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yap-6.3/os/pl-files.c

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2011, University of Amsterdam
VU University Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "pl-incl.h"
#include "pl-utf8.h"
#include <stdio.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef O_XOS
#define statstruct struct _stati64
#else
#define statstruct struct stat
#define statfunc stat
#endif
#undef LD
#define LD LOCAL_LD
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
General file operations and binding to Prolog
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef __WINDOWS__
static void
set_posix_error(int win_error)
{ int error = 0;
switch(win_error)
{ case ERROR_ACCESS_DENIED: error = EACCES; break;
case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
case ERROR_SHARING_VIOLATION: error = EAGAIN; break;
case ERROR_ALREADY_EXISTS: error = EEXIST; break;
}
errno = error;
}
#endif /*__WINDOWS__*/
/*******************************
* OS STUFF *
*******************************/
/** int LastModifiedFile(const char *file, double *t)
Return the last modification time of file as a POSIX timestamp. Returns
(time_t)-1 on failure.
Contains a 64-bit value representing the number of 100-nanosecond
intervals since January 1, 1601 (UTC).
*/
int
LastModifiedFile(const char *name, double *tp)
{
#ifdef __WINDOWS__
HANDLE hFile;
wchar_t wfile[MAXPATHLEN];
#define nano * 0.000000001
#define ntick 100.0
#define SEC_TO_UNIX_EPOCH 11644473600.0
if ( !_xos_os_filenameW(name, wfile, MAXPATHLEN) )
return FALSE;
if ( (hFile=CreateFileW(wfile,
0,
FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL)) != INVALID_HANDLE_VALUE )
{ FILETIME wt;
int rc;
rc = GetFileTime(hFile, NULL, NULL, &wt);
CloseHandle(hFile);
if ( rc )
{ double t;
t = (double)wt.dwHighDateTime * (4294967296.0 * ntick nano);
t += (double)wt.dwLowDateTime * (ntick nano);
t -= SEC_TO_UNIX_EPOCH;
*tp = t;
return TRUE;
}
}
set_posix_error(GetLastError());
return FALSE;
#else
char tmp[MAXPATHLEN];
statstruct buf;
#ifdef __ANDROID__
if (strstr(name,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
*tp = (double)0;
if (!strcmp(name,"/assets"))
return TRUE;
const char *bufp=name+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir) {
const char *ptr = AAssetDir_getNextFileName(assetDir) ;
AAssetDir_close(assetDir);
if (ptr)
return TRUE;
}
AAsset *asset = AAssetManager_open(mgr, bufp, AASSET_MODE_UNKNOWN);
if (!asset)
return FALSE;
AAsset_close(asset);
return TRUE;
}
#endif
if ( statfunc(OsPath(name, tmp), &buf) < 0 )
return FALSE;
*tp = (double)buf.st_mtime;
return TRUE;
#endif
}
static int
LastModifiedFile64(const char *name, int64_t *tp)
{
#ifdef __WINDOWS__
HANDLE hFile;
wchar_t wfile[MAXPATHLEN];
#define nano * 0.000000001
#define ntick 100.0
#define SEC_TO_UNIX_EPOCH 11644473600.0
if ( !_xos_os_filenameW(name, wfile, MAXPATHLEN) )
return FALSE;
if ( (hFile=CreateFileW(wfile,
0,
FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL)) != INVALID_HANDLE_VALUE )
{ FILETIME wt;
int rc;
rc = GetFileTime(hFile, NULL, NULL, (FILETIME *)&wt);
CloseHandle(hFile);
if ( rc )
{
LARGE_INTEGER date, adjust;
date.HighPart = wt.dwHighDateTime;
date.LowPart = wt.dwLowDateTime;
adjust.QuadPart = 11644473600000 * 10000;
date.QuadPart -= adjust.QuadPart;
date.QuadPart /= 10000000;
*tp = date.QuadPart;
return TRUE;
}
}
set_posix_error(GetLastError());
return FALSE;
#else
char tmp[MAXPATHLEN];
statstruct buf;
#ifdef __ANDROID__
if (strstr(name,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
*tp = (int64_t)0;
if (!strcmp(name,"/assets"))
return TRUE;
const char *bufp=name+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir) {
const char *ptr = AAssetDir_getNextFileName(assetDir) ;
AAssetDir_close(assetDir);
if (ptr)
return TRUE;
}
AAsset *asset = AAssetManager_open(mgr, bufp, AASSET_MODE_UNKNOWN);
if (!asset)
return FALSE;
AAsset_close(asset);
return TRUE;
}
#endif
if ( statfunc(OsPath(name, tmp), &buf) < 0 )
return FALSE;
*tp = (int64_t)buf.st_mtime;
return TRUE;
#endif
}
/** static int64_t SizeFile(const char *path)
Return the size of the file path in bytes. Returns -1 if the file cannot
be accessed.
