first commit for openGauss server

src/lib/pgcommon/fe_memutils.cpp

@@ -0,0 +1,104 @@
+/* ---------------------------------------------------------------------------------------
+ *
+ * fe_memutils.cpp
+ *	  memory management support for frontend code
+ *
+ * Portions Copyright (c) 2020 Huawei Technologies Co.,Ltd.
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/lib/pgcommon/fe_memutils.cpp
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+#include "common/fe_memutils.h"
+
+static inline void* pg_malloc_internal(size_t size, int flags)
+{
+    void* tmp = NULL;
+    errno_t rc = EOK;
+
+    /* Avoid unportable behavior of malloc(0) */
+    if (size == 0)
+        size = 1;
+    tmp = malloc(size);
+    if (tmp == NULL) {
+        if ((flags & MCXT_ALLOC_NO_OOM) == 0) {
+            fprintf(stderr, _("out of memory\n"));
+            exit(EXIT_FAILURE);
+        }
+        return NULL;
+    }
+
+    if ((flags & MCXT_ALLOC_ZERO) != 0) {
+        rc = memset_s(tmp, size, 0, size);
+        securec_check_ss_c(rc, "\0", "\0");
+    }
+    return tmp;
+}
+
+void* pg_malloc(size_t size)
+{
+    return pg_malloc_internal(size, 0);
+}
+
+void* pg_realloc(void* ptr, size_t size)
+{
+    void* tmp = NULL;
+
+    /* Avoid unportable behavior of realloc(NULL, 0) */
+    if (ptr == NULL && size == 0)
+        size = 1;
+    tmp = realloc(ptr, size);
+    if (NULL == tmp) {
+        fprintf(stderr, _("out of memory\n"));
+        exit(EXIT_FAILURE);
+    }
+    return tmp;
+}
+
+/*
+ * "Safe" wrapper around strdup().
+ */
+char* pg_strdup(const char* in)
+{
+    char* tmp = NULL;
+
+    if (NULL == in) {
+        fprintf(stderr, _("cannot duplicate null pointer (internal error)\n"));
+        exit(EXIT_FAILURE);
+    }
+    tmp = strdup(in);
+    if (NULL == tmp) {
+        fprintf(stderr, _("out of memory\n"));
+        exit(EXIT_FAILURE);
+    }
+    return tmp;
+}
+
+void pg_free(void* ptr)
+{
+    if (ptr != NULL) {
+        free(ptr);
+        ptr = NULL;
+    }
+}
+
+void* palloc_extended(Size size, int flags)
+{
+    return pg_malloc_internal(size, flags);
+}
+
+void* palloc(Size size)
+{
+    return pg_malloc_internal(size, 0);
+}
+
+void pfree(void* pointer)
+{
+    pg_free(pointer);
+}