initial import

internal commit: 14ac2bc2299032fa6714d1fefa7cf0987b3e3085

Signed-off-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/lib/strcpy.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2018 Intel Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <hv_lib.h>
+#include <acrn_common.h>
+#include <hv_arch.h>
+#include <hv_debug.h>
+
+/**
+ *strcpy_s
+ *
+ * description:
+ *    This function copies the string pointed to by s to a buffer
+ *    pointed by d.
+ *
+ *
+ * input:
+ *    d	       pointer to dest buffer.
+ *
+ *    dmax     maximum length of dest buffer
+ *
+ *    s        pointer to the source string
+ *
+ * return value:
+ *    dest      pointer to dest string if string is copied
+ *              successfully,or else return null.
+ *
+ * notes:
+ *    1) both d and s shall not be null pointers.
+ *    2) dmax shall not 0.
+ */
+char *strcpy_s(char *d, size_t dmax, const char *s)
+{
+
+	char *dest_base;
+	size_t dest_avail;
+	uint64_t overlap_guard;
+
+	ASSERT(s != NULL, "invalid input s.");
+	ASSERT((d != NULL) && (dmax != 0), "invalid input d or dmax.");
+
+	if (s == d)
+		return d;
+
+	overlap_guard = (uint64_t)((d > s) ? (d - s - 1) : (s - d - 1));
+
+	dest_avail = dmax;
+	dest_base = d;
+
+	while (dest_avail > 0) {
+		ASSERT(overlap_guard != 0, "overlap happened.");
+
+		*d = *s;
+		if (*d == '\0')
+			return dest_base;
+
+		d++;
+		s++;
+		dest_avail--;
+		overlap_guard--;
+	}
+
+	ASSERT(false, "dest buffer has no enough space.");
+
+	/*
+	 * to avoid a string that is not
+	 * null-terminated in dest buffer
+	 */
+	dest_base[dmax - 1] = '\0';
+	return NULL;
+}