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1998-03-03
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/*
* Copyright (c) 1984,1985,1989,1994,1995,1996 Mark Nudelman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Routines to mess around with filenames (and files).
* Much of this is very OS dependent.
*/
#include "less.h"
#include "lglob.h"
#if MSDOS_COMPILER
#include <dos.h>
#if MSDOS_COMPILER==WIN32C && !defined(_MSC_VER)
#include <dir.h>
#endif
#if MSDOS_COMPILER==DJGPPC
#include <glob.h>
#include <dir.h>
#include <limits.h>
#define _MAX_PATH PATH_MAX
#endif
#endif
#ifdef _OSK
#include <rbf.h>
#ifndef _OSK_MWC32
#include <modes.h>
#endif
#endif
#if HAVE_STAT
#include <sys/stat.h>
#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#ifndef S_ISREG
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
#endif
extern int force_open;
extern int secure;
extern IFILE curr_ifile;
extern IFILE old_ifile;
#if SPACES_IN_FILENAMES
extern char openquote;
extern char closequote;
#endif
/*
* Remove quotes around a filename.
*/
public char *
unquote_file(str)
char *str;
{
#if SPACES_IN_FILENAMES
char *name;
char *p;
if (*str != openquote)
return (save(str));
name = (char *) ecalloc(strlen(str), sizeof(char));
strcpy(name, str+1);
p = name + strlen(name) - 1;
if (*p == closequote)
*p = '\0';
return (name);
#else
return (save(str));
#endif
}
/*
* Return a pathname that points to a specified file in a specified directory.
* Return NULL if the file does not exist in the directory.
*/
static char *
dirfile(dirname, filename)
char *dirname;
char *filename;
{
char *pathname;
char *qpathname;
int f;
if (dirname == NULL || *dirname == '\0')
return (NULL);
/*
* Construct the full pathname.
*/
pathname = (char *) calloc(strlen(dirname) + strlen(filename) + 2,
sizeof(char));
if (pathname == NULL)
return (NULL);
sprintf(pathname, "%s%s%s", dirname, PATHNAME_SEP, filename);
/*
* Make sure the file exists.
*/
qpathname = unquote_file(pathname);
f = open(qpathname, OPEN_READ);
if (f < 0)
{
free(pathname);
pathname = NULL;
} else
{
close(f);
}
free(qpathname);
return (pathname);
}
/*
* Return the full pathname of the given file in the "home directory".
*/
public char *
homefile(filename)
char *filename;
{
register char *pathname;
/*
* Try $HOME/filename.
*/
pathname = dirfile(lgetenv("HOME"), filename);
if (pathname != NULL)
return (pathname);
#if OS2
/*
* Try $INIT/filename.
*/
pathname = dirfile(lgetenv("INIT"), filename);
if (pathname != NULL)
return (pathname);
#endif
#if MSDOS_COMPILER || OS2
/*
* Look for the file anywhere on search path.
*/
pathname = (char *) calloc(_MAX_PATH, sizeof(char));
#if MSDOS_COMPILER==DJGPPC
{
char *res = searchpath(filename);
if (res == 0)
*pathname = '\0';
else
strcpy(pathname, res);
}
#else
_searchenv(filename, "PATH", pathname);
#endif
if (*pathname != '\0')
return (pathname);
free(pathname);
#endif
return (NULL);
}
/*
* Expand a string, substituting any "%" with the current filename,
* and any "#" with the previous filename.
* But a string of N "%"s is just replaced with N-1 "%"s.
* Likewise for a string of N "#"s.
* {{ This is a lot of work just to support % and #. }}
*/
public char *
fexpand(s)
char *s;
{
register char *fr, *to;
register int n;
register char *e;
IFILE ifile;
#define fchar_ifile(c) \
((c) == '%' ? curr_ifile : \
(c) == '#' ? old_ifile : NULL_IFILE)
/*
* Make one pass to see how big a buffer we
* need to allocate for the expanded string.
*/
n = 0;
for (fr = s; *fr != '\0'; fr++)
{
switch (*fr)
{
case '%':
case '#':
if (fr > s && fr[-1] == *fr)
{
/*
* Second (or later) char in a string
* of identical chars. Treat as normal.
*/
n++;
} else if (fr[1] != *fr)
{
/*
* Single char (not repeated). Treat specially.
