filename.c revision 294286
1/* 2 * Copyright (C) 1984-2015 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 50extern int force_open; 51extern int secure; 52extern int use_lessopen; 53extern int ctldisp; 54extern int utf_mode; 55extern IFILE curr_ifile; 56extern IFILE old_ifile; 57#if SPACES_IN_FILENAMES 58extern char openquote; 59extern char closequote; 60#endif 61 62/* 63 * Remove quotes around a filename. 64 */ 65 public char * 66shell_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 = (int) 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 * 105get_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 * 119metachars() 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 136metachar(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 * 146shell_quote(s) 147 char *s; 148{ 149 char *p; 150 char *newstr; 151 int len; 152 char *esc = get_meta_escape(); 153 int esclen = (int) 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 = (int) 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 * 224dirfile(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 = (int) (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 * 264homefile(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 * 314fexpand(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 += (int) 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 * 410fcomplete(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 = (int) 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 = (int) 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 470bin_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 if (n <= 0) 485 return (0); 486 if (utf_mode) 487 { 488 bin_count = utf_bin_count(data, n); 489 } else 490 { 491 pend = &data[n]; 492 for (p = data; p < pend; ) 493 { 494 LWCHAR c = step_char(&p, +1, pend); 495 if (ctldisp == OPT_ONPLUS && IS_CSI_START(c)) 496 { 497 do { 498 c = step_char(&p, +1, pend); 499 } while (p < pend && is_ansi_middle(c)); 500 } else if (binary_char(c)) 501 bin_count++; 502 } 503 } 504 /* 505 * Call it a binary file if there are more than 5 binary characters 506 * in the first 256 bytes of the file. 507 */ 508 return (bin_count > 5); 509} 510 511/* 512 * Try to determine the size of a file by seeking to the end. 513 */ 514 static POSITION 515seek_filesize(f) 516 int f; 517{ 518 off_t spos; 519 520 spos = lseek(f, (off_t)0, SEEK_END); 521 if (spos == BAD_LSEEK) 522 return (NULL_POSITION); 523 return ((POSITION) spos); 524} 525 526/* 527 * Read a string from a file. 528 * Return a pointer to the string in memory. 529 */ 530 static char * 531readfd(fd) 532 FILE *fd; 533{ 534 int len; 535 int ch; 536 char *buf; 537 char *p; 538 539 /* 540 * Make a guess about how many chars in the string 541 * and allocate a buffer to hold it. 542 */ 543 len = 100; 544 buf = (char *) ecalloc(len, sizeof(char)); 545 for (p = buf; ; p++) 546 { 547 if ((ch = getc(fd)) == '\n' || ch == EOF) 548 break; 549 if (p - buf >= len-1) 550 { 551 /* 552 * The string is too big to fit in the buffer we have. 553 * Allocate a new buffer, twice as big. 554 */ 555 len *= 2; 556 *p = '\0'; 557 p = (char *) ecalloc(len, sizeof(char)); 558 strcpy(p, buf); 559 free(buf); 560 buf = p; 561 p = buf + strlen(buf); 562 } 563 *p = ch; 564 } 565 *p = '\0'; 566 return (buf); 567} 568 569 570 571#if HAVE_POPEN 572 573FILE *popen(); 574 575/* 576 * Execute a shell command. 577 * Return a pointer to a pipe connected to the shell command's standard output. 578 */ 579 static FILE * 580shellcmd(cmd) 581 char *cmd; 582{ 583 FILE *fd; 584 585#if HAVE_SHELL 586 char *shell; 587 588 shell = lgetenv("SHELL"); 589 if (shell != NULL && *shell != '\0') 590 { 591 char *scmd; 592 char *esccmd; 593 594 /* 595 * Read the output of <$SHELL -c cmd>. 596 * Escape any metacharacters in the command. 