ShellPkg: Refine code to make catenae length more precise.

This commit refine the catenae length. A too long catenae length in StrnCat may cause potential buffer overflow while in StrnCatS it may ASSERT.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17747 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed