1 /* 2 * Copyright (C) 1984-2012 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, see the README file. 8 */ 9 10 11 /* 12 * Routines to mess around with filenames (and files). 13 * Much of this is very OS dependent. 14 */ 15 16 #include "less.h" 17 #include "lglob.h" 18 #if MSDOS_COMPILER 19 #include <dos.h> 20 #if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER) 21 #include <dir.h> 22 #endif 23 #if MSDOS_COMPILER==DJGPPC 24 #include <glob.h> 25 #include <dir.h> 26 #define _MAX_PATH PATH_MAX 27 #endif 28 #endif 29 #ifdef _OSK 30 #include <rbf.h> 31 #ifndef _OSK_MWC32 32 #include <modes.h> 33 #endif 34 #endif 35 #if OS2 36 #include <signal.h> 37 #endif 38 39 #if HAVE_STAT 40 #include <sys/stat.h> 41 #ifndef S_ISDIR 42 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) 43 #endif 44 #ifndef S_ISREG 45 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) 46 #endif 47 #endif 48 49 50 extern int force_open; 51 extern int secure; 52 extern int use_lessopen; 53 extern int ctldisp; 54 extern int utf_mode; 55 extern IFILE curr_ifile; 56 extern IFILE old_ifile; 57 #if SPACES_IN_FILENAMES 58 extern char openquote; 59 extern char closequote; 60 #endif 61 62 /* 63 * Remove quotes around a filename. 64 */ 65 public char * 66 shell_unquote(str) 67 char *str; 68 { 69 char *name; 70 char *p; 71 72 name = p = (char *) ecalloc(strlen(str)+1, sizeof(char)); 73 if (*str == openquote) 74 { 75 str++; 76 while (*str != '\0') 77 { 78 if (*str == closequote) 79 { 80 if (str[1] != closequote) 81 break; 82 str++; 83 } 84 *p++ = *str++; 85 } 86 } else 87 { 88 char *esc = get_meta_escape(); 89 int esclen = strlen(esc); 90 while (*str != '\0') 91 { 92 if (esclen > 0 && strncmp(str, esc, esclen) == 0) 93 str += esclen; 94 *p++ = *str++; 95 } 96 } 97 *p = '\0'; 98 return (name); 99 } 100 101 /* 102 * Get the shell's escape character. 103 */ 104 public char * 105 get_meta_escape() 106 { 107 char *s; 108 109 s = lgetenv("LESSMETAESCAPE"); 110 if (s == NULL) 111 s = DEF_METAESCAPE; 112 return (s); 113 } 114 115 /* 116 * Get the characters which the shell considers to be "metacharacters". 117 */ 118 static char * 119 metachars() 120 { 121 static char *mchars = NULL; 122 123 if (mchars == NULL) 124 { 125 mchars = lgetenv("LESSMETACHARS"); 126 if (mchars == NULL) 127 mchars = DEF_METACHARS; 128 } 129 return (mchars); 130 } 131 132 /* 133 * Is this a shell metacharacter? 134 */ 135 static int 136 metachar(c) 137 char c; 138 { 139 return (strchr(metachars(), c) != NULL); 140 } 141 142 /* 143 * Insert a backslash before each metacharacter in a string. 144 */ 145 public char * 146 shell_quote(s) 147 char *s; 148 { 149 char *p; 150 char *newstr; 151 int len; 152 char *esc = get_meta_escape(); 153 int esclen = strlen(esc); 154 int use_quotes = 0; 155 int have_quotes = 0; 156 157 /* 158 * Determine how big a string we need to allocate. 159 */ 160 len = 1; /* Trailing null byte */ 161 for (p = s; *p != '\0'; p++) 162 { 163 len++; 164 if (*p == openquote || *p == closequote) 165 have_quotes = 1; 166 if (metachar(*p)) 167 { 168 if (esclen == 0) 169 { 170 /* 171 * We've got a metachar, but this shell 172 * doesn't support escape chars. Use quotes. 173 */ 174 use_quotes = 1; 175 } else 176 { 177 /* 178 * Allow space for the escape char. 179 */ 180 len += esclen; 181 } 182 } 183 } 184 if (use_quotes) 185 { 186 if (have_quotes) 187 /* 188 * We can't quote a string that contains quotes. 189 */ 190 return (NULL); 191 len = strlen(s) + 3; 192 } 193 /* 194 * Allocate and construct the new string. 