seek_filesize(f)); 1050 } 1051 1052 /* 1053 * 1054 */ 1055 public char * 1056 shell_coption() 1057 { 1058 return ("-c"); 1059 } 1060