2 * Copyright (C) 1984-2005 Mark Nudelman
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.
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
13 * Routines to mess around with filenames (and files).
14 * Much of this is very OS dependent.
21 #if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER)
24 #if MSDOS_COMPILER==DJGPPC
27 #define _MAX_PATH PATH_MAX
43 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
46 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
51 extern int force_open;
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;
62 * Remove quotes around a filename.
71 name = p = (char *) ecalloc(strlen(str)+1, sizeof(char));
72 if (*str == openquote)
77 if (*str == closequote)
79 if (str[1] != closequote)
87 char *esc = get_meta_escape();
88 int esclen = strlen(esc);
91 if (esclen > 0 && strncmp(str, esc, esclen) == 0)
101 * Get the shell's escape character.
108 s = lgetenv("LESSMETAESCAPE");
115 * Get the characters which the shell considers to be "metacharacters".
120 static char *mchars = NULL;
124 mchars = lgetenv("LESSMETACHARS");
126 mchars = DEF_METACHARS;
132 * Is this a shell metacharacter?
138 return (strchr(metachars(), c) != NULL);
142 * Insert a backslash before each metacharacter in a string.
151 char *esc = get_meta_escape();
152 int esclen = strlen(esc);
157 * Determine how big a string we need to allocate.
159 len = 1; /* Trailing null byte */
160 for (p = s; *p != '\0'; p++)
163 if (*p == openquote || *p == closequote)
170 * We've got a metachar, but this shell
171 * doesn't support escape chars. Use quotes.
177 * Allow space for the escape char.
187 * We can't quote a string that contains quotes.
193 * Allocate and construct the new string.
195 newstr = p = (char *) ecalloc(len, sizeof(char));
198 SNPRINTF3(newstr, len, "%c%s%c", openquote, s, closequote);
206 * Add the escape char.
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.
223 dirfile(dirname, filename)
232 if (dirname == NULL || *dirname == '\0')
235 * Construct the full pathname.
237 len= strlen(dirname) + strlen(filename) + 2;
238 pathname = (char *) calloc(len, sizeof(char));
239 if (pathname == NULL)
241 SNPRINTF3(pathname, len, "%s%s%s", dirname, PATHNAME_SEP, filename);
243 * Make sure the file exists.
245 qpathname = shell_unquote(pathname);
246 f = open(qpathname, OPEN_READ);
260 * Return the full pathname of the given file in the "home directory".
266 register char *pathname;
269 * Try $HOME/filename.
271 pathname = dirfile(lgetenv("HOME"), filename);
272 if (pathname != NULL)
276 * Try $INIT/filename.
278 pathname = dirfile(lgetenv("INIT"), filename);
279 if (pathname != NULL)
282 #if MSDOS_COMPILER || OS2
284 * Look for the file anywhere on search path.
286 pathname = (char *) calloc(_MAX_PATH, sizeof(char));
287 #if MSDOS_COMPILER==DJGPPC
289 char *res = searchpath(filename);
293 strcpy(pathname, res);
296 _searchenv(filename, "PATH", pathname);
298 if (*pathname != '\0')
306 * Expand a string, substituting any "%" with the current filename,
307 * and any "#" with the previous filename.
308 * But a string of N "%"s is just replaced with N-1 "%"s.
309 * Likewise for a string of N "#"s.
310 * {{ This is a lot of work just to support % and #. }}
316 register char *fr, *to;
321 #define fchar_ifile(c) \
322 ((c) == '%' ? curr_ifile : \
323 (c) == '#' ? old_ifile : NULL_IFILE)
326 * Make one pass to see how big a buffer we
327 * need to allocate for the expanded string.
330 for (fr = s; *fr != '\0'; fr++)
336 if (fr > s && fr[-1] == *fr)
339 * Second (or later) char in a string
340 * of identical chars. Treat as normal.
343 } else if (fr[1] != *fr)
346 * Single char (not repeated). Treat specially.
348 ifile = fchar_ifile(*fr);
349 if (ifile == NULL_IFILE)
352 n += strlen(get_filename(ifile));
355 * Else it is the first char in a string of
356 * identical chars. Just discard it.
365 e = (char *) ecalloc(n+1, sizeof(char));
368 * Now copy the string, expanding any "%" or "#".
371 for (fr = s; *fr != '\0'; fr++)
377 if (fr > s && fr[-1] == *fr)
380 } else if (fr[1] != *fr)
382 ifile = fchar_ifile(*fr);
383 if (ifile == NULL_IFILE)
387 strcpy(to, get_filename(ifile));
401 #if TAB_COMPLETE_FILENAME
404 * Return a blank-separated list of filenames which "complete"
417 * Complete the filename "s" by globbing "s*".
