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

src/common/mem.c

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "common/mem.h"
+
+static void
+die_if_null(void *ptr)
+{
+	if (!ptr) {
+		perror("Failed to allocate memory");
+		exit(EXIT_FAILURE);
+	}
+}
+
+void *
+xzalloc(size_t size)
+{
+	if (!size) {
+		return NULL;
+	}
+	void *ptr = calloc(1, size);
+	die_if_null(ptr);
+	return ptr;
+}
+
+void *
+xrealloc(void *ptr, size_t size)
+{
+	if (!size) {
+		free(ptr);
+		return NULL;
+	}
+	ptr = realloc(ptr, size);
+	die_if_null(ptr);
+	return ptr;
+}
+
+char *
+xstrdup(const char *str)
+{
+	assert(str);
+	char *copy = strdup(str);
+	die_if_null(copy);
+	return copy;
+}