2 * Copyright (C) 1984-2002 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 sprintf(newstr, "%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)
231 if (dirname == NULL || *dirname == '\0')
234 * Construct the full pathname.
236 pathname = (char *) calloc(strlen(dirname) + strlen(filename) + 2,
238 if (pathname == NULL)
240 sprintf(pathname, "%s%s%s", dirname, PATHNAME_SEP, filename);
242 * Make sure the file exists.
244 qpathname = shell_unquote(pathname);
245 f = open(qpathname, OPEN_READ);
259 * Return the full pathname of the given file in the "home directory".
265 register char *pathname;
268 * Try $HOME/filename.
270 pathname = dirfile(lgetenv("HOME"), filename);
271 if (pathname != NULL)
275 * Try $INIT/filename.
277 pathname = dirfile(lgetenv("INIT"), filename);
278 if (pathname != NULL)
281 #if MSDOS_COMPILER || OS2
283 * Look for the file anywhere on search path.
285 pathname = (char *) calloc(_MAX_PATH, sizeof(char));
286 #if MSDOS_COMPILER==DJGPPC
288 char *res = searchpath(filename);
292 strcpy(pathname, res);
295 _searchenv(filename, "PATH", pathname);
297 if (*pathname != '\0')
305 * Expand a string, substituting any "%" with the current filename,
306 * and any "#" with the previous filename.
307 * But a string of N "%"s is just replaced with N-1 "%"s.
308 * Likewise for a string of N "#"s.
309 * {{ This is a lot of work just to support % and #. }}
315 register char *fr, *to;
320 #define fchar_ifile(c) \
321 ((c) == '%' ? curr_ifile : \
322 (c) == '#' ? old_ifile : NULL_IFILE)
325 * Make one pass to see how big a buffer we
326 * need to allocate for the expanded string.
329 for (fr = s; *fr != '\0'; fr++)
335 if (fr > s && fr[-1] == *fr)
338 * Second (or later) char in a string
339 * of identical chars. Treat as normal.
342 } else if (fr[1] != *fr)
345 * Single char (not repeated). Treat specially.
347 ifile = fchar_ifile(*fr);
348 if (ifile == NULL_IFILE)
351 n += strlen(get_filename(ifile));
354 * Else it is the first char in a string of
355 * identical chars. Just discard it.
364 e = (char *) ecalloc(n+1, sizeof(char));
367 * Now copy the string, expanding any "%" or "#".
370 for (fr = s; *fr != '\0'; fr++)
376 if (fr > s && fr[-1] == *fr)
379 } else if (fr[1] != *fr)
381 ifile = fchar_ifile(*fr);
382 if (ifile == NULL_IFILE)
386 strcpy(to, get_filename(ifile));
400 #if TAB_COMPLETE_FILENAME
403 * Return a blank-separated list of filenames which "complete"
416 * Complete the filename "s" by globbing "s*".
418 #if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC)
420 * But in DOS, we have to glob "s*.*".
421 * But if the final component of the filename already has
422 * a dot in it, just do "s*".
423 * (Thus, "FILE" is globbed as "FILE*.*",
424 * but "FILE.A" is globbed as "FILE.A*").
428 for (slash = s+strlen(s)-1; slash > s; slash--)
429 if (*slash == *PATHNAME_SEP || *slash == '/')
431 fpat = (char *) ecalloc(strlen(s)+4, sizeof(char));
432 if (strchr(slash, '.') == NULL)
433 sprintf(fpat, "%s*.*", s);
435 sprintf(fpat, "%s*", s);
438 fpat = (char *) ecalloc(strlen(s)+2, sizeof(char));
439 sprintf(fpat, "%s*", s);
442 s = shell_unquote(qs);
443 if (strcmp(s,fpat) == 0)
446 * The filename didn't expand.
458 * Try to determine if a file is "binary".
459 * This is just a guess, and we need not try too hard to make it accurate.