419 #if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC)
421 * But in DOS, we have to glob "s*.*".
422 * But if the final component of the filename already has
423 * a dot in it, just do "s*".
424 * (Thus, "FILE" is globbed as "FILE*.*",
425 * but "FILE.A" is globbed as "FILE.A*").
430 for (slash = s+strlen(s)-1; slash > s; slash--)
431 if (*slash == *PATHNAME_SEP || *slash == '/')
434 fpat = (char *) ecalloc(len, sizeof(char));
435 if (strchr(slash, '.') == NULL)
436 SNPRINTF1(fpat, len, "%s*.*", s);
438 SNPRINTF1(fpat, len, "%s*", s);
442 int len = strlen(s) + 2;
443 fpat = (char *) ecalloc(len, sizeof(char));
444 SNPRINTF1(fpat, len, "%s*", s);
448 s = shell_unquote(qs);
449 if (strcmp(s,fpat) == 0)
452 * The filename didn't expand.
464 * Try to determine if a file is "binary".
465 * This is just a guess, and we need not try too hard to make it accurate.
473 unsigned char data[64];
477 if (lseek(f, (off_t)0, 0) == BAD_LSEEK)
479 n = read(f, data, sizeof(data));
480 for (i = 0; i < n; i++)
481 if (binary_char(data[i]))
487 * Try to determine the size of a file by seeking to the end.
495 spos = lseek(f, (off_t)0, 2);
496 if (spos == BAD_LSEEK)
497 return (NULL_POSITION);
498 return ((POSITION) spos);
502 * Read a string from a file.
503 * Return a pointer to the string in memory.
515 * Make a guess about how many chars in the string
516 * and allocate a buffer to hold it.
519 buf = (char *) ecalloc(len, sizeof(char));
522 if ((ch = getc(fd)) == '\n' || ch == EOF)
524 if (p - buf >= len-1)
527 * The string is too big to fit in the buffer we have.
528 * Allocate a new buffer, twice as big.
532 p = (char *) ecalloc(len, sizeof(char));
536 p = buf + strlen(buf);
551 * Execute a shell command.
552 * Return a pointer to a pipe connected to the shell command's standard output.
563 shell = lgetenv("SHELL");
564 if (shell != NULL && *shell != '\0')
570 * Read the output of <$SHELL -c cmd>.
571 * Escape any metacharacters in the command.
573 esccmd = shell_quote(cmd);
576 fd = popen(cmd, "r");
579 int len = strlen(shell) + strlen(esccmd) + 5;
580 scmd = (char *) ecalloc(len, sizeof(char));
581 SNPRINTF3(scmd, len, "%s %s %s", shell, shell_coption(), esccmd);
583 fd = popen(scmd, "r");
589 fd = popen(cmd, "r");
592 * Redirection in `popen' might have messed with the
593 * standard devices. Restore binary input mode.
599 #endif /* HAVE_POPEN */
603 * Expand a filename, doing any system-specific metacharacter substitutions.
612 ofilename = fexpand(filename);
615 filename = shell_unquote(ofilename);
617 #ifdef DECL_GLOB_LIST
620 * The globbing function returns a list of names.
627 GLOB_LIST(filename, list);
628 if (GLOB_LIST_FAILED(list))
633 length = 1; /* Room for trailing null byte */
634 for (SCAN_GLOB_LIST(list, p))
636 INIT_GLOB_LIST(list, p);
637 qfilename = shell_quote(p);
638 if (qfilename != NULL)
640 length += strlen(qfilename) + 1;
644 gfilename = (char *) ecalloc(length, sizeof(char));
645 for (SCAN_GLOB_LIST(list, p))
647 INIT_GLOB_LIST(list, p);
648 qfilename = shell_quote(p);
649 if (qfilename != NULL)
651 sprintf(gfilename + strlen(gfilename), "%s ", qfilename);
656 * Overwrite the final trailing space with a null terminator.
659 GLOB_LIST_DONE(list);
662 #ifdef DECL_GLOB_NAME
665 * The globbing function returns a single name, and
666 * is called multiple times to walk thru all names.
673 DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle)
675 GLOB_FIRST_NAME(filename, &fnd, handle);
676 if (GLOB_FIRST_FAILED(handle))
682 _splitpath(filename, drive, dir, fname, ext);
684 gfilename = (char *) ecalloc(len, sizeof(char));
687 n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1;
688 pathname = (char *) ecalloc(n, sizeof(char));
689 SNPRINTF3(pathname, n, "%s%s%s", drive, dir, fnd.GLOB_NAME);
690 qpathname = shell_quote(pathname);
692 if (qpathname != NULL)
694 n = strlen(qpathname);
695 while (p - gfilename + n + 2 >= len)
698 * No room in current buffer.
