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/*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// Contains code handling files
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "port.h"
#include "libs/uio.h"
#include "config.h"
#include "types.h"
#include "filintrn.h"
#include "libs/memlib.h"
#include "libs/log.h"
static int copyError(uio_Handle *srcHandle, uio_Handle *dstHandle,
uio_DirHandle *unlinkHandle, const char *unlinkPath, uint8 *buf);
bool
fileExists (const char *name)
{
return access (name, F_OK) == 0;
}
bool
fileExists2(uio_DirHandle *dir, const char *fileName)
{
uio_Stream *stream;
stream = uio_fopen (dir, fileName, "rb");
if (stream == NULL)
return 0;
uio_fclose (stream);
return 1;
}
/*
* Copy a file with path srcName to a file with name newName.
* If the destination already exists, the operation fails.
* Links are followed.
* Special files (fifos, char devices, block devices, etc) will be
* read as long as there is data available and the destination will be
* a regular file with that data.
* The new file will have the same permissions as the old.
* If an error occurs during copying, an attempt will be made to
* remove the copy.
*/
int
copyFile (uio_DirHandle *srcDir, const char *srcName,
uio_DirHandle *dstDir, const char *newName)
{
uio_Handle *src, *dst;
struct stat sb;
#define BUFSIZE 65536
uint8 *buf, *bufPtr;
ssize_t numInBuf, numWritten;
src = uio_open (srcDir, srcName, O_RDONLY
#ifdef WIN32
| O_BINARY
#endif
, 0);
if (src == NULL)
return -1;
if (uio_fstat (src, &sb) == -1)
return copyError (src, NULL, NULL, NULL, NULL);
dst = uio_open (dstDir, newName, O_WRONLY | O_CREAT | O_EXCL
#ifdef WIN32
| O_BINARY
#endif
, sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
if (dst == NULL)
return copyError (src, NULL, NULL, NULL, NULL);
buf = HMalloc(BUFSIZE);
// This was originally a statically allocated buffer,
// but as this function might be run from a thread with
// a small stack, this is better.
while (1)
{
numInBuf = uio_read (src, buf, BUFSIZE);
if (numInBuf == -1)
{
if (errno == EINTR)
continue;
return copyError (src, dst, dstDir, newName, buf);
}
if (numInBuf == 0)
break;
bufPtr = buf;
do
{
numWritten = uio_write (dst, bufPtr, numInBuf);
if (numWritten == -1)
{
if (errno == EINTR)
continue;
return copyError (src, dst, dstDir, newName, buf);
}
numInBuf -= numWritten;
bufPtr += numWritten;
} while (numInBuf > 0);
}
HFree (buf);
uio_close (src);
uio_close (dst);
errno = 0;
return 0;
}
/*
* Closes srcHandle if it's not -1.
* Closes dstHandle if it's not -1.
* Removes unlinkpath from the unlinkHandle dir if it's not NULL.
* Frees 'buf' if not NULL.
* Always returns -1.
* errno is what was before the call.
*/
static int
copyError(uio_Handle *srcHandle, uio_Handle *dstHandle,
uio_DirHandle *unlinkHandle, const char *unlinkPath, uint8 *buf)
{
int savedErrno;
savedErrno = errno;
log_add (log_Debug, "Error while copying: %s", strerror (errno));
if (srcHandle != NULL)
uio_close (srcHandle);
if (dstHandle != NULL)
uio_close (dstHandle);
if (unlinkPath != NULL)
uio_unlink (unlinkHandle, unlinkPath);
if (buf != NULL)
HFree(buf);
errno = savedErrno;
return -1;
}
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