*/
ifile = fchar_ifile(*fr);
if (ifile == NULL_IFILE)
n++;
else
n += strlen(get_filename(ifile));
}
/*
* Else it is the first char in a string of
* identical chars. Just discard it.
*/
break;
default:
n++;
break;
}
}
e = (char *) ecalloc(n+1, sizeof(char));
/*
* Now copy the string, expanding any "%" or "#".
*/
to = e;
for (fr = s; *fr != '\0'; fr++)
{
switch (*fr)
{
case '%':
case '#':
if (fr > s && fr[-1] == *fr)
{
*to++ = *fr;
} else if (fr[1] != *fr)
{
ifile = fchar_ifile(*fr);
if (ifile == NULL_IFILE)
*to++ = *fr;
else
{
strcpy(to, get_filename(ifile));
to += strlen(to);
}
}
break;
default:
*to++ = *fr;
break;
}
}
*to = '\0';
return (e);
}
#if TAB_COMPLETE_FILENAME
/*
* Return a blank-separated list of filenames which "complete"
* the given string.
*/
public char *
fcomplete(s)
char *s;
{
char *fpat;
if (secure)
return (NULL);
/*
* Complete the filename "s" by globbing "s*".
*/
#if MSDOS_COMPILER && (MSDOS_COMPILER == MSOFTC || MSDOS_COMPILER == BORLANDC)
/*
* But in DOS, we have to glob "s*.*".
* But if the final component of the filename already has
* a dot in it, just do "s*".
* (Thus, "FILE" is globbed as "FILE*.*",
* but "FILE.A" is globbed as "FILE.A*").
*/
{
char *slash;
for (slash = s+strlen(s)-1; slash > s; slash--)
if (*slash == *PATHNAME_SEP || *slash == '/')
break;
fpat = (char *) ecalloc(strlen(s)+4, sizeof(char));
if (strchr(slash, '.') == NULL)
sprintf(fpat, "%s*.*", s);
else
sprintf(fpat, "%s*", s);
}
#else
fpat = (char *) ecalloc(strlen(s)+2, sizeof(char));
sprintf(fpat, "%s*", s);
#endif
s = lglob(fpat);
if (strcmp(s,fpat) == 0)
{
/*
* The filename didn't expand.
*/
free(s);
s = NULL;
}
free(fpat);
return (s);
}
#endif
/*
* Try to determine if a file is "binary".
* This is just a guess, and we need not try too hard to make it accurate.
*/
public int
bin_file(f)
int f;
{
int i;
int n;
unsigned char data[64];
if (!seekable(f))
return (0);
if (lseek(f, (off_t)0, 0) == BAD_LSEEK)
return (0);
n = read(f, data, sizeof(data));
for (i = 0; i < n; i++)
if (binary_char(data[i]))
return (1);
return (0);
}
/*
* Try to determine the size of a file by seeking to the end.
*/
static POSITION
seek_filesize(f)
int f;
{
off_t spos;
spos = lseek(f, (off_t)0, 2);
if (spos == BAD_LSEEK)
return (NULL_POSITION);
return ((POSITION) spos);
}
#if HAVE_POPEN
FILE *popen();
/*
* Read a string from a file.
* Return a pointer to the string in memory.
*/
static char *
readfd(fd)
FILE *fd;
{
int len;
int ch;
char *buf;
char *p;
/*
* Make a guess about how many chars in the string
* and allocate a buffer to hold it.
*/
len = 100;
buf = (char *) ecalloc(len, sizeof(char));
for (p = buf; ; p++)
{
if ((ch = getc(fd)) == '\n' || ch == EOF)
break;
if (p - buf >= len-1)
{
/*
* The string is too big to fit in the buffer we have.
* Allocate a new buffer, twice as big.
*/
len *= 2;
*p = '\0';
p = (char *) ecalloc(len, sizeof(char));
strcpy(p, buf);
free(buf);
buf = p;
p = buf + strlen(buf);
}
*p = ch;
}
*p = '\0';
return (buf);
}
#if HAVE_SHELL
/*
* Get the shell's escape character.
*/
static char *
get_meta_escape()
{
char *s;
s = lgetenv("LESSMETAESCAPE");
if (s == NULL)
s = DEF_METAESCAPE;
return (s);
}
/*
* Is this a shell metacharacter?
