some libs done

lib/file.c

@@ -0,0 +1,22 @@
+#include "file.h"
+#include "e.h"
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+error_t write(char *path, char *format, ...) {
+  error_t err;
+  va_list args;
+  va_start(args, format);
+  FILE *fp;
+  fp = fopen(path, "w");
+  if (!fp) {
+    err.stat = errno;
+    err.src = strerror(errno);
+  }
+  vfprintf(fp, format, args);
+  fclose(fp);
+  va_end(args);
+  return err;
+}