opt: optimize project struct

src/common/mem.h

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Based on labwc (https://github.com/labwc/labwc) */
+#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);
+
+/*
+ * Type-safe macros in the style of C++ new/new[].
+ * Both allocate zero-filled memory for object(s) the same size as
+ * <expr>, which may be either a type name or value expression.
+ *
+ * znew() allocates space for one object.
+ * znew_n() allocates space for an array of <n> objects.
+ *
+ * Examples:
+ *   struct wlr_box *box = znew(*box);
+ *   char *buf = znew_n(char, 80);
+ */
+#define znew(expr)       ((__typeof__(expr) *)xzalloc(sizeof(expr)))
+#define znew_n(expr, n)  ((__typeof__(expr) *)xzalloc((n) * sizeof(expr)))
+
+/*
+ * 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);
+
+/*
+ * Same as ptr = xstrdup(str) but free
+ * <ptr> before assigning the result.
+ */
+#define xstrdup_replace(ptr, str) do { \
+	free(ptr); (ptr) = xstrdup(str); \
+} while (0)
+
+/*
+ * 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 */