*/
static int64_t
SizeFile(const char *path)
{ char tmp[MAXPATHLEN];
statstruct buf;
#ifdef __ANDROID__
if (strstr(path,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
if (!strcmp(path,"/assets"))
return 0;
const char *bufp=path+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir) {
const char *ptr = AAssetDir_getNextFileName(assetDir) ;
AAssetDir_close(assetDir);
if (ptr)
return 0;
}
AAsset *asset = AAssetManager_open(mgr, bufp, AASSET_MODE_UNKNOWN);
if (!asset)
return -1;
AAsset_close(asset);
return 0;
}
#endif
if ( statfunc(OsPath(path, tmp), &buf) < 0 )
return -1;
return buf.st_size;
}
/** int AccessFile(const char *path, int mode)
TRUE if path can be accessed in the specified modes. Mode is a bitwise
or created from one or more of the constants ACCESS_EXIST, ACCESS_READ,
ACCESS_WRITE and ACCESS_EXECUTE.
*/
#ifndef F_OK
#define F_OK 0
#endif
int
AccessFile(const char *path, int mode)
{ char tmp[MAXPATHLEN];
#ifdef __ANDROID__
if (strstr(path,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
if (!strcmp(path,"/assets"))
return !(mode & ACCESS_WRITE );
const char *bufp=path+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir) {
const char *ptr = AAssetDir_getNextFileName(assetDir) ;
AAssetDir_close(assetDir);
if (ptr)
return !(mode & ACCESS_WRITE );
}
AAsset *asset = AAssetManager_open(mgr, bufp, AASSET_MODE_UNKNOWN);
if (!asset)
return FALSE;
AAsset_close(asset);
if ( mode == ACCESS_EXIST )
return TRUE;
else
{
if ( mode & ACCESS_WRITE ) return FALSE;
#ifdef X_OK
if ( mode & ACCESS_EXECUTE ) return FALSE;
#endif
return TRUE;
}
}
#endif
#ifdef HAVE_ACCESS
int m = 0;
if ( mode == ACCESS_EXIST )
m = F_OK;
else
{ if ( mode & ACCESS_READ ) m |= R_OK;
if ( mode & ACCESS_WRITE ) m |= W_OK;
#ifdef X_OK
if ( mode & ACCESS_EXECUTE ) m |= X_OK;
#endif
}
return access(OsPath(path, tmp), m) == 0 ? TRUE : FALSE;
#else
# error "No implementation for AccessFile()"
#endif
}
int
ExistsFile(const char *path)
{
#ifdef O_XOS
return _xos_exists(path, _XOS_FILE);
#else
char tmp[MAXPATHLEN];
statstruct buf;
#ifdef __ANDROID__
if (strstr(path,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
if (!strcmp(path,"/assets"))
return TRUE;
const char *bufp=path+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir) {
const char *ptr = AAssetDir_getNextFileName(assetDir) ;
AAssetDir_close(assetDir);
if (ptr)
return TRUE;
}
AAsset *asset = AAssetManager_open(mgr, bufp, AASSET_MODE_UNKNOWN);
if (!asset)
return FALSE;
AAsset_close(asset);
return TRUE;
}
#endif
if ( statfunc(OsPath(path, tmp), &buf) == -1 || !S_ISREG(buf.st_mode) )
{ DEBUG(2, perror(tmp));
return FALSE;
}
return TRUE;
#endif
}
int
ExistsDirectory(const char *path)
{
#ifdef O_XOS
return _xos_exists(path, _XOS_DIR);
#else
char tmp[MAXPATHLEN];
char *ospath = OsPath(path, tmp);
statstruct buf;
#ifdef __ANDROID__
if (strstr(ospath,"/assets")) {
AAssetManager* mgr = GLOBAL_assetManager;
const char *ptr = NULL;
if (!strcmp(path,"/assets"))
return TRUE;
const char *bufp=path+strlen("/assets/");
// check if file is a directory.