467 unsigned char data[64];
471 if (lseek(f, (off_t)0, 0) == BAD_LSEEK)
473 n = read(f, data, sizeof(data));
474 for (i = 0; i < n; i++)
475 if (binary_char(data[i]))
481 * Try to determine the size of a file by seeking to the end.
489 spos = lseek(f, (off_t)0, 2);
490 if (spos == BAD_LSEEK)
491 return (NULL_POSITION);
492 return ((POSITION) spos);
496 * Read a string from a file.
497 * Return a pointer to the string in memory.
509 * Make a guess about how many chars in the string
510 * and allocate a buffer to hold it.
513 buf = (char *) ecalloc(len, sizeof(char));
516 if ((ch = getc(fd)) == '\n' || ch == EOF)
518 if (p - buf >= len-1)
521 * The string is too big to fit in the buffer we have.
522 * Allocate a new buffer, twice as big.
526 p = (char *) ecalloc(len, sizeof(char));
530 p = buf + strlen(buf);
545 * Execute a shell command.
546 * Return a pointer to a pipe connected to the shell command's standard output.
557 shell = lgetenv("SHELL");
558 if (shell != NULL && *shell != '\0')
564 * Read the output of <$SHELL -c cmd>.
565 * Escape any metacharacters in the command.
567 esccmd = shell_quote(cmd);
570 fd = popen(cmd, "r");
573 scmd = (char *) ecalloc(strlen(shell) + strlen(esccmd) + 5,
575 sprintf(scmd, "%s %s %s", shell, shell_coption(), esccmd);
577 fd = popen(scmd, "r");
583 fd = popen(cmd, "r");
586 * Redirection in `popen' might have messed with the
587 * standard devices. Restore binary input mode.
593 #endif /* HAVE_POPEN */
597 * Expand a filename, doing any system-specific metacharacter substitutions.
606 ofilename = fexpand(filename);
609 filename = shell_unquote(ofilename);
611 #ifdef DECL_GLOB_LIST
614 * The globbing function returns a list of names.
621 GLOB_LIST(filename, list);
622 if (GLOB_LIST_FAILED(list))
627 length = 1; /* Room for trailing null byte */
628 for (SCAN_GLOB_LIST(list, p))
630 INIT_GLOB_LIST(list, p);
631 qfilename = shell_quote(p);
632 if (qfilename != NULL)
634 length += strlen(qfilename) + 1;
638 gfilename = (char *) ecalloc(length, sizeof(char));
639 for (SCAN_GLOB_LIST(list, p))
641 INIT_GLOB_LIST(list, p);
642 qfilename = shell_quote(p);
643 if (qfilename != NULL)
645 sprintf(gfilename + strlen(gfilename), "%s ", qfilename);
650 * Overwrite the final trailing space with a null terminator.
653 GLOB_LIST_DONE(list);
656 #ifdef DECL_GLOB_NAME
659 * The globbing function returns a single name, and
660 * is called multiple times to walk thru all names.
667 DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle)
669 GLOB_FIRST_NAME(filename, &fnd, handle);
670 if (GLOB_FIRST_FAILED(handle))
676 _splitpath(filename, drive, dir, fname, ext);
678 gfilename = (char *) ecalloc(len, sizeof(char));
681 n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1;
682 pathname = (char *) ecalloc(n, sizeof(char));
683 sprintf(pathname, "%s%s%s", drive, dir, fnd.GLOB_NAME);
684 qpathname = shell_quote(pathname);
686 if (qpathname != NULL)
688 n = strlen(qpathname);
689 while (p - gfilename + n + 2 >= len)
692 * No room in current buffer.
693 * Allocate a bigger one.
697 p = (char *) ecalloc(len, sizeof(char));
698 strcpy(p, gfilename);
701 p = gfilename + strlen(gfilename);
703 strcpy(p, qpathname);
708 } while (GLOB_NEXT_NAME(handle, &fnd) == 0);
711 * Overwrite the final trailing space with a null terminator.
714 GLOB_NAME_DONE(handle);
720 * We get the shell to glob the filename for us by passing
721 * an "echo" command to the shell and reading its output.