195 */ 196 newstr = p = (char *) ecalloc(len, sizeof(char)); 197 if (use_quotes) 198 { 199 SNPRINTF3(newstr, len, "%c%s%c", openquote, s, closequote); 200 } else 201 { 202 while (*s != '\0') 203 { 204 if (metachar(*s)) 205 { 206 /* 207 * Add the escape char. 208 */ 209 strcpy(p, esc); 210 p += esclen; 211 } 212 *p++ = *s++; 213 } 214 *p = '\0'; 215 } 216 return (newstr); 217 } 218 219 /* 220 * Return a pathname that points to a specified file in a specified directory. 221 * Return NULL if the file does not exist in the directory. 222 */ 223 static char * 224 dirfile(dirname, filename) 225 char *dirname; 226 char *filename; 227 { 228 char *pathname; 229 char *qpathname; 230 int len; 231 int f; 232 233 if (dirname == NULL || *dirname == '\0') 234 return (NULL); 235 /* 236 * Construct the full pathname. 237 */ 238 len= strlen(dirname) + strlen(filename) + 2; 239 pathname = (char *) calloc(len, sizeof(char)); 240 if (pathname == NULL) 241 return (NULL); 242 SNPRINTF3(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename); 243 /* 244 * Make sure the file exists. 245 */ 246 qpathname = shell_unquote(pathname); 247 f = open(qpathname, OPEN_READ); 248 if (f < 0) 249 { 250 free(pathname); 251 pathname = NULL; 252 } else 253 { 254 close(f); 255 } 256 free(qpathname); 257 return (pathname); 258 } 259 260 /* 261 * Return the full pathname of the given file in the "home directory". 262 */ 263 public char * 264 homefile(filename) 265 char *filename; 266 { 267 register char *pathname; 268 269 /* 270 * Try $HOME/filename. 271 */ 272 pathname = dirfile(lgetenv("HOME"), filename); 273 if (pathname != NULL) 274 return (pathname); 275 #if OS2 276 /* 277 * Try $INIT/filename. 278 */ 279 pathname = dirfile(lgetenv("INIT"), filename); 280 if (pathname != NULL) 281 return (pathname); 282 #endif 283 #if MSDOS_COMPILER || OS2 284 /* 285 * Look for the file anywhere on search path. 286 */ 287 pathname = (char *) calloc(_MAX_PATH, sizeof(char)); 288 #if MSDOS_COMPILER==DJGPPC 289 { 290 char *res = searchpath(filename); 291 if (res == 0) 292 *pathname = '\0'; 293 else 294 strcpy(pathname, res); 295 } 296 #else 297 _searchenv(filename, "PATH", pathname); 298 #endif 299 if (*pathname != '\0') 300 return (pathname); 301 free(pathname); 302 #endif 303 return (NULL); 304 } 305 306 /* 307 * Expand a string, substituting any "%" with the current filename, 308 * and any "#" with the previous filename. 309 * But a string of N "%"s is just replaced with N-1 "%"s. 310 * Likewise for a string of N "#"s. 311 * {{ This is a lot of work just to support % and #. }} 312 */ 313 public char * 314 fexpand(s) 315 char *s; 316 { 317 register char *fr, *to; 318 register int n; 319 register char *e; 320 IFILE ifile; 321 322 #define fchar_ifile(c) \ 323 ((c) == '%' ? curr_ifile : \ 324 (c) == '#' ? old_ifile : NULL_IFILE) 325 326 /* 327 * Make one pass to see how big a buffer we 328 * need to allocate for the expanded string. 329 */ 330 n = 0; 331 for (fr = s; *fr != '\0'; fr++) 332 { 333 switch (*fr) 334 { 335 case '%': 336 case '#': 337 if (fr > s && fr[-1] == *fr) 338 { 339 /* 340 * Second (or later) char in a string 341 * of identical chars. Treat as normal. 342 */ 343 n++; 344 } else if (fr[1] != *fr) 345 { 346 /* 347 * Single char (not repeated). Treat specially. 348 */ 349 ifile = fchar_ifile(*fr); 350 if (ifile == NULL_IFILE) 351 n++; 352 else 353 n += strlen(get_filename(ifile)); 354 } 355 /* 356 * Else it is the first char in a string of 357 * identical chars. Just discard it. 358 */ 359 break; 360 default: 361 n++; 362 break; 363 } 364 } 365 366 e = (char *) ecalloc(n+1, sizeof(char)); 367 368 /* 369 * Now copy the string, expanding any "%" or "#". 