AAssetDir *assetDir = AAssetManager_openDir(mgr, bufp);
if (assetDir)
ptr = AAssetDir_getNextFileName(assetDir);
if (assetDir) {
AAssetDir_close(assetDir);
}
return ptr != NULL;
}
#endif
if ( statfunc(ospath, &buf) < 0 )
return FALSE;
if ( S_ISDIR(buf.st_mode) )
return TRUE;
return FALSE;
#endif /*O_XOS*/
}
static char *
ReadLink(const char *f, char *buf)
{
#ifdef HAVE_READLINK
int n;
if ( (n=readlink(f, buf, MAXPATHLEN-1)) > 0 )
{ buf[n] = EOS;
return buf;
}
#endif
return NULL;
}
static char *
DeRefLink1(const char *f, char *lbuf)
{ char buf[MAXPATHLEN];
char *l;
if ( (l=ReadLink(f, buf)) )
{ if ( l[0] == '/' ) /* absolute path */
{ strcpy(lbuf, buf);
return lbuf;
} else
{ char *q;
strcpy(lbuf, f);
q = &lbuf[strlen(lbuf)];
while(q>lbuf && q[-1] != '/')
q--;
strcpy(q, l);
canoniseFileName(lbuf);
return lbuf;
}
}
return NULL;
}
/** char *DeRefLink(const char *link, char *buf)
Dereference a symbolic link, returning its final destination. The
returned filename is canonical (i.e., references to ./ and ../ are
removed). Returns NULL if more than 20 links have been followed.
*/
char *
DeRefLink(const char *link, char *buf)
{ char tmp[MAXPATHLEN];
char *f;
int n = 20; /* avoid loop! */
while((f=DeRefLink1(link, tmp)) && n-- > 0)
link = f;
if ( n > 0 )
{ strcpy(buf, link);
return buf;
} else
return NULL;
}
static int
SameFile(const char *f1, const char *f2)
{ GET_LD
if ( truePrologFlag(PLFLAG_FILE_CASE) )
{ if ( streq(f1, f2) )
return TRUE;
} else
{ if ( strcasecmp(f1, f2) == 0 )
return TRUE;
}
#ifdef __unix__ /* doesn't work on most not Unix's */
{ statstruct buf1;
statstruct buf2;
char tmp[MAXPATHLEN];
if ( statfunc(OsPath(f1, tmp), &buf1) != 0 ||
statfunc(OsPath(f2, tmp), &buf2) != 0 )
return FALSE;
if ( buf1.st_ino == buf2.st_ino && buf1.st_dev == buf2.st_dev )
return TRUE;
}
#endif
#ifdef O_XOS
return _xos_same_file(f1, f2);
#endif /*O_XOS*/
/* Amazing! There is no simple way to check two files for identity. */
/* stat() and fstat() both return dummy values for inode and device. */
/* this is fine as OS'es not supporting symbolic links don't need this */
return FALSE;
}
/** int RemoveFile(const char *path)
Remove a file from the filesystem. Returns TRUE on success and FALSE
otherwise.
*/
int
RemoveFile(const char *path)
{ char tmp[MAXPATHLEN];
#ifdef HAVE_REMOVE
return remove(OsPath(path, tmp)) == 0 ? TRUE : FALSE;
#else
return unlink(OsPath(path, tmp)) == 0 ? TRUE : FALSE;
#endif
}
static int
RenameFile(const char *old, const char *new)
{ char oldbuf[MAXPATHLEN];
char newbuf[MAXPATHLEN];
char *osold, *osnew;
osold = OsPath(old, oldbuf);
osnew = OsPath(new, newbuf);
#ifdef HAVE_RENAME
return rename(osold, osnew) == 0 ? TRUE : FALSE;
#else
{ int rval;
unlink(osnew);
if ( (rval = link(osold, osnew)) == 0
&& (rval = unlink(osold)) != 0)
unlink(osnew);
if ( rval == 0 )
return TRUE;
return FALSE;
}
#endif /*HAVE_RENAME*/
}
static int
MarkExecutable(const char *name)
{
#if (defined(HAVE_STAT) && defined(HAVE_CHMOD)) || defined(__unix__)
statstruct buf;
mode_t um;
um = umask(0777);
umask(um);
if ( statfunc(name, &buf) == -1 )
{ GET_LD
term_t file = PL_new_term_ref();
PL_put_atom_chars(file, name);
return PL_error(NULL, 0, OsError(), ERR_FILE_OPERATION,
ATOM_stat, ATOM_file, file);
}
if ( (buf.st_mode & 0111) == (~um & 0111) )
return TRUE;
buf.st_mode |= 0111 & ~um;
if ( chmod(name, buf.st_mode) == -1 )
{ GET_LD
term_t file = PL_new_term_ref();