699 * Allocate a bigger one.
703 p = (char *) ecalloc(len, sizeof(char));
704 strcpy(p, gfilename);
707 p = gfilename + strlen(gfilename);
709 strcpy(p, qpathname);
714 } while (GLOB_NEXT_NAME(handle, &fnd) == 0);
717 * Overwrite the final trailing space with a null terminator.
720 GLOB_NAME_DONE(handle);
726 * We get the shell to glob the filename for us by passing
727 * an "echo" command to the shell and reading its output.
736 esc = get_meta_escape();
737 if (strlen(esc) == 0)
739 esc = shell_quote(esc);
745 lessecho = lgetenv("LESSECHO");
746 if (lessecho == NULL || *lessecho == '\0')
747 lessecho = "lessecho";
749 * Invoke lessecho, and read its output (a globbed list of filenames).
751 len = strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24;
752 cmd = (char *) ecalloc(len, sizeof(char));
753 SNPRINTF4(cmd, len, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, closequote, esc);
755 for (s = metachars(); *s != '\0'; s++)
756 sprintf(cmd + strlen(cmd), "-n0x%x ", *s);
757 sprintf(cmd + strlen(cmd), "-- %s", ofilename);
763 * Cannot create the pipe.
764 * Just return the original (fexpanded) filename.
769 gfilename = readfd(fd);
771 if (*gfilename == '\0')
780 * No globbing functions at all. Just use the fexpanded filename.
782 gfilename = save(filename);
792 * See if we should open a "replacement file"
793 * instead of the file we're about to open.
796 open_altfile(filename, pf, pfd)
812 if (!use_lessopen || secure)
815 if ((lessopen = lgetenv("LESSOPEN")) == NULL)
817 if (strcmp(filename, "-") == 0)
819 if (*lessopen == '|')
822 * If LESSOPEN starts with a |, it indicates
823 * a "pipe preprocessor".
829 error("LESSOPEN pipe is not supported", NULL_PARG);
834 len = strlen(lessopen) + strlen(filename) + 2;
835 cmd = (char *) ecalloc(len, sizeof(char));
836 SNPRINTF1(cmd, len, lessopen, filename);
842 * Cannot create the pipe.
853 * Read one char to see if the pipe will produce any data.
854 * If it does, push the char back on the pipe.
858 if (read(f, &c, 1) != 1)
861 * Pipe is empty. This means there is no alt file.
876 * Pipe is empty. This means there is no alt file.
880 #endif /* HAVE_POPEN */
884 * Close a replacement file.
887 close_altfile(altfilename, filename, pipefd)
904 * The pclose function of OS/2 emx sometimes fails.
905 * Send SIGINT to the piped process before closing it.
907 kill(((FILE*)pipefd)->_pid, SIGINT);
909 pclose((FILE*) pipefd);
911 if ((lessclose = lgetenv("LESSCLOSE")) == NULL)
913 len = strlen(lessclose) + strlen(filename) + strlen(altfilename) + 2;
914 cmd = (char *) ecalloc(len, sizeof(char));
915 SNPRINTF2(cmd, len, lessclose, filename, altfilename);
924 * Is the specified file a directory?
932 filename = shell_unquote(filename);
938 r = stat(filename, &statbuf);
939 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode));
946 f = open(filename, S_IREAD | S_IFDIR);
958 * Returns NULL if the file can be opened and
959 * is an ordinary file, otherwise an error message
960 * (if it cannot be opened or is a directory, etc.)
966 register char *m = NULL;
968 filename = shell_unquote(filename);
969 if (is_dir(filename))
971 static char is_a_dir[] = " is a directory";
973 m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir),
983 r = stat(filename, &statbuf);
986 m = errno_message(filename);
987 } else if (force_open)
990 } else if (!S_ISREG(statbuf.st_mode))
992 static char not_reg[] = " is not a regular file (use -f to see it)";
993 m = (char *) ecalloc(strlen(filename) + sizeof(not_reg),
1005 * Return the size of a file, as cheaply as possible.
1006 * In Unix, we can stat the file.
1013 struct stat statbuf;
1015 if (fstat(f, &statbuf) >= 0)
1016 return ((POSITION) statbuf.st_size);
1021 if ((size = (long) _gs_size(f)) >= 0)
1022 return ((POSITION) size);
1025 return (seek_filesize(f));