1 files changed, 176 insertions, 0 deletions
diff --git a/src/common/fe_memutils.c b/src/common/fe_memutils.c
new file mode 100644
index 0000000..b027a02
--- /dev/null
+++ b/src/common/fe_memutils.c
@@ -0,0 +1,176 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe_memutils.c
+ *	  memory management support for frontend code
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/common/fe_memutils.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#error "This file is not expected to be compiled for backend code"
+#endif
+
+#include "postgres_fe.h"
+
+static inline void *
+pg_malloc_internal(size_t size, int flags)
+{
+	void	   *tmp;
+
+	/* 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)
+		MemSet(tmp, 0, size);
+	return tmp;
+}
+
+void *
+pg_malloc(size_t size)
+{
+	return pg_malloc_internal(size, 0);
+}
+
+void *
+pg_malloc0(size_t size)
+{
+	return pg_malloc_internal(size, MCXT_ALLOC_ZERO);
+}
+
+void *
+pg_malloc_extended(size_t size, int flags)
+{
+	return pg_malloc_internal(size, flags);
+}
+
+void *
+pg_realloc(void *ptr, size_t size)
+{
+	void	   *tmp;
+
+	/* Avoid unportable behavior of realloc(NULL, 0) */
+	if (ptr == NULL && size == 0)
+		size = 1;
+	tmp = realloc(ptr, size);
+	if (!tmp)
+	{
+		fprintf(stderr, _("out of memory\n"));
+		exit(EXIT_FAILURE);
+	}
+	return tmp;
+}
+
+/*
+ * "Safe" wrapper around strdup().
+ */
+char *
+pg_strdup(const char *in)
+{
+	char	   *tmp;
+
+	if (!in)
+	{
+		fprintf(stderr,
+				_("cannot duplicate null pointer (internal error)\n"));
+		exit(EXIT_FAILURE);
+	}
+	tmp = strdup(in);
+	if (!tmp)
+	{
+		fprintf(stderr, _("out of memory\n"));
+		exit(EXIT_FAILURE);
+	}
+	return tmp;
+}
+
+void
+pg_free(void *ptr)
+{
+	if (ptr != NULL)
+		free(ptr);
+}
+
+/*
+ * Frontend emulation of backend memory management functions.  Useful for
+ * programs that compile backend files.
+ */
+void *
+palloc(Size size)
+{
+	return pg_malloc_internal(size, 0);
+}
+
+void *
+palloc0(Size size)
+{
+	return pg_malloc_internal(size, MCXT_ALLOC_ZERO);
+}
+
+void *
+palloc_extended(Size size, int flags)
+{
+	return pg_malloc_internal(size, flags);
+}
+
+void
+pfree(void *pointer)
+{
+	pg_free(pointer);
+}
+
+char *
+pstrdup(const char *in)
+{
+	return pg_strdup(in);
+}
+
+char *
+pnstrdup(const char *in, Size size)
+{
+	char	   *tmp;
+	int			len;
+
+	if (!in)
+	{
+		fprintf(stderr,
+				_("cannot duplicate null pointer (internal error)\n"));
+		exit(EXIT_FAILURE);
+	}
+
+	len = strnlen(in, size);
+	tmp = malloc(len + 1);
+	if (tmp == NULL)
+	{
+		fprintf(stderr, _("out of memory\n"));
+		exit(EXIT_FAILURE);
+	}
+
+	memcpy(tmp, in, len);
+	tmp[len] = '\0';
+
+	return tmp;
+}
+
+void *
+repalloc(void *pointer, Size size)
+{
+	return pg_realloc(pointer, size);
+}