1 files changed, 74 insertions, 0 deletions
diff --git a/lib/sh/zcatfd.c b/lib/sh/zcatfd.c
new file mode 100644
index 0000000..aa8199f
--- /dev/null
+++ b/lib/sh/zcatfd.c
@@ -0,0 +1,74 @@
+/* zcatfd - copy contents of file descriptor to another */
+
+/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#include <stdc.h>
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#ifndef ZBUFSIZ
+#  define ZBUFSIZ 4096
+#endif
+
+extern ssize_t zread PARAMS((int, char *, size_t));
+extern int zwrite PARAMS((int, char *, ssize_t));
+
+/* Dump contents of file descriptor FD to OFD.  FN is the filename for
+   error messages (not used right now). */
+int
+zcatfd (fd, ofd, fn)
+     int fd, ofd;
+     char *fn;
+{
+  ssize_t nr;
+  int rval;
+  char lbuf[ZBUFSIZ];
+
+  rval = 0;
+  while (1)
+    {
+      nr = zread (fd, lbuf, sizeof (lbuf));
+      if (nr == 0)
+	break;
+      else if (nr < 0)
+	{
+	  rval = -1;
+	  break;
+	}
+      else if (zwrite (ofd, lbuf, nr) < 0)
+	{
+	  rval = -1;
+	  break;
+	}
+    }
+
+  return rval;
+}