PL_put_atom_chars(file, name);
return PL_error(NULL, 0, OsError(), ERR_FILE_OPERATION,
ATOM_chmod, ATOM_file, file);
}
#endif /* defined(HAVE_STAT) && defined(HAVE_CHMOD) */
return TRUE;
}
/********************************
* FIND FILES FROM C *
*********************************/
int
unifyTime(term_t t, time_t time)
{ return PL_unify_time(t, time);
}
static int
add_option(term_t options, functor_t f, atom_t val)
{ GET_LD
term_t head;
if ( (head=PL_new_term_ref()) &&
PL_unify_list(options, head, options) &&
PL_unify_term(head, PL_FUNCTOR, f, PL_ATOM, val) )
{ PL_reset_term_refs(head);
return TRUE;
}
return FALSE;
}
#define CVT_FILENAME (CVT_ATOM|CVT_STRING|CVT_LIST)
static int
get_file_name(term_t n, char **namep, char *tmp, int flags)
{ GET_LD
char *name;
int chflags;
size_t len;
if ( flags & PL_FILE_SEARCH )
{ fid_t fid;
if ( (fid = PL_open_foreign_frame()) )
{ predicate_t pred = PL_predicate("absolute_file_name", 3, "system");
term_t av = PL_new_term_refs(3);
term_t options = PL_copy_term_ref(av+2);
int rc = TRUE;
int cflags = ((flags&PL_FILE_NOERRORS) ? PL_Q_CATCH_EXCEPTION
: PL_Q_PASS_EXCEPTION);
PL_put_term(av+0, n);
if ( rc && (flags & PL_FILE_EXIST) )
rc = add_option(options, FUNCTOR_access1, ATOM_exist);
if ( rc && (flags & PL_FILE_READ) )
rc = add_option(options, FUNCTOR_access1, ATOM_read);
if ( rc && (flags & PL_FILE_WRITE) )
rc = add_option(options, FUNCTOR_access1, ATOM_write);
if ( rc && (flags & PL_FILE_EXECUTE) )
rc = add_option(options, FUNCTOR_access1, ATOM_execute);
if ( rc ) rc = PL_unify_nil(options);
if ( rc ) rc = PL_call_predicate(NULL, cflags, pred, av);
if ( rc ) rc = PL_get_nchars(av+1, &len, namep,
CVT_ATOMIC|BUF_RING|REP_FN);
if ( rc && strlen(*namep) != len )
{ n = av+1;
goto code0;
}
PL_discard_foreign_frame(fid);
return rc;
}
return FALSE;
}
chflags = CVT_FILENAME;
if ( !(flags&(REP_UTF8|REP_MB)) )
chflags |= REP_FN;
if ( !(flags & PL_FILE_NOERRORS) )
chflags |= CVT_EXCEPTION;
if ( !PL_get_nchars(n, &len, &name, chflags) )
return FALSE;
if ( strlen(name) != len )
{ code0:
return PL_error(NULL, 0, "file name contains a 0-code",
ERR_DOMAIN, ATOM_file_name, n);
}
if ( len+1 >= MAXPATHLEN )
return PL_error(NULL, 0, NULL, ERR_REPRESENTATION,
ATOM_max_path_length);
if ( truePrologFlag(PLFLAG_FILEVARS) )
{ if ( !(name = expandVars(name, tmp, MAXPATHLEN)) )
return FALSE;
}
if ( !(flags & PL_FILE_NOERRORS) )
{ atom_t op = 0;
if ( (flags&(PL_FILE_READ|PL_FILE_WRITE|PL_FILE_EXECUTE|PL_FILE_EXIST)) &&
!AccessFile(name, ACCESS_EXIST) )
return PL_error(NULL, 0, NULL, ERR_EXISTENCE, ATOM_file, n);
if ( (flags&PL_FILE_READ) && !AccessFile(name, ACCESS_READ) )
op = ATOM_read;
if ( !op && (flags&PL_FILE_WRITE) && !AccessFile(name, ACCESS_WRITE) )
op = ATOM_write;
if ( !op && (flags&PL_FILE_EXECUTE) && !AccessFile(name, ACCESS_EXECUTE) )
op = ATOM_execute;
if ( op )
return PL_error(NULL, 0, NULL, ERR_PERMISSION, op, ATOM_file, n);
}
if ( flags & PL_FILE_ABSOLUTE )
{ if ( !(name = AbsoluteFile(name, tmp)) )
return FALSE;
}
*namep = buffer_string(name, BUF_RING);
return TRUE;
}
int
PL_get_file_name(term_t n, char **namep, int flags)
{ char buf[MAXPATHLEN];
char ospath[MAXPATHLEN];
char *name;
int rc;
if ( (rc=get_file_name(n, &name, buf, flags)) )
{ if ( (flags & PL_FILE_OSPATH) )
{ if ( !(name = OsPath(name, ospath)) )
return FALSE;
}
*namep = buffer_string(name, BUF_RING);
}
return rc;
}
int
PL_get_file_nameW(term_t n, wchar_t **namep, int flags)
