mtd-utils: new memory wrappers

The mkfs.jffs2 program has local wrappers for memory related functions
that are useful beyond mkfs.jffs2, so break them out into a common header.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/include/xalloc.h b/include/xalloc.h
new file mode 100644
index 0000000..5d145d9
--- /dev/null
+++ b/include/xalloc.h
@@ -0,0 +1,80 @@
+/*
+ * memory wrappers
+ *
+ * Copyright (c) Artem Bityutskiy, 2007, 2008
+ * Copyright 2001, 2002 Red Hat, Inc.
+ *           2001 David A. Schleef <ds@lineo.com>
+ *           2002 Axis Communications AB
+ *           2001, 2002 Erik Andersen <andersen@codepoet.org>
+ *           2004 University of Szeged, Hungary
+ *           2006 KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __MTD_UTILS_XALLOC_H__
+#define __MTD_UTILS_XALLOC_H__
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * Mark these functions as unused so that gcc does not emit warnings
+ * when people include this header but don't use every function.
+ */
+
+__attribute__((unused))
+static void *xmalloc(size_t size)
+{
+	void *ptr = malloc(size);
+
+	if (ptr == NULL && size != 0)
+		sys_errmsg_die("malloc(%zu) failed", size);
+	return ptr;
+}
+
+__attribute__((unused))
+static void *xcalloc(size_t nmemb, size_t size)
+{
+	void *ptr = calloc(nmemb, size);
+
+	if (ptr == NULL && nmemb != 0 && size != 0)
+		sys_errmsg_die("calloc(%zu, %zu) failed", nmemb, size);
+	return ptr;
+}
+
+__attribute__((unused))
+static void *xrealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL && size != 0)
+		sys_errmsg_die("realloc(%p, %zu) failed", ptr, size);
+	return ptr;
+}
+
+__attribute__((unused))
+static char *xstrdup(const char *s)
+{
+	char *t;
+
+	if (s == NULL)
+		return NULL;
+	t = strdup(s);
+	if (t == NULL)
+		sys_errmsg_die("strdup(%p) failed", s);
+	return t;
+}
+
+#endif /* !__MTD_UTILS_XALLOC_H__ */