*/
static int
metachar(c)
char c;
{
static char *metachars = NULL;
if (metachars == NULL)
{
metachars = lgetenv("LESSMETACHARS");
if (metachars == NULL)
metachars = DEF_METACHARS;
}
return (strchr(metachars, c) != NULL);
}
/*
* Insert a backslash before each metacharacter in a string.
*/
static char *
esc_metachars(s)
char *s;
{
char *p;
char *newstr;
int len;
char *esc;
int esclen;
/*
* Determine how big a string we need to allocate.
*/
esc = get_meta_escape();
esclen = strlen(esc);
len = 1; /* Trailing null byte */
for (p = s; *p != '\0'; p++)
{
len++;
if (metachar(*p))
{
if (*esc == '\0')
{
/*
* We've got a metachar, but this shell
* doesn't support escape chars. Give up.
*/
return (NULL);
}
/*
* Allow space for the escape char.
*/
len += esclen;
}
}
/*
* Allocate and construct the new string.
*/
newstr = p = (char *) ecalloc(len, sizeof(char));
while (*s != '\0')
{
if (metachar(*s))
{
/*
* Add the escape char.
*/
strcpy(p, esc);
p += esclen;
}
*p++ = *s++;
}
*p = '\0';
return (newstr);
}
#else /* HAVE_SHELL */
static char *
esc_metachars(s)
char *s;
{
return (save(s));
}
#endif /* HAVE_SHELL */
/*
* Execute a shell command.
* Return a pointer to a pipe connected to the shell command's standard output.
*/
static FILE *
shellcmd(cmd)
char *cmd;
{
FILE *fd;
#if HAVE_SHELL
char *shell;
shell = lgetenv("SHELL");
if (shell != NULL && *shell != '\0')
{
char *scmd;
char *esccmd;
/*
* Try to escape any metacharacters in the command.
* If we can't do that, just put the command in quotes.
* (But that doesn't work well if the command itself
* contains quotes.)
*/
if ((esccmd = esc_metachars(cmd)) == NULL)
{
/*
* Cannot escape the metacharacters, so use quotes.
* Read the output of <$SHELL -c "cmd">.
*/
scmd = (char *) ecalloc(strlen(shell) + strlen(cmd) + 7,
sizeof(char));
sprintf(scmd, "%s -c \"%s\"", shell, cmd);
} else
{
/*
* Read the output of <$SHELL -c cmd>.
* No quotes; use the escaped cmd.
*/
scmd = (char *) ecalloc(strlen(shell) + strlen(esccmd) + 5,
sizeof(char));
sprintf(scmd, "%s -c %s", shell, esccmd);
free(esccmd);
}
fd = popen(scmd, "r");
free(scmd);
} else
#endif
{
fd = popen(cmd, "r");
/*
* Redirection in `popen' might have messed with the
* standard devices. Restore binary input mode.
*/
SET_BINARY(0);
}
return (fd);
}
#endif /* HAVE_POPEN */
/*
* Expand a filename, doing any system-specific metacharacter substitutions.
*/
public char *
lglob(filename)
char *filename;
{
char *gfilename;
char *ofilename;
ofilename = fexpand(filename);
if (secure)
return (ofilename);
filename = unquote_file(ofilename);
#ifdef DECL_GLOB_LIST
{
/*
* The globbing function returns a list of names.
*/
int length;
char *p;
DECL_GLOB_LIST(list)
GLOB_LIST(filename, list);
if (GLOB_LIST_FAILED(list))
{
free(filename);
return (ofilename);
}
length = 1; /* Room for trailing null byte */
for (SCAN_GLOB_LIST(list, p))
{
INIT_GLOB_LIST(list, p);
length += strlen(p) + 1;
#if SPACES_IN_FILENAMES
if (strchr(p, ' ') != NULL)
length += 2; /* Allow for quotes */
#endif
}
gfilename = (char *) ecalloc(length, sizeof(char));
for (SCAN_GLOB_LIST(list, p))
{
INIT_GLOB_LIST(list, p);
#if SPACES_IN_FILENAMES
if (strchr(p, ' ') != NULL)
sprintf(gfilename + strlen(gfilename), "%c%s%c ",
openquote, p, closequote);
else
#endif
sprintf(gfilename + strlen(gfilename), "%s ", p);
}
/*
* Overwrite the final trailing space with a null terminator.
