init commit

util.c

@@ -0,0 +1,47 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void *
+xmalloc(size_t sz)
+{
+	void *res;
+	res = malloc(sz);
+	if (sz != 0 && res == NULL) {
+		perror("malloc()");
+		exit(EXIT_FAILURE);
+	}
+	return res;
+
+}
+
+void*
+xrealloc(void *ptr, size_t size)
+{
+	void *res;
+
+	res = realloc(ptr, size);
+	if (size != 0 && res == NULL) {
+		perror("realloc()");
+		exit(EXIT_FAILURE);
+	}
+
+	return res;
+}
+
+void
+xfree(void *ptr)
+{
+	if (ptr)
+		free(ptr);
+}
+
+void
+xerror(int rc, char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+
+	exit(rc);
+}