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-rw-r--r--src/vppinfra/string.c94
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diff --git a/src/vppinfra/string.c b/src/vppinfra/string.c
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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ Copyright (c) 2006 Eliot Dresselhaus
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <vppinfra/string.h>
+#include <vppinfra/error.h>
+
+/* Exchanges source and destination. */
+void
+clib_memswap (void *_a, void *_b, uword bytes)
+{
+ uword pa = pointer_to_uword (_a);
+ uword pb = pointer_to_uword (_b);
+
+#define _(TYPE) \
+ if (0 == ((pa | pb) & (sizeof (TYPE) - 1))) \
+ { \
+ TYPE * a = uword_to_pointer (pa, TYPE *); \
+ TYPE * b = uword_to_pointer (pb, TYPE *); \
+ \
+ while (bytes >= 2*sizeof (TYPE)) \
+ { \
+ TYPE a0, a1, b0, b1; \
+ bytes -= 2*sizeof (TYPE); \
+ a += 2; \
+ b += 2; \
+ a0 = a[-2]; a1 = a[-1]; \
+ b0 = b[-2]; b1 = b[-1]; \
+ a[-2] = b0; a[-1] = b1; \
+ b[-2] = a0; b[-1] = a1; \
+ } \
+ pa = pointer_to_uword (a); \
+ pb = pointer_to_uword (b); \
+ }
+
+ if (BITS (uword) == BITS (u64))
+ _(u64);
+ _(u32);
+ _(u16);
+ _(u8);
+
+#undef _
+
+ ASSERT (bytes < 2);
+ if (bytes)
+ {
+ u8 *a = uword_to_pointer (pa, u8 *);
+ u8 *b = uword_to_pointer (pb, u8 *);
+ u8 a0 = a[0], b0 = b[0];
+ a[0] = b0;
+ b[0] = a0;
+ }
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */