patch-2.4.20 linux-2.4.20/arch/x86_64/lib/old-checksum.c

• Lines: 34
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/arch/x86_64/lib/old-checksum.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/x86_64/lib/old-checksum.c linux-2.4.20/arch/x86_64/lib/old-checksum.c
@@ -0,0 +1,33 @@
+/*
+ * Temporal C versions of the checksum functions until optimized assembler versions
+ * can go in.
+ */
+
+#include <net/checksum.h>
+
+/*
+ * Copy from userspace and compute checksum.  If we catch an exception
+ * then zero the rest of the buffer.
+ */
+unsigned int csum_partial_copy_from_user (const char *src, char *dst,
+                                          int len, unsigned int sum,
+                                          int *err_ptr)
+{
+	int missing;
+
+	missing = copy_from_user(dst, src, len);
+	if (missing) {
+		memset(dst + len - missing, 0, missing);
+		*err_ptr = -EFAULT;
+	}
+		
+	return csum_partial(dst, len, sum);
+}
+
+unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum)
+{
+	memcpy(dst,src,len);
+	return csum_partial(dst,len,sum);
+}
+
+/* Fallback for csum_and_copy_to_user is currently in include/net/checksum.h */