From daad39345d707b8adccd421f4509de637c5643b0 Mon Sep 17 00:00:00 2001
From: Karol Babioch <karol@babioch.de>
Date: Fri, 4 May 2018 15:44:00 +0200
Subject: [PATCH] Make use of PATH_MAX for fullpath

Instead of hardcoding the buffer size to 256, using PATH_MAX makes more
sense here, since this can be defined differently on different
platforms. This is not perfect, though, refer to [1] for some details.
In our case it should be good enough.

[1]: https://eklitzke.org/path-max-is-tricky
---
 ykpamcfg.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ykpamcfg.c b/ykpamcfg.c
index d2ad7b5..fece317 100644
--- a/ykpamcfg.c
+++ b/ykpamcfg.c
@@ -39,6 +39,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#include <limits.h>
 
 #include <ykpers.h>
 
@@ -164,8 +165,8 @@ do_add_hmac_chalresp(YK_KEY *yk, uint8_t slot, bool verbose, char *output_dir, u
   */
   
   if (!output_dir){
-      char fullpath[256];
-      snprintf(fullpath, 256,"%s/.yubico",p->pw_dir);
+      char fullpath[PATH_MAX];
+      snprintf(fullpath, PATH_MAX, "%s/.yubico", p->pw_dir);
       
       //check if directory exists     
       if (stat(fullpath,&st)!=0 ){