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file-ops.cc
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1997-08-20
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/*
Copyright (C) 1996 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Modified by Klaus Gebhardt, 1996 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#ifdef HAVE_UNISTD_H
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <unistd.h>
#endif
#ifdef __EMX__
#include <mkfifo.h>
#endif
#include "file-ops.h"
#include "lo-error.h"
#include "statdefs.h"
// These must come after <sys/types.h> and <sys/stat.h>.
#include <safe-lstat.h>
#include <safe-stat.h>
// XXX FIXME XXX -- the is_* and mode_as_string functions are only valid
// for initialized objects. If called for an object that is not
// initialized, they should throw an exception.
bool
file_stat::is_blk (void) const
{
#ifdef S_ISBLK
return S_ISBLK (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_chr (void) const
{
#ifdef S_ISCHR
return S_ISCHR (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_dir (void) const
{
#ifdef S_ISDIR
return S_ISDIR (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_fifo (void) const
{
#ifdef S_ISFIFO
return S_ISFIFO (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_lnk (void) const
{
#ifdef S_ISLNK
return S_ISLNK (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_reg (void) const
{
#ifdef S_ISREG
return S_ISREG (fs_mode);
#else
return false;
#endif
}
bool
file_stat::is_sock (void) const
{
#ifdef S_ISSOCK
return S_ISSOCK (fs_mode);
#else
return false;
#endif
}
extern "C" void mode_string ();
string
file_stat::mode_as_string (void) const
{
char buf[11];
mode_string (fs_mode, buf);
buf[10] = '\0';
return string (buf);
}
// Private stuff:
void
file_stat::update_internal (bool force)
{
if (! initialized || force)
{
initialized = false;
fail = false;
const char *cname = file_name.c_str ();
struct stat buf;
int status = follow_links
? SAFE_STAT (cname, &buf) : SAFE_LSTAT (cname, &buf);
if (status < 0)
{
fail = true;
errmsg = strerror (errno);
}
else
{
fs_mode = buf.st_mode;
fs_ino = buf.st_ino;
fs_dev = buf.st_dev;
fs_nlink = buf.st_nlink;
fs_uid = buf.st_uid;
fs_gid = buf.st_gid;
fs_size = buf.st_size;
fs_atime = buf.st_atime;
fs_mtime = buf.st_mtime;
fs_ctime = buf.st_ctime;
#if defined (HAVE_ST_RDEV)
fs_rdev = buf.st_rdev;
#endif
#if defined (HAVE_ST_BLKSIZE)
fs_blksize = buf.st_blksize;
#endif
#if defined (HAVE_ST_BLOCKS)
fs_blocks = buf.st_blocks;
#endif
}
initialized = true;
}
}
void
file_stat::copy (const file_stat& fs)
{
file_name = fs.file_name;
follow_links = fs.follow_links;
initialized = fs.initialized;
fail = fs.fail;
errmsg = fs.errmsg;
fs_mode = fs.fs_mode;
fs_ino = fs.fs_ino;
fs_dev = fs.fs_dev;
fs_nlink = fs.fs_nlink;
fs_uid = fs.fs_uid;
fs_gid = fs.fs_gid;
fs_size = fs.fs_size;
fs_atime = fs.fs_atime;
fs_mtime = fs.fs_mtime;
fs_ctime = fs.fs_ctime;
#if defined (HAVE_ST_RDEV)
fs_rdev = fs.fs_rdev;
#endif
#if defined (HAVE_ST_BLKSIZE)
fs_blksize = fs.fs_blksize;
#endif
#if defined (HAVE_ST_BLOCKS)
fs_blocks = fs.fs_blocks;
#endif
}
// Functions for octave.
// Has FILE been modified since TIME? Returns 1 for yes, 0 for no,
// and -1 for any error.
int
is_newer (const string& file, time_t time)
{
file_stat fs (file);
return fs ? fs.is_newer (time) : -1;
}
// We provide a replacement for mkdir().
int
oct_mkdir (const string& name, mode_t mode)
{
return mkdir (name.c_str (), mode);
}
int
oct_mkdir (const string& name, mode_t mode, string& msg)
{
msg = string ();
int status = mkdir (name.c_str (), mode);
if (status < 0)
msg = strerror (errno);
return status;
}
// I don't know how to emulate this on systems that don't provide it.
int
oct_mkfifo (const string& name, mode_t mode)
{
string msg;
return oct_mkfifo (name, mode, msg);
}
int
oct_mkfifo (const string& name, mode_t mode, string& msg)
{
msg = string ();
#if defined (HAVE_MKFIFO)
int status = mkfifo (name.c_str (), mode);
if (status < 0)
msg = strerror (errno);
return status;
#else
msg = "mkfifo: not implemented on this system";
return -1;
#endif
}
// We provide a replacement for rename().
int
oct_rename (const string& from, const string& to)
{
return rename (from.c_str (), to.c_str ());
}
int
oct_rename (const string& from, const string& to, string& msg)
{
msg = string ();
int status = rename (from.c_str (), to.c_str ());
if (status < 0)
msg = strerror (errno);
return status;
}
// We provide a replacement for rmdir().
int
oct_rmdir (const string& name)
{
return rmdir (name.c_str ());
}
int
oct_rmdir (const string& name, string& msg)
{
msg = string ();
int status = rmdir (name.c_str ());
if (status < 0)
msg = strerror (errno);
return status;
}
// We provide a replacement for tempnam().
string
oct_tempnam (void)
{
string retval;
char *tmp = tempnam (0, "oct-");
if (tmp)
{
retval = tmp;
free (tmp);
}
else
(*current_liboctave_error_handler) ("can't open temporary file!");
return retval;
}
int
oct_umask (mode_t mode)
{
#if defined (HAVE_UMASK)
return umask (mode);
#else
return 0;
#endif
}
int
oct_unlink (const string& name)
{
return unlink (name.c_str ());
}
int
oct_unlink (const string& name, string& errmsg)
{
errmsg = string ();
int status = unlink (name.c_str ());
if (status < 0)
errmsg = strerror (errno);
return status;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/