19990502 sourceware importbinu_ss_19990502

1 files changed, 210 insertions, 0 deletions

diff --git a/binutils/rename.c b/binutils/rename.c
new file mode 100644
index 0000000..fdc7263
--- /dev/null
+++ b/binutils/rename.c
@@ -0,0 +1,210 @@
+/* rename.c -- rename a file, preserving symlinks.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+   This file is part of GNU Binutils.
+
+   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.  */
+
+#include "bfd.h"
+#include "bucomm.h"
+
+#include <sys/stat.h>
+
+#ifdef HAVE_GOOD_UTIME_H
+#include <utime.h>
+#else /* ! HAVE_GOOD_UTIME_H */
+#ifdef HAVE_UTIMES
+#include <sys/time.h>
+#endif /* HAVE_UTIMES */
+#endif /* ! HAVE_GOOD_UTIME_H */
+
+static int simple_copy PARAMS ((const char *, const char *));
+
+/* The number of bytes to copy at once.  */
+#define COPY_BUF 8192
+
+/* Copy file FROM to file TO, performing no translations.
+   Return 0 if ok, -1 if error.  */
+
+static int
+simple_copy (from, to)
+     const char *from;
+     const char *to;
+{
+  int fromfd, tofd, nread;
+  int saved;
+  char buf[COPY_BUF];
+
+  fromfd = open (from, O_RDONLY);
+  if (fromfd < 0)
+    return -1;
+  tofd = creat (to, 0777);
+  if (tofd < 0)
+    {
+      saved = errno;
+      close (fromfd);
+      errno = saved;
+      return -1;
+    }
+  while ((nread = read (fromfd, buf, sizeof buf)) > 0)
+    {
+      if (write (tofd, buf, nread) != nread)
+	{
+	  saved = errno;
+	  close (fromfd);
+	  close (tofd);
+	  errno = saved;
+	  return -1;
+	}
+    }
+  saved = errno;
+  close (fromfd);
+  close (tofd);
+  if (nread < 0)
+    {
+      errno = saved;
+      return -1;
+    }
+  return 0;
+}
+
+/* Set the times of the file DESTINATION to be the same as those in
+   STATBUF.  */
+
+void
+set_times (destination, statbuf)
+     const char *destination;
+     const struct stat *statbuf;
+{
+  int result;
+
+  {
+#ifdef HAVE_GOOD_UTIME_H
+    struct utimbuf tb;
+
+    tb.actime = statbuf->st_atime;
+    tb.modtime = statbuf->st_mtime;
+    result = utime (destination, &tb);
+#else /* ! HAVE_GOOD_UTIME_H */
+#ifndef HAVE_UTIMES
+    long tb[2];
+
+    tb[0] = statbuf->st_atime;
+    tb[1] = statbuf->st_mtime;
+    result = utime (destination, tb);
+#else /* HAVE_UTIMES */
+    struct timeval tv[2];
+
+    tv[0].tv_sec = statbuf->st_atime;
+    tv[0].tv_usec = 0;
+    tv[1].tv_sec = statbuf->st_mtime;
+    tv[1].tv_usec = 0;
+    result = utimes (destination, tv);
+#endif /* HAVE_UTIMES */
+#endif /* ! HAVE_GOOD_UTIME_H */
+  }
+
+  if (result != 0)
+    non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
+}
+
+#ifndef S_ISLNK
+#ifdef S_IFLNK
+#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+#else
+#define S_ISLNK(m) 0
+#define lstat stat
+#endif
+#endif
+
+/* Rename FROM to TO, copying if TO is a link.
+   Return 0 if ok, -1 if error.  */
+
+int
+smart_rename (from, to, preserve_dates)
+     const char *from;
+     const char *to;
+     int preserve_dates;
+{
+  int exists;
+  struct stat s;
+  int ret = 0;
+
+  exists = lstat (to, &s);
+
+#if defined (_WIN32) && !defined (__CYGWIN32__)
+  /* Win32, unlike unix, will not erase `to' in `rename(from, to)' but
+     fail instead.  Also, chown is not present.  */
+
+  if (exists == 0)
+    remove (to);
+
+  ret = rename (from, to);
+  if (ret != 0)
+    {
+      /* We have to clean up here. */
+      
+      non_fatal (_("%s: rename: %s"), to, strerror (errno));
+      unlink (from);
+    }
+#else
+  /* Use rename only if TO is not a symbolic link and has
+     only one hard link.  */
+  if (exists < 0 || (!S_ISLNK (s.st_mode) && s.st_nlink == 1))
+    {
+      ret = rename (from, to);
+      if (ret == 0)
+	{
+	  if (exists)
+	    {
+	      /* Try to preserve the permission bits and ownership of
+		 TO.  First get the mode right except for the setuid
+		 bit.  Then change the ownership.  Then fix the setuid
+		 bit.  We do the chmod before the chown because if the
+		 chown succeeds, and we are a normal user, we won't be
+		 able to do the chmod afterward.  We don't bother to
+		 fix the setuid bit first because that might introduce
+		 a fleeting security problem, and because the chown
+		 will clear the setuid bit anyhow.  We only fix the
+		 setuid bit if the chown succeeds, because we don't
+		 want to introduce an unexpected setuid file owned by
+		 the user running objcopy.  */
+	      chmod (to, s.st_mode & 0777);
+	      if (chown (to, s.st_uid, s.st_gid) >= 0)
+		chmod (to, s.st_mode & 07777);
+	    }
+	}
+      else
+	{
+	  /* We have to clean up here. */
+	  non_fatal (_("%s: rename: %s"), to, strerror (errno));
+	  unlink (from);
+	}
+    }
+  else
+    {
+      ret = simple_copy (from, to);
+      if (ret != 0)
+	non_fatal (_("%s: simple_copy: %s"), to, strerror (errno));
+
+      if (preserve_dates)
+	set_times (to, &s);
+      unlink (from);
+    }
+#endif /* _WIN32 && !__CYGWIN32__ */
+
+  return ret;
+}