370 */ 371 to = e; 372 for (fr = s; *fr != '\0'; fr++) 373 { 374 switch (*fr) 375 { 376 case '%': 377 case '#': 378 if (fr > s && fr[-1] == *fr) 379 { 380 *to++ = *fr; 381 } else if (fr[1] != *fr) 382 { 383 ifile = fchar_ifile(*fr); 384 if (ifile == NULL_IFILE) 385 *to++ = *fr; 386 else 387 { 388 strcpy(to, get_filename(ifile)); 389 to += strlen(to); 390 } 391 } 392 break; 393 default: 394 *to++ = *fr; 395 break; 396 } 397 } 398 *to = '\0'; 399 return (e); 400 } 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 * Return number of %s escapes in a string. 810 * Return a large number if there are any other % escapes besides %s. 811 */ 812 static int 813 num_pct_s(lessopen) 814 char *lessopen; 815 { 816 int num; 817 818 for (num = 0;; num++) 819 { 820 lessopen = strchr(lessopen, '%'); 821 if (lessopen == NULL) 822 break; 823 if (*++lessopen != 's') 824 return (999); 825 } 826 return (num); 827 } 828 829 /* 830 * See if we should open a "replacement file" 831 * instead of the file we're about to open. 832 */ 833 public char * 834 open_altfile(filename, pf, pfd) 835 char *filename; 836 int *pf; 837 void **pfd; 838 { 839 #if !HAVE_POPEN 840 return (NULL); 841 #else 842 char *lessopen; 843 char *cmd; 844 int len; 845 FILE *fd; 846 #if HAVE_FILENO 847 int returnfd = 0; 848 #endif 849 850 if (!use_lessopen || secure) 851 return (NULL); 852 ch_ungetchar(-1); 853 if ((lessopen = lgetenv("LESSOPEN")) == NULL) 854 return (NULL); 855 while (*lessopen == '|') 856 { 857 /* 858 * If LESSOPEN starts with a |, it indicates 859 * a "pipe preprocessor". 860 */ 861 #if !HAVE_FILENO 862 error("LESSOPEN pipe is not supported", NULL_PARG); 863 return (NULL); 864 #else 865 lessopen++; 866 returnfd++; 867 #endif 868 } 869 if (*lessopen == '-') { 870 /* 871 * Lessopen preprocessor will accept "-" as a filename. 872 */ 873 lessopen++; 874 } else { 875 if (strcmp(filename, "-") == 0) 876 return (NULL); 877 } 878 if (num_pct_s(lessopen) > 1) 879 { 880 error("Invalid LESSOPEN variable", NULL_PARG); 881 return (NULL); 882 } 883 884 len = strlen(lessopen) + strlen(filename) + 2; 885 cmd = (char *) ecalloc(len, sizeof(char)); 886 SNPRINTF1(cmd, len, lessopen, filename); 887 fd = shellcmd(cmd); 888 free(cmd); 889 if (fd == NULL) 890 { 891 /* 892 * Cannot create the pipe. 893 */ 894 return (NULL); 895 } 896 #if HAVE_FILENO 897 if (returnfd) 898 { 899 int f; 900 char c; 901 902 /* 903 * Read one char to see if the pipe will produce any data. 904 * If it does, push the char back on the pipe. 905 */ 906 f = fileno(fd); 907 SET_BINARY(f); 908 if (read(f, &c, 1) != 1) 909 { 910 /* 911 * Pipe is empty. 912 * If more than 1 pipe char was specified, 913 * the exit status tells whether the file itself 914 * is empty, or if there is no alt file. 915 * If only one pipe char, just assume no alt file. 916 */ 917 int status = pclose(fd); 918 if (returnfd > 1 && status == 0) { 919 *pfd = NULL; 920 *pf = -1; 921 return (save(FAKE_EMPTYFILE)); 922 } 923 return (NULL); 924 } 925 ch_ungetchar(c); 926 *pfd = (void *) fd; 927 *pf = f; 928 return (save("-")); 929 } 930 #endif 931 cmd = readfd(fd); 932 pclose(fd); 933 if (*cmd == '\0') 934 /* 935 * Pipe is empty. This means there is no alt file. 936 */ 937 return (NULL); 938 return (cmd); 939 #endif /* HAVE_POPEN */ 940 } 941 942 /* 943 * Close a replacement file. 944 */ 945 public void 946 close_altfile(altfilename, filename, pipefd) 947 char *altfilename; 948 char *filename; 949 void *pipefd; 950 { 951 #if HAVE_POPEN 952 char *lessclose; 953 FILE *fd; 954 char *cmd; 955 int len; 956 957 if (secure) 958 return; 959 if (pipefd != NULL) 960 { 961 #if OS2 962 /* 963 * The pclose function of OS/2 emx sometimes fails. 