utils: add macro __LXC_NUMSTRLEN

This macro can be used to set or allocate a string buffer that can hold any 64bit representable number. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

utils: add macro __LXC_NUMSTRLEN
03fb1aaa · Christian Brauner · Stéphane Graber · b101fb9b · 03fb1aaa
Commit 03fb1aaa authored Nov 27, 2016 by Christian Brauner Committed by Stéphane Graber Nov 30, 2016
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utils.h src/lxc/utils.h +4 -0

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--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -35,6 +35,10 @@

 #include "initutils.h"

+/* Useful macros */
+/* Maximum number for 64 bit integer is a string with 21 digits: 2^64 - 1 = 21 */
+#define __LXC_NUMSTRLEN 21
+
 /* returns 1 on success, 0 if there were any failures */
 extern int lxc_rmdir_onedev(char *path, const char *exclude);
 extern int get_u16(unsigned short *val, const char *arg, int base);