common: Add additional memory utilities (xzalloc() etc.)

include/common/mem.h

@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __LABWC_MEM_H
+#define __LABWC_MEM_H
+
+#include <stdlib.h>
+
+/*
+ * As defined in busybox, weston, etc.
+ * Allocates zero-filled memory; calls exit() on error.
+ * Returns NULL only if (size == 0).
+ */
+void *xzalloc(size_t size);
+
+/*
+ * As defined in FreeBSD.
+ * Like realloc(), but calls exit() on error.
+ * Returns NULL only if (size == 0).
+ * Does NOT zero-fill memory.
+ */
+void *xrealloc(void *ptr, size_t size);
+
+/* malloc() is a specific case of realloc() */
+#define xmalloc(size) xrealloc(NULL, (size))
+
+/*
+ * As defined in FreeBSD.
+ * Allocates a copy of <str>; calls exit() on error.
+ * Requires (str != NULL) and never returns NULL.
+ */
+char *xstrdup(const char *str);
+
+/*
+ * Frees memory pointed to by <ptr> and sets <ptr> to NULL.
+ * Does nothing if <ptr> is already NULL.
+ */
+#define zfree(ptr) do { \
+        free(ptr); (ptr) = NULL; \
+} while (0)
+
+#endif /* __LABWC_MEM_H */

include/common/zfree.h

@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef __LABWC_ZFREE_H
-#define __LABWC_ZFREE_H
-
-void __zfree(void **ptr);
-
-#define zfree(ptr) __zfree((void **)&(ptr))
-
-#endif /* __LABWC_ZFREE_H */