{ char buf[MAXPATHLEN];
char ospath[MAXPATHLEN];
char *name;
int rc;
if ( (rc=get_file_name(n, &name, buf, flags|REP_UTF8)) )
{ Buffer b;
const char *s;
if ( (flags & PL_FILE_OSPATH) )
{ if ( !(name = OsPath(name, ospath)) )
return FALSE;
}
b = findBuffer(BUF_RING);
for(s = name; *s; )
{ int chr;
s = utf8_get_char(s, &chr);
addBuffer(b, (wchar_t)chr, wchar_t);
}
addBuffer(b, (wchar_t)0, wchar_t);
*namep = baseBuffer(b, wchar_t);
}
return rc;
}
/*******************************
* QUERY FILES *
*******************************/
static
PRED_IMPL("time_file", 2, time_file, 0)
{ char *fn;
if ( PL_get_file_name(A1, &fn, 0) )
{ double time;
if ( LastModifiedFile(fn, &time) )
return PL_unify_float(A2, time);
return PL_error(NULL, 0, NULL, ERR_FILE_OPERATION,
ATOM_time, ATOM_file, A1);
}
return FALSE;
}
static
PRED_IMPL("time_file64", 2, time_file64, 0)
{ GET_LD
char *fn;
if ( PL_get_file_name(A1, &fn, 0) )
{ int64_t time;
if ( LastModifiedFile64(fn, &time) )
return PL_unify_int64(A2, time);
return PL_error(NULL, 0, NULL, ERR_FILE_OPERATION,
ATOM_time, ATOM_file, A1);
}
return FALSE;
}
static
PRED_IMPL("size_file", 2, size_file, 0)
{ PRED_LD
char *n;
if ( PL_get_file_name(A1, &n, 0) )
{ int64_t size;
if ( (size = SizeFile(n)) < 0 )
return PL_error("size_file", 2, OsError(), ERR_FILE_OPERATION,
ATOM_size, ATOM_file, A1);
return PL_unify_int64(A2, size);
}
return FALSE;
}
static
PRED_IMPL("access_file", 2, access_file, 0)
/** @pred access_file(+ _F_,+ _M_)
Is the file accessible?
*/
{ PRED_LD
char *n;
int md;
atom_t m;
term_t name = A1;
term_t mode = A2;
if ( !PL_get_atom(mode, &m) )
return PL_error("access_file", 2, NULL, ERR_TYPE, ATOM_atom, mode);
if ( !PL_get_file_name(name, &n, 0) )
return FALSE;
if ( m == ATOM_none )
return TRUE;
if ( m == ATOM_write || m == ATOM_append )
md = ACCESS_WRITE;
else if ( m == ATOM_read )
md = ACCESS_READ;
else if ( m == ATOM_execute )
md = ACCESS_EXECUTE;
else if ( m == ATOM_exist )
md = ACCESS_EXIST;
else
return PL_error("access_file", 2, NULL, ERR_DOMAIN, ATOM_io_mode, mode);
if ( AccessFile(n, md) )
return TRUE;
if ( md == ACCESS_WRITE && !AccessFile(n, ACCESS_EXIST) )
{ char tmp[MAXPATHLEN];
char *dir = DirName(n, tmp);
if ( dir[0] )
{ if ( !ExistsDirectory(dir) )
return FALSE;
}
if ( AccessFile(dir[0] ? dir : ".", md) )
return TRUE;
}
return FALSE;
}
static
PRED_IMPL("read_link", 3, read_link, 0)
{ char *n, *l, *t;
char buf[MAXPATHLEN];
term_t file = A1;
term_t link = A2;
term_t to = A3;
if ( !PL_get_file_name(file, &n, 0) )
return FALSE;
if ( (l = ReadLink(n, buf)) &&
PL_unify_atom_chars(link, l) &&
(t = DeRefLink(n, buf)) &&
PL_unify_atom_chars(to, t) )
return TRUE;
return FALSE;
}
static
PRED_IMPL("exists_file", 1, exists_file, 0)
{ char *n;
if ( !PL_get_file_name(A1, &n, 0) )
return FALSE;
return ExistsFile(n);
}
static
PRED_IMPL("exists_directory", 1, exists_directory, 0)
{ char *n;
if ( !PL_get_file_name(A1, &n, 0) )
return FALSE;
return ExistsDirectory(n);
}
static
PRED_IMPL("is_absolute_file_name", 1, is_absolute_file_name, 0)
{ char *n;
if ( PL_get_file_name(A1, &n, 0) &&
IsAbsolutePath(n) )
return TRUE;
return FALSE;
}
static
PRED_IMPL("same_file", 2, same_file, 0)
{ char *n1, *n2;
if ( PL_get_file_name(A1, &n1, 0) &&
PL_get_file_name(A2, &n2, 0) )
return SameFile(n1, n2);
return FALSE;
}
/** @pred file_base_name(+ _Name_,- _FileName_)
Give the path a full path _FullPath_ extract the _FileName_.