*/
*--p = '\0';
GLOB_LIST_DONE(list);
}
#else
#ifdef DECL_GLOB_NAME
{
/*
* The globbing function returns a single name, and
* is called multiple times to walk thru all names.
*/
register char *p;
register int len;
register int n;
#if SPACES_IN_FILENAMES
register int spaces_in_file;
#endif
DECL_GLOB_NAME(fnd,drive,dir,fname,ext,handle)
GLOB_FIRST_NAME(filename, &fnd, handle);
if (GLOB_FIRST_FAILED(handle))
{
free(filename);
return (ofilename);
}
_splitpath(filename, drive, dir, fname, ext);
len = 100;
gfilename = (char *) ecalloc(len, sizeof(char));
p = gfilename;
do {
n = strlen(drive) + strlen(dir) + strlen(fnd.GLOB_NAME) + 1;
#if SPACES_IN_FILENAMES
spaces_in_file = 0;
if (strchr(fnd.GLOB_NAME, ' ') != NULL ||
strchr(filename, ' ') != NULL)
{
spaces_in_file = 1;
n += 2;
}
#endif
while (p - gfilename + n+2 >= len)
{
/*
* No room in current buffer. Allocate a bigger one.
*/
len *= 2;
*p = '\0';
p = (char *) ecalloc(len, sizeof(char));
strcpy(p, gfilename);
free(gfilename);
gfilename = p;
p = gfilename + strlen(gfilename);
}
#if SPACES_IN_FILENAMES
if (spaces_in_file)
sprintf(p, "%c%s%s%s%c ", openquote,
drive, dir, fnd.GLOB_NAME, closequote);
else
#endif
sprintf(p, "%s%s%s ", drive, dir, fnd.GLOB_NAME);
p += n;
} while (GLOB_NEXT_NAME(handle, &fnd) == 0);
/*
* Overwrite the final trailing space with a null terminator.
*/
*--p = '\0';
GLOB_NAME_DONE(handle);
}
#else
#if HAVE_POPEN
{
/*
* We get the shell to glob the filename for us by passing
* an "echo" command to the shell and reading its output.
*/
FILE *fd;
char *s;
char *lessecho;
char *cmd;
lessecho = lgetenv("LESSECHO");
if (lessecho == NULL || *lessecho == '\0')
lessecho = "lessecho";
s = esc_metachars(filename);
if (s == NULL)
{
/*
* There may be dangerous metachars in this name.
* We can't risk passing it to the shell.
* {{ For example, do "!;TAB" when the first file
* in the dir is named "rm". }}
*/
free(filename);
return (ofilename);
}
/*
* Invoke lessecho, and read its output (a globbed list of filenames).
*/
cmd = (char *) ecalloc(strlen(lessecho) + strlen(s) + 24, sizeof(char));
sprintf(cmd, "%s -p0x%x -d0x%x -- %s",
lessecho, openquote, closequote, s);
fd = shellcmd(cmd);
free(s);
free(cmd);
if (fd == NULL)
{
/*
* Cannot create the pipe.
* Just return the original (fexpanded) filename.
*/
free(filename);
return (ofilename);
}
gfilename = readfd(fd);
pclose(fd);
if (*gfilename == '\0')
{
free(gfilename);
free(filename);
return (ofilename);
}
}
#else
/*
* No globbing functions at all. Just use the fexpanded filename.
*/
gfilename = save(filename);
#endif
#endif
#endif
free(filename);
free(ofilename);
return (gfilename);
}
/*
* See if we should open a "replacement file"
* instead of the file we're about to open.
*/
public char *
open_altfile(filename, pf, pfd)
char *filename;
int *pf;
void **pfd;
{
#if !HAVE_POPEN
return (NULL);
#else
char *lessopen;
char *gfilename;
char *cmd;
FILE *fd;
#if HAVE_FILENO
int returnfd = 0;
#endif
if (secure)
return (NULL);
ch_ungetchar(-1);
if ((lessopen = lgetenv("LESSOPEN")) == NULL)
return (NULL);
if (strcmp(filename, "-") == 0)
return (NULL);
if (*lessopen == '|')
{
/*
* If LESSOPEN starts with a |, it indicates
* a "pipe preprocessor".
*/
#if HAVE_FILENO
lessopen++;
returnfd = 1;
#else
error("LESSOPEN pipe is not supported", NULL_PARG);
return (NULL);
#endif
}
gfilename = esc_metachars(filename);
if (gfilename == NULL)
{
/*
* Cannot escape metacharacters.
