Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/util/mask_addr.c b/src/util/mask_addr.c
new file mode 100644
index 0000000..5ddd0ca
--- /dev/null
+++ b/src/util/mask_addr.c
@@ -0,0 +1,68 @@
+/*++
+/* NAME
+/*	mask_addr 3
+/* SUMMARY
+/*	address bit banging
+/* SYNOPSIS
+/*	#include <mask_addr.h>
+/*
+/*	void	mask_addr(addr_bytes, addr_byte_count, network_bits)
+/*	unsigned char *addr_bytes;
+/*	unsigned addr_byte_count;
+/*	unsigned network_bits;
+/* DESCRIPTION
+/*	mask_addr() clears all the host bits in the specified
+/*	address.  The code can handle addresses of any length,
+/*	and bytes of any width.
+/*
+/*	Arguments:
+/* .IP addr_bytes
+/*	The network address in network byte order.
+/* .IP addr_byte_count
+/*	The network address length in bytes.
+/* .IP network_bits
+/*	The number of initial bits that will not be cleared.
+/* DIAGNOSTICS
+/*	Fatal errors: the number of network bits exceeds the address size.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <limits.h>			/* CHAR_BIT */
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mask_addr.h>
+
+/* mask_addr - mask off a variable-length address */
+
+void    mask_addr(unsigned char *addr_bytes,
+		          unsigned addr_byte_count,
+		          unsigned network_bits)
+{
+    unsigned char *p;
+
+    if (network_bits > addr_byte_count * CHAR_BIT)
+	msg_panic("mask_addr: address byte count %d too small for bit count %d",
+		  addr_byte_count, network_bits);
+
+    p = addr_bytes + network_bits / CHAR_BIT;
+    network_bits %= CHAR_BIT;
+
+    if (network_bits != 0)
+	*p++ &= ~0U << (CHAR_BIT - network_bits);
+
+    while (p < addr_bytes + addr_byte_count)
+	*p++ = 0;
+}