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-rw-r--r--lib/sh/zcatfd.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/sh/zcatfd.c b/lib/sh/zcatfd.c
new file mode 100644
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--- /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;
+}