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