re-org bh_definition.c && introduce wamr fast interpreter (#189)

Co-authored-by: Xu Jun

core/shared/utils/bh_definition.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "bh_platform.h"
+#include "bh_common.h"
+
+#ifdef RSIZE_MAX
+#undef RSIZE_MAX
+#endif
+
+#define RSIZE_MAX 0x7FFFFFFF
+
+int
+b_memcpy_s(void * s1, unsigned int s1max,
+           const void * s2, unsigned int n)
+{
+  char *dest = (char*)s1;
+  char *src = (char*)s2;
+  if (n == 0) {
+    return 0;
+  }
+
+  if (s1 == NULL || s1max > RSIZE_MAX) {
+    return -1;
+  }
+  if (s2 == NULL || n > s1max) {
+    memset(dest, 0, s1max);
+    return -1;
+  }
+  memcpy(dest, src, n);
+  return 0;
+}
+
+int
+b_strcat_s(char * s1, size_t s1max, const char * s2)
+{
+  if (NULL == s1 || NULL == s2
+      || s1max < (strlen(s1) + strlen(s2) + 1)
+      || s1max > RSIZE_MAX) {
+    return -1;
+  }
+
+  memcpy(s1 + strlen(s1), s2, strlen(s2) + 1);
+  return 0;
+}
+
+int
+b_strcpy_s(char * s1, size_t s1max, const char * s2)
+{
+  if (NULL == s1 || NULL == s2
+      || s1max < (strlen(s2) + 1)
+      || s1max > RSIZE_MAX) {
+    return -1;
+  }
+
+  memcpy(s1, s2, strlen(s2) + 1);
+  return 0;
+}
+
+char *
+bh_strdup(const char *s)
+{
+    uint32 size;
+    char *s1 = NULL;
+
+    if (s) {
+        size = (uint32)(strlen(s) + 1);
+        if ((s1 = bh_malloc(size)))
+            bh_memcpy_s(s1, size, s, size);
+    }
+    return s1;
+}
+