refactorHEADmain

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
new file mode 100644
index 0000000..e6e691a
--- /dev/null
+++ b/lib/lib.c
@@ -0,0 +1,51 @@
+#include "lib.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((__noreturn__))
+static void die() {
+	exit(1);
+}
+
+void error_and_die(char *format, ...) {
+	va_list list;
+	va_start(list, format);
+
+	vfprintf(stderr, format, list);
+
+	die();
+}
+
+__attribute__((__noreturn__, format(printf, 1, 2)))
+void perror_and_die(char *format, ...) {
+	va_list list;
+	va_start(list, format);
+
+	vfprintf(stderr, format, list);
+	perror(": ");
+
+	die();
+}
+
+void *xalloc(size_t amount) {
+	void *res = malloc(amount);
+	if (res == NULL)
+		error_and_die("failed to allocate memory");
+	return res;
+}
+
+void *xzalloc(size_t amount) {
+	void *res = xalloc(amount);
+	memset(res, 0, sizeof(amount));
+	return res;
+}
+
+void *xrealloc(void *ptr, size_t amount) {
+	void *res = realloc(ptr, amount);
+	if (res == NULL)
+		error_and_die("failed to allocate memory");
+	return res;
+}