597 */ 598 esccmd = shell_quote(cmd); 599 if (esccmd == NULL) 600 { 601 fd = popen(cmd, "r"); 602 } else 603 { 604 int len = (int) (strlen(shell) + strlen(esccmd) + 5); 605 scmd = (char *) ecalloc(len, sizeof(char)); 606 SNPRINTF3(scmd, len, "%s %s %s", shell, shell_coption(), esccmd); 607 free(esccmd); 608 fd = popen(scmd, "r"); 609 free(scmd); 610 } 611 } else 612#endif 613 { 614 fd = popen(cmd, "r"); 615 } 616 /* 617 * Redirection in `popen' might have messed with the 618 * standard devices. Restore binary input mode. 619 */ 620 SET_BINARY(0); 621 return (fd); 622} 623 624#endif /* HAVE_POPEN */ 625 626 627/* 628 * Expand a filename, doing any system-specific metacharacter substitutions. 629 */ 630 public char * 631lglob(filename) 632 char *filename; 633{ 634 char *gfilename; 635 char *ofilename; 636 637 ofilename = fexpand(filename); 638 if (secure) 639 return (ofilename); 640 filename = shell_unquote(ofilename); 641 642#ifdef DECL_GLOB_LIST 643{ 644 /* 645 * The globbing function returns a list of names. 646 */ 647 int length; 648 char *p; 649 char *qfilename; 650 DECL_GLOB_LIST(list) 651 652 GLOB_LIST(filename, list); 653 if (GLOB_LIST_FAILED(list)) 654 { 655 free(filename); 656 return (ofilename); 657 } 658 length = 1; /* Room for trailing null byte */ 659 for (SCAN_GLOB_LIST(list, p)) 660 { 661 INIT_GLOB_LIST(list, p); 662 qfilename = shell_quote(p); 663 if (qfilename != NULL) 664 { 665 length += strlen(qfilename) + 1; 666 free(qfilename); 667 } 668 } 669 gfilename = (char *) ecalloc(length, sizeof(char)); 670 for (SCAN_GLOB_LIST(list, p)) 671 { 672 INIT_GLOB_LIST(list, p); 673 qfilename = shell_quote(p); 674 if (qfilename != NULL) 675 { 676 sprintf(gfilename + strlen(gfilename), "%s ", qfilename); 677 free(qfilename); 678 } 679 } 680 /* 681 * Overwrite the final trailing space with a null terminator. 682 */ 683 *--p = '\0'; 684 GLOB_LIST_DONE(list); 685} 686#else 687#ifdef DECL_GLOB_NAME 688{ 689 /* 690 * The globbing function returns a single name, and 691 * is called multiple times to walk thru all names. 692 */ 693 register char *p; 694 register int len; 695 register int n; 696 char *pathname; 697 char *qpathname; 698 DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle) 699 700 GLOB_FIRST_NAME(filename, &fnd, handle); 701 if (GLOB_FIRST_FAILED(handle)) 702 { 703 free(filename); 704 return (ofilename); 705 } 706 707 _splitpath(filename, drive, dir, fname, ext); 708 len = 100; 709 gfilename = (char *) ecalloc(len, sizeof(char)); 710 p = gfilename; 711 do { 712 n = (int) (strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1); 713 pathname = (char *) ecalloc(n, sizeof(char)); 714 SNPRINTF3(pathname, n, "%s%s%s", drive, dir, fnd.GLOB_NAME); 715 qpathname = shell_quote(pathname); 716 free(pathname); 717 if (qpathname != NULL) 718 { 719 n = (int) strlen(qpathname); 720 while (p - gfilename + n + 2 >= len) 721 { 722 /* 723 * No room in current buffer. 724 * Allocate a bigger one. 725 */ 726 len *= 2; 727 *p = '\0'; 728 p = (char *) ecalloc(len, sizeof(char)); 729 strcpy(p, gfilename); 730 free(gfilename); 731 gfilename = p; 732 p = gfilename + strlen(gfilename); 733 } 734 strcpy(p, qpathname); 735 free(qpathname); 736 p += n; 737 *p++ = ' '; 738 } 739 } while (GLOB_NEXT_NAME(handle, &fnd) == 0); 740 741 /* 742 * Overwrite the final trailing space with a null terminator. 743 */ 744 *--p = '\0'; 745 GLOB_NAME_DONE(handle); 746} 747#else 748#if HAVE_POPEN 749{ 750 /* 751 * We get the shell to glob the filename for us by passing 752 * an "echo" command to the shell and reading its output. 753 */ 754 FILE *fd; 755 char *s; 756 char *lessecho; 757 char *cmd; 758 char *esc; 759 int len; 760 761 esc = get_meta_escape(); 762 if (strlen(esc) == 0) 763 esc = "-"; 764 esc = shell_quote(esc); 765 if (esc == NULL) 766 { 767 free(filename); 768 return (ofilename); 769 } 770 lessecho = lgetenv("LESSECHO"); 771 if (lessecho == NULL || *lessecho == '\0') 772 lessecho = "lessecho"; 773 /* 774 * Invoke lessecho, and read its output (a globbed list of filenames). 