*/
static
PRED_IMPL("file_base_name", 2, file_base_name, 0)
{ char *n;
if ( !PL_get_chars(A1, &n, CVT_ALL|REP_FN|CVT_EXCEPTION) )
return FALSE;
return PL_unify_chars(A2, PL_ATOM|REP_FN, -1, BaseName(n));
}
static
PRED_IMPL("file_directory_name", 2, file_directory_name, 0)
{ char *n;
char tmp[MAXPATHLEN];
if ( !PL_get_chars(A1, &n, CVT_ALL|REP_FN|CVT_EXCEPTION) )
return FALSE;
return PL_unify_chars(A2, PL_ATOM|REP_FN, -1, DirName(n, tmp));
}
/*******************************
* TEMPORARY FILES *
*******************************/
static
PRED_IMPL("tmp_file", 2, tmp_file, 0)
{ PRED_LD
char *n;
term_t base = A1;
term_t name = A2;
if ( !PL_get_chars(base, &n, CVT_ALL) )
return PL_error("tmp_file", 2, NULL, ERR_TYPE, ATOM_atom, base);
return PL_unify_atom(name, TemporaryFile(n, NULL));
}
/** tmp_file_stream(+Mode, -File, -Stream)
*/
static
PRED_IMPL("tmp_file_stream", 3, tmp_file_stream, 0)
{ PRED_LD
atom_t fn;
int fd;
IOENC enc;
atom_t encoding;
const char *mode;
if ( !PL_get_atom_ex(A1, &encoding) )
return FALSE;
if ( (enc = atom_to_encoding(encoding)) == ENC_UNKNOWN )
{ if ( encoding == ATOM_binary )
{ enc = ENC_OCTET;
mode = "wb";
} else
{ return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_encoding, A1);
}
} else
{ mode = "w";
}
if ( (fn=TemporaryFile("", &fd)) )
{ IOSTREAM *s;
if ( !PL_unify_atom(A2, fn) )
{ close(fd);
return PL_error(NULL, 0, NULL, ERR_UNINSTANTIATION, 2, A2);
}
s = Sfdopen(fd, mode);
s->encoding = enc;
return PL_unify_stream(A3, s);
} else
{ return PL_error(NULL, 0, NULL, ERR_RESOURCE, ATOM_temporary_files);
}
}
/*******************************
* CHANGE FILESYSTEM *
*******************************/
static
PRED_IMPL("$swi_delete_file", 1, delete_file, 0)
{ PRED_LD
char *n;
atom_t aname;
if ( PL_get_atom(A1, &aname) &&
DeleteTemporaryFile(aname) )
return TRUE;
if ( !PL_get_file_name(A1, &n, 0) )
return FALSE;
if ( RemoveFile(n) )
return TRUE;
return PL_error(NULL, 0, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_delete, ATOM_file, A1);
}
static
PRED_IMPL("delete_directory", 1, delete_directory, 0)
{ char *n;
if ( !PL_get_file_name(A1, &n, 0) )
return FALSE;
if ( rmdir(n) == 0 )
return TRUE;
else
return PL_error(NULL, 0, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_delete, ATOM_directory, A1);
}
static
PRED_IMPL("make_directory", 1, make_directory, 0)
{ char *n;
if ( !PL_get_file_name(A1, &n, 0) )
return FALSE;
if ( mkdir(n, 0777) == 0 )
return TRUE;
else
