Virgin import (trimmed) of GNU Tar version 1.13.25.

1 files changed, 67 insertions, 0 deletions

diff --git a/contrib/tar/lib/full-write.c b/contrib/tar/lib/full-write.c
new file mode 100644
index 0000000..4e566f6
--- /dev/null
+++ b/contrib/tar/lib/full-write.c
@@ -0,0 +1,67 @@
+/* full-write.c -- an interface to write that retries after interrupts
+
+   Copyright 1993, 1994, 1997, 1998, 1999, 2000, 2001 Free Software
+   Foundation, Inc.
+
+   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, 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.
+
+   Written by Paul Eggert.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#include "full-write.h"
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted
+   or if partial writes occur.  Return the number of bytes successfully
+   written, setting errno if that is less than LEN.  */
+
+size_t
+full_write (int desc, const char *ptr, size_t len)
+{
+  size_t total_written = 0;
+
+  while (len > 0)
+    {
+      ssize_t written = write (desc, ptr, len);
+      if (written <= 0)
+	{
+	  /* Some buggy drivers return 0 when you fall off a device's end.  */
+	  if (written == 0)
+	    errno = ENOSPC;
+#ifdef EINTR
+	  if (errno == EINTR)
+	    continue;
+#endif
+	  break;
+	}
+      total_written += written;
+      ptr += written;
+      len -= written;
+    }
+  return total_written;
+}