File _service:obs_scm:helper-add-free_n-method-to-ha... of Package ipmitool

File _service:obs_scm:helper-add-free_n-method-to-handle-clearing-pointers.patch of Package ipmitool

From 8b6d127bb14b9ad7ef28da1fc5f8c965df2123cd Mon Sep 17 00:00:00 2001
From: Patrick Venture <venture@google.com>
Date: Wed, 5 Dec 2018 08:55:59 -0800
Subject: [PATCH 093/119] helper: add free_n method to handle clearing pointers

free_n() will free the memory and clear the pointer, which will reduce
the probability a developer will forget to clear the pointer after
freeing.

Resolves: #79

Signed-off-by: Patrick Venture <venture@google.com>
---
 include/ipmitool/helper.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/ipmitool/helper.h b/include/ipmitool/helper.h
index c53736f..c03c931 100644
--- a/include/ipmitool/helper.h
+++ b/include/ipmitool/helper.h
@@ -111,6 +111,17 @@ FILE * ipmi_open_file(const char * file, int rw);
 void ipmi_start_daemon(struct ipmi_intf *intf);
 uint16_t ipmi_get_oem_id(struct ipmi_intf *intf);
 
+/**
+ * Free the memory and clear the pointer.
+ * @param[in] ptr - a pointer to your pointer to free.
+ */
+static inline void free_n(void **ptr) {
+	if (ptr && *ptr) {
+		free(*ptr);
+		*ptr = NULL;
+	}
+}
+
 #define ipmi_open_file_read(file)	ipmi_open_file(file, 0)
 #define ipmi_open_file_write(file)	ipmi_open_file(file, 1)
 
-- 
2.19.1