*/
return (NULL);
}
cmd = (char *) ecalloc(strlen(lessopen) + strlen(gfilename) + 2,
sizeof(char));
sprintf(cmd, lessopen, gfilename);
fd = shellcmd(cmd);
free(gfilename);
free(cmd);
if (fd == NULL)
{
/*
* Cannot create the pipe.
*/
return (NULL);
}
#if HAVE_FILENO
if (returnfd)
{
int f;
char c;
/*
* Read one char to see if the pipe will produce any data.
* If it does, push the char back on the pipe.
*/
f = fileno(fd);
SET_BINARY(f);
if (read(f, &c, 1) != 1)
{
/*
* Pipe is empty. This means there is no alt file.
*/
pclose(fd);
return (NULL);
}
ch_ungetchar(c);
*pfd = (void *) fd;
*pf = f;
return (save("-"));
}
#endif
gfilename = readfd(fd);
pclose(fd);
if (*gfilename == '\0')
/*
* Pipe is empty. This means there is no alt file.
*/
return (NULL);
return (gfilename);
#endif /* HAVE_POPEN */
}
/*
* Close a replacement file.
*/
public void
close_altfile(altfilename, filename, pipefd)
char *altfilename;
char *filename;
void *pipefd;
{
#if HAVE_POPEN
char *lessclose;
char *gfilename;
char *galtfilename;
FILE *fd;
char *cmd;
if (secure)
return;
if (pipefd != NULL)
pclose((FILE*) pipefd);
if ((lessclose = lgetenv("LESSCLOSE")) == NULL)
return;
gfilename = esc_metachars(filename);
if (gfilename == NULL)
{
return;
}
galtfilename = esc_metachars(altfilename);
if (galtfilename == NULL)
{
free(gfilename);
return;
}
cmd = (char *) ecalloc(strlen(lessclose) + strlen(gfilename) +
strlen(galtfilename) + 2, sizeof(char));
sprintf(cmd, lessclose, gfilename, galtfilename);
fd = shellcmd(cmd);
free(galtfilename);
free(gfilename);
free(cmd);
if (fd != NULL)
pclose(fd);
#endif
}
/*
* Is the specified file a directory?
*/
public int
is_dir(filename)
char *filename;
{
int isdir = 0;
filename = unquote_file(filename);
#if HAVE_STAT
{
int r;
struct stat statbuf;
r = stat(filename, &statbuf);
isdir = (r >= 0 && S_ISDIR(statbuf.st_mode));
}
#else
#ifdef _OSK
{
register int f;
f = open(filename, S_IREAD | S_IFDIR);
if (f >= 0)
close(f);
isdir = (f >= 0);
}
#endif
#endif
free(filename);
return (isdir);
}
/*
* Returns NULL if the file can be opened and
* is an ordinary file, otherwise an error message
* (if it cannot be opened or is a directory, etc.)
*/
public char *
bad_file(filename)
char *filename;
{
register char *m = NULL;
filename = unquote_file(filename);
if (is_dir(filename))
{
static char is_dir[] = " is a directory";
m = (char *) ecalloc(strlen(filename) + sizeof(is_dir),
sizeof(char));
strcpy(m, filename);
strcat(m, is_dir);
} else
{
#if HAVE_STAT
int r;
struct stat statbuf;
r = stat(filename, &statbuf);
if (r < 0)
{
m = errno_message(filename);
} else if (force_open)
{
m = NULL;
} else if (!S_ISREG(statbuf.st_mode))
{
static char not_reg[] = " is not a regular file (use -f to see it)";
m = (char *) ecalloc(strlen(filename) + sizeof(not_reg),
sizeof(char));
strcpy(m, filename);
strcat(m, not_reg);
}
#endif
}
free(filename);
return (m);
}
/*
* Return the size of a file, as cheaply as possible.
* In Unix, we can stat the file.
*/
public POSITION
filesize(f)
int f;
{
#if HAVE_STAT
struct stat statbuf;
if (fstat(f, &statbuf) >= 0)
return ((POSITION) statbuf.st_size);
#else
#ifdef _OSK
long size;
if ((size = (long) _gs_size(f)) >= 0)
return ((POSITION) size);
#else
return (seek_filesize(f));
#endif
#endif
}