1 /* 2 * Copyright (C) 1984-2002 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 IFILE curr_ifile; 55 extern IFILE old_ifile; 56 #if SPACES_IN_FILENAMES 57 extern char openquote; 58 extern char closequote; 59 #endif 60 61 /* 62 * Remove quotes around a filename. 63 */ 64 public char * 65 shell_unquote(str) 66 char *str; 67 { 68 char *name; 69 char *p; 70 71 name = p = (char *) ecalloc(strlen(str)+1, sizeof(char)); 72 if (*str == openquote) 73 { 74 str++; 75 while (*str != '\0') 76 { 77 if (*str == closequote) 78 { 79 if (str[1] != closequote) 80 break; 81 str++; 82 } 83 *p++ = *str++; 84 } 85 } else 86 { 87 char *esc = get_meta_escape(); 88 int esclen = strlen(esc); 89 while (*str != '\0') 90 { 91 if (esclen > 0 && strncmp(str, esc, esclen) == 0) 92 str += esclen; 93 *p++ = *str++; 94 } 95 } 96 *p = '\0'; 97 return (name); 98 } 99 100 /* 101 * Get the shell's escape character. 102 */ 103 public char * 104 get_meta_escape() 105 { 106 char *s; 107 108 s = lgetenv("LESSMETAESCAPE"); 109 if (s == NULL) 110 s = DEF_METAESCAPE; 111 return (s); 112 } 113 114 /* 115 * Get the characters which the shell considers to be "metacharacters". 116 */ 117 static char * 118 metachars() 119 { 120 static char *mchars = NULL; 121 122 if (mchars == NULL) 123 { 124 mchars = lgetenv("LESSMETACHARS"); 125 if (mchars == NULL) 126 mchars = DEF_METACHARS; 127 } 128 return (mchars); 129 } 130 131 /* 132 * Is this a shell metacharacter? 133 */ 134 static int 135 metachar(c) 136 char c; 137 { 138 return (strchr(metachars(), c) != NULL); 139 } 140 141 /* 142 * Insert a backslash before each metacharacter in a string. 143 */ 144 public char * 145 shell_quote(s) 146 char *s; 147 { 148 char *p; 149 char *newstr; 150 int len; 151 char *esc = get_meta_escape(); 152 int esclen = strlen(esc); 153 int use_quotes = 0; 154 int have_quotes = 0; 155 156 /* 157 * Determine how big a string we need to allocate. 158 */ 159 len = 1; /* Trailing null byte */ 160 for (p = s; *p != '\0'; p++) 161 { 162 len++; 163 if (*p == openquote || *p == closequote) 164 have_quotes = 1; 165 if (metachar(*p)) 166 { 167 if (esclen == 0) 168 { 169 /* 170 * We've got a metachar, but this shell 171 * doesn't support escape chars. Use quotes. 172 */ 173 use_quotes = 1; 174 } else 175 { 176 /* 177 * Allow space for the escape char. 178 */ 179 len += esclen; 180 } 181 } 182 } 183 if (use_quotes) 184 { 185 if (have_quotes) 186 /* 187 * We can't quote a string that contains quotes. 188 */ 189 return (NULL); 190 len = strlen(s) + 3; 191 } 192 /* 193 * Allocate and construct the new string. 194 */ 195 newstr = p = (char *) ecalloc(len, sizeof(char)); 196 if (use_quotes) 197 { 198 snprintf(newstr, len, "%c%s%c", openquote, s, closequote); 199 } else 200 { 201 while (*s != '\0') 202 { 203 if (metachar(*s)) 204 { 205 /* 206 * Add the escape char. 207 */ 208 strlcpy(p, esc, newstr + len - p); 209 p += esclen; 210 } 211 *p++ = *s++; 212 } 213 *p = '\0'; 214 } 215 return (newstr); 216 } 217 218 /* 219 * Return a pathname that points to a specified file in a specified directory. 220 * Return NULL if the file does not exist in the directory. 221 */ 222 static char * 223 dirfile(dirname, filename) 224 char *dirname; 225 char *filename; 226 { 227 char *pathname; 228 char *qpathname; 229 int f; 230 size_t len; 231 232 if (dirname == NULL || *dirname == '\0') 233 return (NULL); 234 /* 235 * Construct the full pathname. 