775 */ 776 len = (int) (strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24); 777 cmd = (char *) ecalloc(len, sizeof(char)); 778 SNPRINTF4(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, closequote, esc); 779 free(esc); 780 for (s = metachars(); *s != '\0'; s++) 781 sprintf(cmd + strlen(cmd), "-n0x%x ", *s); 782 sprintf(cmd + strlen(cmd), "-- %s", ofilename); 783 fd = shellcmd(cmd); 784 free(cmd); 785 if (fd == NULL) 786 { 787 /* 788 * Cannot create the pipe. 789 * Just return the original (fexpanded) filename. 790 */ 791 free(filename); 792 return (ofilename); 793 } 794 gfilename = readfd(fd); 795 pclose(fd); 796 if (*gfilename == '\0') 797 { 798 free(gfilename); 799 free(filename); 800 return (ofilename); 801 } 802} 803#else 804 /* 805 * No globbing functions at all. Just use the fexpanded filename. 806 */ 807 gfilename = save(filename); 808#endif 809#endif 810#endif 811 free(filename); 812 free(ofilename); 813 return (gfilename); 814} 815 816/* 817 * Return number of %s escapes in a string. 818 * Return a large number if there are any other % escapes besides %s. 819 */ 820 static int 821num_pct_s(lessopen) 822 char *lessopen; 823{ 824 int num = 0; 825 826 while (*lessopen != '\0') 827 { 828 if (*lessopen == '%') 829 { 830 if (lessopen[1] == '%') 831 ++lessopen; 832 else if (lessopen[1] == 's') 833 ++num; 834 else 835 return (999); 836 } 837 ++lessopen; 838 } 839 return (num); 840} 841 842/* 843 * See if we should open a "replacement file" 844 * instead of the file we're about to open. 845 */ 846 public char * 847open_altfile(filename, pf, pfd) 848 char *filename; 849 int *pf; 850 void **pfd; 851{ 852#if !HAVE_POPEN 853 return (NULL); 854#else 855 char *lessopen; 856 char *cmd; 857 int len; 858 FILE *fd; 859#if HAVE_FILENO 860 int returnfd = 0; 861#endif 862 863 if (!use_lessopen || secure) 864 return (NULL); 865 ch_ungetchar(-1); 866 if ((lessopen = lgetenv("LESSOPEN")) == NULL) 867 return (NULL); 868 while (*lessopen == '|') 869 { 870 /* 871 * If LESSOPEN starts with a |, it indicates 872 * a "pipe preprocessor". 873 */ 874#if !HAVE_FILENO 875 error("LESSOPEN pipe is not supported", NULL_PARG); 876 return (NULL); 877#else 878 lessopen++; 879 returnfd++; 880#endif 881 } 882 if (*lessopen == '-') { 883 /* 884 * Lessopen preprocessor will accept "-" as a filename. 885 */ 886 lessopen++; 887 } else { 888 if (strcmp(filename, "-") == 0) 889 return (NULL); 890 } 891 if (num_pct_s(lessopen) > 1) 892 { 893 error("Invalid LESSOPEN variable", NULL_PARG); 894 return (NULL); 895 } 896 897 len = (int) (strlen(lessopen) + strlen(filename) + 2); 898 cmd = (char *) ecalloc(len, sizeof(char)); 899 SNPRINTF1(cmd, len, lessopen, filename); 900 fd = shellcmd(cmd); 901 free(cmd); 902 if (fd == NULL) 903 { 904 /* 905 * Cannot create the pipe. 906 */ 907 return (NULL); 908 } 909#if HAVE_FILENO 910 if (returnfd) 911 { 912 int f; 913 char c; 914 915 /* 916 * Read one char to see if the pipe will produce any data. 917 * If it does, push the char back on the pipe. 918 */ 919 f = fileno(fd); 920 SET_BINARY(f); 921 if (read(f, &c, 1) != 1) 922 { 923 /* 924 * Pipe is empty. 