utils: auto_fclose cleanup

lib/utils.c

@@ -23,6 +23,11 @@ void _cleanup_close(int *p)
     if (*p > 0) close(*p);
 }
 
+void _cleanup_fclose(FILE **p)
+{
+    if (*p) fclose(*p);
+}
+
 char* kr_strcatdup(unsigned n, ...)
 {
     /* Calculate total length */

lib/utils.h

@@ -16,6 +16,8 @@
 
 #pragma once
 
+#include <stdio.h>
+
 /*
  * General-purpose attributes.
  */
@@ -23,6 +25,8 @@
 extern void _cleanup_free(char **p);
 #define auto_close __attribute__((cleanup(_cleanup_close)))
 extern void _cleanup_close(int *p);
+#define auto_fclose __attribute__((cleanup(_cleanup_fclose)))
+extern void _cleanup_fclose(FILE **p);
 
 /*
  * Defines.