236 */ 237 len = strlen(dirname) + strlen(filename) + 2; 238 pathname = (char *) calloc(len, sizeof(char)); 239 if (pathname == NULL) 240 return (NULL); 241 snprintf(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename); 242 /* 243 * Make sure the file exists. 244 */ 245 qpathname = shell_unquote(pathname); 246 f = open(qpathname, OPEN_READ); 247 if (f < 0) 248 { 249 free(pathname); 250 pathname = NULL; 251 } else 252 { 253 close(f); 254 } 255 free(qpathname); 256 return (pathname); 257 } 258 259 /* 260 * Return the full pathname of the given file in the "home directory". 261 */ 262 public char * 263 homefile(filename) 264 char *filename; 265 { 266 register char *pathname; 267 268 /* 269 * Try $HOME/filename. 270 */ 271 pathname = dirfile(lgetenv("HOME"), filename); 272 if (pathname != NULL) 273 return (pathname); 274 #if OS2 275 /* 276 * Try $INIT/filename. 277 */ 278 pathname = dirfile(lgetenv("INIT"), filename); 279 if (pathname != NULL) 280 return (pathname); 281 #endif 282 #if MSDOS_COMPILER || OS2 283 /* 284 * Look for the file anywhere on search path. 285 */ 286 pathname = (char *) calloc(_MAX_PATH, sizeof(char)); 287 #if MSDOS_COMPILER==DJGPPC 288 { 289 char *res = searchpath(filename); 290 if (res == 0) 291 *pathname = '\0'; 292 else 293 strlcpy(pathname, res, _MAX_PATH); 294 } 295 #else 296 _searchenv(filename, "PATH", pathname); 297 #endif 298 if (*pathname != '\0') 299 return (pathname); 300 free(pathname); 301 #endif 302 return (NULL); 303 } 304 305 #ifdef HELPFILE 306 /* 307 * Find out where the help file is. 308 */ 309 public char * 310 find_helpfile() 311 { 312 char *helpfile; 313 314 if ((helpfile = getenv("LESSHELP")) != NULL && *helpfile != '\0') 315 return (save(helpfile)); 316 #if MSDOS_COMPILER || OS2 317 return (homefile(HELPFILE)); 318 #else 319 return (save(HELPFILE)); 320 #endif 321 } 322 #endif 323 324 /* 325 * Expand a string, substituting any "%" with the current filename, 326 * and any "#" with the previous filename. 327 * But a string of N "%"s is just replaced with N-1 "%"s. 328 * Likewise for a string of N "#"s. 329 * {{ This is a lot of work just to support % and #. }} 330 */ 331 public char * 332 fexpand(s) 333 char *s; 334 { 335 register char *fr, *to; 336 register int n; 337 register char *e; 338 IFILE ifile; 339 340 #define fchar_ifile(c) \ 341 ((c) == '%' ? curr_ifile : \ 342 (c) == '#' ? old_ifile : NULL_IFILE) 343 344 /* 345 * Make one pass to see how big a buffer we 346 * need to allocate for the expanded string. 347 */ 348 n = 0; 349 for (fr = s; *fr != '\0'; fr++) 350 { 351 switch (*fr) 352 { 353 case '%': 354 case '#': 355 if (fr > s && fr[-1] == *fr) 356 { 357 /* 358 * Second (or later) char in a string 359 * of identical chars. Treat as normal. 360 */ 361 n++; 362 } else if (fr[1] != *fr) 363 { 364 /* 365 * Single char (not repeated). Treat specially. 366 */ 367 ifile = fchar_ifile(*fr); 368 if (ifile == NULL_IFILE) 369 n++; 370 else 371 n += strlen(get_filename(ifile)); 372 } 373 /* 374 * Else it is the first char in a string of 375 * identical chars. Just discard it. 376 */ 377 break; 378 default: 379 n++; 380 break; 381 } 382 } 383 384 e = (char *) ecalloc(n+1, sizeof(char)); 385 386 /* 387 * Now copy the string, expanding any "%" or "#". 