964 * Send SIGINT to the piped process before closing it. 965 */ 966 kill(((FILE*)pipefd)->_pid, SIGINT); 967 #endif 968 pclose((FILE*) pipefd); 969 } 970 if ((lessclose = lgetenv("LESSCLOSE")) == NULL) 971 return; 972 if (num_pct_s(lessclose) > 2) 973 { 974 error("Invalid LESSCLOSE variable"); 975 return; 976 } 977 len = strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2; 978 cmd = (char *) ecalloc(len, sizeof(char)); 979 SNPRINTF2(cmd, len, lessclose, filename, altfilename); 980 fd = shellcmd(cmd); 981 free(cmd); 982 if (fd != NULL) 983 pclose(fd); 984 #endif 985 } 986 987 /* 988 * Is the specified file a directory? 989 */ 990 public int 991 is_dir(filename) 992 char *filename; 993 { 994 int isdir = 0; 995 996 filename = shell_unquote(filename); 997 #if HAVE_STAT 998 { 999 int r; 1000 struct stat statbuf; 1001 1002 r = stat(filename, &statbuf); 1003 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode)); 1004 } 1005 #else 1006 #ifdef _OSK 1007 { 1008 register int f; 1009 1010 f = open(filename, S_IREAD | S_IFDIR); 1011 if (f >= 0) 1012 close(f); 1013 isdir = (f >= 0); 1014 } 1015 #endif 1016 #endif 1017 free(filename); 1018 return (isdir); 1019 } 1020 1021 /* 1022 * Returns NULL if the file can be opened and 1023 * is an ordinary file, otherwise an error message 1024 * (if it cannot be opened or is a directory, etc.) 1025 */ 1026 public char * 1027 bad_file(filename) 1028 char *filename; 1029 { 1030 register char *m = NULL; 1031 1032 filename = shell_unquote(filename); 1033 if (!force_open && is_dir(filename)) 1034 { 1035 static char is_a_dir[] = " is a directory"; 1036 1037 m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir), 1038 sizeof(char)); 1039 strcpy(m, filename); 1040 strcat(m, is_a_dir); 1041 } else 1042 { 1043 #if HAVE_STAT 1044 int r; 1045 struct stat statbuf; 1046 1047 r = stat(filename, &statbuf); 1048 if (r < 0) 1049 { 1050 m = errno_message(filename); 1051 } else if (force_open) 1052 { 1053 m = NULL; 1054 } else if (!S_ISREG(statbuf.st_mode)) 1055 { 1056 static char not_reg[] = " is not a regular file (use -f to see it)"; 1057 m = (char *) ecalloc(strlen(filename) + sizeof(not_reg), 1058 sizeof(char)); 1059 strcpy(m, filename); 1060 strcat(m, not_reg); 1061 } 1062 #endif 1063 } 1064 free(filename); 1065 return (m); 1066 } 1067 1068 /* 1069 * Return the size of a file, as cheaply as possible. 1070 * In Unix, we can stat the file. 1071 */ 1072 public POSITION 1073 filesize(f) 1074 int f; 1075 { 1076 #if HAVE_STAT 1077 struct stat statbuf; 1078 1079 if (fstat(f, &statbuf) >= 0) 1080 return ((POSITION) statbuf.st_size); 1081 #else 1082 #ifdef _OSK 1083 long size; 1084 1085 if ((size = (long) _gs_size(f)) >= 0) 1086 return ((POSITION) size); 1087 #endif 1088 #endif 1089 return (seek_filesize(f)); 1090 } 1091 1092 /* 1093 * 1094 */ 1095 public char * 1096 shell_coption() 1097 { 1098 return ("-c"); 1099 } 1100 1101 /* 1102 * Return last component of a pathname. 1103 */ 1104 public char * 1105 last_component(name) 1106 char *name; 1107 { 1108 char *slash; 1109 1110 for (slash = name + strlen(name); slash > name; ) 1111 { 1112 --slash; 1113 if (*slash == *PATHNAME_SEP || *slash == '/') 1114 return (slash + 1); 1115 } 1116 return (name); 1117 } 1118 1119