729 esc = get_meta_escape();
730 if (strlen(esc) == 0)
732 esc = shell_quote(esc);
738 lessecho = lgetenv("LESSECHO");
739 if (lessecho == NULL || *lessecho == '\0')
740 lessecho = "lessecho";
742 * Invoke lessecho, and read its output (a globbed list of filenames).
744 cmd = (char *) ecalloc(strlen(lessecho) + strlen(ofilename) + (7*strlen(metachars())) + 24, sizeof(char));
745 sprintf(cmd, "%s -p0x%x -d0x%x -e%s ", lessecho, openquote, closequote, esc);
747 for (s = metachars(); *s != '\0'; s++)
748 sprintf(cmd + strlen(cmd), "-n0x%x ", *s);
749 sprintf(cmd + strlen(cmd), "-- %s", ofilename);
755 * Cannot create the pipe.
756 * Just return the original (fexpanded) filename.
761 gfilename = readfd(fd);
763 if (*gfilename == '\0')
772 * No globbing functions at all. Just use the fexpanded filename.
774 gfilename = save(filename);
784 * See if we should open a "replacement file"
785 * instead of the file we're about to open.
788 open_altfile(filename, pf, pfd)
803 if (!use_lessopen || secure)
806 if ((lessopen = lgetenv("LESSOPEN")) == NULL)
808 if (strcmp(filename, "-") == 0)
810 if (*lessopen == '|')
813 * If LESSOPEN starts with a |, it indicates
814 * a "pipe preprocessor".
820 error("LESSOPEN pipe is not supported", NULL_PARG);
825 cmd = (char *) ecalloc(strlen(lessopen) + strlen(filename) + 2,
827 sprintf(cmd, lessopen, filename);
833 * Cannot create the pipe.
844 * Read one char to see if the pipe will produce any data.
845 * If it does, push the char back on the pipe.
849 if (read(f, &c, 1) != 1)
852 * Pipe is empty. This means there is no alt file.
867 * Pipe is empty. This means there is no alt file.
871 #endif /* HAVE_POPEN */
875 * Close a replacement file.
878 close_altfile(altfilename, filename, pipefd)
894 * The pclose function of OS/2 emx sometimes fails.
895 * Send SIGINT to the piped process before closing it.
897 kill(((FILE*)pipefd)->_pid, SIGINT);
899 pclose((FILE*) pipefd);
901 if ((lessclose = lgetenv("LESSCLOSE")) == NULL)
903 cmd = (char *) ecalloc(strlen(lessclose) + strlen(filename) +
904 strlen(altfilename) + 2, sizeof(char));
905 sprintf(cmd, lessclose, filename, altfilename);
914 * Is the specified file a directory?
922 filename = shell_unquote(filename);
928 r = stat(filename, &statbuf);
929 isdir = (r >= 0 && S_ISDIR(statbuf.st_mode));
936 f = open(filename, S_IREAD | S_IFDIR);
948 * Returns NULL if the file can be opened and
949 * is an ordinary file, otherwise an error message
950 * (if it cannot be opened or is a directory, etc.)
956 register char *m = NULL;
958 filename = shell_unquote(filename);
959 if (is_dir(filename))
961 static char is_a_dir[] = " is a directory";
963 m = (char *) ecalloc(strlen(filename) + sizeof(is_a_dir),
973 r = stat(filename, &statbuf);
976 m = errno_message(filename);
977 } else if (force_open)
980 } else if (!S_ISREG(statbuf.st_mode))
982 static char not_reg[] = " is not a regular file (use -f to see it)";
983 m = (char *) ecalloc(strlen(filename) + sizeof(not_reg),
995 * Return the size of a file, as cheaply as possible.
996 * In Unix, we can stat the file.
1003 struct stat statbuf;
1005 if (fstat(f, &statbuf) >= 0)
1006 return ((POSITION) statbuf.st_size);
1011 if ((size = (long) _gs_size(f)) >= 0)
1012 return ((POSITION) size);
1015 return (seek_filesize(f));