388 */ 389 to = e; 390 for (fr = s; *fr != '\0'; fr++) 391 { 392 switch (*fr) 393 { 394 case '%': 395 case '#': 396 if (fr > s && fr[-1] == *fr) 397 { 398 *to++ = *fr; 399 } else if (fr[1] != *fr) 400 { 401 ifile = fchar_ifile(*fr); 402 if (ifile == NULL_IFILE) 403 *to++ = *fr; 404 else 405 { 406 strlcpy(to, get_filename(ifile), 407 e + n + 1 - to); 408 to += strlen(to); 409 } 410 } 411 break; 412 default: 413 *to++ = *fr; 414 break; 415 } 416 } 417 *to = '\0'; 418 return (e); 419 } 420 421 #if TAB_COMPLETE_FILENAME 422 423 /* 424 * Return a blank-separated list of filenames which "complete" 425 * the given string. 426 */ 427 public char * 428 fcomplete(s) 429 char *s; 430 { 431 char *fpat; 432 char *qs; 433 size_t len; 434 435 if (secure) 436 return (NULL); 437 /* 438 * Complete the filename "s" by globbing "s*". 439 */ 440 #if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC) 441 /* 442 * But in DOS, we have to glob "s*.*". 443 * But if the final component of the filename already has 444 * a dot in it, just do "s*". 445 * (Thus, "FILE" is globbed as "FILE*.*", 446 * but "FILE.A" is globbed as "FILE.A*"). 447 */ 448 { 449 char *slash; 450 for (slash = s+strlen(s)-1; slash > s; slash--) 451 if (*slash == *PATHNAME_SEP || *slash == '/') 452 break; 453 len = strlen(s) + 4; 454 fpat = (char *) ecalloc(len, sizeof(char)); 455 if (strchr(slash, '.') == NULL) 456 snprintf(fpat, len, "%s*.*", s); 457 else 458 snprintf(fpat, len, "%s*", s); 459 } 460 #else 461 len = strlen(s) + 2; 462 fpat = (char *) ecalloc(len, sizeof(char)); 463 snprintf(fpat, len, "%s*", s); 464 #endif 465 qs = lglob(fpat); 466 s = shell_unquote(qs); 467 if (strcmp(s,fpat) == 0) 468 { 469 /* 470 * The filename didn't expand. 471 */ 472 free(qs); 473 qs = NULL; 474 } 475 free(s); 476 free(fpat); 477 return (qs); 478 } 479 #endif 480 481 /* 482 * Try to determine if a file is "binary". 483 * This is just a guess, and we need not try too hard to make it accurate. 484 */ 485 public int 486 bin_file(f) 487 int f; 488 { 489 int i; 490 int n; 491 unsigned char data[64]; 492 493 if (!seekable(f)) 494 return (0); 495 if (lseek(f, (off_t)0, 0) == BAD_LSEEK) 496 return (0); 497 n = read(f, data, sizeof(data)); 498 for (i = 0; i < n; i++) 499 if (binary_char(data[i])) 500 return (1); 501 return (0); 502 } 503 504 /* 505 * Try to determine the size of a file by seeking to the end. 506 */ 507 static POSITION 508 seek_filesize(f) 509 int f; 510 { 511 off_t spos; 512 513 spos = lseek(f, (off_t)0, 2); 514 if (spos == BAD_LSEEK) 515 return (NULL_POSITION); 516 return ((POSITION) spos); 517 } 518 519 /* 520 * Read a string from a file. 521 * Return a pointer to the string in memory. 522 */ 523 static char * 524 readfd(fd) 525 FILE *fd; 526 { 527 int len; 528 int ch; 529 char *buf; 530 char *p; 531 532 /* 533 * Make a guess about how many chars in the string 534 * and allocate a buffer to hold it. 535 */ 536 len = 100; 537 buf = (char *) ecalloc(len, sizeof(char)); 538 for (p = buf; ; p++) 539 { 540 if ((ch = getc(fd)) == '\n' || ch == EOF) 541 break; 542 if (p - buf >= len-1) 543 { 544 /* 545 * The string is too big to fit in the buffer we have. 546 * Allocate a new buffer, twice as big. 547 */ 548 len *= 2; 549 *p = '\0'; 550 p = (char *) ecalloc(len, sizeof(char)); 551 strlcpy(p, buf, len); 552 free(buf); 553 buf = p; 554 p = buf + strlen(buf); 555 } 556 *p = ch; 557 } 558 *p = '\0'; 559 return (buf); 560 } 561 562 563 564 #if HAVE_POPEN 565 566 FILE *popen(); 567 568 /* 569 * Execute a shell command. 570 * Return a pointer to a pipe connected to the shell command's standard output. 