From f7af7bfcbf18011826beede7cd9e626af5f60765 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Wed, 17 Nov 2010 10:04:54 +0100
Subject: Add utils

---
 Makefile |  2 +-
 util.c   | 31 +++++++++++++++++++++++++++++++
 util.h   | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 util.c
 create mode 100644 util.h

diff --git a/Makefile b/Makefile
index 40a6460..049d114 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ P	= nios2sim-ng
 VERSION	= 0.1
 
 OBJS	= main.o image.o elf.o srec.o nios2.o memory.o instruction.o simulator.o \
-	  device.o uart.o jtag_uart.o
+	  device.o uart.o jtag_uart.o util.o
 #OBJS	+= load_image.o nor_flash.o simulator.o simulator.o niosii.o i_type_handler.o j_type_handler.o \
 #	   r_type_handler.o custom_instr.o timer.o
 
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..0ec10b9
--- /dev/null
+++ b/util.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * This file is part of nios2sim-ng.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "nios2sim-ng.h"
+#include "util.h"
+
+/**
+ * Allocate memory which is set to zero.
+ *
+ * @param size  requested size of memory in bytes
+ * @return      pointer to the allocated and zeroed memory on success, NULL on
+ *              error
+ */
+void *zalloc(const size_t size)
+{
+	void *ret = malloc(size);
+
+	if (likely(ret != NULL))
+		memset(ret, 0x00, size);
+	return ret;
+}
diff --git a/util.h b/util.h
new file mode 100644
index 0000000..92b9621
--- /dev/null
+++ b/util.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ *
+ * This file is part of nios2sim-ng.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _UTIL_H_
+#define _UTIL_H_
+
+#include <string.h>
+
+/*
+ * Memory allocation
+ */
+
+extern void *zalloc(const size_t size);
+
+/*
+ * String handling and manipulation
+ */
+
+/**
+ * Check whether two strings match exactly.
+ *
+ * @param ctx  the reference string (usually a defined constant or string under
+ *             the programs control)
+ * @param arg  the string to match against the reference string (usually the
+ *             user-supplied string)
+ * @return     true if the strings match
+ */
+static inline bool xstrmatch(const char *ctx, const char *arg)
+{
+	size_t len = strlen(ctx);
+	return (strlen(arg) == len && strncmp(arg, ctx, len) == 0);
+}
+
+/**
+ * Check whether a string is empty (either NULL or empty string).
+ *
+ * @param str  string to check for emptiness
+ * @return     true if the string is empty
+ */
+static inline bool xstrisempty(const char *str)
+{
+	return ((str == NULL) || (xstrmatch("", str)));
+}
+
+
+/*
+ * Stringification macro (taken from Linux Kernel source code)
+ */
+
+/* Indirect stringification.  Doing two levels allows the parameter to be a
+ * macro itself.  For example, compile with -DFOO=bar, __stringify(FOO)
+ * converts to "bar".
+ */
+
+#define __stringify_1(x...)	#x
+#define __stringify(x...)	__stringify_1(x)
+
+#endif /* _UTIL_H_ */
-- 
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