return PL_error(NULL, 0, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_create, ATOM_directory, A1);
}
static
PRED_IMPL("rename_file", 2, rename_file, 0)
{ PRED_LD
char *o, *n;
term_t old = A1;
term_t new = A2;
if ( PL_get_file_name(old, &o, 0) &&
PL_get_file_name(new, &n, 0) )
{ if ( SameFile(o, n) )
{ if ( truePrologFlag(PLFLAG_FILEERRORS) )
return PL_error("rename_file", 2, "same file", ERR_PERMISSION,
ATOM_rename, ATOM_file, old);
return FALSE;
}
if ( RenameFile(o, n) )
return TRUE;
if ( truePrologFlag(PLFLAG_FILEERRORS) )
return PL_error("rename_file", 2, OsError(), ERR_FILE_OPERATION,
ATOM_rename, ATOM_file, old);
return FALSE;
}
return FALSE;
}
static
PRED_IMPL("$absolute_file_name", 2, absolute_file_name, 0)
{ char *n;
char tmp[MAXPATHLEN];
term_t name = A1;
term_t expanded = A2;
if ( PL_get_file_name(name, &n, 0) &&
(n = AbsoluteFile(n, tmp)) )
return PL_unify_chars(expanded, PL_ATOM|REP_FN, -1, n);
return FALSE;
}
static
PRED_IMPL("working_directory", 2, working_directory, 0)
{ PRED_LD
char buf[MAXPATHLEN];
const char *wd;
term_t old = A1;
term_t new = A2;
if ( !(wd = PL_cwd(buf, sizeof(buf))) )
return FALSE;
if ( PL_unify_chars(old, PL_ATOM|REP_FN, -1, wd) )
{ if ( PL_compare(old, new) != 0 )
{ char *n;
if ( PL_get_file_name(new, &n, 0) )
{
if ( ChDir(n) )
return TRUE;
if ( truePrologFlag(PLFLAG_FILEERRORS) )
return PL_error(NULL, 0, NULL, ERR_FILE_OPERATION,
ATOM_chdir, ATOM_directory, new);
}
return FALSE;
}
return TRUE;
}
return FALSE;
}
static int
has_extension(const char *name, const char *ext)
{ GET_LD
const char *s = name + strlen(name);
if ( ext[0] == EOS )
return TRUE;
while(*s != '.' && *s != '/' && s > name)
s--;
if ( *s == '.' && s > name && s[-1] != '/' )
{ if ( ext[0] == '.' )
ext++;
if ( truePrologFlag(PLFLAG_FILE_CASE) )
return strcmp(&s[1], ext) == 0;
else
return strcasecmp(&s[1], ext) == 0;
}
return FALSE;
}
static int
name_too_long(void)
{ return PL_error(NULL, 0, NULL, ERR_REPRESENTATION, ATOM_max_path_length);
}
/** @pred file_name_extension(? _Base_,? _Extension_, ? _Name_)
This predicate is used to add, remove or test filename extensions. The
main reason for its introduction is to deal with different filename
properties in a portable manner. If the file system is
case-insensitive, testing for an extension will be done
case-insensitive too. _Extension_ may be specified with or
without a leading dot (.). If an _Extension_ is generated, it
will not have a leading dot.
