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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# include <sys/file.h>
#endif
#include <errno.h>
# ifndef errno
extern int errno;
#endif
#include "save-cwd.h"
#include "error.h"
char *xgetcwd __P((void));
/* Record the location of the current working directory in CWD so that
the program may change to other directories and later use restore_cwd
to return to the recorded location. This function may allocate
space using malloc (via xgetcwd) or leave a file descriptor open;
use free_cwd to perform the necessary free or close. Upon failure,
no memory is allocated, any locally opened file descriptors are
closed; return non-zero -- in that case, free_cwd need not be
called, but doing so is ok. Otherwise, return zero. */
int
save_cwd (cwd)
struct saved_cwd *cwd;
{
static int have_working_fchdir = 1;
cwd->desc = -1;
cwd->name = NULL;
if (have_working_fchdir)
{
#ifdef HAVE_FCHDIR
cwd->desc = open (".", O_RDONLY);
if (cwd->desc < 0)
{
error (0, errno, "cannot open current directory");
return 1;
}
# if __sun__ || sun
/* On SunOS 4, fchdir returns EINVAL if accounting is enabled,
so we have to fall back to chdir. */
if (fchdir (cwd->desc))
{
if (errno == EINVAL)
{
close (cwd->desc);
cwd->desc = -1;
have_working_fchdir = 0;
}
else
{
error (0, errno, "current directory");
close (cwd->desc);
cwd->desc = -1;
return 1;
}
}
# endif /* __sun__ || sun */
#else
#define fchdir(x) (abort (), 0)
have_working_fchdir = 0;
#endif
}
if (!have_working_fchdir)
{
cwd->name = xgetcwd ();
if (cwd->name == NULL)
{
error (0, errno, "cannot get current directory");
return 1;
}
}
return 0;
}
/* Change to recorded location, CWD, in directory hierarchy.
If "saved working directory", NULL))
*/
int
restore_cwd (cwd, dest, from)
const struct saved_cwd *cwd;
const char *dest;
const char *from;
{
int fail = 0;
if (cwd->desc >= 0)
{
if (fchdir (cwd->desc))
{
error (0, errno, "cannot return to %s%s%s",
(dest ? dest : "saved working directory"),
(from ? " from " : ""),
(from ? from : ""));
fail = 1;
}
}
else if (chdir (cwd->name) < 0)
{
error (0, errno, "%s", cwd->name);
fail = 1;
}
return fail;
}
void
free_cwd (cwd)
struct saved_cwd *cwd;
{
if (cwd->desc >= 0)
close (cwd->desc);
if (cwd->name)
free (cwd->name);
}
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