571 */ 572 static FILE * 573 shellcmd(cmd) 574 char *cmd; 575 { 576 FILE *fd; 577 size_t len; 578 579 #if HAVE_SHELL 580 char *shell; 581 582 shell = lgetenv("SHELL"); 583 if (shell != NULL && *shell != '\0') 584 { 585 char *scmd; 586 char *esccmd; 587 588 /* 589 * Read the output of <$SHELL -c cmd>. 590 * Escape any metacharacters in the command. 591 */ 592 esccmd = shell_quote(cmd); 593 if (esccmd == NULL) 594 { 595 fd = popen(cmd, "r"); 596 } else 597 { 598 len = strlen(shell) + strlen(esccmd) + 5; 599 scmd = (char *) ecalloc(len, sizeof(char)); 600 snprintf(scmd, len, "%s %s %s", shell, shell_coption(), 601 esccmd); 602 free(esccmd); 603 fd = popen(scmd, "r"); 604 free(scmd); 605 } 606 } else 607 #endif 608 { 609 fd = popen(cmd, "r"); 610 } 611 /* 612 * Redirection in `popen' might have messed with the 613 * standard devices. Restore binary input mode. 614 */ 615 SET_BINARY(0); 616 return (fd); 617 } 618 619 #endif /* HAVE_POPEN */ 620 621 622 /* 623 * Expand a filename, doing any system-specific metacharacter substitutions. 624 */ 625 public char * 626 lglob(filename) 627 char *filename; 628 { 629 char *gfilename; 630 char *ofilename; 631 632 ofilename = fexpand(filename); 633 if (secure) 634 return (ofilename); 635 filename = shell_unquote(ofilename); 636 637 #ifdef DECL_GLOB_LIST 638 { 639 /* 640 * The globbing function returns a list of names. 641 */ 642 int length; 643 char *p; 644 char *qfilename; 645 DECL_GLOB_LIST(list) 646 647 GLOB_LIST(filename, list); 648 if (GLOB_LIST_FAILED(list)) 649 { 650 free(filename); 651 return (ofilename); 652 } 653 length = 1; /* Room for trailing null byte */ 654 for (SCAN_GLOB_LIST(list, p)) 655 { 656 INIT_GLOB_LIST(list, p); 657 qfilename = shell_quote(p); 658 if (qfilename != NULL) 659 { 660 length += strlen(qfilename) + 1; 661 free(qfilename); 662 } 663 } 664 gfilename = (char *) ecalloc(length, sizeof(char)); 665 for (SCAN_GLOB_LIST(list, p)) 666 { 667 INIT_GLOB_LIST(list, p); 668 qfilename = shell_quote(p); 669 if (qfilename != NULL) 670 { 671 snprintf(gfilename + strlen(gfilename), 672 length - strlen(gfilename), "%s ", qfilename); 673 free(qfilename); 674 } 675 } 676 /* 677 * Overwrite the final trailing space with a null terminator. 678 */ 679 *--p = '\0'; 680 GLOB_LIST_DONE(list); 681 } 682 #else 683 #ifdef DECL_GLOB_NAME 684 { 685 /* 686 * The globbing function returns a single name, and 687 * is called multiple times to walk thru all names. 688 */ 689 register char *p; 690 register int len; 691 register int n; 692 char *pathname; 693 char *qpathname; 694 DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle) 695 696 GLOB_FIRST_NAME(filename, &fnd, handle); 697 if (GLOB_FIRST_FAILED(handle)) 698 { 699 free(filename); 700 return (ofilename); 701 } 702 703 _splitpath(filename, drive, dir, fname, ext); 704 len = 100; 705 gfilename = (char *) ecalloc(len, sizeof(char)); 706 p = gfilename; 707 do { 708 n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1; 709 pathname = (char *) ecalloc(n, sizeof(char)); 710 snprintf(pathname, n, "%s%s%s", drive, dir, fnd.GLOB_NAME); 711 qpathname = shell_quote(pathname); 712 free(pathname); 713 if (qpathname != NULL) 714 { 715 n = strlen(qpathname); 716 while (p - gfilename + n + 2 >= len) 717 { 718 /* 719 * No room in current buffer. 720 * Allocate a bigger one. 721 */ 722 len *= 2; 723 *p = '\0'; 724 p = (char *) ecalloc(len, sizeof(char)); 725 strlcpy(p, gfilename, len); 726 free(gfilename); 727 gfilename = p; 728 p = gfilename + strlen(gfilename); 729 } 730 strlcpy(p, qpathname, gfilename + len - p); 731 free(qpathname); 732 p += n; 733 *p++ = ' '; 734 } 735 } while (GLOB_NEXT_NAME(handle, &fnd) == 0); 736 737 /* 738 * Overwrite the final trailing space with a null terminator. 