tree bda352effc081a97888a3a899f90f1e75cce4628
parent 8c9befeaee7df8758a0584a7fdc988ab9afb14af
author Oliver Smith <osmith@sysmocom.de> 1559830292 +0200
committer Oliver Smith <osmith@sysmocom.de> 1559898111 +0200

gsm48_decode_bcd_number2: fix ENOSPC edge case

Return ENOSPC if the decoding buffer is one byte too small, instead of
returning 0 and silently truncating the string. Add a new "truncated"
variable to detect if the loop breaks in the final iteration.

The string is not truncated if there is exactly one 0xf ('\0') higher
nibble remaining. This is covered by the existing test case "long
15-digit (maximum) MSISDN, limited buffer".

Related: OS#4049
Change-Id: Ie05900aca50cc7fe8a45d17844dbfcd905fd82fe