*/
static
PRED_IMPL("file_name_extension", 3, file_name_extension, 0)
{ PRED_LD
char *b = NULL, *e = NULL, *f;
char buf[MAXPATHLEN];
term_t base = A1;
term_t ext = A2;
term_t full = A3;
if ( !PL_is_variable(full) )
{ if ( PL_get_chars(full, &f, CVT_ALL|CVT_EXCEPTION|REP_FN) )
{ char *s = f + strlen(f); /* ?base, ?ext, +full */
while(*s != '.' && *s != '/' && s > f)
s--;
if ( *s == '.' )
{ if ( PL_get_chars(ext, &e, CVT_ALL|REP_FN) )
{ if ( e[0] == '.' )
e++;
if ( truePrologFlag(PLFLAG_FILE_CASE) )
{ TRY(strcmp(&s[1], e) == 0);
} else
{ TRY(strcasecmp(&s[1], e) == 0);
}
} else
{ TRY(PL_unify_chars(ext, PL_ATOM|REP_FN, -1, &s[1]));
}
return PL_unify_chars(base, PL_ATOM|REP_FN, s-f, f);
}
if ( PL_unify_atom_chars(ext, "") &&
PL_unify(full, base) )
PL_succeed;
}
PL_fail;
}
if ( PL_get_chars(base, &b, CVT_ALL|BUF_RING|REP_FN|CVT_EXCEPTION) &&
PL_get_chars(ext, &e, CVT_ALL|REP_FN|CVT_EXCEPTION) )
{ char *s;
if ( e[0] == '.' ) /* +Base, +Extension, -full */
e++;
if ( has_extension(b, e) )
return PL_unify(base, full);
if ( strlen(b) + 1 + strlen(e) + 1 > MAXPATHLEN )
return name_too_long();
strcpy(buf, b);
s = buf + strlen(buf);
*s++ = '.';
strcpy(s, e);
return PL_unify_chars(full, PL_ATOM|REP_FN, -1, buf);
} else
return FALSE;
}
/** @pred prolog_to_os_filename(+ _PrologPath_,- _OsPath_)
This is an SWI-Prolog built-in. Converts between the internal Prolog
pathname conventions and the operating-system pathname conventions. The
internal conventions are Unix and this predicates is equivalent to =/2
(unify) on Unix systems. On DOS systems it will change the
directory-separator, limit the filename length map dots, except for the
last one, onto underscores.
*/
static
PRED_IMPL("prolog_to_os_filename", 2, prolog_to_os_filename, 0)
{ PRED_LD
term_t pl = A1;
term_t os = A2;
#ifdef O_XOS
wchar_t *wn;
if ( !PL_is_variable(pl) )
{ char *n;
wchar_t buf[MAXPATHLEN];
if ( PL_get_chars(pl, &n, CVT_ALL|REP_UTF8|CVT_EXCEPTION) )
{ if ( !_xos_os_filenameW(n, buf, MAXPATHLEN) )
return name_too_long();
return PL_unify_wchars(os, PL_ATOM, -1, buf);
}
return FALSE;
}
if ( PL_get_wchars(os, NULL, &wn, CVT_ALL) )
{ wchar_t lbuf[MAXPATHLEN];
char buf[MAXPATHLEN];
_xos_long_file_nameW(wn, lbuf, MAXPATHLEN);
_xos_canonical_filenameW(lbuf, buf, MAXPATHLEN, 0);
return PL_unify_chars(pl, PL_ATOM|REP_UTF8, -1, buf);
}
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_atom, pl);
#else /*O_XOS*/
return PL_unify(pl, os);
#endif /*O_XOS*/
}
static
PRED_IMPL("mark_executable", 1, mark_executable, 0)
{ char *name;
if ( !PL_get_file_name(A1, &name, 0) )
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_source_sink, A1);
return MarkExecutable(name);
}
/*******************************
* INIT *
*******************************/
void
initFiles(void)
{
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(files)
PRED_DEF("working_directory", 2, working_directory, 0)
PRED_DEF("access_file", 2, access_file, 0)
PRED_DEF("time_file", 2, time_file, 0)
PRED_DEF("time_file64", 2, time_file64, 0)
PRED_DEF("size_file", 2, size_file, 0)
PRED_DEF("read_link", 3, read_link, 0)
PRED_DEF("exists_file", 1, exists_file, 0)
PRED_DEF("exists_directory", 1, exists_directory, 0)
PRED_DEF("tmp_file", 2, tmp_file, 0)
PRED_DEF("tmp_file_stream", 3, tmp_file_stream, 0)
PRED_DEF("$swi_delete_file", 1, delete_file, 0)
PRED_DEF("delete_directory", 1, delete_directory, 0)
PRED_DEF("make_directory", 1, make_directory, 0)
PRED_DEF("same_file", 2, same_file, 0)
PRED_DEF("rename_file", 2, rename_file, 0)
PRED_DEF("is_absolute_file_name", 1, is_absolute_file_name, 0)
PRED_DEF("file_base_name", 2, file_base_name, 0)
PRED_DEF("file_directory_name", 2, file_directory_name, 0)
PRED_DEF("file_name_extension", 3, file_name_extension, 0)
PRED_DEF("prolog_to_os_filename", 2, prolog_to_os_filename, 0)
PRED_DEF("$mark_executable", 1, mark_executable, 0)
PRED_DEF("$absolute_file_name", 2, absolute_file_name, 0)
EndPredDefs
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