739 */ 740 *--p = '\0'; 741 GLOB_NAME_DONE(handle); 742 } 743 #else 744 #if HAVE_POPEN 745 { 746 /* 747 * We get the shell to glob the filename for us by passing 748 * an "echo" command to the shell and reading its output. 749 */ 750 FILE *fd; 751 char *s; 752 char *lessecho; 753 char *cmd; 754 char *esc; 755 size_t len; 756 757 esc = get_meta_escape(); 758 if (strlen(esc) == 0) 759 esc = "-"; 760 esc = shell_quote(esc); 761 if (esc == NULL) 762 { 763 free(filename); 764 return (ofilename); 765 } 766 lessecho = lgetenv("LESSECHO"); 767 if (lessecho == NULL || *lessecho == '\0') 768 lessecho = "lessecho"; 769 /* 770 * Invoke lessecho, and read its output (a globbed list of filenames). 771 */ 772 len = strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24; 773 cmd = (char *) ecalloc(len, sizeof(char)); 774 snprintf(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, 775 closequote, esc); 776 free(esc); 777 for (s = metachars(); *s != '\0'; s++) 778 snprintf(cmd + strlen(cmd), len - strlen(cmd), "-n0x%x ", *s); 779 snprintf(cmd + strlen(cmd), len - strlen(cmd), "-- %s", ofilename); 780 fd = shellcmd(cmd); 781 free(cmd); 782 if (fd == NULL) 783 { 784 /* 785 * Cannot create the pipe. 786 * Just return the original (fexpanded) filename. 787 */ 788 free(filename); 789 return (ofilename); 790 } 791 gfilename = readfd(fd); 792 pclose(fd); 793 if (*gfilename == '\0') 794 { 795 free(gfilename); 796 free(filename); 797 return (ofilename); 798 } 799 } 800 #else 801 /* 802 * No globbing functions at all. Just use the fexpanded filename. 803 */ 804 gfilename = save(filename); 805 #endif 806 #endif 807 #endif 808 free(filename); 809 free(ofilename); 810 return (gfilename); 811 } 812 813 /* 814 * See if we should open a "replacement file" 815 * instead of the file we're about to open. 816 */ 817 public char * 818 open_altfile(filename, pf, pfd) 819 char *filename; 820 int *pf; 821 void **pfd; 822 { 823 #if !HAVE_POPEN 824 return (NULL); 825 #else 826 char *lessopen; 827 char *cmd; 828 FILE *fd; 829 size_t len; 830 #if HAVE_FILENO 831 int returnfd = 0; 832 #endif 833 834 if (!use_lessopen || secure) 835 return (NULL); 836 ch_ungetchar(-1); 837 if ((lessopen = lgetenv("LESSOPEN")) == NULL) 838 return (NULL); 839 if (strcmp(filename, "-") == 0) 840 return (NULL); 841 if (*lessopen == '|') 842 { 843 /* 844 * If LESSOPEN starts with a |, it indicates 845 * a "pipe preprocessor". 846 */ 847 #if HAVE_FILENO 848 lessopen++; 849 returnfd = 1; 850 #else 851 error("LESSOPEN pipe is not supported", NULL_PARG); 852 return (NULL); 853 #endif 854 } 855 856 len = strlen(lessopen) + strlen(filename) + 2; 857 cmd = (char *) ecalloc(len, sizeof(char)); 858 snprintf(cmd, len, lessopen, filename); 859 fd = shellcmd(cmd); 860 free(cmd); 861 if (fd == NULL) 862 { 863 /* 864 * Cannot create the pipe. 865 */ 866 return (NULL); 867 } 868 #if HAVE_FILENO 869 if (returnfd) 870 { 871 int f; 872 char c; 873 874 /* 875 * Read one char to see if the pipe will produce any data. 876 * If it does, push the char back on the pipe. 877 */ 878 f = fileno(fd); 879 SET_BINARY(f); 880 if (read(f, &c, 1) != 1) 881 { 882 /* 883 * Pipe is empty. This means there is no alt file. 884 */ 885 pclose(fd); 886 return (NULL); 887 } 888 ch_ungetchar(c); 889 *pfd = (void *) fd; 