925 * If more than 1 pipe char was specified, 926 * the exit status tells whether the file itself 927 * is empty, or if there is no alt file. 928 * If only one pipe char, just assume no alt file. 929 */ 930 int status = pclose(fd); 931 if (returnfd > 1 && status == 0) { 932 *pfd = NULL; 933 *pf = -1; 934 return (save(FAKE_EMPTYFILE)); 935 } 936 return (NULL); 937 } 938 ch_ungetchar(c); 939 *pfd = (void *) fd; 940 *pf = f; 941 return (save("-")); 942 } 943#endif 944 cmd = readfd(fd); 945 pclose(fd); 946 if (*cmd == '\0') 947 /* 948 * Pipe is empty. This means there is no alt file. 949 */ 950 return (NULL); 951 return (cmd); 952#endif /* HAVE_POPEN */ 953} 954 955/* 956 * Close a replacement file. 957 */ 958 public void 959close_altfile(altfilename, filename, pipefd) 960 char *altfilename; 961 char *filename; 962 void *pipefd; 963{ 964#if HAVE_POPEN 965 char *lessclose; 966 FILE *fd; 967 char *cmd; 968 int len; 969 970 if (secure) 971 return; 972 if (pipefd != NULL) 973 { 974#if OS2 975 /* 976 * The pclose function of OS/2 emx sometimes fails. 977 * Send SIGINT to the piped process before closing it. 978 */ 979 kill(((FILE*)pipefd)->_pid, SIGINT); 980#endif 981 pclose((FILE*) pipefd); 982 } 983 if ((lessclose = lgetenv("LESSCLOSE")) == NULL) 984 return; 985 if (num_pct_s(lessclose) > 2) 986 { 987 error("Invalid LESSCLOSE variable", NULL_PARG); 988 return; 989 } 990 len = (int) (strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2); 991 cmd = (char *) ecalloc(len, sizeof(char)); 992 SNPRINTF2(cmd, len, lessclose, filename, altfilename); 993 fd = shellcmd(cmd); 994 free(cmd); 995 if (fd != NULL) 996 pclose(fd); 997#endif 998} 999 1000/* 1001 * Is the specified file a directory? 1002 */ 1003 public int 1004is_dir(filename) 1005 char *filename; 1006{ 1007 int isdir = 0; 1008 1009 filename = shell_unquote(filename); 1010#if HAVE_STAT 1011{ 1012 int r; 1013 struct stat statbuf; 1014 1015 r = stat(filename, &statbuf); 1016 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode)); 1017} 1018#else 1019#ifdef _OSK 1020{ 1021 register int f; 1022 1023 f = open(filename, S_IREAD | S_IFDIR); 1024 if (f >= 0) 1025 close(f); 1026 isdir = (f >= 0); 1027} 1028#endif 1029#endif 1030 free(filename); 1031 return (isdir); 1032} 1033 1034/* 1035 * Returns NULL if the file can be opened and 1036 * is an ordinary file, otherwise an error message 1037 * (if it cannot be opened or is a directory, etc.) 1038 */ 1039 public char * 1040bad_file(filename) 1041 char *filename; 1042{ 1043 register char *m = NULL; 1044 1045 filename = shell_unquote(filename); 1046 if (!force_open && is_dir(filename)) 1047 { 1048 static char is_a_dir[] = " is a directory"; 1049 1050 m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir), 1051 sizeof(char)); 1052 strcpy(m, filename); 1053 strcat(m, is_a_dir); 1054 } else 1055 { 1056#if HAVE_STAT 1057 int r; 1058 struct stat statbuf; 1059 1060 r = stat(filename, &statbuf); 1061 if (r < 0) 1062 { 1063 m = errno_message(filename); 1064 } else if (force_open) 1065 { 1066 m = NULL; 1067 } else if (!S_ISREG(statbuf.st_mode)) 1068 { 1069 static char not_reg[] = " is not a regular file (use -f to see it)"; 1070 m = (char *) ecalloc(strlen(filename) + sizeof(not_reg), 1071 sizeof(char)); 1072 strcpy(m, filename); 1073 strcat(m, not_reg); 1074 } 1075#endif 1076 } 1077 free(filename); 1078 return (m); 1079} 1080 1081/* 1082 * Return the size of a file, as cheaply as possible. 1083 * In Unix, we can stat the file. 1084 */ 1085 public POSITION 1086filesize(f) 1087 int f; 1088{ 1089#if HAVE_STAT 1090 struct stat statbuf; 1091 1092 if (fstat(f, &statbuf) >= 0) 1093 return ((POSITION) statbuf.st_size); 1094#else 1095#ifdef _OSK 1096 long size; 1097 1098 if ((size = (long) _gs_size(f)) >= 0) 1099 return ((POSITION) size); 1100#endif 1101#endif 1102 return (seek_filesize(f)); 1103} 1104 1105/* 1106 * 1107 */ 1108 public char * 1109shell_coption() 1110{ 1111 return ("-c"); 1112} 1113 1114/* 1115 * Return last component of a pathname. 1116 */ 1117 public char * 1118last_component(name) 1119 char *name; 1120{ 1121 char *slash; 1122 1123 for (slash = name + strlen(name); slash > name; ) 1124 { 1125 --slash; 1126 if (*slash == *PATHNAME_SEP || *slash == '/') 1127 return (slash + 1); 1128 } 1129 return (name); 1130} 1131 1132