Add Windows support for C-API and Runtime API libraries and examples. (#379)

* Add Windows support for C-API and Runtime API libraries and examples.

Signed-off-by: Wu Zhongmin <vwzm@live.com>
Signed-off-by: Xiaokang Qin <xiaokang.qxk@antgroup.com>

* Address the review comments

Signed-off-by: Xiaokang Qin <xiaokang.qxk@antgroup.com>

* Rewrite the the bh_getopt to make it avaliable for more kinds of options

Signed-off-by: Wu Zhongmin <vwzm@live.com>
Signed-off-by: Xiaokang Qin <xiaokang.qxk@antgroup.com>

* Add the license header

Signed-off-by: Xiaokang Qin <xiaokang.qxk@antgroup.com>

Co-authored-by: Zhongmin Wu <vwzm@live.com>

core/shared/utils/uncommon/bh_getopt.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2020 Ant Financial Services Group. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef __GNUC__
+
+#include "bh_getopt.h"
+#include <string.h>
+
+char* optarg = NULL;
+int optind = 1;
+
+int getopt(int argc, char *const argv[], const char *optstring)
+{
+    static int sp = 1;
+    int c;
+    int opt;
+    char *p;
+
+    if (sp == 1) {
+        if ((optind >= argc) || (argv[optind][0] != '-') || (argv[optind][1] == 0)){
+            return -1;
+        } else if (!strcmp(argv[optind], "--")) {
+            optind++;
+            return -1;
+        }
+    }
+
+    opt = argv[optind][sp];
+    p = strchr(optstring, opt);
+    if (opt == ':' || p == NULL) {
+        printf("illegal option : '-%c'\n", opt);
+        if ( argv[optind][++sp] == '\0') {
+            optind ++;
+            sp = 1;
+        }
+        return ('?');
+    }
+    if (p[1]  == ':') {
+        if (argv[optind][sp + 1] != '\0')
+            optarg = &argv[optind++][sp + 1];
+        else if (++optind >= argc) {
+            printf("option '-%c' requires an argument :\n", opt);
+            sp = 1;
+            return ('?');
+        } else {
+            optarg = argv[optind++];
+        }
+        sp = 1;
+    } else {
+        if (argv[optind][++sp] == '\0') {
+            sp = 1;
+            optind++;
+        }
+        optarg = NULL;
+    }
+    return (opt);
+}
+#endif

core/shared/utils/uncommon/bh_getopt.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2020 Ant Financial Services Group. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifdef __GNUC__
+#include <getopt.h>
+#endif
+#ifndef __GNUC__
+#ifndef GETOPT_H__
+#define GETOPT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern char *optarg;
+extern int optind;
+
+int getopt(int argc, char *const argv[], const char *optstring);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of GETOPT_H__ */
+#endif /* end of __GNUC__ */