890 *pf = f; 891 return (save("-")); 892 } 893 #endif 894 cmd = readfd(fd); 895 pclose(fd); 896 if (*cmd == '\0') 897 /* 898 * Pipe is empty. This means there is no alt file. 899 */ 900 return (NULL); 901 return (cmd); 902 #endif /* HAVE_POPEN */ 903 } 904 905 /* 906 * Close a replacement file. 907 */ 908 public void 909 close_altfile(altfilename, filename, pipefd) 910 char *altfilename; 911 char *filename; 912 void *pipefd; 913 { 914 #if HAVE_POPEN 915 char *lessclose; 916 FILE *fd; 917 char *cmd; 918 size_t len; 919 920 if (secure) 921 return; 922 if (pipefd != NULL) 923 { 924 #if OS2 925 /* 926 * The pclose function of OS/2 emx sometimes fails. 927 * Send SIGINT to the piped process before closing it. 928 */ 929 kill(((FILE*)pipefd)->_pid, SIGINT); 930 #endif 931 pclose((FILE*) pipefd); 932 } 933 if ((lessclose = lgetenv("LESSCLOSE")) == NULL) 934 return; 935 len = strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2; 936 cmd = (char *) ecalloc(len, sizeof(char)); 937 snprintf(cmd, len, lessclose, filename, altfilename); 938 fd = shellcmd(cmd); 939 free(cmd); 940 if (fd != NULL) 941 pclose(fd); 942 #endif 943 } 944 945 /* 946 * Is the specified file a directory? 947 */ 948 public int 949 is_dir(filename) 950 char *filename; 951 { 952 int isdir = 0; 953 954 filename = shell_unquote(filename); 955 #if HAVE_STAT 956 { 957 int r; 958 struct stat statbuf; 959 960 r = stat(filename, &statbuf); 961 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode)); 962 } 963 #else 964 #ifdef _OSK 965 { 966 register int f; 967 968 f = open(filename, S_IREAD | S_IFDIR); 969 if (f >= 0) 970 close(f); 971 isdir = (f >= 0); 972 } 973 #endif 974 #endif 975 free(filename); 976 return (isdir); 977 } 978 979 /* 980 * Returns NULL if the file can be opened and 981 * is an ordinary file, otherwise an error message 982 * (if it cannot be opened or is a directory, etc.) 983 */ 984 public char * 985 bad_file(filename) 986 char *filename; 987 { 988 register char *m = NULL; 989 size_t len; 990 991 filename = shell_unquote(filename); 992 if (is_dir(filename)) 993 { 994 static char is_a_dir[] = " is a directory"; 995 996 len = strlen(filename) + sizeof(is_a_dir); 997 m = (char *) ecalloc(len, sizeof(char)); 998 strlcpy(m, filename, len); 999 strlcat(m, is_a_dir, len); 1000 } else 1001 { 1002 #if HAVE_STAT 1003 int r; 1004 struct stat statbuf; 1005 1006 r = stat(filename, &statbuf); 1007 if (r < 0) 1008 { 1009 m = errno_message(filename); 1010 } else if (force_open) 1011 { 1012 m = NULL; 1013 } else if (!S_ISREG(statbuf.st_mode)) 1014 { 1015 static char not_reg[] = " is not a regular file (use -f to see it)"; 1016 len = strlen(filename) + sizeof(not_reg); 1017 m = (char *) ecalloc(len, sizeof(char)); 1018 strlcpy(m, filename, len); 1019 strlcat(m, not_reg, len); 1020 } 1021 #endif 1022 } 1023 free(filename); 1024 return (m); 1025 } 1026 1027 /* 1028 * Return the size of a file, as cheaply as possible. 1029 * In Unix, we can stat the file. 1030 */ 1031 public POSITION 1032 filesize(f) 1033 int f; 1034 { 1035 #if HAVE_STAT 1036 struct stat statbuf; 1037 1038 if (fstat(f, &statbuf) >= 0) 1039 return ((POSITION) statbuf.st_size); 1040 #else 1041 #ifdef _OSK 1042 long size; 1043 1044 if ((size = (long) _gs_size(f)) >= 0) 1045 return ((POSITION) size); 1046 #endif 1047 #endif 1048 return (seek_filesize(f)); 1049 } 1050 1051 /* 1052 * 1053 */ 1054 public char * 1055 shell_coption() 1056 { 1057 return ("-c"); 1058 } 1059